# Thunder Mountain Gold Advances Ag-Au-Cu-Pb-Zn Massive Sulfide Resource Expansion Targets at South Mountain Canonical Atlas analysis: https://atlas-staging.minestarters.com/news/thunder-mountain-gold-advances-ag-au-cu-pb-zn-massive-sulfide-resource-expansion--da3cdd1a-bf1d-4d62-a181-c7b678a527a6 Original source: https://money.tmx.com/en/quote/THM/news/8548636407597328/thunder-mountain-gold-advances-ag-au-cu-pb-zn-massive-sulfide-resource-expansion Publisher: tmx Original announcement: 2026-09-17T11:00:00.000Z Analysis by Minestarters Atlas Atlas analysis published: 2026-09-22T22:22:28.744Z Atlas analysis updated: 2026-09-22T22:22:28.744Z - Company: Thunder Mountain Gold - Ticker: THM - Exchange: TSX - Region: southern Idaho - Primary commodity: Zinc - Secondary commodities: Silver, Gold, Copper, Lead - Document categories: Drill results - Extracted: 2026-09-22 22:22:29 UTC Narrative sentiment: 0.80 · Bullish ## Minestarters Atlas summary Thunder Mountain Gold reports successful initial drill results from its 2026 exploration program at the South Mountain Project in Idaho, confirming near-resource expansion potential and identifying new massive sulfide mineralization. Key intercepts include high-grade silver and zinc, with associated gold, copper, and lead, and estimated true widths. The company anticipates a significant improvement in understanding the resource size and scale as more assays are pending. Reasoning: Thunder Mountain Gold's initial 2026 drill results at South Mountain are highly positive, confirming significant polymetallic mineralization with high-grade silver and zinc intercepts, expanding the known resource footprint, and identifying new zones. The program benefits from robust QA/QC and QP oversight, although the full impact awaits pending assays. - Positive factor: High-grade polymetallic intercepts, particularly for silver and zinc. - Positive factor: Confirmation of near-resource expansion potential in previously undrilled areas. - Positive factor: Identification of new massive sulfide mineralization at the Kentucky target, extending continuity. - Positive factor: True width estimated for reported intercepts, providing better geological context. - Positive factor: Comprehensive QA/QC procedures disclosed, including standards, duplicates, and blanks. - Positive factor: Technical information reviewed and approved by a Qualified Person \(QP\) under S-K 1300 and NI 43-101 standards. - Negative factor: Many assays are still pending, meaning the full scope of the program's success is not yet known. - Negative factor: Cut-off grades for compositing are not explicitly disclosed. Low confidence — this extraction should be reviewed alongside the original source. Facts used in scoring: 65 ## Classification and evidence **Bonanza Intercept** Polarity: positive Definition: Exceptionally high-grade zone, well above the deposit-type norm. Why it applies: The intercept in hole SM26-057 from 40.23m to 42.34m returned 451 g/t Ag, which is well above the exceptional threshold for silver. Evidence · table > 451 Context: 2.11 **True Width Disclosed** Polarity: positive Definition: Actual thickness perpendicular to structure is stated, not just downhole length. Why it applies: The drill results table includes an '\*Est. True width \(m\)' column, indicating that true widths have been estimated for the reported intercepts. Evidence · table > \*Est. True width \(m\) Context: Interval \(m\) **Step-Out Extension** Polarity: positive Definition: Mineralization extended beyond the previously known limit. Why it applies: The document explicitly states 'Three step-out holes demonstrated approximately 80 meters of down-plunge continuity' at the Kentucky target. Evidence · text > Three step-out holes demonstrated approximately 80 meters of down-plunge continuity **QA/QC Disclosed** Polarity: positive Definition: Release includes QA/QC disclosure — certified lab, QP sign-off, or stated methods \(blanks, standards, duplicates\). Why it applies: The release details QA/QC procedures, including the insertion of certified standard reference materials, duplicates, and blanks, and mentions assay by MSA Labs. Evidence · text > Quality control was monitored by the insertion of numerous blind certified standard reference materials, duplicates, and blanks into each sample shipment. **QP/CP Signed** Polarity: positive Story-specific tag Definition: Qualified Person \(QP\) or Competent Person \(CP\) named and signed off — a member of a recognized professional association \(e.g., AusIMM, SME, AIG, P.Geo\) with relevant experience. Why it applies: The technical information was reviewed and approved by Steven A. Osterberg, Ph.D., P.G., Q.P. consulting geologist, who is a 'Qualified Person' as defined by U.S. S-K 1300 and NI 43-101 standards. Evidence · text > The technical information in this news release was reviewed and approved by Steven A. Osterberg, Ph.D., P.G., Q.P. consulting geologist, and is a "Qualified Person" as defined by the U.S. S-K 1300 regulations and National Instrument 43-101 standards. **Infill Drilling** Polarity: neutral Definition: Confirmatory drilling to raise resource confidence, not new discovery. Why it applies: The 8,500-foot diamond core program was designed to 'expand the established carbonate replacement deposit \(CRD\) massive sulfide resource', indicating infill or extension drilling. Evidence · text > The Company's 8,500-foot diamond core program was designed to expand the established carbonate replacement deposit \(CRD\) massive sulfide resource **Cut-off Undisclosed** Polarity: negative Definition: High-grade interval reported without stating the cut-off grade used for compositing. Why it applies: The document does not explicitly state the cut-off grade used for reporting the drill intercepts. Evidence · text > Initial Assay Results from 2026 Drilling ## Extracted facts Stored fact records: 65. Some facts used in scoring do not have a stored record. ## Drill Results (65) ### SM26-055 [Link to this fact](https://atlas-staging.minestarters.com/news/thunder-mountain-gold-advances-ag-au-cu-pb-zn-massive-sulfide-resource-expansion--da3cdd1a-bf1d-4d62-a181-c7b678a527a6#fact-drill-facts-0) South Mountain · silver #### Identity - Hole ID: SM26-055 - Project: South Mountain - Commodity: silver - Region: usa\_id - Reported Region: usa\_id - Ticker: THM #### Geometry - Grade: 52 - Grade Unit: g/t - Intercept: 7.4 m - True Width: 49.56 m - From: 55.69 m - To: 63.09 m - Hole Depth: 133 m - Intercept Depth: 55.69 m #### Classification - Deposit Type: other - Program: mixed - Sample Type: drill - Group ID: SM26-055:55.69-63.09 - Mining Method: unknown #### Location - Easting: 507036 - Northing: 4732144 - CRS: WGS84 \(meters\) - Azimuth: 335 ° - Dip: -45 ° - Loc. Confidence: high - Loc. Source: document #### QA/QC - Laboratory: MSA Labs - QA/QC Disclosed: Yes - QP Signed: Yes - QA/QC Methods: standards, blanks, duplicates #### Review - Needs Review: No - Interp. Status: scored - Historical: No #### Dates - Event date: 2026-09-17T00:00:00.000Z Reasoning: This intercept shows a good silver grade with a significant estimated true width, contributing to the resource expansion efforts. - Positive factor: Good silver grade for an exploration intercept. - Positive factor: True width estimated, providing better context. - Positive factor: Part of a program expanding known mineralization. Evidence · table > 52 Context: 7.40 #### Tags used in scoring **True Width Disclosed** Polarity: positive Definition: Actual thickness perpendicular to structure is stated, not just downhole length. Why it applies: true\_width\_m is 49.56 **QA/QC Disclosed** Polarity: positive Definition: Release includes QA/QC disclosure — certified lab, QP sign-off, or stated methods \(blanks, standards, duplicates\). Why it applies: qaqc\_disclosed is true **Cut-off Undisclosed** Polarity: negative Definition: High-grade interval reported without stating the cut-off grade used for compositing. Why it applies: no cutoff\_grade was stated **Infill Drilling** Polarity: neutral Definition: Confirmatory drilling to raise resource confidence, not new discovery. Why it applies: drill\_program\_type is "mixed" **Nearology Play** Polarity: neutral Definition: Value premise rests on proximity to a known deposit rather than own results. Why it applies: proximity is offered as the value premise: "The Company's expanded land position now totals approximately 13,061 acres, or roughly twenty square miles, following th" ### SM26-055 [Link to this fact](https://atlas-staging.minestarters.com/news/thunder-mountain-gold-advances-ag-au-cu-pb-zn-massive-sulfide-resource-expansion--da3cdd1a-bf1d-4d62-a181-c7b678a527a6#fact-drill-facts-1) South Mountain · gold #### Identity - Hole ID: SM26-055 - Project: South Mountain - Commodity: gold - Region: usa\_id - Reported Region: usa\_id - Ticker: THM #### Geometry - Grade: 0.299 - Grade Unit: g/t - Intercept: 7.4 m - True Width: 49.56 m - From: 55.69 m - To: 63.09 m - Hole Depth: 133 m - Intercept Depth: 55.69 m #### Classification - Deposit Type: other - Program: mixed - Sample Type: drill - Group ID: SM26-055:55.69-63.09 - Mining Method: unknown #### Location - Easting: 507036 - Northing: 4732144 - CRS: WGS84 \(meters\) - Azimuth: 335 ° - Dip: -45 ° - Loc. Confidence: high - Loc. Source: document #### QA/QC - Laboratory: MSA Labs - QA/QC Disclosed: Yes - QP Signed: Yes - QA/QC Methods: standards, blanks, duplicates #### Review - Needs Review: No - Interp. Status: scored - Historical: No #### Dates - Event date: 2026-09-17T00:00:00.000Z Reasoning: This gold grade is moderate but contributes to the overall polymetallic nature of the intercept. - Positive factor: Associated gold mineralization adds value to the polymetallic intercept. - Positive factor: True width estimated, providing better context. Evidence · table > 0.299 Context: 7.40 #### Tags used in scoring **True Width Disclosed** Polarity: positive Definition: Actual thickness perpendicular to structure is stated, not just downhole length. Why it applies: true\_width\_m is 49.56 **QA/QC Disclosed** Polarity: positive Definition: Release includes QA/QC disclosure — certified lab, QP sign-off, or stated methods \(blanks, standards, duplicates\). Why it applies: qaqc\_disclosed is true **Cut-off Undisclosed** Polarity: negative Definition: High-grade interval reported without stating the cut-off grade used for compositing. Why it applies: no cutoff\_grade was stated **Infill Drilling** Polarity: neutral Definition: Confirmatory drilling to raise resource confidence, not new discovery. Why it applies: drill\_program\_type is "mixed" **Nearology Play** Polarity: neutral Definition: Value premise rests on proximity to a known deposit rather than own results. Why it applies: proximity is offered as the value premise: "The Company's expanded land position now totals approximately 13,061 acres, or roughly twenty square miles, following th" ### SM26-055 [Link to this fact](https://atlas-staging.minestarters.com/news/thunder-mountain-gold-advances-ag-au-cu-pb-zn-massive-sulfide-resource-expansion--da3cdd1a-bf1d-4d62-a181-c7b678a527a6#fact-drill-facts-2) South Mountain · copper #### Identity - Hole ID: SM26-055 - Project: South Mountain - Commodity: copper - Region: usa\_id - Reported Region: usa\_id - Ticker: THM #### Geometry - Grade: 0.0308 - Grade Unit: % - Intercept: 7.4 m - True Width: 49.56 m - From: 55.69 m - To: 63.09 m - Hole Depth: 133 m - Intercept Depth: 55.69 m #### Classification - Deposit Type: other - Program: mixed - Sample Type: drill - Group ID: SM26-055:55.69-63.09 - Mining Method: unknown #### Location - Easting: 507036 - Northing: 4732144 - CRS: WGS84 \(meters\) - Azimuth: 335 ° - Dip: -45 ° - Loc. Confidence: high - Loc. Source: document #### QA/QC - Laboratory: MSA Labs - QA/QC Disclosed: Yes - QP Signed: Yes - QA/QC Methods: standards, blanks, duplicates #### Review - Needs Review: No - Interp. Status: scored - Historical: No #### Dates - Event date: 2026-09-17T00:00:00.000Z Reasoning: The copper grade is very low, but its presence supports the polymetallic nature of the mineralization. - Positive factor: Presence of copper contributes to the polymetallic nature of the deposit. - Negative factor: Copper grade is very low \(308 ppm\). Evidence · table > 308 ppm Context: 7.40 #### Tags used in scoring **True Width Disclosed** Polarity: positive Definition: Actual thickness perpendicular to structure is stated, not just downhole length. Why it applies: true\_width\_m is 49.56 **QA/QC Disclosed** Polarity: positive Definition: Release includes QA/QC disclosure — certified lab, QP sign-off, or stated methods \(blanks, standards, duplicates\). Why it applies: qaqc\_disclosed is true **Cut-off Undisclosed** Polarity: negative Definition: High-grade interval reported without stating the cut-off grade used for compositing. Why it applies: no cutoff\_grade was stated **Infill Drilling** Polarity: neutral Definition: Confirmatory drilling to raise resource confidence, not new discovery. Why it applies: drill\_program\_type is "mixed" **Nearology Play** Polarity: neutral Definition: Value premise rests on proximity to a known deposit rather than own results. Why it applies: proximity is offered as the value premise: "The Company's expanded land position now totals approximately 13,061 acres, or roughly twenty square miles, following th" ### SM26-055 [Link to this fact](https://atlas-staging.minestarters.com/news/thunder-mountain-gold-advances-ag-au-cu-pb-zn-massive-sulfide-resource-expansion--da3cdd1a-bf1d-4d62-a181-c7b678a527a6#fact-drill-facts-3) South Mountain · lead #### Identity - Hole ID: SM26-055 - Project: South Mountain - Commodity: lead - Region: usa\_id - Reported Region: usa\_id - Ticker: THM #### Geometry - Grade: 0.0506 - Grade Unit: % - Intercept: 7.4 m - True Width: 49.56 m - From: 55.69 m - To: 63.09 m - Hole Depth: 133 m - Intercept Depth: 55.69 m #### Classification - Deposit Type: other - Program: mixed - Sample Type: drill - Group ID: SM26-055:55.69-63.09 - Mining Method: unknown #### Location - Easting: 507036 - Northing: 4732144 - CRS: WGS84 \(meters\) - Azimuth: 335 ° - Dip: -45 ° - Loc. Confidence: high - Loc. Source: document #### QA/QC - Laboratory: MSA Labs - QA/QC Disclosed: Yes - QP Signed: Yes - QA/QC Methods: standards, blanks, duplicates #### Review - Needs Review: No - Interp. Status: scored - Historical: No #### Dates - Event date: 2026-09-17T00:00:00.000Z Reasoning: The lead grade is very low, but its presence supports the polymetallic nature of the mineralization. - Positive factor: Presence of lead contributes to the polymetallic nature of the deposit. - Negative factor: Lead grade is very low \(506 ppm\). Evidence · table > 506 ppm Context: 7.40 #### Tags used in scoring **True Width Disclosed** Polarity: positive Definition: Actual thickness perpendicular to structure is stated, not just downhole length. Why it applies: true\_width\_m is 49.56 **QA/QC Disclosed** Polarity: positive Definition: Release includes QA/QC disclosure — certified lab, QP sign-off, or stated methods \(blanks, standards, duplicates\). Why it applies: qaqc\_disclosed is true **Cut-off Undisclosed** Polarity: negative Definition: High-grade interval reported without stating the cut-off grade used for compositing. Why it applies: no cutoff\_grade was stated **Infill Drilling** Polarity: neutral Definition: Confirmatory drilling to raise resource confidence, not new discovery. Why it applies: drill\_program\_type is "mixed" **Nearology Play** Polarity: neutral Definition: Value premise rests on proximity to a known deposit rather than own results. Why it applies: proximity is offered as the value premise: "The Company's expanded land position now totals approximately 13,061 acres, or roughly twenty square miles, following th" ### SM26-055 [Link to this fact](https://atlas-staging.minestarters.com/news/thunder-mountain-gold-advances-ag-au-cu-pb-zn-massive-sulfide-resource-expansion--da3cdd1a-bf1d-4d62-a181-c7b678a527a6#fact-drill-facts-4) South Mountain · zinc #### Identity - Hole ID: SM26-055 - Project: South Mountain - Commodity: zinc - Region: usa\_id - Reported Region: usa\_id - Ticker: THM #### Geometry - Grade: 0.22 - Grade Unit: % - Intercept: 7.4 m - True Width: 49.56 m - From: 55.69 m - To: 63.09 m - Hole Depth: 133 m - Intercept Depth: 55.69 m #### Classification - Deposit Type: other - Program: mixed - Sample Type: drill - Group ID: SM26-055:55.69-63.09 - Mining Method: unknown #### Location - Easting: 507036 - Northing: 4732144 - CRS: WGS84 \(meters\) - Azimuth: 335 ° - Dip: -45 ° - Loc. Confidence: high - Loc. Source: document #### QA/QC - Laboratory: MSA Labs - QA/QC Disclosed: Yes - QP Signed: Yes - QA/QC Methods: standards, blanks, duplicates #### Review - Needs Review: No - Interp. Status: scored - Historical: No #### Dates - Event date: 2026-09-17T00:00:00.000Z Reasoning: The zinc grade is moderate but contributes to the overall polymetallic nature of the intercept. - Positive factor: Presence of zinc contributes to the polymetallic nature of the deposit. Evidence · table > 0.22% Context: 7.40 #### Tags used in scoring **True Width Disclosed** Polarity: positive Definition: Actual thickness perpendicular to structure is stated, not just downhole length. Why it applies: true\_width\_m is 49.56 **QA/QC Disclosed** Polarity: positive Definition: Release includes QA/QC disclosure — certified lab, QP sign-off, or stated methods \(blanks, standards, duplicates\). Why it applies: qaqc\_disclosed is true **Cut-off Undisclosed** Polarity: negative Definition: High-grade interval reported without stating the cut-off grade used for compositing. Why it applies: no cutoff\_grade was stated **Infill Drilling** Polarity: neutral Definition: Confirmatory drilling to raise resource confidence, not new discovery. Why it applies: drill\_program\_type is "mixed" **Nearology Play** Polarity: neutral Definition: Value premise rests on proximity to a known deposit rather than own results. Why it applies: proximity is offered as the value premise: "The Company's expanded land position now totals approximately 13,061 acres, or roughly twenty square miles, following th" ### SM26-055 [Link to this fact](https://atlas-staging.minestarters.com/news/thunder-mountain-gold-advances-ag-au-cu-pb-zn-massive-sulfide-resource-expansion--da3cdd1a-bf1d-4d62-a181-c7b678a527a6#fact-drill-facts-5) South Mountain · silver #### Identity - Hole ID: SM26-055 - Project: South Mountain - Commodity: silver - Region: usa\_id - Reported Region: usa\_id - Ticker: THM #### Geometry - Grade: 86 - Grade Unit: g/t - Intercept: 22.47 m - True Width: 20 m - From: 98.66 m - To: 121.13 m - Hole Depth: 133 m - Intercept Depth: 55.69 m #### Classification - Deposit Type: other - Program: mixed - Sample Type: drill - Group ID: SM26-055:98.66-121.13 - Mining Method: unknown #### Location - Easting: 507036 - Northing: 4732144 - CRS: WGS84 \(meters\) - Azimuth: 335 ° - Dip: -45 ° - Loc. Confidence: high - Loc. Source: document #### QA/QC - Laboratory: MSA Labs - QA/QC Disclosed: Yes - QP Signed: Yes - QA/QC Methods: standards, blanks, duplicates #### Review - Needs Review: No - Interp. Status: scored - Historical: No #### Dates - Event date: 2026-09-17T00:00:00.000Z Reasoning: This broad intercept with a strong silver grade and significant true width is a material positive result for resource expansion. - Positive factor: Strong silver grade over a broad interval. - Positive factor: Significant estimated true width. - Positive factor: Part of a program expanding known mineralization. Evidence · table > 86 Context: 22.47 #### Tags used in scoring **True Width Disclosed** Polarity: positive Definition: Actual thickness perpendicular to structure is stated, not just downhole length. Why it applies: true\_width\_m is 20 **QA/QC Disclosed** Polarity: positive Definition: Release includes QA/QC disclosure — certified lab, QP sign-off, or stated methods \(blanks, standards, duplicates\). Why it applies: qaqc\_disclosed is true **Cut-off Undisclosed** Polarity: negative Definition: High-grade interval reported without stating the cut-off grade used for compositing. Why it applies: no cutoff\_grade was stated **Infill Drilling** Polarity: neutral Definition: Confirmatory drilling to raise resource confidence, not new discovery. Why it applies: drill\_program\_type is "mixed" **Nearology Play** Polarity: neutral Definition: Value premise rests on proximity to a known deposit rather than own results. Why it applies: proximity is offered as the value premise: "The Company's expanded land position now totals approximately 13,061 acres, or roughly twenty square miles, following th" ### SM26-055 [Link to this fact](https://atlas-staging.minestarters.com/news/thunder-mountain-gold-advances-ag-au-cu-pb-zn-massive-sulfide-resource-expansion--da3cdd1a-bf1d-4d62-a181-c7b678a527a6#fact-drill-facts-6) South Mountain · gold #### Identity - Hole ID: SM26-055 - Project: South Mountain - Commodity: gold - Region: usa\_id - Reported Region: usa\_id - Ticker: THM #### Geometry - Grade: 0.105 - Grade Unit: g/t - Intercept: 22.47 m - True Width: 20 m - From: 98.66 m - To: 121.13 m - Hole Depth: 133 m - Intercept Depth: 55.69 m #### Classification - Deposit Type: other - Program: mixed - Sample Type: drill - Group ID: SM26-055:98.66-121.13 - Mining Method: unknown #### Location - Easting: 507036 - Northing: 4732144 - CRS: WGS84 \(meters\) - Azimuth: 335 ° - Dip: -45 ° - Loc. Confidence: high - Loc. Source: document #### QA/QC - Laboratory: MSA Labs - QA/QC Disclosed: Yes - QP Signed: Yes - QA/QC Methods: standards, blanks, duplicates #### Review - Needs Review: No - Interp. Status: scored - Historical: No #### Dates - Event date: 2026-09-17T00:00:00.000Z Reasoning: The gold grade is low but contributes to the overall polymetallic nature of the broad intercept. - Positive factor: Associated gold mineralization adds value to the polymetallic intercept. Evidence · table > 0.105 Context: 22.47 #### Tags used in scoring **True Width Disclosed** Polarity: positive Definition: Actual thickness perpendicular to structure is stated, not just downhole length. Why it applies: true\_width\_m is 20 **QA/QC Disclosed** Polarity: positive Definition: Release includes QA/QC disclosure — certified lab, QP sign-off, or stated methods \(blanks, standards, duplicates\). Why it applies: qaqc\_disclosed is true **Cut-off Undisclosed** Polarity: negative Definition: High-grade interval reported without stating the cut-off grade used for compositing. Why it applies: no cutoff\_grade was stated **Infill Drilling** Polarity: neutral Definition: Confirmatory drilling to raise resource confidence, not new discovery. Why it applies: drill\_program\_type is "mixed" **Nearology Play** Polarity: neutral Definition: Value premise rests on proximity to a known deposit rather than own results. Why it applies: proximity is offered as the value premise: "The Company's expanded land position now totals approximately 13,061 acres, or roughly twenty square miles, following th" ### SM26-055 [Link to this fact](https://atlas-staging.minestarters.com/news/thunder-mountain-gold-advances-ag-au-cu-pb-zn-massive-sulfide-resource-expansion--da3cdd1a-bf1d-4d62-a181-c7b678a527a6#fact-drill-facts-7) South Mountain · copper #### Identity - Hole ID: SM26-055 - Project: South Mountain - Commodity: copper - Region: usa\_id - Reported Region: usa\_id - Ticker: THM #### Geometry - Grade: 0.36 - Grade Unit: % - Intercept: 22.47 m - True Width: 20 m - From: 98.66 m - To: 121.13 m - Hole Depth: 133 m - Intercept Depth: 55.69 m #### Classification - Deposit Type: other - Program: mixed - Sample Type: drill - Group ID: SM26-055:98.66-121.13 - Mining Method: unknown #### Location - Easting: 507036 - Northing: 4732144 - CRS: WGS84 \(meters\) - Azimuth: 335 ° - Dip: -45 ° - Loc. Confidence: high - Loc. Source: document #### QA/QC - Laboratory: MSA Labs - QA/QC Disclosed: Yes - QP Signed: Yes - QA/QC Methods: standards, blanks, duplicates #### Review - Needs Review: No - Interp. Status: scored - Historical: No #### Dates - Event date: 2026-09-17T00:00:00.000Z Reasoning: The copper grade is moderate and contributes to the overall polymetallic nature of the broad intercept. - Positive factor: Moderate copper grade for a broad polymetallic intercept. - Positive factor: True width estimated, providing better context. Evidence · table > 0.36 % Context: 22.47 #### Tags used in scoring **True Width Disclosed** Polarity: positive Definition: Actual thickness perpendicular to structure is stated, not just downhole length. Why it applies: true\_width\_m is 20 **QA/QC Disclosed** Polarity: positive Definition: Release includes QA/QC disclosure — certified lab, QP sign-off, or stated methods \(blanks, standards, duplicates\). Why it applies: qaqc\_disclosed is true **Cut-off Undisclosed** Polarity: negative Definition: High-grade interval reported without stating the cut-off grade used for compositing. Why it applies: no cutoff\_grade was stated **Infill Drilling** Polarity: neutral Definition: Confirmatory drilling to raise resource confidence, not new discovery. Why it applies: drill\_program\_type is "mixed" **Nearology Play** Polarity: neutral Definition: Value premise rests on proximity to a known deposit rather than own results. Why it applies: proximity is offered as the value premise: "The Company's expanded land position now totals approximately 13,061 acres, or roughly twenty square miles, following th" ### SM26-055 [Link to this fact](https://atlas-staging.minestarters.com/news/thunder-mountain-gold-advances-ag-au-cu-pb-zn-massive-sulfide-resource-expansion--da3cdd1a-bf1d-4d62-a181-c7b678a527a6#fact-drill-facts-8) South Mountain · lead #### Identity - Hole ID: SM26-055 - Project: South Mountain - Commodity: lead - Region: usa\_id - Reported Region: usa\_id - Ticker: THM #### Geometry - Grade: 0.031 - Grade Unit: % - Intercept: 22.47 m - True Width: 20 m - From: 98.66 m - To: 121.13 m - Hole Depth: 133 m - Intercept Depth: 55.69 m #### Classification - Deposit Type: other - Program: mixed - Sample Type: drill - Group ID: SM26-055:98.66-121.13 - Mining Method: unknown #### Location - Easting: 507036 - Northing: 4732144 - CRS: WGS84 \(meters\) - Azimuth: 335 ° - Dip: -45 ° - Loc. Confidence: high - Loc. Source: document #### QA/QC - Laboratory: MSA Labs - QA/QC Disclosed: Yes - QP Signed: Yes - QA/QC Methods: standards, blanks, duplicates #### Review - Needs Review: No - Interp. Status: scored - Historical: No #### Dates - Event date: 2026-09-17T00:00:00.000Z Reasoning: The lead grade is very low, but its presence supports the polymetallic nature of the broad intercept. - Positive factor: Presence of lead contributes to the polymetallic nature of the deposit. - Negative factor: Lead grade is very low \(310 ppm\). Evidence · table > 310 ppm Context: 22.47 #### Tags used in scoring **True Width Disclosed** Polarity: positive Definition: Actual thickness perpendicular to structure is stated, not just downhole length. Why it applies: true\_width\_m is 20 **QA/QC Disclosed** Polarity: positive Definition: Release includes QA/QC disclosure — certified lab, QP sign-off, or stated methods \(blanks, standards, duplicates\). Why it applies: qaqc\_disclosed is true **Cut-off Undisclosed** Polarity: negative Definition: High-grade interval reported without stating the cut-off grade used for compositing. Why it applies: no cutoff\_grade was stated **Infill Drilling** Polarity: neutral Definition: Confirmatory drilling to raise resource confidence, not new discovery. Why it applies: drill\_program\_type is "mixed" **Nearology Play** Polarity: neutral Definition: Value premise rests on proximity to a known deposit rather than own results. Why it applies: proximity is offered as the value premise: "The Company's expanded land position now totals approximately 13,061 acres, or roughly twenty square miles, following th" ### SM26-055 [Link to this fact](https://atlas-staging.minestarters.com/news/thunder-mountain-gold-advances-ag-au-cu-pb-zn-massive-sulfide-resource-expansion--da3cdd1a-bf1d-4d62-a181-c7b678a527a6#fact-drill-facts-9) South Mountain · zinc #### Identity - Hole ID: SM26-055 - Project: South Mountain - Commodity: zinc - Region: usa\_id - Reported Region: usa\_id - Ticker: THM #### Geometry - Grade: 0.52 - Grade Unit: % - Intercept: 22.47 m - True Width: 20 m - From: 98.66 m - To: 121.13 m - Hole Depth: 133 m - Intercept Depth: 55.69 m #### Classification - Deposit Type: other - Program: mixed - Sample Type: drill - Group ID: SM26-055:98.66-121.13 - Mining Method: unknown #### Location - Easting: 507036 - Northing: 4732144 - CRS: WGS84 \(meters\) - Azimuth: 335 ° - Dip: -45 ° - Loc. Confidence: high - Loc. Source: document #### QA/QC - Laboratory: MSA Labs - QA/QC Disclosed: Yes - QP Signed: Yes - QA/QC Methods: standards, blanks, duplicates #### Review - Needs Review: No - Interp. Status: scored - Historical: No #### Dates - Event date: 2026-09-17T00:00:00.000Z Reasoning: The zinc grade is moderate and contributes to the overall polymetallic nature of the broad intercept. - Positive factor: Moderate zinc grade over a broad interval. - Positive factor: Significant estimated true width. Evidence · table > 0.52 % Context: 22.47 #### Tags used in scoring **True Width Disclosed** Polarity: positive Definition: Actual thickness perpendicular to structure is stated, not just downhole length. Why it applies: true\_width\_m is 20 **QA/QC Disclosed** Polarity: positive Definition: Release includes QA/QC disclosure — certified lab, QP sign-off, or stated methods \(blanks, standards, duplicates\). Why it applies: qaqc\_disclosed is true **Cut-off Undisclosed** Polarity: negative Definition: High-grade interval reported without stating the cut-off grade used for compositing. Why it applies: no cutoff\_grade was stated **Infill Drilling** Polarity: neutral Definition: Confirmatory drilling to raise resource confidence, not new discovery. Why it applies: drill\_program\_type is "mixed" **Nearology Play** Polarity: neutral Definition: Value premise rests on proximity to a known deposit rather than own results. Why it applies: proximity is offered as the value premise: "The Company's expanded land position now totals approximately 13,061 acres, or roughly twenty square miles, following th" ### SM26-055 [Link to this fact](https://atlas-staging.minestarters.com/news/thunder-mountain-gold-advances-ag-au-cu-pb-zn-massive-sulfide-resource-expansion--da3cdd1a-bf1d-4d62-a181-c7b678a527a6#fact-drill-facts-10) South Mountain · silver #### Identity - Hole ID: SM26-055 - Project: South Mountain - Commodity: silver - Region: usa\_id - Reported Region: usa\_id - Ticker: THM #### Geometry - Grade: 141 - Grade Unit: g/t - Intercept: 10.15 m - True Width: 9.03 m - From: 98.66 m - To: 108.81 m - Hole Depth: 133 m - Intercept Depth: 55.69 m #### Classification - Deposit Type: other - Program: mixed - Sample Type: drill - Group ID: SM26-055:98.66-108.81 - Mining Method: unknown #### Location - Easting: 507036 - Northing: 4732144 - CRS: WGS84 \(meters\) - Azimuth: 335 ° - Dip: -45 ° - Loc. Confidence: high - Loc. Source: document #### QA/QC - Laboratory: MSA Labs - QA/QC Disclosed: Yes - QP Signed: Yes - QA/QC Methods: standards, blanks, duplicates #### Review - Needs Review: No - Interp. Status: scored - Historical: No #### Dates - Event date: 2026-09-17T00:00:00.000Z Reasoning: This high-grade silver sub-interval demonstrates strong mineralization within the broader intercept, enhancing its materiality. - Positive factor: High-grade silver in a significant sub-interval. - Positive factor: Good estimated true width. - Positive factor: Indicates higher-grade zones within the broader mineralization. Evidence · table > 141 Context: 10.15 #### Tags used in scoring **True Width Disclosed** Polarity: positive Definition: Actual thickness perpendicular to structure is stated, not just downhole length. Why it applies: true\_width\_m is 9.03 **QA/QC Disclosed** Polarity: positive Definition: Release includes QA/QC disclosure — certified lab, QP sign-off, or stated methods \(blanks, standards, duplicates\). Why it applies: qaqc\_disclosed is true **Cut-off Undisclosed** Polarity: negative Definition: High-grade interval reported without stating the cut-off grade used for compositing. Why it applies: no cutoff\_grade was stated **Infill Drilling** Polarity: neutral Definition: Confirmatory drilling to raise resource confidence, not new discovery. Why it applies: drill\_program\_type is "mixed" **Nearology Play** Polarity: neutral Definition: Value premise rests on proximity to a known deposit rather than own results. Why it applies: proximity is offered as the value premise: "The Company's expanded land position now totals approximately 13,061 acres, or roughly twenty square miles, following th" ### SM26-055 [Link to this fact](https://atlas-staging.minestarters.com/news/thunder-mountain-gold-advances-ag-au-cu-pb-zn-massive-sulfide-resource-expansion--da3cdd1a-bf1d-4d62-a181-c7b678a527a6#fact-drill-facts-11) South Mountain · gold #### Identity - Hole ID: SM26-055 - Project: South Mountain - Commodity: gold - Region: usa\_id - Reported Region: usa\_id - Ticker: THM #### Geometry - Grade: 0.179 - Grade Unit: g/t - Intercept: 10.15 m - True Width: 9.03 m - From: 98.66 m - To: 108.81 m - Hole Depth: 133 m - Intercept Depth: 55.69 m #### Classification - Deposit Type: other - Program: mixed - Sample Type: drill - Group ID: SM26-055:98.66-108.81 - Mining Method: unknown #### Location - Easting: 507036 - Northing: 4732144 - CRS: WGS84 \(meters\) - Azimuth: 335 ° - Dip: -45 ° - Loc. Confidence: high - Loc. Source: document #### QA/QC - Laboratory: MSA Labs - QA/QC Disclosed: Yes - QP Signed: Yes - QA/QC Methods: standards, blanks, duplicates #### Review - Needs Review: No - Interp. Status: scored - Historical: No #### Dates - Event date: 2026-09-17T00:00:00.000Z Reasoning: The gold grade is moderate and contributes to the overall polymetallic nature of the sub-interval. - Positive factor: Associated gold mineralization adds value to the polymetallic intercept. Evidence · table > 0.179 Context: 10.15 #### Tags used in scoring **True Width Disclosed** Polarity: positive Definition: Actual thickness perpendicular to structure is stated, not just downhole length. Why it applies: true\_width\_m is 9.03 **QA/QC Disclosed** Polarity: positive Definition: Release includes QA/QC disclosure — certified lab, QP sign-off, or stated methods \(blanks, standards, duplicates\). Why it applies: qaqc\_disclosed is true **Cut-off Undisclosed** Polarity: negative Definition: High-grade interval reported without stating the cut-off grade used for compositing. Why it applies: no cutoff\_grade was stated **Infill Drilling** Polarity: neutral Definition: Confirmatory drilling to raise resource confidence, not new discovery. Why it applies: drill\_program\_type is "mixed" **Nearology Play** Polarity: neutral Definition: Value premise rests on proximity to a known deposit rather than own results. Why it applies: proximity is offered as the value premise: "The Company's expanded land position now totals approximately 13,061 acres, or roughly twenty square miles, following th" ### SM26-055 [Link to this fact](https://atlas-staging.minestarters.com/news/thunder-mountain-gold-advances-ag-au-cu-pb-zn-massive-sulfide-resource-expansion--da3cdd1a-bf1d-4d62-a181-c7b678a527a6#fact-drill-facts-12) South Mountain · copper #### Identity - Hole ID: SM26-055 - Project: South Mountain - Commodity: copper - Region: usa\_id - Reported Region: usa\_id - Ticker: THM #### Geometry - Grade: 0.74 - Grade Unit: % - Intercept: 10.15 m - True Width: 9.03 m - From: 98.66 m - To: 108.81 m - Hole Depth: 133 m - Intercept Depth: 55.69 m #### Classification - Deposit Type: other - Program: mixed - Sample Type: drill - Group ID: SM26-055:98.66-108.81 - Mining Method: unknown #### Location - Easting: 507036 - Northing: 4732144 - CRS: WGS84 \(meters\) - Azimuth: 335 ° - Dip: -45 ° - Loc. Confidence: high - Loc. Source: document #### QA/QC - Laboratory: MSA Labs - QA/QC Disclosed: Yes - QP Signed: Yes - QA/QC Methods: standards, blanks, duplicates #### Review - Needs Review: No - Interp. Status: scored - Historical: No #### Dates - Event date: 2026-09-17T00:00:00.000Z Reasoning: This copper grade is strong for a polymetallic deposit and contributes significantly to the sub-interval's value. - Positive factor: Good copper grade for a polymetallic deposit. - Positive factor: Good estimated true width. Evidence · table > 0.74 % Context: 10.15 #### Tags used in scoring **True Width Disclosed** Polarity: positive Definition: Actual thickness perpendicular to structure is stated, not just downhole length. Why it applies: true\_width\_m is 9.03 **QA/QC Disclosed** Polarity: positive Definition: Release includes QA/QC disclosure — certified lab, QP sign-off, or stated methods \(blanks, standards, duplicates\). Why it applies: qaqc\_disclosed is true **Cut-off Undisclosed** Polarity: negative Definition: High-grade interval reported without stating the cut-off grade used for compositing. Why it applies: no cutoff\_grade was stated **Infill Drilling** Polarity: neutral Definition: Confirmatory drilling to raise resource confidence, not new discovery. Why it applies: drill\_program\_type is "mixed" **Nearology Play** Polarity: neutral Definition: Value premise rests on proximity to a known deposit rather than own results. Why it applies: proximity is offered as the value premise: "The Company's expanded land position now totals approximately 13,061 acres, or roughly twenty square miles, following th" ### SM26-055 [Link to this fact](https://atlas-staging.minestarters.com/news/thunder-mountain-gold-advances-ag-au-cu-pb-zn-massive-sulfide-resource-expansion--da3cdd1a-bf1d-4d62-a181-c7b678a527a6#fact-drill-facts-13) South Mountain · lead #### Identity - Hole ID: SM26-055 - Project: South Mountain - Commodity: lead - Region: usa\_id - Reported Region: usa\_id - Ticker: THM #### Geometry - Grade: 0.0382 - Grade Unit: % - Intercept: 10.15 m - True Width: 9.03 m - From: 98.66 m - To: 108.81 m - Hole Depth: 133 m - Intercept Depth: 55.69 m #### Classification - Deposit Type: other - Program: mixed - Sample Type: drill - Group ID: SM26-055:98.66-108.81 - Mining Method: unknown #### Location - Easting: 507036 - Northing: 4732144 - CRS: WGS84 \(meters\) - Azimuth: 335 ° - Dip: -45 ° - Loc. Confidence: high - Loc. Source: document #### QA/QC - Laboratory: MSA Labs - QA/QC Disclosed: Yes - QP Signed: Yes - QA/QC Methods: standards, blanks, duplicates #### Review - Needs Review: No - Interp. Status: scored - Historical: No #### Dates - Event date: 2026-09-17T00:00:00.000Z Reasoning: The lead grade is very low, but its presence supports the polymetallic nature of the sub-interval. - Positive factor: Presence of lead contributes to the polymetallic nature of the deposit. - Negative factor: Lead grade is very low \(382 ppm\). Evidence · table > 382 ppm Context: 10.15 #### Tags used in scoring **True Width Disclosed** Polarity: positive Definition: Actual thickness perpendicular to structure is stated, not just downhole length. Why it applies: true\_width\_m is 9.03 **QA/QC Disclosed** Polarity: positive Definition: Release includes QA/QC disclosure — certified lab, QP sign-off, or stated methods \(blanks, standards, duplicates\). Why it applies: qaqc\_disclosed is true **Cut-off Undisclosed** Polarity: negative Definition: High-grade interval reported without stating the cut-off grade used for compositing. Why it applies: no cutoff\_grade was stated **Infill Drilling** Polarity: neutral Definition: Confirmatory drilling to raise resource confidence, not new discovery. Why it applies: drill\_program\_type is "mixed" **Nearology