# Errington Metals Announces Maiden Mineral Resource Estimate for the Sudbury Basin Project Canonical Atlas analysis: https://atlas-staging.minestarters.com/news/errington-metals-announces-maiden-mineral-resource-estimate-for-the-sudbury-basi--bbb1c514-9795-4b6f-b9a9-5240ab9d2f14 Original source: https://www.newswire.ca/news-releases/errington-metals-announces-maiden-mineral-resource-estimate-for-the-sudbury-basin-project-805867554.html Publisher: cnw Original announcement: 2026-09-22T10:31:24.756Z Analysis by Minestarters Atlas Atlas analysis published: 2026-09-22T10:41:51.813Z Atlas analysis updated: 2026-09-22T10:41:51.813Z - Company: Errington Metals Corp. - Ticker: EM - Exchange: Unavailable - Region: Sudbury Basin - Primary commodity: Copper - Secondary commodities: Zinc, Lead, Gold, Silver - Document categories: Resource update - Extracted: 2026-09-22 10:41:52 UTC Narrative sentiment: 0.80 · Bullish ## Minestarters Atlas summary Errington Metals has announced its maiden Mineral Resource Estimate for the Sudbury Basin Project, reporting a combined M&I resource of 14.20 Mt at 1.20% Cu, 4.02% Zn, 1.11% Pb, 0.83 g/t Au, and 50.25 g/t Ag. Over 80% of the total resources are classified as Measured or Indicated, providing a high-confidence foundation for future development. The company is currently executing a 55,000 m drill program to expand the resource base. Reasoning: The announcement of a maiden M&I resource with >80% confidence and significant contained metal is a major de-risking milestone for the project. - Positive factor: Maiden resource estimate establishes a strong foundation - Positive factor: High M&I percentage \(>80%\) provides high geological confidence - Positive factor: Significant tonnage with high-grade polymetallic profile - Positive factor: All deposits remain open for expansion - Positive factor: Fully funded 55,000 m drill campaign underway - Negative factor: Metallurgical recoveries are based on historical data and are still being optimized Facts used in scoring: 15 ## Classification and evidence **Maiden Resource** Polarity: neutral Definition: First formal MRE for the project — establishes baseline but typically exploration-stage with high Inferred component. Why it applies: This is the first formal MRE for the Sudbury Basin Project. Evidence · text > announce a maiden mineral resource estimate **NI 43-101 Compliant** Polarity: positive Definition: Resource estimate prepared in compliance with NI 43-101 \(Canada\) — high reporting standard. Why it applies: The resource estimate was prepared in accordance with NI 43-101 standards. Evidence · text > prepared in accordance with National Instrument 43-101 **QP/CP Signed** Polarity: positive 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: Ryan Wilson, Ph.D., P. Geo, is named as the independent qualified person. Evidence · text > prepared by Ryan Wilson, Ph.D., P. Geo, of DRA Americas Incorporated ## Extracted facts Stored fact records: 15. Some facts used in scoring do not have a stored record. ## Resource Estimates (15) ### measured [Link to this fact](https://atlas-staging.minestarters.com/news/errington-metals-announces-maiden-mineral-resource-estimate-for-the-sudbury-basi--bbb1c514-9795-4b6f-b9a9-5240ab9d2f14#fact-resource-facts-0) Sudbury Basin Project · copper #### Identity - Project: Sudbury Basin Project - Commodity: copper - Region: sudbury basin - Reported Region: Sudbury Basin - Ticker: EM #### Resource scope - Estimate type: resource - Effective date: 2026-09-20T00:00:00.000Z - Reporting standards: ni\_43\_101 - QP Signed: Yes - Qualified person names: Ryan Wilson - Resource group id: resource:0932a3f49dae8a8284e7 