Play** Polarity: neutral Definition: Value premise rests on proximity to a known deposit rather than own results. Why it applies: proximity is offered as the value premise: "The Company's expanded land position now totals approximately 13,061 acres, or roughly twenty square miles, following th" ### SM26-055 [Link to this fact](https://atlas-staging.minestarters.com/news/thunder-mountain-gold-advances-ag-au-cu-pb-zn-massive-sulfide-resource-expansion--da3cdd1a-bf1d-4d62-a181-c7b678a527a6#fact-drill-facts-14) South Mountain · zinc #### Identity - Hole ID: SM26-055 - Project: South Mountain - Commodity: zinc - Region: usa\_id - Reported Region: usa\_id - Ticker: THM #### Geometry - Grade: 1 - Grade Unit: % - Intercept: 10.15 m - True Width: 9.03 m - From: 98.66 m - To: 108.81 m - Hole Depth: 133 m - Intercept Depth: 55.69 m #### Classification - Deposit Type: other - Program: mixed - Sample Type: drill - Group ID: SM26-055:98.66-108.81 - Mining Method: unknown #### Location - Easting: 507036 - Northing: 4732144 - CRS: WGS84 \(meters\) - Azimuth: 335 ° - Dip: -45 ° - Loc. Confidence: high - Loc. Source: document #### QA/QC - Laboratory: MSA Labs - QA/QC Disclosed: Yes - QP Signed: Yes - QA/QC Methods: standards, blanks, duplicates #### Review - Needs Review: No - Interp. Status: scored - Historical: No #### Dates - Event date: 2026-09-17T00:00:00.000Z Reasoning: This zinc grade is strong for a polymetallic deposit and contributes significantly to the sub-interval's value. - Positive factor: Good zinc grade for a polymetallic deposit. - Positive factor: Good estimated true width. Evidence · table > 1.00 % Context: 10.15 #### Tags used in scoring **True Width Disclosed** Polarity: positive Definition: Actual thickness perpendicular to structure is stated, not just downhole length. Why it applies: true\_width\_m is 9.03 **QA/QC Disclosed** Polarity: positive Definition: Release includes QA/QC disclosure — certified lab, QP sign-off, or stated methods \(blanks, standards, duplicates\). Why it applies: qaqc\_disclosed is true **Cut-off Undisclosed** Polarity: negative Definition: High-grade interval reported without stating the cut-off grade used for compositing. Why it applies: no cutoff\_grade was stated **Infill Drilling** Polarity: neutral Definition: Confirmatory drilling to raise resource confidence, not new discovery. Why it applies: drill\_program\_type is "mixed" **Nearology Play** Polarity: neutral Definition: Value premise rests on proximity to a known deposit rather than own results. Why it applies: proximity is offered as the value premise: "The Company's expanded land position now totals approximately 13,061 acres, or roughly twenty square miles, following th" ### SM26-055 [Link to this fact](https://atlas-staging.minestarters.com/news/thunder-mountain-gold-advances-ag-au-cu-pb-zn-massive-sulfide-resource-expansion--da3cdd1a-bf1d-4d62-a181-c7b678a527a6#fact-drill-facts-15) South Mountain · silver #### Identity - Hole ID: SM26-055 - Project: South Mountain - Commodity: silver - Region: usa\_id - Reported Region: usa\_id - Ticker: THM #### Geometry - Grade: 124 - Grade Unit: g/t - Intercept: 7.43 m - True Width: 6.61 m - From: 101.38 m - To: 108.81 m - Hole Depth: 133 m - Intercept Depth: 55.69 m #### Classification - Deposit Type: other - Program: mixed - Sample Type: drill - Group ID: SM26-055:101.38-108.81 - Mining Method: unknown #### Location - Easting: 507036 - Northing: 4732144 - CRS: WGS84 \(meters\) - Azimuth: 335 ° - Dip: -45 ° - Loc. Confidence: high - Loc. Source: document #### QA/QC - Laboratory: MSA Labs - QA/QC Disclosed: Yes - QP Signed: Yes - QA/QC Methods: standards, blanks, duplicates #### Review - Needs Review: No - Interp. Status: scored - Historical: No #### Dates - Event date: 2026-09-17T00:00:00.000Z Reasoning: This strong silver sub-interval further highlights the high-grade nature of the mineralization within the broader intercept. - Positive factor: Strong silver grade in a significant sub-interval. - Positive factor: Good estimated true width. - Positive factor: Indicates higher-grade zones within the broader mineralization. Evidence · table > 124 Context: 7.43 #### Tags used in scoring **True Width Disclosed** Polarity: positive Definition: Actual thickness perpendicular to structure is stated, not just downhole length. Why it applies: true\_width\_m is 6.61 **QA/QC Disclosed** Polarity: positive Definition: Release includes QA/QC disclosure — certified lab, QP sign-off, or stated methods \(blanks, standards, duplicates\). Why it applies: qaqc\_disclosed is true **Cut-off Undisclosed** Polarity: negative Definition: High-grade interval reported without stating the cut-off grade used for compositing. Why it applies: no cutoff\_grade was stated **Infill Drilling** Polarity: neutral Definition: Confirmatory drilling to raise resource confidence, not new discovery. Why it applies: drill\_program\_type is "mixed" **Nearology Play** Polarity: neutral Definition: Value premise rests on proximity to a known deposit rather than own results. Why it applies: proximity is offered as the value premise: "The Company's expanded land position now totals approximately 13,061 acres, or roughly twenty square miles, following th" ### SM26-055 [Link to this fact](https://atlas-staging.minestarters.com/news/thunder-mountain-gold-advances-ag-au-cu-pb-zn-massive-sulfide-resource-expansion--da3cdd1a-bf1d-4d62-a181-c7b678a527a6#fact-drill-facts-16) South Mountain · gold #### Identity - Hole ID: SM26-055 - Project: South Mountain - Commodity: gold - Region: usa\_id - Reported Region: usa\_id - Ticker: THM #### Geometry - Grade: 0.203 - Grade Unit: g/t - Intercept: 7.43 m - True Width: 6.61 m - From: 101.38 m - To: 108.81 m - Hole Depth: 133 m - Intercept Depth: 55.69 m #### Classification - Deposit Type: other - Program: mixed - Sample Type: drill - Group ID: SM26-055:101.38-108.81 - Mining Method: unknown #### Location - Easting: 507036 - Northing: 4732144 - CRS: WGS84 \(meters\) - Azimuth: 335 ° - Dip: -45 ° - Loc. Confidence: high - Loc. Source: document #### QA/QC - Laboratory: MSA Labs - QA/QC Disclosed: Yes - QP Signed: Yes - QA/QC Methods: standards, blanks, duplicates #### Review - Needs Review: No - Interp. Status: scored - Historical: No #### Dates - Event date: 2026-09-17T00:00:00.000Z Reasoning: The gold grade is moderate and contributes to the overall polymetallic nature of the sub-interval. - Positive factor: Associated gold mineralization adds value to the polymetallic intercept. Evidence · table > 0.203 Context: 7.43 #### Tags used in scoring **True Width Disclosed** Polarity: positive Definition: Actual thickness perpendicular to structure is stated, not just downhole length. Why it applies: true\_width\_m is 6.61 **QA/QC Disclosed** Polarity: positive Definition: Release includes QA/QC disclosure — certified lab, QP sign-off, or stated methods \(blanks, standards, duplicates\). Why it applies: qaqc\_disclosed is true **Cut-off Undisclosed** Polarity: negative Definition: High-grade interval reported without stating the cut-off grade used for compositing. Why it applies: no cutoff\_grade was stated **Infill Drilling** Polarity: neutral Definition: Confirmatory drilling to raise resource confidence, not new discovery. Why it applies: drill\_program\_type is "mixed" **Nearology Play** Polarity: neutral Definition: Value premise rests on proximity to a known deposit rather than own results. Why it applies: proximity is offered as the value premise: "The Company's expanded land position now totals approximately 13,061 acres, or roughly twenty square miles, following th" ### SM26-055 [Link to this fact](https://atlas-staging.minestarters.com/news/thunder-mountain-gold-advances-ag-au-cu-pb-zn-massive-sulfide-resource-expansion--da3cdd1a-bf1d-4d62-a181-c7b678a527a6#fact-drill-facts-17) South Mountain · copper #### Identity - Hole ID: SM26-055 - Project: South Mountain - Commodity: copper - Region: usa\_id - Reported Region: usa\_id - Ticker: THM #### Geometry - Grade: 1.01 - Grade Unit: % - Intercept: 7.43 m - True Width: 6.61 m - From: 101.38 m - To: 108.81 m - Hole Depth: 133 m - Intercept Depth: 55.69 m #### Classification - Deposit Type: other - Program: mixed - Sample Type: drill - Group ID: SM26-055:101.38-108.81 - Mining Method: unknown #### Location - Easting: 507036 - Northing: 4732144 - CRS: WGS84 \(meters\) - Azimuth: 335 ° - Dip: -45 ° - Loc. Confidence: high - Loc. Source: document #### QA/QC - Laboratory: MSA Labs - QA/QC Disclosed: Yes - QP Signed: Yes - QA/QC Methods: standards, blanks, duplicates #### Review - Needs Review: No - Interp. Status: scored - Historical: No #### Dates - Event date: 2026-09-17T00:00:00.000Z Reasoning: This strong copper grade significantly enhances the value of the sub-interval within the polymetallic system. - Positive factor: Strong copper grade for a polymetallic deposit. - Positive factor: Good estimated true width. Evidence · table > 1.01 % Context: 7.43 #### Tags used in scoring **True Width Disclosed** Polarity: positive Definition: Actual thickness perpendicular to structure is stated, not just downhole length. Why it applies: true\_width\_m is 6.61 **QA/QC Disclosed** Polarity: positive Definition: Release includes QA/QC disclosure — certified lab, QP sign-off, or stated methods \(blanks, standards, duplicates\). Why it applies: qaqc\_disclosed is true **Cut-off Undisclosed** Polarity: negative Definition: High-grade interval reported without stating the cut-off grade used for compositing. Why it applies: no cutoff\_grade was stated **Infill Drilling** Polarity: neutral Definition: Confirmatory drilling to raise resource confidence, not new discovery. Why it applies: drill\_program\_type is "mixed" **Nearology Play** Polarity: neutral Definition: Value premise rests on proximity to a known deposit rather than own results. Why it applies: proximity is offered as the value premise: "The Company's expanded land position now totals approximately 13,061 acres, or roughly twenty square miles, following th" ### SM26-055 [Link to this fact](https://atlas-staging.minestarters.com/news/thunder-mountain-gold-advances-ag-au-cu-pb-zn-massive-sulfide-resource-expansion--da3cdd1a-bf1d-4d62-a181-c7b678a527a6#fact-drill-facts-18) South Mountain · lead #### Identity - Hole ID: SM26-055 - Project: South Mountain - Commodity: lead - Region: usa\_id - Reported Region: usa\_id - Ticker: THM #### Geometry - Grade: 0.0385 - Grade Unit: % - Intercept: 7.43 m - True Width: 6.61 m - From: 101.38 m - To: 108.81 m - Hole Depth: 133 m - Intercept Depth: 55.69 m #### Classification - Deposit Type: other - Program: mixed - Sample Type: drill - Group ID: SM26-055:101.38-108.81 - Mining Method: unknown #### Location - Easting: 507036 - Northing: 4732144 - CRS: WGS84 \(meters\) - Azimuth: 335 ° - Dip: -45 ° - Loc. Confidence: high - Loc. Source: document #### QA/QC - Laboratory: MSA Labs - QA/QC Disclosed: Yes - QP Signed: Yes - QA/QC Methods: standards, blanks, duplicates #### Review - Needs Review: No - Interp. Status: scored - Historical: No #### Dates - Event date: 2026-09-17T00:00:00.000Z Reasoning: The lead grade is very low, but its presence supports the polymetallic nature of the sub-interval. - Positive factor: Presence of lead contributes to the polymetallic nature of the deposit. - Negative factor: Lead grade is very low \(385 ppm\). Evidence · table > 385 ppm Context: 7.43 #### Tags used in scoring **True Width Disclosed** Polarity: positive Definition: Actual thickness perpendicular to structure is stated, not just downhole length. Why it applies: true\_width\_m is 6.61 **QA/QC Disclosed** Polarity: positive Definition: Release includes QA/QC disclosure — certified lab, QP sign-off, or stated methods \(blanks, standards, duplicates\). Why it applies: qaqc\_disclosed is true **Cut-off Undisclosed** Polarity: negative Definition: High-grade interval reported without stating the cut-off grade used for compositing. Why it applies: no cutoff\_grade was stated **Infill Drilling** Polarity: neutral Definition: Confirmatory drilling to raise resource confidence, not new discovery. Why it applies: drill\_program\_type is "mixed" **Nearology Play** Polarity: neutral Definition: Value premise rests on proximity to a known deposit rather than own results. Why it applies: proximity is offered as the value premise: "The Company's expanded land position now totals approximately 13,061 acres, or roughly twenty square miles, following th" ### SM26-055 [Link to this fact](https://atlas-staging.minestarters.com/news/thunder-mountain-gold-advances-ag-au-cu-pb-zn-massive-sulfide-resource-expansion--da3cdd1a-bf1d-4d62-a181-c7b678a527a6#fact-drill-facts-19) South Mountain · zinc #### Identity - Hole ID: SM26-055 - Project: South Mountain - Commodity: zinc - Region: usa\_id - Reported Region: usa\_id - Ticker: THM #### Geometry - Grade: 1.36 - Grade Unit: % - Intercept: 7.43 m - True Width: 6.61 m - From: 101.38 m - To: 108.81 m - Hole Depth: 133 m - Intercept Depth: 55.69 m #### Classification - Deposit Type: other - Program: mixed - Sample Type: drill - Group ID: SM26-055:101.38-108.81 - Mining Method: unknown #### Location - Easting: 507036 - Northing: 4732144 - CRS: WGS84 \(meters\) - Azimuth: 335 ° - Dip: -45 ° - Loc. Confidence: high - Loc. Source: document #### QA/QC - Laboratory: MSA Labs - QA/QC Disclosed: Yes - QP Signed: Yes - QA/QC Methods: standards, blanks, duplicates #### Review - Needs Review: No - Interp. Status: scored - Historical: No #### Dates - Event date: 2026-09-17T00:00:00.000Z Reasoning: This strong zinc grade significantly enhances the value of the sub-interval within the polymetallic system. - Positive factor: Strong zinc grade for a polymetallic deposit. - Positive factor: Good estimated true width. Evidence · table > 1.36 Context: 7.43 #### Tags used in scoring **True Width Disclosed** Polarity: positive Definition: Actual thickness perpendicular to structure is stated, not just downhole length. Why it applies: true\_width\_m is 6.61 **QA/QC Disclosed** Polarity: positive Definition: Release includes QA/QC disclosure — certified lab, QP sign-off, or stated methods \(blanks, standards, duplicates\). Why it applies: qaqc\_disclosed is true **Cut-off Undisclosed** Polarity: negative Definition: High-grade interval reported without stating the cut-off grade used for compositing. Why it applies: no cutoff\_grade was stated **Infill Drilling** Polarity: neutral Definition: Confirmatory drilling to raise resource confidence, not new discovery. Why it applies: drill\_program\_type is "mixed" **Nearology Play** Polarity: neutral Definition: Value premise rests on proximity to a known deposit rather than own results. Why it applies: proximity is offered as the value premise: "The Company's expanded land position now totals approximately 13,061 acres, or roughly twenty square miles, following th" ### SM26-055 [Link to this fact](https://atlas-staging.minestarters.com/news/thunder-mountain-gold-advances-ag-au-cu-pb-zn-massive-sulfide-resource-expansion--da3cdd1a-bf1d-4d62-a181-c7b678a527a6#fact-drill-facts-20) South Mountain · silver #### Identity - Hole ID: SM26-055 - Project: South Mountain - Commodity: silver - Region: usa\_id - Reported Region: usa\_id - Ticker: THM #### Geometry - Grade: 133 - Grade Unit: g/t - Intercept: 5.03 m - True Width: 4.48 m - From: 103.78 m - To: 108.81 m - Hole Depth: 133 m - Intercept Depth: 55.69 m #### Classification - Deposit Type: other - Program: mixed - Sample Type: drill - Group ID: SM26-055:103.78-108.81 - Mining Method: unknown #### Location - Easting: 507036 - Northing: 4732144 - CRS: WGS84 \(meters\) - Azimuth: 335 ° - Dip: -45 ° - Loc. Confidence: high - Loc. Source: document #### QA/QC - Laboratory: MSA Labs - QA/QC Disclosed: Yes - QP Signed: Yes - QA/QC Methods: standards, blanks, duplicates #### Review - Needs Review: No - Interp. Status: scored - Historical: No #### Dates - Event date: 2026-09-17T00:00:00.000Z Reasoning: This high-grade silver sub-interval further demonstrates strong mineralization within the broader intercept, enhancing its materiality. - Positive factor: High-grade silver in a significant sub-interval. - Positive factor: Good estimated true width. - Positive factor: Indicates higher-grade zones within the broader mineralization. Evidence · table > 133 Context: 5.03 #### Tags used in scoring **True Width Disclosed** Polarity: positive Definition: Actual thickness perpendicular to structure is stated, not just downhole length. Why it applies: true\_width\_m is 4.48 **QA/QC Disclosed** Polarity: positive Definition: Release includes QA/QC disclosure — certified lab, QP sign-off, or stated methods \(blanks, standards, duplicates\). Why it applies: qaqc\_disclosed is true **Cut-off Undisclosed** Polarity: negative Definition: High-grade interval reported without stating the cut-off grade used for compositing. Why it applies: no cutoff\_grade was stated **Infill Drilling** Polarity: neutral Definition: Confirmatory drilling to raise resource confidence, not new discovery. Why it applies: drill\_program\_type is "mixed" **Nearology Play** Polarity: neutral Definition: Value premise rests on proximity to a known deposit rather than own results. Why it applies: proximity is offered as the value premise: "The Company's expanded land position now totals approximately 13,061 acres, or roughly twenty square miles, following th" ### SM26-055 [Link to this fact](https://atlas-staging.minestarters.com/news/thunder-mountain-gold-advances-ag-au-cu-pb-zn-massive-sulfide-resource-expansion--da3cdd1a-bf1d-4d62-a181-c7b678a527a6#fact-drill-facts-21) South Mountain · gold #### Identity - Hole ID: SM26-055 - Project: South Mountain - Commodity: gold - Region: usa\_id - Reported Region: usa\_id - Ticker: THM #### Geometry - Grade: 0.179 - Grade Unit: g/t - Intercept: 5.03 m - True Width: 4.48 m - From: 103.78 m - To: 108.81 m - Hole Depth: 133 m - Intercept Depth: 55.69 m #### Classification - Deposit Type: other - Program: mixed - Sample Type: drill - Group ID: SM26-055:103.78-108.81 - Mining Method: unknown #### Location - Easting: 507036 - Northing: 4732144 - CRS: WGS84 \(meters\) - Azimuth: 335 ° - Dip: -45 ° - Loc. Confidence: high - Loc. Source: document #### QA/QC - Laboratory: MSA Labs - QA/QC Disclosed: Yes - QP Signed: Yes - QA/QC Methods: standards, blanks, duplicates #### Review - Needs Review: No - Interp. Status: scored - Historical: No #### Dates - Event date: 2026-09-17T00:00:00.000Z Reasoning: The gold grade is moderate and contributes to the overall polymetallic nature of the sub-interval. - Positive factor: Associated gold mineralization adds value to the polymetallic intercept. Evidence · table > 0.179 Context: 5.03 #### Tags used in scoring **True Width Disclosed** Polarity: positive Definition: Actual thickness perpendicular to structure is stated, not just downhole length. Why it applies: true\_width\_m is 4.48 **QA/QC Disclosed** Polarity: positive Definition: Release includes QA/QC disclosure — certified lab, QP sign-off, or stated methods \(blanks, standards, duplicates\). Why it applies: qaqc\_disclosed is true **Cut-off Undisclosed** Polarity: negative Definition: High-grade interval reported without stating the cut-off grade used for compositing. Why it applies: no cutoff\_grade was stated **Infill Drilling** Polarity: neutral Definition: Confirmatory drilling to raise resource confidence, not new discovery. Why it applies: drill\_program\_type is "mixed" **Nearology Play** Polarity: neutral Definition: Value premise rests on proximity to a known deposit rather than own results. Why it applies: proximity is offered as the value premise: "The Company's expanded land position now totals approximately 13,061 acres, or roughly twenty square miles, following th" ### SM26-055 [Link to this fact](https://atlas-staging.minestarters.com/news/thunder-mountain-gold-advances-ag-au-cu-pb-zn-massive-sulfide-resource-expansion--da3cdd1a-bf1d-4d62-a181-c7b678a527a6#fact-drill-facts-22) South Mountain · copper #### Identity - Hole ID: SM26-055 - Project: South Mountain - Commodity: copper - Region: usa\_id - Reported Region: usa\_id - Ticker: THM #### Geometry - Grade: 1.47 - Grade Unit: % - Intercept: 5.03 m - True Width: 4.48 m - From: 103.78 m - To: 108.81 m - Hole Depth: 133 m - Intercept Depth: 55.69 m #### Classification - Deposit Type: other - Program: mixed - Sample Type: drill - Group ID: SM26-055:103.78-108.81 - Mining Method: unknown #### Location - Easting: 507036 - Northing: 4732144 - CRS: WGS84 \(meters\) - Azimuth: 335 ° - Dip: -45 ° - Loc. Confidence: high - Loc. Source: document #### QA/QC - Laboratory: MSA Labs - QA/QC Disclosed: Yes - QP Signed: Yes - QA/QC Methods: standards, blanks, duplicates #### Review - Needs Review: No - Interp. Status: scored - Historical: No #### Dates - Event date: 2026-09-17T00:00:00.000Z Reasoning: This high-grade copper significantly enhances the value of the sub-interval within the polymetallic system. - Positive factor: High-grade copper for a polymetallic deposit. - Positive factor: Good estimated true width. Evidence · table > 1.47 % Context: 5.03 #### Tags used in scoring **True Width Disclosed** Polarity: positive Definition: Actual thickness perpendicular to structure is stated, not just downhole length. Why it applies: true\_width\_m is 4.48 **QA/QC Disclosed** Polarity: positive Definition: Release includes QA/QC disclosure — certified lab, QP sign-off, or stated methods \(blanks, standards, duplicates\). Why it applies: qaqc\_disclosed is true **Cut-off Undisclosed** Polarity: negative Definition: High-grade interval reported without stating the cut-off grade used for compositing. Why it applies: no cutoff\_grade was stated **Infill Drilling** Polarity: neutral Definition: Confirmatory drilling to raise resource confidence, not new discovery. Why it applies: drill\_program\_type is "mixed" **Nearology Play** Polarity: neutral Definition: Value premise rests on proximity to a known deposit rather than own results. Why it applies: proximity is offered as the value premise: "The Company's expanded land position now totals approximately 13,061 acres, or roughly twenty square miles, following th" ### SM26-055 [Link to this fact](https://atlas-staging.minestarters.com/news/thunder-mountain-gold-advances-ag-au-cu-pb-zn-massive-sulfide-resource-expansion--da3cdd1a-bf1d-4d62-a181-c7b678a527a6#fact-drill-facts-23) South Mountain · lead #### Identity - Hole ID: SM26-055 - Project: South Mountain - Commodity: lead - Region: usa\_id - Reported Region: usa\_id - Ticker: THM #### Geometry - Grade: 0.0318 - Grade Unit: % - Intercept: 5.03 m - True Width: 4.48 m - From: 103.78 m - To: 108.81 m - Hole Depth: 133 m - Intercept Depth: 55.69 m #### Classification - Deposit Type: other - Program: mixed - Sample Type: drill - Group ID: SM26-055:103.78-108.81 - Mining Method: unknown #### Location - Easting: 507036 - Northing: 4732144 - CRS: WGS84 \(meters\) - Azimuth: 335 ° - Dip: -45 ° - Loc. Confidence: high - Loc. Source: document #### QA/QC - Laboratory: MSA Labs - QA/QC Disclosed: Yes - QP Signed: Yes - QA/QC Methods: standards, blanks, duplicates #### Review - Needs Review: No - Interp. Status: scored - Historical: No #### Dates - Event date: 2026-09-17T00:00:00.000Z Reasoning: The lead grade is very low, but its presence supports the polymetallic nature of the sub-interval. - Positive factor: Presence of lead contributes to the polymetallic nature of the deposit. - Negative factor: Lead grade is very low \(318 ppm\). Evidence · table > 318 ppm Context: 5.03 #### Tags used in scoring **True Width Disclosed** Polarity: positive Definition: Actual thickness perpendicular to structure is stated, not just downhole length. Why it applies: true\_width\_m is 4.48 **QA/QC Disclosed** Polarity: positive Definition: Release includes QA/QC disclosure — certified lab, QP sign-off, or stated methods \(blanks, standards, duplicates\). Why it applies: qaqc\_disclosed is true **Cut-off Undisclosed** Polarity: negative Definition: High-grade interval reported without stating the cut-off grade used for compositing. Why it applies: no cutoff\_grade was stated **Infill Drilling** Polarity: neutral Definition: Confirmatory drilling to raise resource confidence, not new discovery. Why it applies: drill\_program\_type is "mixed" **Nearology Play** Polarity: neutral Definition: Value premise rests on proximity to a known deposit rather than own results. Why it applies: proximity is offered as the value premise: "The Company's expanded land position now totals approximately 13,061 acres, or roughly twenty square miles, following th" ### SM26-055 [Link to this fact](https://atlas-staging.minestarters.com/news/thunder-mountain-gold-advances-ag-au-cu-pb-zn-massive-sulfide-resource-expansion--da3cdd1a-bf1d-4d62-a181-c7b678a527a6#fact-drill-facts-24) South Mountain · zinc #### Identity - Hole ID: SM26-055 - Project: South Mountain - Commodity: zinc - Region: usa\_id - Reported Region: usa\_id - Ticker: THM #### Geometry - Grade: 1.95 - Grade Unit: % - Intercept: 5.03 m - True Width: 4.48 m - From: 103.78 m - To: 108.81 m - Hole Depth: 133 m - Intercept Depth: 55.69 m #### Classification - Deposit Type: other - Program: mixed - Sample Type: drill - Group ID: SM26-055:103.78-108.81 - Mining Method: unknown #### Location - Easting: 507036 - Northing: 4732144 - CRS: WGS84 \(meters\) - Azimuth: 335 ° - Dip: -45 ° - Loc. Confidence: high - Loc. Source: document #### QA/QC - Laboratory: MSA Labs - QA/QC Disclosed: Yes - QP Signed: Yes - QA/QC Methods: standards, blanks, duplicates #### Review - Needs Review: No - Interp. Status: scored - Historical: No #### Dates - Event date: 2026-09-17T00:00:00.000Z Reasoning: This high-grade zinc significantly enhances the value of the sub-interval within the polymetallic system. - Positive factor: High-grade zinc for a polymetallic deposit. - Positive factor: Good estimated true width. Evidence · table > 1.95 % Context: 5.03 #### Tags used in scoring **True Width Disclosed** Polarity: positive Definition: Actual thickness perpendicular to structure is stated, not just downhole length. Why it applies: true\_width\_m is 4.48 **QA/QC Disclosed** Polarity: positive Definition: Release includes QA/QC disclosure — certified lab, QP sign-off, or stated methods \(blanks, standards, duplicates\). Why it applies: qaqc\_disclosed is true **Cut-off Undisclosed** Polarity: negative Definition: High-grade interval reported without stating the cut-off grade used for compositing. Why it applies: no cutoff\_grade was stated **Infill Drilling** Polarity: neutral Definition: Confirmatory drilling to raise resource confidence, not new discovery. Why it applies: drill\_program\_type is "mixed" **Nearology Play** Polarity: neutral Definition: Value premise rests on proximity to a known deposit rather than own results. Why it applies: proximity is offered as the value premise: "The Company's expanded land position now totals approximately 13,061 acres, or roughly twenty square miles, following th" ### SM26-056 [Link to this fact](https://atlas-staging.minestarters.com/news/thunder-mountain-gold-advances-ag-au-cu-pb-zn-massive-sulfide-resource-expansion--da3cdd1a-bf1d-4d62-a181-c7b678a527a6#fact-drill-facts-25) South Mountain · silver #### Identity - Hole ID: SM26-056 - Project: South Mountain - Commodity: silver - Region: usa\_id - Reported Region: usa\_id - Ticker: THM #### Geometry - Grade: 67 - Grade Unit: g/t - Intercept: 7.62 m - True Width: 5.49 m - From: 125.88 m - To: 133.5 m - Hole Depth: 169 m - Intercept Depth: 125.88 m #### Classification - Deposit Type: other - Program: mixed - Sample Type: drill - Group ID: SM26-056:125.88-133.5 - Mining Method: unknown #### Location - Easting: 507036 - Northing: 4732144 - CRS: WGS84 \(meters\) - Azimuth: 335 ° - Dip: -85 ° - Loc. Confidence: high - Loc. Source: document #### QA/QC - Laboratory: MSA Labs - QA/QC Disclosed: Yes - QP Signed: Yes - QA/QC Methods: standards, blanks, duplicates #### Review - Needs Review: No - Interp. Status: scored - Historical: No #### Dates - Event date: 2026-09-17T00:00:00.000Z Reasoning: This intercept shows a good silver grade with a significant estimated true width, contributing to the resource expansion efforts. - Positive factor: Good silver grade for an exploration intercept. - Positive factor: True width estimated, providing better context. - Positive factor: Part of a program expanding known mineralization. Evidence · table > 67 Context: 7.62 #### Tags used in scoring **True Width Disclosed** Polarity: positive Definition: Actual thickness perpendicular to structure is stated, not just downhole length. Why it applies: true\_width\_m is 5.49 **QA/QC Disclosed** Polarity: positive Definition: Release includes QA/QC disclosure — certified lab, QP sign-off, or stated methods \(blanks, standards, duplicates\). Why it applies: qaqc\_disclosed is true **Cut-off Undisclosed** Polarity: negative Definition: High-grade interval reported without stating the cut-off grade used for compositing. Why it applies: no cutoff\_grade was stated **Infill Drilling** Polarity: neutral Definition: Confirmatory drilling to raise resource confidence, not new discovery. Why it applies: drill\_program\_type is "mixed" **Nearology Play** Polarity: neutral Definition: Value premise rests on proximity to a known deposit rather than own results. Why it applies: proximity is offered as the value premise: "The Company's expanded land position now totals approximately 13,061 acres, or roughly twenty square miles, following th" ### SM26-056 [Link to this fact](https://atlas-staging.minestarters.com/news/thunder-mountain-gold-advances-ag-au-cu-pb-zn-massive-sulfide-resource-expansion--da3cdd1a-bf1d-4d62-a181-c7b678a527a6#fact-drill-facts-26) South Mountain · gold #### Identity - Hole ID: SM26-056 - Project: South Mountain - Commodity: gold - Region: usa\_id - Reported Region: usa\_id - Ticker: THM #### Geometry - Grade: 0.046 - Grade Unit: g/t - Intercept: 7.62 m - True Width: 5.49 m - From: 125.88 m - To: 133.5 m - Hole Depth: 169 m - Intercept Depth: 125.88 m #### Classification - Deposit Type: other - Program: mixed - Sample Type: drill - Group ID: SM26-056:125.88-133.5 - Mining Method: unknown #### Location - Easting: 507036 - Northing: 4732144 - CRS: WGS84 \(meters\) - Azimuth: 335 ° - Dip: -85 ° - Loc. Confidence: high - Loc. Source: document #### QA/QC - Laboratory: MSA Labs - QA/QC Disclosed: Yes - QP Signed: Yes - QA/QC Methods: standards, blanks, duplicates #### Review - Needs Review: No - Interp. Status: scored - Historical: No #### Dates - Event date: 2026-09-17T00:00:00.000Z Reasoning: The gold grade is very low but its presence supports the polymetallic nature of the intercept. - Positive factor: Associated gold mineralization adds value to the polymetallic intercept. - Negative factor: Gold grade is very low. Evidence · table > 0.046 Context: 7.62 #### Tags used in scoring **True Width Disclosed** Polarity: positive Definition: Actual thickness perpendicular to structure is stated, not just downhole length. Why it applies: true\_width\_m is 5.49 **QA/QC Disclosed** Polarity: positive Definition: Release includes QA/QC disclosure — certified lab, QP sign-off, or stated methods \(blanks, standards, duplicates\). Why it applies: qaqc\_disclosed is true **Cut-off Undisclosed** Polarity: negative Definition: High-grade interval reported without stating the cut-off grade used for compositing. Why it applies: no cutoff\_grade was stated **Infill Drilling** Polarity: neutral Definition: Confirmatory drilling to raise resource confidence, not new discovery. Why it applies: drill\_program\_type is "mixed" **Nearology Play** Polarity: neutral Definition: Value premise rests on proximity to a known deposit rather than own results. Why it applies: proximity is offered as the value premise: "The Company's expanded land position now totals approximately 13,061 acres, or roughly twenty square miles, following th" ### SM26-056 [Link to this fact](https://atlas-staging.minestarters.com/news/thunder-mountain-gold-advances-ag-au-cu-pb-zn-massive-sulfide-resource-expansion--da3cdd1a-bf1d-4d62-a181-c7b678a527a6#fact-drill-facts-27) South Mountain · copper #### Identity - Hole ID: SM26-056 - Project: South Mountain - Commodity: copper - Region: usa\_id - Reported Region: usa\_id - Ticker: THM #### Geometry - Grade: 0.39 - Grade Unit: % - Intercept: 7.62 m - True Width: 5.49 m - From: 125.88 m - To: 133.5 m - Hole Depth: 169 m - Intercept Depth: 125.88 m #### Classification - Deposit Type: other - Program: mixed - Sample Type: drill - Group ID: SM26-056:125.88-133.5 - Mining Method: unknown #### Location - Easting: 507036 - Northing: 4732144 - CRS: WGS84 \(meters\) - Azimuth: 335 ° - Dip: -85 ° - Loc. Confidence: high - Loc. Source: document #### QA/QC - Laboratory: MSA Labs - QA/QC Disclosed: Yes - QP Signed: Yes - QA/QC Methods: standards, blanks, duplicates #### Review - Needs Review: No - Interp. Status: scored - Historical: No #### Dates - Event date: 2026-09-17T00:00:00.000Z Reasoning: The copper grade is moderate and contributes to the overall polymetallic nature of the intercept. - Positive factor: Moderate copper grade for a polymetallic intercept. - Positive factor: True width estimated, providing better context. Evidence · table > 0.39 % Context: 7.62 #### Tags used in scoring **True Width Disclosed** Polarity: positive Definition: Actual thickness perpendicular to structure is stated, not just downhole length. Why it applies: true\_width\_m is 5.49 **QA/QC Disclosed** Polarity: positive Definition: Release includes QA/QC disclosure — certified lab, QP sign-off, or stated methods \(blanks, standards, duplicates\). Why it applies: qaqc\_disclosed is true **Cut-off Undisclosed** Polarity: negative Definition: High-grade interval reported without stating the cut-off grade used for compositing. Why it applies: no cutoff\_grade was stated **Infill Drilling** Polarity: neutral Definition: Confirmatory drilling to raise resource confidence, not new discovery. Why it applies: drill\_program\_type is "mixed" **Nearology Play** Polarity: neutral Definition: Value premise rests on proximity to a known deposit rather than own results. Why it applies: proximity is offered as the value premise: "The Company's expanded land position now totals approximately 13,061 acres, or roughly twenty square miles, following th" ### SM26-056 [Link to this fact](https://atlas-staging.minestarters.com/news/thunder-mountain-gold-advances-ag-au-cu-pb-zn-massive-sulfide-resource-expansion--da3cdd1a-bf1d-4d62-a181-c7b678a527a6#fact-drill-facts-28) South Mountain · lead #### Identity - Hole ID: SM26-056 - Project: South Mountain - Commodity: lead - Region: usa\_id - Reported Region: usa\_id - Ticker: THM #### Geometry - Grade: 0.0122 - Grade Unit: % - Intercept: 7.62 m - True Width: 5.49 m - From: 125.88 m - To: 133.5 m - Hole Depth: 169 m - Intercept Depth: 125.88 m #### Classification - Deposit Type: other - Program: mixed - Sample Type: drill - Group ID: SM26-056:125.88-133.5 - Mining Method: unknown #### Location - Easting: 507036 - Northing: 4732144 - CRS: WGS84 \(meters\) - Azimuth: 335 ° - Dip: -85 ° - Loc. Confidence: high - Loc. Source: document #### QA/QC - Laboratory: MSA Labs - QA/QC Disclosed: Yes - QP Signed: Yes - QA/QC Methods: standards, blanks, duplicates #### Review - Needs Review: No - Interp. Status: scored - Historical: No #### Dates - Event date: 2026-09-17T00:00:00.000Z Reasoning: The lead grade is very low, but its presence supports the polymetallic nature of the intercept. - Positive factor: Presence of lead contributes to the polymetallic nature of the deposit. - Negative factor: Lead grade is very low \(122 ppm\). Evidence · table > 122 ppm Context: 7.62 #### Tags used in scoring **True Width Disclosed** Polarity: positive Definition: Actual thickness perpendicular to structure is stated, not just downhole length. Why it applies: true\_width\_m is 5.49 **QA/QC Disclosed** Polarity: positive Definition: Release includes QA/QC disclosure — certified lab, QP sign-off, or stated methods \(blanks, standards, duplicates\). Why it applies: qaqc\_disclosed is true **Cut-off Undisclosed** Polarity: negative Definition: High-grade interval reported without stating the cut-off grade used for compositing. Why it applies: no cutoff\_grade was stated **Infill Drilling** Polarity: neutral Definition: Confirmatory drilling to raise resource confidence, not new discovery. Why it applies: drill\_program\_type is "mixed" **Nearology Play** Polarity: neutral Definition: Value premise rests on proximity to a known deposit rather than own results. Why it applies: proximity is offered as the value premise: "The Company's expanded land position now totals approximately 13,061 acres, or roughly twenty square miles, following th" ### SM26-056 [Link to this fact](https://atlas-staging.minestarters.com/news/thunder-mountain-gold-advances-ag-au-cu-pb-zn-massive-sulfide-resource-expansion--da3cdd1a-bf1d-4d62-a181-c7b678a527a6#fact-drill-facts-29) South Mountain · zinc #### Identity - Hole ID: SM26-056 - Project: South Mountain - Commodity: zinc - Region: usa\_id - Reported Region: usa\_id - Ticker: THM #### Geometry - Grade: 1.95 - Grade Unit: % - Intercept: 7.62 m - True Width: 5.49 m - From: 125.88 m - To: 133.5 m - Hole Depth: 169 m - Intercept Depth: 125.88 m #### Classification - Deposit Type: other - Program: mixed - Sample Type: drill - Group ID: SM26-056:125.88-133.5 - Mining Method: unknown #### Location - Easting: 507036 - Northing: 4732144 - CRS: WGS84 \(meters\) - Azimuth: 335 ° - Dip: -85 ° - Loc. Confidence: high - Loc. Source: document #### QA/QC - Laboratory: MSA Labs - QA/QC Disclosed: Yes - QP Signed: Yes - QA/QC Methods: standards, blanks, duplicates #### Review - Needs Review: No - Interp. Status: scored - Historical: No #### Dates - Event date: 2026-09-17T00:00:00.000Z Reasoning: This high-grade zinc significantly enhances the value of the intercept within the polymetallic system. - Positive factor: High-grade zinc for a polymetallic deposit. - Positive factor: Good estimated true width. Evidence · table > 1.95 % Context: 7.62 #### Tags used in scoring **True Width Disclosed** Polarity: positive Definition: Actual thickness perpendicular to structure is stated, not just downhole length. Why it applies: true\_width\_m is 5.49 **QA/QC Disclosed** Polarity: positive Definition: Release includes QA/QC disclosure — certified lab, QP sign-off, or stated methods \(blanks, standards, duplicates\). Why it applies: qaqc\_disclosed is true **Cut-off Undisclosed** Polarity: negative Definition: High-grade interval reported without stating the cut-off grade used for compositing. Why it applies: no cutoff\_grade was stated **Infill Drilling** Polarity: neutral Definition: Confirmatory drilling to raise resource confidence, not new discovery. Why it applies: drill\_program\_type is "mixed" **Nearology Play** Polarity: neutral Definition: Value premise rests on proximity to a known deposit rather than own results. Why it applies: proximity is offered as the value premise: "The Company's expanded land position now totals approximately 13,061 acres, or roughly twenty square miles, following th" ### SM26-057 [Link to this fact](https://atlas-staging.minestarters.com/news/thunder-mountain-gold-advances-ag-au-cu-pb-zn-massive-sulfide-resource-expansion--da3cdd1a-bf1d-4d62-a181-c7b678a527a6#fact-drill-facts-30) South Mountain · silver #### Identity - Hole ID: SM26-057 - Project: South Mountain - Commodity: silver - Region: usa\_id - Reported Region: usa\_id - Ticker: THM #### Geometry - Grade: 451 - Grade Unit: g/t - Intercept: 2.11 m - True Width: 1.98 m - From: 40.23 m - To: 42.34 m - Hole Depth: 124 m - Intercept Depth: 40.23 m #### Classification - Deposit Type: other - Program: mixed - Sample Type: drill - Group ID: SM26-057:40.23-42.34 - Mining Method: unknown #### Location - Easting: 507036 - Northing: 4732144 - CRS: WGS84 \(meters\) - Azimuth: 335 ° - Dip: -64 ° - Loc. Confidence: high - Loc. Source: document #### QA/QC - Laboratory: MSA Labs - QA/QC Disclosed: Yes - QP Signed: Yes - QA/QC Methods: standards, blanks, duplicates #### Review - Needs Review: No - Interp. Status: scored - Historical: No #### Dates - Event date: 2026-09-17T00:00:00.000Z Reasoning: This intercept shows an exceptional silver grade over a good true width, representing a bonanza-grade zone. - Positive factor: Exceptional silver grade over a good true width. - Positive factor: Indicates very high-grade mineralization. - Positive factor: Part of a program expanding known mineralization. Evidence · table > 451 Context: 2.11 #### Tags used in scoring **True Width Disclosed** Polarity: positive Definition: Actual thickness perpendicular to structure is stated, not just downhole length. Why it applies: true\_width\_m is 1.98 **QA/QC Disclosed** Polarity: positive Definition: Release includes QA/QC disclosure — certified lab, QP sign-off, or stated methods \(blanks, standards, duplicates\). Why it applies: qaqc\_disclosed is true **Cut-off Undisclosed** Polarity: negative Definition: High-grade interval reported without stating the cut-off grade used for compositing. Why it applies: no cutoff\_grade was stated **Infill Drilling** Polarity: neutral Definition: Confirmatory drilling to raise resource confidence, not new discovery. Why it applies: drill\_program\_type is "mixed" **Nearology Play** Polarity: neutral Definition: Value premise rests on proximity to a known deposit rather than own results. Why it applies: proximity is offered as the value premise: "The Company's expanded land position now totals approximately 13,061 acres, or roughly twenty square miles, following th" ### SM26-057 [Link to this fact](https://atlas-staging.minestarters.com/news/thunder-mountain-gold-advances-ag-au-cu-pb-zn-massive-sulfide-resource-expansion--da3cdd1a-bf1d-4d62-a181-c7b678a527a6#fact-drill-facts-31) South Mountain · gold #### Identity - Hole ID: SM26-057 - Project: South Mountain - Commodity: gold - Region: usa\_id - Reported Region: usa\_id - Ticker: THM #### Geometry - Grade: 1.51 - Grade Unit: g/t - Intercept: 2.11 m - True Width: 1.98 m - From: 40.23 m - To: 42.34 m - Hole Depth: 124 m - Intercept Depth: 40.23 m #### Classification - Deposit Type: other - Program: mixed - Sample Type: drill - Group ID: SM26-057:40.23-42.34 - Mining Method: unknown #### Location - Easting: 507036 - Northing: 4732144 - CRS: WGS84 \(meters\) - Azimuth: 335 ° - Dip: -64 ° - Loc. Confidence: high - Loc. Source: document #### QA/QC - Laboratory: MSA Labs - QA/QC Disclosed: Yes - QP Signed: Yes - QA/QC Methods: standards, blanks, duplicates #### Review - Needs Review: No - Interp. Status: scored - Historical: No #### Dates - Event date: 2026-09-17T00:00:00.000Z Reasoning: This strong gold grade significantly enhances the value of the intercept within the polymetallic system. - Positive factor: Strong gold grade for a polymetallic deposit. - Positive factor: Good estimated true width. Evidence · table > 1.510 Context: 2.11 #### Tags used in scoring **True Width Disclosed** Polarity: positive Definition: Actual thickness perpendicular to structure is stated, not just downhole length. Why it applies: true\_width\_m is 1.98 **QA/QC Disclosed** Polarity: positive Definition: Release includes QA/QC disclosure — certified lab, QP sign-off, or stated methods \(blanks, standards, duplicates\). Why it applies: qaqc\_disclosed is true **Cut-off Undisclosed** Polarity: negative Definition: High-grade interval reported without stating the cut-off grade used for compositing. Why it applies: no cutoff\_grade was stated **Infill Drilling** Polarity: neutral Definition: Confirmatory drilling to raise resource confidence, not new discovery. Why it applies: drill\_program\_type is "mixed" **Nearology Play** Polarity: neutral Definition: Value premise rests on proximity to a known deposit rather than own results. Why it applies: proximity is offered as the value premise: "The Company's expanded land position now totals approximately 13,061 acres, or roughly twenty square miles, following th" ### SM26-057 [Link to this fact](https://atlas-staging.minestarters.com/news/thunder-mountain-gold-advances-ag-au-cu-pb-zn-massive-sulfide-resource-expansion--da3cdd1a-bf1d-4d62-a181-c7b678a527a6#fact-drill-facts-32) South Mountain · copper #### Identity - Hole ID: SM26-057 - Project: South Mountain - Commodity: copper - Region: usa\_id - Reported Region: usa\_id - Ticker: THM #### Geometry - Grade: 0.0201 - Grade Unit: % - Intercept: 2.11 m - True Width: 1.98 m - From: 40.23 m - To: 42.34 m - Hole Depth: 124 m - Intercept Depth: 40.23 m #### Classification - Deposit Type: other - Program: mixed - Sample Type: drill - Group ID: SM26-057:40.23-42.34 - Mining Method: unknown #### Location - Easting: 507036 - Northing: 4732144 - CRS: WGS84 \(meters\) - Azimuth: 335 ° - Dip: -64 ° - Loc. Confidence: high - Loc. Source: document #### QA/QC - Laboratory: MSA Labs - QA/QC Disclosed: Yes - QP Signed: Yes - QA/QC Methods: standards, blanks, duplicates #### Review - Needs Review: No - Interp. Status: scored - Historical: No #### Dates - Event date: 2026-09-17T00:00:00.000Z Reasoning: The copper grade is very low, but its presence supports the polymetallic nature of the intercept. - Positive factor: Presence of copper contributes to the polymetallic nature of the deposit. - Negative factor: Copper grade is very low \(201 ppm\). Evidence · table > 201 ppm Context: 2.11 #### Tags used in scoring **True Width Disclosed** Polarity: positive Definition: Actual thickness perpendicular to structure is stated, not just downhole length. Why it applies: true\_width\_m is 1.98 **QA/QC Disclosed** Polarity: positive Definition: Release includes QA/QC disclosure — certified lab, QP sign-off, or stated methods \(blanks, standards, duplicates\). Why it applies: qaqc\_disclosed is true **Cut-off Undisclosed** Polarity: negative Definition: High-grade interval reported without stating the cut-off grade used for compositing. Why it applies: no cutoff\_grade was stated **Infill Drilling** Polarity: neutral Definition: Confirmatory drilling to raise resource confidence, not new discovery. Why it applies: drill\_program\_type is "mixed" **Nearology Play** Polarity: neutral Definition: Value premise rests on proximity to a known deposit rather than own results. Why it applies: proximity is offered as the value premise: "The Company's expanded land position now totals approximately 13,061 acres, or roughly twenty square miles, following th" ### SM26-057 [Link to this fact](https://atlas-staging.minestarters.com/news/thunder-mountain-gold-advances-ag-au-cu-pb-zn-massive-sulfide-resource-expansion--da3cdd1a-bf1d-4d62-a181-c7b678a527a6#fact-drill-facts-33) South Mountain · lead #### Identity - Hole ID: SM26-057 - Project: South Mountain - Commodity: lead - Region: usa\_id - Reported Region: usa\_id - Ticker: THM #### Geometry - Grade: 4.44 - Grade Unit: % - Intercept: 2.11 m - True Width: 1.98 m - From: 40.23 m - To: 42.34 m - Hole Depth: 124 m - Intercept Depth: 40.23 m #### Classification - Deposit Type: other - Program: mixed - Sample Type: drill - Group ID: SM26-057:40.23-42.34 - Mining Method: unknown #### Location - Easting: 507036 - Northing: 4732144 - CRS: WGS84 \(meters\) - Azimuth: 335 ° - Dip: -64 ° - Loc. Confidence: high - Loc. Source: document #### QA/QC - Laboratory: MSA Labs - QA/QC Disclosed: Yes - QP Signed: Yes - QA/QC Methods: standards, blanks, duplicates #### Review - Needs Review: No - Interp. Status: scored - Historical: No #### Dates - Event date: 2026-09-17T00:00:00.000Z Reasoning: This high-grade lead significantly enhances the value of the intercept within the polymetallic system. - Positive factor: High-grade lead for a polymetallic deposit. - Positive factor: Good estimated true width. Evidence · table > 4.44 % Context: 2.11 #### Tags used in scoring **True Width Disclosed** Polarity: positive Definition: Actual thickness perpendicular to structure is stated, not just downhole length. Why it applies: true\_width\_m is 1.98 **QA/QC Disclosed** Polarity: positive Definition: Release includes QA/QC disclosure — certified lab, QP sign-off, or stated methods \(blanks, standards, duplicates\). Why it applies: qaqc\_disclosed is true **Cut-off Undisclosed** Polarity: negative Definition: High-grade interval reported without stating the cut-off grade used for compositing. Why it applies: no cutoff\_grade was stated **Infill Drilling** Polarity: neutral Definition: Confirmatory drilling to raise resource confidence, not new discovery. Why it applies: drill\_program\_type is "mixed" **Nearology Play** Polarity: neutral Definition: Value premise rests on proximity to a known deposit rather than own results. Why it applies: proximity is offered as the value premise: "The Company's expanded land position now totals approximately 13,061 acres, or roughly twenty square miles, following th" ### SM26-057 [Link to this fact](https://atlas-staging.minestarters.com/news/thunder-mountain-gold-advances-ag-au-cu-pb-zn-massive-sulfide-resource-expansion--da3cdd1a-bf1d-4d62-a181-c7b678a527a6#fact-drill-facts-34) South Mountain · zinc #### Identity - Hole ID: SM26-057 - Project: South Mountain - Commodity: zinc - Region: usa\_id - Reported Region: usa\_id - Ticker: THM #### Geometry - Grade: 1.64 - Grade Unit: % - Intercept: 2.11 m - True Width: 1.98 m - From: 40.23 m - To: 42.34 m - Hole Depth: 124 m - Intercept Depth: 40.23 m #### Classification - Deposit Type: other - Program: mixed - Sample Type: drill - Group ID: SM26-057:40.23-42.34 - Mining Method: unknown #### Location - Easting: 507036 - Northing: 4732144 - CRS: WGS84 \(meters\) - Azimuth: 335 ° - Dip: -64 ° - Loc. Confidence: high - Loc. Source: document #### QA/QC - Laboratory: MSA Labs - QA/QC Disclosed: Yes - QP Signed: Yes - QA/QC Methods: standards, blanks, duplicates #### Review - Needs Review: No - Interp. Status: scored - Historical: No #### Dates - Event date: 2026-09-17T00:00:00.000Z Reasoning: This strong zinc grade significantly enhances the value of the intercept within the polymetallic system. - Positive factor: Strong zinc grade for a polymetallic deposit. - Positive factor: Good estimated true width. Evidence · table > 1.64 % Context: 2.11 #### Tags used in scoring **True Width Disclosed** Polarity: positive Definition: Actual thickness perpendicular to structure is stated, not just downhole length. Why it applies: true\_width\_m is 1.98 **QA/QC Disclosed** Polarity: positive Definition: Release includes QA/QC disclosure — certified lab, QP sign-off, or stated methods \(blanks, standards, duplicates\). Why it applies: qaqc\_disclosed is true **Cut-off Undisclosed** Polarity: negative Definition: High-grade interval reported without stating the cut-off grade used for compositing. Why it applies: no cutoff\_grade was stated **Infill Drilling** Polarity: neutral Definition: Confirmatory drilling to raise resource confidence, not new discovery. Why it applies: drill\_program\_type is "mixed" **Nearology Play** Polarity: neutral Definition: Value premise rests on proximity to a known deposit rather than own results. Why it applies: proximity is offered as the value premise: "The Company's expanded land position now totals approximately 13,061 acres, or roughly twenty square miles, following th" ### SM26-057 [Link to this fact](https://atlas-staging.minestarters.com/news/thunder-mountain-gold-advances-ag-au-cu-pb-zn-massive-sulfide-resource-expansion--da3cdd1a-bf1d-4d62-a181-c7b678a527a6#fact-drill-facts-35) South Mountain · silver #### Identity - Hole ID: SM26-057 - Project: South Mountain - Commodity: silver - Region: usa\_id - Reported Region: usa\_id - Ticker: THM #### Geometry - Grade: 117 - Grade Unit: g/t - Intercept: 13.63 m - True Width: 12.81 m - From: 99.79 m - To: 113.42 m - Hole Depth: 124 m - Intercept Depth: 40.23 m #### Classification - Deposit Type: other - Program: mixed - Sample Type: drill - Group ID: SM26-057:99.79-113.42 - Mining Method: unknown #### Location - Easting: 507036 - Northing: 4732144 - CRS: WGS84 \(meters\) - Azimuth: 335 ° - Dip: -64 ° - Loc. Confidence: high - Loc. Source: document #### QA/QC - Laboratory: MSA Labs - QA/QC Disclosed: Yes - QP Signed: Yes - QA/QC Methods: standards, blanks, duplicates #### Review - Needs Review: No - Interp. Status: scored - Historical: No #### Dates - Event date: 2026-09-17T00:00:00.000Z Reasoning: This broad intercept with a strong silver grade and significant true width is a material positive result for resource expansion. - Positive factor: Strong silver grade over a broad interval. - Positive factor: Significant estimated true width. - Positive factor: Part of a program expanding known mineralization. Evidence · table > 117 Context: 13.63 #### Tags used in scoring **True Width Disclosed** Polarity: positive Definition: Actual thickness perpendicular to structure is stated, not just downhole length. Why it applies: true\_width\_m is 12.81 **QA/QC Disclosed** Polarity: positive Definition: Release includes QA/QC disclosure — certified lab, QP sign-off, or stated methods \(blanks, standards, duplicates\). Why it applies: qaqc\_disclosed is true **Cut-off Undisclosed** Polarity: negative Definition: High-grade interval reported without stating the cut-off grade used for compositing. Why it applies: no cutoff\_grade was stated **Infill Drilling** Polarity: neutral Definition: Confirmatory drilling to raise resource confidence, not new discovery. Why it applies: drill\_program\_type is "mixed" **Nearology Play** Polarity: neutral Definition: Value premise rests on proximity to a known deposit rather than own results. Why it applies: proximity is offered as the value premise: "The Company's expanded land position now totals approximately 13,061 acres, or roughly twenty square miles, following th" ### SM26-057 [Link to this fact](https://atlas-staging.minestarters.com/news/thunder-mountain-gold-advances-ag-au-cu-pb-zn-massive-sulfide-resource-expansion--da3cdd1a-bf1d-4d62-a181-c7b678a527a6#fact-drill-facts-36) South Mountain · gold #### Identity - Hole ID: SM26-057 - Project: South Mountain - Commodity: gold - Region: usa\_id - Reported Region: usa\_id - Ticker: THM #### Geometry - Grade: 0.086 - Grade Unit: g/t - Intercept: 13.63 m - True Width: 12.81 m - From: 99.79 m - To: 113.42 m - Hole Depth: 124 m - Intercept Depth: 40.23 m #### Classification - Deposit Type: other - Program: mixed - Sample Type: drill - Group ID: SM26-057:99.79-113.42 - Mining Method: unknown #### Location - Easting: 507036 - Northing: 4732144 - CRS: WGS84 \(meters\) - Azimuth: 335 ° - Dip: -64 ° - Loc. Confidence: high - Loc. Source: document #### QA/QC - Laboratory: MSA Labs - QA/QC Disclosed: Yes - QP Signed: Yes - QA/QC Methods: standards, blanks, duplicates #### Review - Needs Review: No - Interp. Status: scored - Historical: No #### Dates - Event date: 2026-09-17T00:00:00.000Z Reasoning: The gold grade is low but contributes to the overall polymetallic nature of the broad intercept. - Positive factor: Associated gold mineralization adds value to the polymetallic intercept. Evidence · table > 0.086 Context: 13.63 #### Tags used in scoring **True Width Disclosed** Polarity: positive Definition: Actual thickness perpendicular to structure is stated, not just downhole length. Why it applies: true\_width\_m is 12.81 **QA/QC Disclosed** Polarity: positive Definition: Release includes QA/QC disclosure — certified lab, QP sign-off, or stated methods \(blanks, standards, duplicates\). Why it applies: qaqc\_disclosed is true **Cut-off Undisclosed** Polarity: negative Definition: High-grade interval reported without stating the cut-off grade used for compositing. Why it applies: no cutoff\_grade was stated **Infill Drilling** Polarity: neutral Definition: Confirmatory drilling to raise resource confidence, not new discovery. Why it applies: drill\_program\_type is "mixed" **Nearology Play** Polarity: neutral Definition: Value premise rests on proximity to a known deposit rather than own results. Why it applies: proximity is offered as the value premise: "The Company's expanded land position now totals approximately 13,061 acres, or roughly twenty square miles, following th" ### SM26-057 [Link to this fact](https://atlas-staging.minestarters.com/news/thunder-mountain-gold-advances-ag-au-cu-pb-zn-massive-sulfide-resource-expansion--da3cdd1a-bf1d-4d62-a181-c7b678a527a6#fact-drill-facts-37) South Mountain · copper #### Identity - Hole ID: SM26-057 - Project: South Mountain - Commodity: copper - Region: usa\_id - Reported Region: usa\_id - Ticker: THM #### Geometry - Grade: 0.81 - Grade Unit: % - Intercept: 13.63 m - True Width: 12.81 m - From: 99.79 m - To: 113.42 m - Hole Depth: 124 m - Intercept Depth: 40.23 m #### Classification - Deposit Type: other - Program: mixed - Sample Type: drill - Group ID: SM26-057:99.79-113.42 - Mining Method: unknown #### Location - Easting: 507036 - Northing: 4732144 - CRS: WGS84 \(meters\) - Azimuth: 335 ° - Dip: -64 ° - Loc. Confidence: high - Loc. Source: document #### QA/QC - Laboratory: MSA Labs - QA/QC Disclosed: Yes - QP Signed: Yes - QA/QC Methods: standards, blanks, duplicates #### Review - Needs Review: No - Interp. Status: scored - Historical: No #### Dates - Event date: 2026-09-17T00:00:00.000Z Reasoning: The copper grade is strong for a polymetallic deposit and contributes significantly to the broad intercept's value. - Positive factor: Good copper grade for a polymetallic deposit. - Positive factor: Significant estimated true width. Evidence · table > 0.81 % Context: 13.63 #### Tags used in scoring **True Width Disclosed** Polarity: positive Definition: Actual thickness perpendicular to structure is stated, not just downhole length. Why it applies: true\_width\_m is 12.81 **QA/QC Disclosed** Polarity: positive Definition: Release includes QA/QC disclosure — certified lab, QP sign-off, or stated methods \(blanks, standards, duplicates\). Why it applies: qaqc\_disclosed is true **Cut-off Undisclosed** Polarity: negative Definition: High-grade interval reported without stating the cut-off grade used for compositing. Why it applies: no cutoff\_grade was stated **Infill Drilling** Polarity: neutral Definition: Confirmatory drilling to raise resource confidence, not new discovery. Why it applies: drill\_program\_type is "mixed" **Nearology Play** Polarity: neutral Definition: Value premise rests on proximity to a known deposit rather than own results. Why it applies: proximity is offered as the value premise: "The Company's expanded land position now totals approximately 13,061 acres, or roughly twenty square miles, following th" ### SM26-057 [Link to this fact](https://atlas-staging.minestarters.com/news/thunder-mountain-gold-advances-ag-au-cu-pb-zn-massive-sulfide-resource-expansion--da3cdd1a-bf1d-4d62-a181-c7b678a527a6#fact-drill-facts-38) South Mountain · lead #### Identity - Hole ID: SM26-057 - Project: South Mountain - Commodity: lead - Region: usa\_id - Reported Region: usa\_id - Ticker: THM #### Geometry - Grade: 0.0352 - Grade Unit: % - Intercept: 13.63 m - True Width: 12.81 m - From: 99.79 m - To: 113.42 m - Hole Depth: 124 m - Intercept Depth: 40.23 m #### Classification - Deposit Type: other - Program: mixed - Sample Type: drill - Group ID: SM26-057:99.79-113.42 - Mining Method: unknown #### Location - Easting: 507036 - Northing: 4732144 - CRS: WGS84 \(meters\) - Azimuth: 335 ° - Dip: -64 ° - Loc. Confidence: high - Loc. Source: document #### QA/QC - Laboratory: MSA Labs - QA/QC Disclosed: Yes - QP Signed: Yes - QA/QC Methods: standards, blanks, duplicates #### Review - Needs Review: No - Interp. Status: scored - Historical: No #### Dates - Event date: 2026-09-17T00:00:00.000Z Reasoning: The lead grade is very low, but its presence supports the polymetallic nature of the broad intercept. - Positive factor: Presence of lead contributes to the polymetallic nature of the deposit. - Negative factor: Lead grade is very low \(352 ppm\). Evidence · table > 352 ppm Context: 13.63 #### Tags used in scoring **True Width Disclosed** Polarity: positive Definition: Actual thickness perpendicular to structure is stated, not just downhole length. Why it applies: true\_width\_m is 12.81 **QA/QC Disclosed** Polarity: positive Definition: Release includes QA/QC disclosure — certified lab, QP sign-off, or stated methods \(blanks, standards, duplicates\). Why it applies: qaqc\_disclosed is true **Cut-off Undisclosed** Polarity: negative Definition: High-grade interval reported without stating the cut-off grade used for compositing. Why it applies: no cutoff\_grade was stated **Infill Drilling** Polarity: neutral Definition: Confirmatory drilling to raise resource confidence, not new discovery. Why it applies: drill\_program\_type is "mixed" **Nearology Play** Polarity: neutral Definition: Value premise rests on proximity to a known deposit rather than own results. Why it applies: proximity is offered as the value premise: "The Company's expanded land position now totals approximately 13,061 acres, or roughly twenty square miles, following th" ### SM26-057 [Link to this fact](https://atlas-staging.minestarters.com/news/thunder-mountain-gold-advances-ag-au-cu-pb-zn-massive-sulfide-resource-expansion--da3cdd1a-bf1d-4d62-a181-c7b678a527a6#fact-drill-facts-39) South Mountain · zinc #### Identity - Hole ID: SM26-057 - Project: South Mountain - Commodity: zinc - Region: usa\_id - Reported Region: usa\_id - Ticker: THM #### Geometry - Grade: 0.94 - Grade Unit: % - Intercept: 13.63 m - True Width: 12.81 m - From: 99.79 m - To: 113.42 m - Hole Depth: 124 m - Intercept Depth: 40.23 m #### Classification - Deposit Type: other - Program: mixed - Sample Type: drill - Group ID: SM26-057:99.79-113.42 - Mining Method: unknown #### Location - Easting: 507036 - Northing: 4732144 - CRS: WGS84 \(meters\) - Azimuth: 335 ° - Dip: -64 ° - Loc. Confidence: high - Loc. Source: document #### QA/QC - Laboratory: MSA Labs - QA/QC Disclosed: Yes - QP Signed: Yes - QA/QC Methods: standards, blanks, duplicates #### Review - Needs Review: No - Interp. Status: scored - Historical: No #### Dates - Event date: 2026-09-17T00:00:00.000Z Reasoning: The zinc grade is strong and contributes to the overall polymetallic nature of the broad intercept. - Positive factor: Good zinc grade over a broad interval. - Positive factor: Significant estimated true width. Evidence · table > 0.94 % Context: 13.63 #### Tags used in scoring **True Width Disclosed** Polarity: positive Definition: Actual thickness perpendicular to structure is stated, not just downhole length. Why it applies: true\_width\_m is 12.81 **QA/QC Disclosed** Polarity: positive Definition: Release includes QA/QC disclosure — certified lab, QP sign-off, or stated methods \(blanks, standards, duplicates\). Why it applies: qaqc\_disclosed is true **Cut-off Undisclosed** Polarity: negative Definition: High-grade interval reported without stating the cut-off grade used for compositing. Why it applies: no cutoff\_grade was stated **Infill Drilling** Polarity: neutral Definition: Confirmatory drilling to raise resource confidence, not new discovery. Why it applies: drill\_program\_type is "mixed" **Nearology Play** Polarity: neutral Definition: Value premise rests on proximity to a known deposit rather than own results. Why it applies: proximity is offered as the value premise: "The Company's expanded land position now totals approximately 13,061 acres, or roughly twenty square miles, following th" ### SM26-057 [Link to this fact](https://atlas-staging.minestarters.com/news/thunder-mountain-gold-advances-ag-au-cu-pb-zn-massive-sulfide-resource-expansion--da3cdd1a-bf1d-4d62-a181-c7b678a527a6#fact-drill-facts-40) South Mountain · silver #### Identity - Hole ID: SM26-057 - Project: South Mountain - Commodity: silver - Region: usa\_id - Reported Region: usa\_id - Ticker: THM #### Geometry - Grade: 234 - Grade Unit: g/t - Intercept: 4.67 m - True Width: 4.39 m - From: 101.19 m - To: 105.86 m - Hole Depth: 124 m - Intercept Depth: 40.23 m #### Classification - Deposit Type: other - Program: mixed - Sample Type: drill - Group ID: SM26-057:101.19-105.86 - Mining Method: unknown #### Location - Easting: 507036 - Northing: 4732144 - CRS: WGS84 \(meters\) - Azimuth: 335 ° - Dip: -64 ° - Loc. Confidence: high - Loc. Source: document #### QA/QC - Laboratory: MSA Labs - QA/QC Disclosed: Yes - QP Signed: Yes - QA/QC Methods: standards, blanks, duplicates #### Review - Needs Review: No - Interp. Status: scored - Historical: No #### Dates - Event date: 2026-09-17T00:00:00.000Z Reasoning: This exceptional silver sub-interval demonstrates very strong mineralization within the broader intercept, significantly enhancing its materiality. - Positive factor: Exceptional silver grade in a significant sub-interval. - Positive factor: Good estimated true width. - Positive factor: Indicates very high-grade zones within the broader mineralization. Evidence · table > 234 Context: 4.67 #### Tags used in scoring **True Width Disclosed** Polarity: positive Definition: Actual thickness perpendicular to structure is stated, not just downhole length. Why it applies: true\_width\_m is 4.39 **QA/QC Disclosed** Polarity: positive Definition: Release includes QA/QC disclosure — certified lab, QP sign-off, or stated methods \(blanks, standards, duplicates\). Why it applies: qaqc\_disclosed is true **Cut-off Undisclosed** Polarity: negative Definition: High-grade interval reported without stating the cut-off grade used for compositing. Why it applies: no cutoff\_grade was stated **Infill Drilling** Polarity: neutral Definition: Confirmatory drilling to raise resource confidence, not new discovery. Why it applies: drill\_program\_type is "mixed" **Nearology Play** Polarity: neutral Definition: Value premise rests on proximity to a known deposit rather than own results. Why it applies: proximity is offered as the value premise: "The Company's expanded land position now totals approximately 13,061 acres, or roughly twenty square miles, following th" ### SM26-057 [Link to this fact](https://atlas-staging.minestarters.com/news/thunder-mountain-gold-advances-ag-au-cu-pb-zn-massive-sulfide-resource-expansion--da3cdd1a-bf1d-4d62-a181-c7b678a527a6#fact-drill-facts-41) South Mountain · gold #### Identity - Hole ID: SM26-057 - Project: South Mountain - Commodity: gold - Region: usa\_id - Reported Region: usa\_id - Ticker: THM #### Geometry - Grade: 0.196 - Grade Unit: g/t - Intercept: 4.67 m - True Width: 4.39 m - From: 101.19 m - To: 105.86 m - Hole Depth: 124 m - Intercept Depth: 40.23 m #### Classification - Deposit Type: other - Program: mixed - Sample Type: drill - Group ID: SM26-057:101.19-105.86 - Mining Method: unknown #### Location - Easting: 507036 - Northing: 4732144 - CRS: WGS84 \(meters\) - Azimuth: 335 ° - Dip: -64 ° - Loc. Confidence: high - Loc. Source: document #### QA/QC - Laboratory: MSA Labs - QA/QC Disclosed: Yes - QP Signed: Yes - QA/QC Methods: standards, blanks, duplicates #### Review - Needs Review: No - Interp. Status: scored - Historical: No #### Dates - Event date: 2026-09-17T00:00:00.000Z Reasoning: The gold grade is moderate and contributes to the overall polymetallic nature of the sub-interval. - Positive factor: Associated gold mineralization adds value to the polymetallic intercept. Evidence · table > 0.196 Context: 4.67 #### Tags used in scoring **True Width Disclosed** Polarity: positive Definition: Actual thickness perpendicular to structure is stated, not just downhole length. Why it applies: true\_width\_m is 4.39 **QA/QC Disclosed** Polarity: positive Definition: Release includes QA/QC disclosure — certified lab, QP sign-off, or stated methods \(blanks, standards, duplicates\). Why it applies: qaqc\_disclosed is true **Cut-off Undisclosed** Polarity: negative Definition: High-grade interval reported without stating the cut-off grade used for compositing. Why it applies: no cutoff\_grade was stated **Infill Drilling** Polarity: neutral Definition: Confirmatory drilling to raise resource confidence, not new discovery. Why it applies: drill\_program\_type is "mixed" **Nearology Play** Polarity: neutral Definition: Value premise rests on proximity to a known deposit rather than own results. Why it applies: proximity is offered as the value premise: "The Company's expanded land position now totals approximately 13,061 acres, or roughly twenty square miles, following th" ### SM26-057 [Link to this fact](https://atlas-staging.minestarters.com/news/thunder-mountain-gold-advances-ag-au-cu-pb-zn-massive-sulfide-resource-expansion--da3cdd1a-bf1d-4d62-a181-c7b678a527a6#fact-drill-facts-42) South Mountain · copper #### Identity - Hole ID: SM26-057 - Project: South Mountain - Commodity: copper - Region: usa\_id - Reported Region: usa\_id - Ticker: THM #### Geometry - Grade: 2.12 - Grade Unit: % - Intercept: 4.67 m - True Width: 4.39 m - From: 101.19 m - To: 105.86 m - Hole Depth: 124 m - Intercept Depth: 40.23 m #### Classification - Deposit Type: other - Program: mixed - Sample Type: drill - Group ID: SM26-057:101.19-105.86 - Mining Method: unknown #### Location - Easting: 507036 - Northing: 4732144 - CRS: WGS84 \(meters\) - Azimuth: 335 ° - Dip: -64 ° - Loc. Confidence: high - Loc. Source: document #### QA/QC - Laboratory: MSA Labs - QA/QC Disclosed: Yes - QP Signed: Yes - QA/QC Methods: standards, blanks, duplicates #### Review - Needs Review: No - Interp. Status: scored - Historical: No #### Dates - Event date: 2026-09-17T00:00:00.000Z Reasoning: This exceptional copper grade significantly enhances the value of the sub-interval within the polymetallic system. - Positive factor: Exceptional copper grade for a polymetallic deposit. - Positive factor: Good estimated true width. Evidence · table > 2.12 % Context: 4.67 #### Tags used in scoring **True Width Disclosed** Polarity: positive Definition: Actual thickness perpendicular to structure is stated, not just downhole length. Why it applies: true\_width\_m is 4.39 **QA/QC Disclosed** Polarity: positive Definition: Release includes QA/QC disclosure — certified lab, QP sign-off, or stated methods \(blanks, standards, duplicates\). Why it applies: qaqc\_disclosed is true **Cut-off Undisclosed** Polarity: negative Definition: High-grade interval reported without stating the cut-off grade used for compositing. Why it applies: no cutoff\_grade was stated **Infill Drilling** Polarity: neutral Definition: Confirmatory drilling to raise resource confidence, not new discovery. Why it applies: drill\_program\_type is "mixed" **Nearology Play** Polarity: neutral Definition: Value premise rests on proximity to a known deposit rather than own results. Why it applies: proximity is offered as the value premise: "The Company's expanded land position now totals approximately 13,061 acres, or roughly twenty square miles, following th" ### SM26-057 [Link to this fact](https://atlas-staging.minestarters.com/news/thunder-mountain-gold-advances-ag-au-cu-pb-zn-massive-sulfide-resource-expansion--da3cdd1a-bf1d-4d62-a181-c7b678a527a6#fact-drill-facts-43) South Mountain · lead #### Identity - Hole ID: SM26-057 - Project: South Mountain - Commodity: lead - Region: usa\_id - Reported Region: usa\_id - Ticker: THM #### Geometry - Grade: 0.0454 - Grade Unit: % - Intercept: 4.67 m - True Width: 4.39 m - From: 101.19 m - To: 105.86 m - Hole Depth: 124 m - Intercept Depth: 40.23 m #### Classification - Deposit Type: other - Program: mixed - Sample Type: drill - Group ID: SM26-057:101.19-105.86 - Mining Method: unknown #### Location - Easting: 507036 - Northing: 4732144 - CRS: WGS84 \(meters\) - Azimuth: 335 ° - Dip: -64 ° - Loc. Confidence: high - Loc. Source: document #### QA/QC - Laboratory: MSA Labs - QA/QC Disclosed: Yes - QP Signed: Yes - QA/QC Methods: standards, blanks, duplicates #### Review - Needs Review: No - Interp. Status: scored - Historical: No #### Dates - Event date: 2026-09-17T00:00:00.000Z Reasoning: The lead grade is very low, but its presence supports the polymetallic nature of the sub-interval. - Positive factor: Presence of lead contributes to the polymetallic nature of the deposit. - Negative factor: Lead grade is very low \(454 ppm\). Evidence · table > 454 ppm Context: 4.67 #### Tags used in scoring **True Width Disclosed** Polarity: positive Definition: Actual thickness perpendicular to structure is stated, not just downhole length. Why it applies: true\_width\_m is 4.39 **QA/QC Disclosed** Polarity: positive Definition: Release includes QA/QC disclosure — certified lab, QP sign-off, or stated methods \(blanks, standards, duplicates\). Why it applies: qaqc\_disclosed is true **Cut-off Undisclosed** Polarity: negative Definition: High-grade interval reported without stating the cut-off grade used for compositing. Why it applies: no cutoff\_grade was stated **Infill Drilling** Polarity: neutral Definition: Confirmatory drilling to raise resource confidence, not new discovery. Why it applies: drill\_program\_type is "mixed" **Nearology Play** Polarity: neutral Definition: Value premise rests on proximity to a known deposit rather than own results. Why it applies: proximity is offered as the value premise: "The Company's expanded land position now totals approximately 13,061 acres, or roughly twenty square miles, following th" ### SM26-057 [Link to this fact](https://atlas-staging.minestarters.com/news/thunder-mountain-gold-advances-ag-au-cu-pb-zn-massive-sulfide-resource-expansion--da3cdd1a-bf1d-4d62-a181-c7b678a527a6#fact-drill-facts-44) South Mountain · zinc #### Identity - Hole ID: SM26-057 - Project: South Mountain - Commodity: zinc - Region: usa\_id - Reported Region: usa\_id - Ticker: THM #### Geometry - Grade: 2.44 - Grade Unit: % - Intercept: 4.67 m - True Width: 4.39 m - From: 101.19 m - To: 105.86 m - Hole Depth: 124 m - Intercept Depth: 40.23 m #### Classification - Deposit Type: other - Program: mixed - Sample Type: drill - Group ID: SM26-057:101.19-105.86 - Mining Method: unknown #### Location - Easting: 507036 - Northing: 4732144 - CRS: WGS84 \(meters\) - Azimuth: 335 ° - Dip: -64 ° - Loc. Confidence: high - Loc. Source: document #### QA/QC - Laboratory: MSA Labs - QA/QC Disclosed: Yes - QP Signed: Yes - QA/QC Methods: standards, blanks, duplicates #### Review - Needs Review: No - Interp. Status: scored - Historical: No #### Dates - Event date: 2026-09-17T00:00:00.000Z Reasoning: This exceptional zinc grade significantly enhances the value of the sub-interval within the polymetallic system. - Positive factor: Exceptional zinc grade for a polymetallic deposit. - Positive factor: Good estimated true width. Evidence · table > 2.44 % Context: 4.67 #### Tags used in scoring **True Width Disclosed** Polarity: positive Definition: Actual thickness perpendicular to structure is stated, not just downhole length. Why it applies: true\_width\_m is 4.39 **QA/QC Disclosed** Polarity: positive Definition: Release includes QA/QC disclosure — certified lab, QP sign-off, or stated methods \(blanks, standards, duplicates\). Why it applies: qaqc\_disclosed is true **Cut-off Undisclosed** Polarity: negative Definition: High-grade interval reported without stating the cut-off grade used for compositing. Why it applies: no cutoff\_grade was stated **Infill Drilling** Polarity: neutral Definition: Confirmatory drilling to raise resource confidence, not new discovery. Why it applies: drill\_program\_type is "mixed" **Nearology Play** Polarity: neutral Definition: Value premise rests on proximity to a known deposit rather than own results. Why it applies: proximity is offered as the value premise: "The Company's expanded land position now totals approximately 13,061 acres, or roughly twenty square miles, following th" ### and [Link to this fact](https://atlas-staging.minestarters.com/news/thunder-mountain-gold-advances-ag-au-cu-pb-zn-massive-sulfide-resource-expansion--da3cdd1a-bf1d-4d62-a181-c7b678a527a6#fact-drill-facts-45) South Mountain · silver #### Identity - Hole ID: and - Project: South Mountain - Commodity: silver - Region: usa\_id - Reported Region: usa\_id - Ticker: THM #### Geometry - Grade: 86 - Grade Unit: g/t - Intercept: 22.47 m - True Width: 20 m - From: 98.66 m - To: 121.13 m - Intercept Depth: 98.66 m #### Classification - Deposit Type: other - Sample Type: drill - Group ID: and:98.66-121.13 - Mining Method: unknown #### Location - CRS: WGS84 \(meters\) #### QA/QC - Laboratory: MSA Labs - QA/QC Disclosed: Yes - QP Signed: Yes - QA/QC Methods: standards, blanks, duplicates #### Review - Needs Review: No - Interp. Status: scored - Historical: No #### Dates - Event date: 2026-09-17T00:00:00.000Z Reasoning: Expanded from assay table. 86 g/t silver is moderate against the default band \[500, 200, 100, 30\] g/t. Grade×width 1932.4 g/t·m is moderate \(grade alone is weak; the better of the two is used\). - Negative factor: Scored from rubric bands during table expansion, not from document context. Evidence · table > 86 Context: and #### Tags used in scoring **True Width Disclosed** Polarity: positive Definition: Actual thickness perpendicular to structure is stated, not just downhole length. Why it applies: true\_width\_m is 20 **QA/QC Disclosed** Polarity: positive Definition: Release includes QA/QC disclosure — certified lab, QP sign-off, or stated methods \(blanks, standards, duplicates\). Why it applies: qaqc\_disclosed is true **Cut-off Undisclosed** Polarity: negative Definition: High-grade interval reported without stating the cut-off grade used for compositing. Why it applies: no cutoff\_grade was stated **Nearology Play** Polarity: neutral Definition: Value premise rests on proximity to a known deposit rather than own results. Why it applies: proximity is offered as the value premise: "The Company's expanded land position now totals approximately 13,061 acres, or roughly twenty square miles, following th" ### and [Link to this fact](https://atlas-staging.minestarters.com/news/thunder-mountain-gold-advances-ag-au-cu-pb-zn-massive-sulfide-resource-expansion--da3cdd1a-bf1d-4d62-a181-c7b678a527a6#fact-drill-facts-46) South Mountain · gold #### Identity - Hole ID: and - Project: South Mountain - Commodity: gold - Region: usa\_id - Reported Region: usa\_id - Ticker: THM #### Geometry - Grade: 0.105 - Grade Unit: g/t - Intercept: 22.47 m - True Width: 20 m - From: 98.66 m - To: 121.13 m - Intercept Depth: 98.66 m #### Classification - Deposit Type: other - Sample Type: drill - Group ID: and:98.66-121.13 - Mining Method: unknown #### Location - CRS: WGS84 \(meters\) #### QA/QC - Laboratory: MSA Labs - QA/QC Disclosed: Yes - QP Signed: Yes - QA/QC Methods: standards, blanks, duplicates #### Review - Needs Review: No - Interp. Status: scored - Historical: No #### Dates - Event date: 2026-09-17T00:00:00.000Z Reasoning: Expanded from assay table. 0.105 g/t gold is below against the default band \[5, 2, 1, 0.3\] g/t. Grade×width 2.4 g/t·m is below. - Negative factor: 0.105 g/t gold is below the weak threshold \(0.3 g/t\) on the default band. - Negative factor: Scored from rubric bands during table expansion, not from document context. Evidence · table > 0.105 Context: and #### Tags used in scoring **True Width Disclosed** Polarity: positive Definition: Actual thickness perpendicular to structure is stated, not just downhole length. Why it applies: true\_width\_m is 20 **QA/QC Disclosed** Polarity: positive Definition: Release includes QA/QC disclosure — certified lab, QP sign-off, or stated methods \(blanks, standards, duplicates\). Why it applies: qaqc\_disclosed is true **Cut-off Undisclosed** Polarity: negative Definition: High-grade interval reported without stating the cut-off grade used for compositing. Why it applies: no cutoff\_grade was stated **Nearology Play** Polarity: neutral Definition: Value premise rests on proximity to a known deposit rather than own results. Why it applies: proximity is offered as the value premise: "The Company's expanded land position now totals approximately 13,061 acres, or roughly twenty square miles, following th" ### and [Link to this fact](https://atlas-staging.minestarters.com/news/thunder-mountain-gold-advances-ag-au-cu-pb-zn-massive-sulfide-resource-expansion--da3cdd1a-bf1d-4d62-a181-c7b678a527a6#fact-drill-facts-47) South Mountain · copper #### Identity - Hole ID: and - Project: South Mountain - Commodity: copper - Region: usa\_id - Reported Region: usa\_id - Ticker: THM #### Geometry - Grade: 0.36 - Grade Unit: % - Intercept: 22.47 m - True Width: 20 m - From: 98.66 m - To: 121.13 m - Intercept Depth: 98.66 m #### Classification - Deposit Type: other - Sample Type: drill - Group ID: and:98.66-121.13 - Mining Method: unknown #### Location - CRS: WGS84 \(meters\) #### QA/QC - Laboratory: MSA Labs - QA/QC Disclosed: Yes - QP Signed: Yes - QA/QC Methods: standards, blanks, duplicates #### Review - Needs Review: No - Interp. Status: scored - Historical: No #### Dates - Event date: 2026-09-17T00:00:00.000Z Reasoning: Expanded from assay table. 0.36 % copper is weak against the default band \[2.5, 1, 0.5, 0.25\] %. Grade×width 8.1 %·m is below \(grade alone is weak; the better of the two is used\). - Negative factor: Scored from rubric bands during table expansion, not from document context. Evidence · table > 0.36 % Context: and #### Tags used in scoring **True Width Disclosed** Polarity: positive Definition: Actual thickness perpendicular to structure is stated, not just downhole length. Why it applies: true\_width\_m is 20 **QA/QC Disclosed** Polarity: positive Definition: Release includes QA/QC disclosure — certified lab, QP sign-off, or stated methods \(blanks, standards, duplicates\). Why it applies: qaqc\_disclosed is true **Cut-off Undisclosed** Polarity: negative Definition: High-grade interval reported without stating the cut-off grade used for compositing. Why it applies: no cutoff\_grade was stated **Nearology Play** Polarity: neutral Definition: Value premise rests on proximity to a known deposit rather than own results. Why it applies: proximity is offered as the value premise: "The Company's expanded land position now totals approximately 13,061 acres, or roughly twenty square miles, following th" ### and [Link to this fact](https://atlas-staging.minestarters.com/news/thunder-mountain-gold-advances-ag-au-cu-pb-zn-massive-sulfide-resource-expansion--da3cdd1a-bf1d-4d62-a181-c7b678a527a6#fact-drill-facts-48) South Mountain · lead #### Identity - Hole ID: and - Project: South Mountain - Commodity: lead - Region: usa\_id - Reported Region: usa\_id - Ticker: THM #### Geometry - Grade: 310 - Grade Unit: % - Intercept: 22.47 m - True Width: 20 m - From: 98.66 m - To: 121.13 m - Intercept Depth: 98.66 m #### Classification - Deposit Type: other - Sample Type: drill - Group ID: and:98.66-121.13 - Mining Method: unknown #### Location - CRS: WGS84 \(meters\) #### QA/QC - Laboratory: MSA Labs - QA/QC Disclosed: Yes - QP Signed: Yes - QA/QC Methods: standards, blanks, duplicates #### Review - Needs Review: No - Interp. Status: scored - Historical: No #### Dates - Event date: 2026-09-17T00:00:00.000Z Reasoning: Expanded from assay table. 310 % lead is exceptional against the default band \[10, 6, 3, 1\] %. Grade×width 6965.7 %·m is exceptional. - Positive factor: 310 % lead is exceptional on the default band. - Negative factor: Scored from rubric bands during table expansion, not from document context. Evidence · table > 310 ppm Context: and #### Tags used in scoring **True Width Disclosed** Polarity: positive Definition: Actual thickness perpendicular to structure is stated, not just downhole length. Why it applies: true\_width\_m is 20 **QA/QC Disclosed** Polarity: positive Definition: Release includes QA/QC disclosure — certified lab, QP sign-off, or stated methods \(blanks, standards, duplicates\). Why it applies: qaqc\_disclosed is true **Cut-off Undisclosed** Polarity: negative Definition: High-grade interval reported without stating the cut-off grade used for compositing. Why it applies: no cutoff\_grade was stated **Nearology Play** Polarity: neutral Definition: Value premise rests on proximity to a known deposit rather than own results. Why it applies: proximity is offered as the value premise: "The Company's expanded land position now totals approximately 13,061 acres, or roughly twenty square miles, following th" ### and [Link to this fact](https://atlas-staging.minestarters.com/news/thunder-mountain-gold-advances-ag-au-cu-pb-zn-massive-sulfide-resource-expansion--da3cdd1a-bf1d-4d62-a181-c7b678a527a6#fact-drill-facts-49) South Mountain · zinc #### Identity - Hole ID: and - Project: South Mountain - Commodity: zinc - Region: usa\_id - Reported Region: usa\_id - Ticker: THM #### Geometry - Grade: 0.52 - Grade Unit: % - Intercept: 22.47 m - True Width: 20 m - From: 98.66 m - To: 121.13 m - Intercept Depth: 98.66 m #### Classification - Deposit Type: other - Sample Type: drill - Group ID: and:98.66-121.13 - Mining Method: unknown #### Location - CRS: WGS84 \(meters\) #### QA/QC - Laboratory: MSA Labs - QA/QC Disclosed: Yes - QP Signed: Yes - QA/QC Methods: standards, blanks, duplicates #### Review - Needs Review: No - Interp. Status: scored - Historical: No #### Dates - Event date: 2026-09-17T00:00:00.000Z Reasoning: Expanded from assay table. 0.52 % zinc is below against the default band \[18, 10, 5, 2\] %. Grade×width 11.7 %·m is below. - Negative factor: 0.52 % zinc is below the weak threshold \(2 %\) on the default band. - Negative factor: Scored from rubric bands during table expansion, not from document context. Evidence · table > 0.52 % Context: and #### Tags used in scoring **True Width Disclosed** Polarity: positive Definition: Actual thickness perpendicular to structure is stated, not just downhole length. Why it applies: true\_width\_m is 20 **QA/QC Disclosed** Polarity: positive Definition: Release includes QA/QC disclosure — certified lab, QP sign-off, or stated methods \(blanks, standards, duplicates\). Why it applies: qaqc\_disclosed is true **Cut-off Undisclosed** Polarity: negative Definition: High-grade interval reported without stating the cut-off grade used for compositing. Why it applies: no cutoff\_grade was stated **Nearology Play** Polarity: neutral Definition: Value premise rests on proximity to a known deposit rather than own results. Why it applies: proximity is offered as the value premise: "The Company's expanded land position now totals approximately 13,061 acres, or roughly twenty square miles, following th" ### and [Link to this fact](https://atlas-staging.minestarters.com/news/thunder-mountain-gold-advances-ag-au-cu-pb-zn-massive-sulfide-resource-expansion--da3cdd1a-bf1d-4d62-a181-c7b678a527a6#fact-drill-facts-50) South Mountain · silver #### Identity - Hole ID: and - Project: South Mountain - Commodity: silver - Region: usa\_id - Reported Region: usa\_id - Ticker: THM #### Geometry - Grade: 141 - Grade Unit: g/t - Intercept: 10.15 m - True Width: 9.03 m - From: 98.66 m - To: 108.81 m - Intercept Depth: 98.66 m #### Classification - Deposit Type: other - Sample Type: drill - Group ID: and:98.66-108.81 - Mining Method: unknown #### Location - CRS: WGS84 \(meters\) #### QA/QC - Laboratory: MSA Labs - QA/QC Disclosed: Yes - QP Signed: Yes - QA/QC Methods: standards, blanks, duplicates #### Review - Needs Review: No - Interp. Status: scored - Historical: No #### Dates - Event date: 2026-09-17T00:00:00.000Z Reasoning: Expanded from assay table. 141 g/t silver is moderate against the default band \[500, 200, 100, 30\] g/t. Grade×width 1431.2 g/t·m is moderate. - Negative factor: Scored from rubric bands during table expansion, not from document context. Evidence · table > 141 Context: including #### Tags used in scoring **True Width Disclosed** Polarity: positive Definition: Actual thickness perpendicular to structure is stated, not just downhole length. Why it applies: true\_width\_m is 9.03 **QA/QC Disclosed** Polarity: positive Definition: Release includes QA/QC disclosure — certified lab, QP sign-off, or stated methods \(blanks, standards, duplicates\). Why it applies: qaqc\_disclosed is true **Cut-off Undisclosed** Polarity: negative Definition: High-grade interval reported without stating the cut-off grade used for compositing. Why it applies: no cutoff\_grade was stated **Nearology Play** Polarity: neutral Definition: Value premise rests on proximity to a known deposit rather than own results. Why it applies: proximity is offered as the value premise: "The Company's expanded land position now totals approximately 13,061 acres, or roughly twenty square miles, following th" ### and [Link to this fact](https://atlas-staging.minestarters.com/news/thunder-mountain-gold-advances-ag-au-cu-pb-zn-massive-sulfide-resource-expansion--da3cdd1a-bf1d-4d62-a181-c7b678a527a6#fact-drill-facts-51) South Mountain · gold #### Identity - Hole ID: and - Project: South Mountain - Commodity: gold - Region: usa\_id - Reported Region: usa\_id - Ticker: THM #### Geometry - Grade: 0.179 - Grade Unit: g/t - Intercept: 10.15 m - True Width: 9.03 m - From: 98.66 m - To: 108.81 m - Intercept Depth: 98.66 m #### Classification - Deposit Type: other - Sample Type: drill - Group ID: and:98.66-108.81 - Mining Method: unknown #### Location - CRS: WGS84 \(meters\) #### QA/QC - Laboratory: MSA Labs - QA/QC Disclosed: Yes - QP Signed: Yes - QA/QC Methods: standards, blanks, duplicates #### Review - Needs Review: No - Interp. Status: scored - Historical: No #### Dates - Event date: 2026-09-17T00:00:00.000Z Reasoning: Expanded from assay table. 0.179 g/t gold is below against the default band \[5, 2, 1, 0.3\] g/t. Grade×width 1.8 g/t·m is below. - Negative factor: 0.179 g/t gold is below the weak threshold \(0.3 g/t\) on the default band. - Negative factor: Scored from rubric bands during table expansion, not from document context. Evidence · table > 0.179 Context: including #### Tags used in scoring **True Width Disclosed** Polarity: positive Definition: Actual thickness perpendicular to structure is stated, not just downhole length. Why it applies: true\_width\_m is 9.03 **QA/QC Disclosed** Polarity: positive Definition: Release includes QA/QC disclosure — certified lab, QP sign-off, or stated methods \(blanks, standards, duplicates\). Why it applies: qaqc\_disclosed is true **Cut-off Undisclosed** Polarity: negative Definition: High-grade interval reported without stating the cut-off grade used for compositing. Why it applies: no cutoff\_grade was stated **Nearology Play** Polarity: neutral Definition: Value premise rests on proximity to a known deposit rather than own results. Why it applies: proximity is offered as the value premise: "The Company's expanded land position now totals approximately 13,061 acres, or roughly twenty square miles, following th" ### and [Link to this fact](https://atlas-staging.minestarters.com/news/thunder-mountain-gold-advances-ag-au-cu-pb-zn-massive-sulfide-resource-expansion--da3cdd1a-bf1d-4d62-a181-c7b678a527a6#fact-drill-facts-52) South Mountain · copper #### Identity - Hole ID: and - Project: South Mountain - Commodity: copper - Region: usa\_id - Reported Region: usa\_id - Ticker: THM #### Geometry - Grade: 0.74 - Grade Unit: % - Intercept: 10.15 m - True Width: 9.03 m - From: 98.66 m - To: 108.81 m - Intercept Depth: 98.66 m #### Classification - Deposit Type: other - Sample Type: drill - Group ID: and:98.66-108.81 - Mining Method: unknown #### Location - CRS: WGS84 \(meters\) #### QA/QC - Laboratory: MSA Labs - QA/QC Disclosed: Yes - QP Signed: Yes - QA/QC Methods: standards, blanks, duplicates #### Review - Needs Review: No - Interp. Status: scored - Historical: No #### Dates - Event date: 2026-09-17T00:00:00.000Z Reasoning: Expanded from assay table. 0.74 % copper is moderate against the default band \[2.5, 1, 0.5, 0.25\] %. Grade×width 7.5 %·m is below \(grade alone is moderate; the better of the two is used\). - Negative factor: Scored from rubric bands during table expansion, not from document context. Evidence · table > 0.74 % Context: including #### Tags used in scoring **True Width Disclosed** Polarity: positive Definition: Actual thickness perpendicular to structure is stated, not just downhole length. Why it applies: true\_width\_m is 9.03 **QA/QC Disclosed** Polarity: positive Definition: Release includes QA/QC disclosure — certified lab, QP sign-off, or stated methods \(blanks, standards, duplicates\). Why it applies: qaqc\_disclosed is true **Cut-off Undisclosed** Polarity: negative Definition: High-grade interval reported without stating the cut-off grade used for compositing. Why it applies: no cutoff\_grade was stated **Nearology Play** Polarity: neutral Definition: Value premise rests on proximity to a known deposit rather than own results. Why it applies: proximity is offered as the value premise: "The Company's expanded land position now totals approximately 13,061 acres, or roughly twenty square miles, following th" ### and [Link to this fact](https://atlas-staging.minestarters.com/news/thunder-mountain-gold-advances-ag-au-cu-pb-zn-massive-sulfide-resource-expansion--da3cdd1a-bf1d-4d62-a181-c7b678a527a6#fact-drill-facts-53) South Mountain · lead #### Identity - Hole ID: and - Project: South Mountain - Commodity: lead - Region: usa\_id - Reported Region: usa\_id - Ticker: THM #### Geometry - Grade: 382 - Grade Unit: % - Intercept: 10.15 m - True Width: 9.03 m - From: 98.66 m - To: 108.81 m - Intercept Depth: 98.66 m #### Classification - Deposit Type: other - Sample Type: drill - Group ID: and:98.66-108.81 - Mining Method: unknown #### Location - CRS: WGS84 \(meters\) #### QA/QC - Laboratory: MSA Labs - QA/QC Disclosed: Yes - QP Signed: Yes - QA/QC Methods: standards, blanks, duplicates #### Review - Needs Review: No - Interp. Status: scored - Historical: No #### Dates - Event date: 2026-09-17T00:00:00.000Z Reasoning: Expanded from assay table. 382 % lead is exceptional against the default band \[10, 6, 3, 1\] %. Grade×width 3877.3 %·m is exceptional. - Positive factor: 382 % lead is exceptional on the default band. - Negative factor: Scored from rubric bands during table expansion, not from document context. Evidence · table > 382 ppm Context: including #### Tags used in scoring **True Width Disclosed** Polarity: positive Definition: Actual thickness perpendicular to structure is stated, not just downhole length. Why it applies: true\_width\_m is 9.03 **QA/QC Disclosed** Polarity: positive Definition: Release includes QA/QC disclosure — certified lab, QP sign-off, or stated methods \(blanks, standards, duplicates\). Why it applies: qaqc\_disclosed is true **Cut-off Undisclosed** Polarity: negative Definition: High-grade interval reported without stating the cut-off grade used for compositing. Why it applies: no cutoff\_grade was stated **Nearology Play** Polarity: neutral Definition: Value premise rests on proximity to a known deposit rather than own results. Why it applies: proximity is offered as the value premise: "The Company's expanded land position now totals approximately 13,061 acres, or roughly twenty square miles, following th" ### and [Link to this fact](https://atlas-staging.minestarters.com/news/thunder-mountain-gold-advances-ag-au-cu-pb-zn-massive-sulfide-resource-expansion--da3cdd1a-bf1d-4d62-a181-c7b678a527a6#fact-drill-facts-54) South Mountain · zinc #### Identity - Hole ID: and - Project: South Mountain - Commodity: zinc - Region: usa\_id - Reported Region: usa\_id - Ticker: THM #### Geometry - Grade: 1 - Grade Unit: % - Intercept: 10.15 m - True Width: 9.03 m - From: 98.66 m - To: 108.81 m - Intercept Depth: 98.66 m #### Classification - Deposit Type: other - Sample Type: drill - Group ID: and:98.66-108.81 - Mining Method: unknown #### Location - CRS: WGS84 \(meters\) #### QA/QC - Laboratory: MSA Labs - QA/QC Disclosed: Yes - QP Signed: Yes - QA/QC Methods: standards, blanks, duplicates #### Review - Needs Review: No - Interp. Status: scored - Historical: No #### Dates - Event date: 2026-09-17T00:00:00.000Z Reasoning: Expanded from assay table. 1 % zinc is below against the default band \[18, 10, 5, 2\] %. Grade×width 10.2 %·m is below. - Negative factor: 1 % zinc is below the weak threshold \(2 %\) on the default band. - Negative factor: Scored from rubric bands during table expansion, not from document context. Evidence · table > 1.00 % Context: including #### Tags used in scoring **True Width Disclosed** Polarity: positive Definition: Actual thickness perpendicular to structure is stated, not just downhole length. Why it applies: true\_width\_m is 9.03 **QA/QC Disclosed** Polarity: positive Definition: Release includes QA/QC disclosure — certified lab, QP sign-off, or stated methods \(blanks, standards, duplicates\). Why it applies: qaqc\_disclosed is true **Cut-off Undisclosed** Polarity: negative Definition: High-grade interval reported without stating the cut-off grade used for compositing. Why it applies: no cutoff\_grade was stated **Nearology Play** Polarity: neutral Definition: Value premise rests on proximity to a known deposit rather than own results. Why it applies: proximity is offered as the value premise: "The Company's expanded land position now totals approximately 13,061 acres, or roughly twenty square miles, following th" ### and [Link to this fact](https://atlas-staging.minestarters.com/news/thunder-mountain-gold-advances-ag-au-cu-pb-zn-massive-sulfide-resource-expansion--da3cdd1a-bf1d-4d62-a181-c7b678a527a6#fact-drill-facts-55) South Mountain · silver #### Identity - Hole ID: and - Project: South Mountain - Commodity: silver - Region: usa\_id - Reported Region: usa\_id - Ticker: THM #### Geometry - Grade: 117 - Grade Unit: g/t - Intercept: 13.63 m - True Width: 12.81 m - From: 99.79 m - To: 113.42 m - Intercept Depth: 99.79 m #### Classification - Deposit Type: other - Sample Type: drill - Group ID: and:99.79-113.42 - Mining Method: unknown #### Location - CRS: WGS84 \(meters\) #### QA/QC - Laboratory: MSA Labs - QA/QC Disclosed: Yes - QP Signed: Yes - QA/QC Methods: standards, blanks, duplicates #### Review - Needs Review: No - Interp. Status: scored - Historical: No #### Dates - Event date: 2026-09-17T00:00:00.000Z Reasoning: Expanded from assay table. 117 g/t silver is moderate against the default band \[500, 200, 100, 30\] g/t. Grade×width 1594.7 g/t·m is moderate. - Negative factor: Scored from rubric bands during table expansion, not from document context. Evidence · table > 117 Context: and #### Tags used in scoring **True Width Disclosed** Polarity: positive Definition: Actual thickness perpendicular to structure is stated, not just downhole length. Why it applies: true\_width\_m is 12.81 **QA/QC Disclosed** Polarity: positive Definition: Release includes QA/QC disclosure — certified lab, QP sign-off, or stated methods \(blanks, standards, duplicates\). Why it applies: qaqc\_disclosed is true **Cut-off Undisclosed** Polarity: negative Definition: High-grade interval reported without stating the cut-off grade used for compositing. Why it applies: no cutoff\_grade was stated **Nearology Play** Polarity: neutral Definition: Value premise rests on proximity to a known deposit rather than own results. Why it applies: proximity is offered as the value premise: "The Company's expanded land position now totals approximately 13,061 acres, or roughly twenty square miles, following th" ### and [Link to this fact](https://atlas-staging.minestarters.com/news/thunder-mountain-gold-advances-ag-au-cu-pb-zn-massive-sulfide-resource-expansion--da3cdd1a-bf1d-4d62-a181-c7b678a527a6#fact-drill-facts-56) South Mountain · gold #### Identity - Hole ID: and - Project: South Mountain - Commodity: gold - Region: usa\_id - Reported Region: usa\_id - Ticker: THM #### Geometry - Grade: 0.086 - Grade Unit: g/t - Intercept: 13.63 m - True Width: 12.81 m - From: 99.79 m - To: 113.42 m - Intercept Depth: 99.79 m #### Classification - Deposit Type: other - Sample Type: drill - Group ID: and:99.79-113.42 - Mining Method: unknown #### Location - CRS: WGS84 \(meters\) #### QA/QC - Laboratory: MSA Labs - QA/QC Disclosed: Yes - QP Signed: Yes - QA/QC Methods: standards, blanks, duplicates #### Review - Needs Review: No - Interp. Status: scored - Historical: No #### Dates - Event date: 2026-09-17T00:00:00.000Z Reasoning: Expanded from assay table. 0.086 g/t gold is below against the default band \[5, 2, 1, 0.3\] g/t. Grade×width 1.2 g/t·m is below. - Negative factor: 0.086 g/t gold is below the weak threshold \(0.3 g/t\) on the default band. - Negative factor: Scored from rubric bands during table expansion, not from document context. Evidence · table > 0.086 Context: and #### Tags used in scoring **True Width Disclosed** Polarity: positive Definition: Actual thickness perpendicular to structure is stated, not just downhole length. Why it applies: true\_width\_m is 12.81 **QA/QC Disclosed** Polarity: positive Definition: Release includes QA/QC disclosure — certified lab, QP sign-off, or stated methods \(blanks, standards, duplicates\). Why it applies: qaqc\_disclosed is true **Cut-off Undisclosed** Polarity: negative Definition: High-grade interval reported without stating the cut-off grade used for compositing. Why it applies: no cutoff\_grade was stated **Nearology Play** Polarity: neutral Definition: Value premise rests on proximity to a known deposit rather than own results. Why it applies: proximity is offered as the value premise: "The Company's expanded land position now totals approximately 13,061 acres, or roughly twenty square miles, following th" ### and [Link to this fact](https://atlas-staging.minestarters.com/news/thunder-mountain-gold-advances-ag-au-cu-pb-zn-massive-sulfide-resource-expansion--da3cdd1a-bf1d-4d62-a181-c7b678a527a6#fact-drill-facts-57) South Mountain · copper #### Identity - Hole ID: and - Project: South Mountain - Commodity: copper - Region: usa\_id - Reported Region: usa\_id - Ticker: THM #### Geometry - Grade: 0.81 - Grade Unit: % - Intercept: 13.63 m - True Width: 12.81 m - From: 99.79 m - To: 113.42 m - Intercept Depth: 99.79 m #### Classification - Deposit Type: other - Sample Type: drill - Group ID: and:99.79-113.42 - Mining Method: unknown #### Location - CRS: WGS84 \(meters\) #### QA/QC - Laboratory: MSA Labs - QA/QC Disclosed: Yes - QP Signed: Yes - QA/QC Methods: standards, blanks, duplicates #### Review - Needs Review: No - Interp. Status: scored - Historical: No #### Dates - Event date: 2026-09-17T00:00:00.000Z Reasoning: Expanded from assay table. 0.81 % copper is moderate against the default band \[2.5, 1, 0.5, 0.25\] %. Grade×width 11.0 %·m is below \(grade alone is moderate; the better of the two is used\). - Negative factor: Scored from rubric bands during table expansion, not from document context. Evidence · table > 0.81 % Context: and #### Tags used in scoring **True Width Disclosed** Polarity: positive Definition: Actual thickness perpendicular to structure is stated, not just downhole length. Why it applies: true\_width\_m is 12.81 **QA/QC Disclosed** Polarity: positive Definition: Release includes QA/QC disclosure — certified lab, QP sign-off, or stated methods \(blanks, standards, duplicates\). Why it applies: qaqc\_disclosed is true **Cut-off Undisclosed** Polarity: negative Definition: High-grade interval reported without stating the cut-off grade used for compositing. Why it applies: no cutoff\_grade was stated **Nearology Play** Polarity: neutral Definition: Value premise rests on proximity to a known deposit rather than own results. Why it applies: proximity is offered as the value premise: "The Company's expanded land position now totals approximately 13,061 acres, or roughly twenty square miles, following th" ### and [Link to this fact](https://atlas-staging.minestarters.com/news/thunder-mountain-gold-advances-ag-au-cu-pb-zn-massive-sulfide-resource-expansion--da3cdd1a-bf1d-4d62-a181-c7b678a527a6#fact-drill-facts-58) South Mountain · lead #### Identity - Hole ID: and - Project: South Mountain - Commodity: lead - Region: usa\_id - Reported Region: usa\_id - Ticker: THM #### Geometry - Grade: 352 - Grade Unit: % - Intercept: 13.63 m - True Width: 12.81 m - From: 99.79 m - To: 113.42 m - Intercept Depth: 99.79 m #### Classification - Deposit Type: other - Sample Type: drill - Group ID: and:99.79-113.42 - Mining Method: unknown #### Location - CRS: WGS84 \(meters\) #### QA/QC - Laboratory: MSA Labs - QA/QC Disclosed: Yes - QP Signed: Yes - QA/QC Methods: standards, blanks, duplicates #### Review - Needs Review: No - Interp. Status: scored - Historical: No #### Dates - Event date: 2026-09-17T00:00:00.000Z Reasoning: Expanded from assay table. 352 % lead is exceptional against the default band \[10, 6, 3, 1\] %. Grade×width 4797.8 %·m is exceptional. - Positive factor: 352 % lead is exceptional on the default band. - Negative factor: Scored from rubric bands during table expansion, not from document context. Evidence · table > 352 ppm Context: and #### Tags used in scoring **True Width Disclosed** Polarity: positive Definition: Actual thickness perpendicular to structure is stated, not just downhole length. Why it applies: true\_width\_m is 12.81 **QA/QC Disclosed** Polarity: positive Definition: Release includes QA/QC disclosure — certified lab, QP sign-off, or stated methods \(blanks, standards, duplicates\). Why it applies: qaqc\_disclosed is true **Cut-off Undisclosed** Polarity: negative Definition: High-grade interval reported without stating the cut-off grade used for compositing. Why it applies: no cutoff\_grade was stated **Nearology Play** Polarity: neutral Definition: Value premise rests on proximity to a known deposit rather than own results. Why it applies: proximity is offered as the value premise: "The Company's expanded land position now totals approximately 13,061 acres, or roughly twenty square miles, following th" ### and [Link to this fact](https://atlas-staging.minestarters.com/news/thunder-mountain-gold-advances-ag-au-cu-pb-zn-massive-sulfide-resource-expansion--da3cdd1a-bf1d-4d62-a181-c7b678a527a6#fact-drill-facts-59) South Mountain · zinc #### Identity - Hole ID: and - Project: South Mountain - Commodity: zinc - Region: usa\_id - Reported Region: usa\_id - Ticker: THM #### Geometry - Grade: 0.94 - Grade Unit: % - Intercept: 13.63 m - True Width: 12.81 m - From: 99.79 m - To: 113.42 m - Intercept Depth: 99.79 m #### Classification - Deposit Type: other - Sample Type: drill - Group ID: and:99.79-113.42 - Mining Method: unknown #### Location - CRS: WGS84 \(meters\) #### QA/QC - Laboratory: MSA Labs - QA/QC Disclosed: Yes - QP Signed: Yes - QA/QC Methods: standards, blanks, duplicates #### Review - Needs Review: No - Interp. Status: scored - Historical: No #### Dates - Event date: 2026-09-17T00:00:00.000Z Reasoning: Expanded from assay table. 0.94 % zinc is below against the default band \[18, 10, 5, 2\] %. Grade×width 12.8 %·m is below. - Negative factor: 0.94 % zinc is below the weak threshold \(2 %\) on the default band. - Negative factor: Scored from rubric bands during table expansion, not from document context. Evidence · table > 0.94 % Context: and #### Tags used in scoring **True Width Disclosed** Polarity: positive Definition: Actual thickness perpendicular to structure is stated, not just downhole length. Why it applies: true\_width\_m is 12.81 **QA/QC Disclosed** Polarity: positive Definition: Release includes QA/QC disclosure — certified lab, QP sign-off, or stated methods \(blanks, standards, duplicates\). Why it applies: qaqc\_disclosed is true **Cut-off Undisclosed** Polarity: negative Definition: High-grade interval reported without stating the cut-off grade used for compositing. Why it applies: no cutoff\_grade was stated **Nearology Play** Polarity: neutral Definition: Value premise rests on proximity to a known deposit rather than own results. Why it applies: proximity is offered as the value premise: "The Company's expanded land position now totals approximately 13,061 acres, or roughly twenty square miles, following th" ### and [Link to this fact](https://atlas-staging.minestarters.com/news/thunder-mountain-gold-advances-ag-au-cu-pb-zn-massive-sulfide-resource-expansion--da3cdd1a-bf1d-4d62-a181-c7b678a527a6#fact-drill-facts-60) South Mountain · silver #### Identity - Hole ID: and - Project: South Mountain - Commodity: silver - Region: usa\_id - Reported Region: usa\_id - Ticker: THM #### Geometry - Grade: 234 - Grade Unit: g/t - Intercept: 4.67 m - True Width: 4.39 m - From: 101.19 m - To: 105.86 m - Intercept Depth: 101.19 m #### Classification - Deposit Type: other - Sample Type: drill - Group ID: and:101.19-105.86 - Mining Method: unknown #### Location - CRS: WGS84 \(meters\) #### QA/QC - Laboratory: MSA Labs - QA/QC Disclosed: Yes - QP Signed: Yes - QA/QC Methods: standards, blanks, duplicates #### Review - Needs Review: No - Interp. Status: scored - Historical: No #### Dates - Event date: 2026-09-17T00:00:00.000Z Reasoning: Expanded from assay table. 234 g/t silver is strong against the default band \[500, 200, 100, 30\] g/t. Grade×width 1092.8 g/t·m is moderate \(grade alone is strong; the better of the two is used\). - Positive factor: 234 g/t silver is strong on the default band. - Negative factor: Scored from rubric bands during table expansion, not from document context. Evidence · table > 234 Context: including #### Tags used in scoring **True Width Disclosed** Polarity: positive Definition: Actual thickness perpendicular to structure is stated, not just downhole length. Why it applies: true\_width\_m is 4.39 **QA/QC Disclosed** Polarity: positive Definition: Release includes QA/QC disclosure — certified lab, QP sign-off, or stated methods \(blanks, standards, duplicates\). Why it applies: qaqc\_disclosed is true **Cut-off Undisclosed** Polarity: negative Definition: High-grade interval reported without stating the cut-off grade used for compositing. Why it applies: no cutoff\_grade was stated **Nearology Play** Polarity: neutral Definition: Value premise rests on proximity to a known deposit rather than own results. Why it applies: proximity is offered as the value premise: "The Company's expanded land position now totals approximately 13,061 acres, or roughly twenty square miles, following th" ### and [Link to this fact](https://atlas-staging.minestarters.com/news/thunder-mountain-gold-advances-ag-au-cu-pb-zn-massive-sulfide-resource-expansion--da3cdd1a-bf1d-4d62-a181-c7b678a527a6#fact-drill-facts-61) South Mountain · gold #### Identity - Hole ID: and - Project: South Mountain - Commodity: gold - Region: usa\_id - Reported Region: usa\_id - Ticker: THM #### Geometry - Grade: 0.196 - Grade Unit: g/t - Intercept: 4.67 m - True Width: 4.39 m - From: 101.19 m - To: 105.86 m - Intercept Depth: 101.19 m #### Classification - Deposit Type: other - Sample Type: drill - Group ID: and:101.19-105.86 - Mining Method: unknown #### Location - CRS: WGS84 \(meters\) #### QA/QC - Laboratory: MSA Labs - QA/QC Disclosed: Yes - QP Signed: Yes - QA/QC Methods: standards, blanks, duplicates #### Review - Needs Review: No - Interp. Status: scored - Historical: No #### Dates - Event date: 2026-09-17T00:00:00.000Z Reasoning: Expanded from assay table. 0.196 g/t gold is below against the default band \[5, 2, 1, 0.3\] g/t. Grade×width 0.9 g/t·m is below. - Negative factor: 0.196 g/t gold is below the weak threshold \(0.3 g/t\) on the default band. - Negative factor: Scored from rubric bands during table expansion, not from document context. Evidence · table > 0.196 Context: including #### Tags used in scoring **True Width Disclosed** Polarity: positive Definition: Actual thickness perpendicular to structure is stated, not just downhole length. Why it applies: true\_width\_m is 4.39 **QA/QC Disclosed** Polarity: positive Definition: Release includes QA/QC disclosure — certified lab, QP sign-off, or stated methods \(blanks, standards, duplicates\). Why it applies: qaqc\_disclosed is true **Cut-off Undisclosed** Polarity: negative Definition: High-grade interval reported without stating the cut-off grade used for compositing. Why it applies: no cutoff\_grade was stated **Nearology Play** Polarity: neutral Definition: Value premise rests on proximity to a known deposit rather than own results. Why it applies: proximity is offered as the value premise: "The Company's expanded land position now totals approximately 13,061 acres, or roughly twenty square miles, following th" ### and [Link to this fact](https://atlas-staging.minestarters.com/news/thunder-mountain-gold-advances-ag-au-cu-pb-zn-massive-sulfide-resource-expansion--da3cdd1a-bf1d-4d62-a181-c7b678a527a6#fact-drill-facts-62) South Mountain · copper #### Identity - Hole ID: and - Project: South Mountain - Commodity: copper - Region: usa\_id - Reported Region: usa\_id - Ticker: THM #### Geometry - Grade: 2.12 - Grade Unit: % - Intercept: 4.67 m - True Width: 4.39 m - From: 101.19 m - To: 105.86 m - Intercept Depth: 101.19 m #### Classification - Deposit Type: other - Sample Type: drill - Group ID: and:101.19-105.86 - Mining Method: unknown #### Location - CRS: WGS84 \(meters\) #### QA/QC - Laboratory: MSA Labs - QA/QC Disclosed: Yes - QP Signed: Yes - QA/QC Methods: standards, blanks, duplicates #### Review - Needs Review: No - Interp. Status: scored - Historical: No #### Dates - Event date: 2026-09-17T00:00:00.000Z Reasoning: Expanded from assay table. 2.12 % copper is strong against the default band \[2.5, 1, 0.5, 0.25\] %. Grade×width 9.9 %·m is below \(grade alone is strong; the better of the two is used\). - Positive factor: 2.12 % copper is strong on the default band. - Negative factor: Scored from rubric bands during table expansion, not from document context. Evidence · table > 2.12 % Context: including #### Tags used in scoring **True Width Disclosed** Polarity: positive Definition: Actual thickness perpendicular to structure is stated, not just downhole length. Why it applies: true\_width\_m is 4.39 **QA/QC Disclosed** Polarity: positive Definition: Release includes QA/QC disclosure — certified lab, QP sign-off, or stated methods \(blanks, standards, duplicates\). Why it applies: qaqc\_disclosed is true **Cut-off Undisclosed** Polarity: negative Definition: High-grade interval reported without stating the cut-off grade used for compositing. Why it applies: no cutoff\_grade was stated **Nearology Play** Polarity: neutral Definition: Value premise rests on proximity to a known deposit rather than own results. Why it applies: proximity is offered as the value premise: "The Company's expanded land position now totals approximately 13,061 acres, or roughly twenty square miles, following th" ### and [Link to this fact](https://atlas-staging.minestarters.com/news/thunder-mountain-gold-advances-ag-au-cu-pb-zn-massive-sulfide-resource-expansion--da3cdd1a-bf1d-4d62-a181-c7b678a527a6#fact-drill-facts-63) South Mountain · lead #### Identity - Hole ID: and - Project: South Mountain - Commodity: lead - Region: usa\_id - Reported Region: usa\_id - Ticker: THM #### Geometry - Grade: 454 - Grade Unit: % - Intercept: 4.67 m - True Width: 4.39 m - From: 101.19 m - To: 105.86 m - Intercept Depth: 101.19 m #### Classification - Deposit Type: other - Sample Type: drill - Group ID: and:101.19-105.86 - Mining Method: unknown #### Location - CRS: WGS84 \(meters\) #### QA/QC - Laboratory: MSA Labs - QA/QC Disclosed: Yes - QP Signed: Yes - QA/QC Methods: standards, blanks, duplicates #### Review - Needs Review: No - Interp. Status: scored - Historical: No #### Dates - Event date: 2026-09-17T00:00:00.000Z Reasoning: Expanded from assay table. 454 % lead is exceptional against the default band \[10, 6, 3, 1\] %. Grade×width 2120.2 %·m is exceptional. - Positive factor: 454 % lead is exceptional on the default band. - Negative factor: Scored from rubric bands during table expansion, not from document context. Evidence · table > 454 ppm Context: including #### Tags used in scoring **True Width Disclosed** Polarity: positive Definition: Actual thickness perpendicular to structure is stated, not just downhole length. Why it applies: true\_width\_m is 4.39 **QA/QC Disclosed** Polarity: positive Definition: Release includes QA/QC disclosure — certified lab, QP sign-off, or stated methods \(blanks, standards, duplicates\). Why it applies: qaqc\_disclosed is true **Cut-off Undisclosed** Polarity: negative Definition: High-grade interval reported without stating the cut-off grade used for compositing. Why it applies: no cutoff\_grade was stated **Nearology Play** Polarity: neutral Definition: Value premise rests on proximity to a known deposit rather than own results. Why it applies: proximity is offered as the value premise: "The Company's expanded land position now totals approximately 13,061 acres, or roughly twenty square miles, following th" ### and [Link to this fact](https://atlas-staging.minestarters.com/news/thunder-mountain-gold-advances-ag-au-cu-pb-zn-massive-sulfide-resource-expansion--da3cdd1a-bf1d-4d62-a181-c7b678a527a6#fact-drill-facts-64) South Mountain · zinc #### Identity - Hole ID: and - Project: South Mountain - Commodity: zinc - Region: usa\_id - Reported Region: usa\_id - Ticker: THM #### Geometry - Grade: 2.44 - Grade Unit: % - Intercept: 4.67 m - True Width: 4.39 m - From: 101.19 m - To: 105.86 m - Intercept Depth: 101.19 m #### Classification - Deposit Type: other - Sample Type: drill - Group ID: and:101.19-105.86 - Mining Method: unknown #### Location - CRS: WGS84 \(meters\) #### QA/QC - Laboratory: MSA Labs - QA/QC Disclosed: Yes - QP Signed: Yes - QA/QC Methods: standards, blanks, duplicates #### Review - Needs Review: No - Interp. Status: scored - Historical: No #### Dates - Event date: 2026-09-17T00:00:00.000Z Reasoning: Expanded from assay table. 2.44 % zinc is weak against the default band \[18, 10, 5, 2\] %. Grade×width 11.4 %·m is below \(grade alone is weak; the better of the two is used\). - Negative factor: Scored from rubric bands during table expansion, not from document context. Evidence · table > 2.44 % Context: including #### Tags used in scoring **True Width Disclosed** Polarity: positive Definition: Actual thickness perpendicular to structure is stated, not just downhole length. Why it applies: true\_width\_m is 4.39 **QA/QC Disclosed** Polarity: positive Definition: Release includes QA/QC disclosure — certified lab, QP sign-off, or stated methods \(blanks, standards, duplicates\). Why it applies: qaqc\_disclosed is true **Cut-off Undisclosed** Polarity: negative Definition: High-grade interval reported without stating the cut-off grade used for compositing. Why it applies: no cutoff\_grade was stated **Nearology Play** Polarity: neutral Definition: Value premise rests on proximity to a known deposit rather than own results. Why it applies: proximity is offered as the value premise: "The Company's expanded land position now totals approximately 13,061 acres, or roughly twenty square miles, following th" ## How Atlas produces this analysis Minestarters Atlas uses automated extraction to summarize mining announcements, identify reported measurements, and classify supporting evidence. Sentiment reflects the extracted narrative and classification rules; it is an interpretation, not a reported measurement. Evidence quotes and context are provided where available. Missing data, low-confidence results, and review flags indicate limitations. Check the original publisher announcement before relying on an interpretation.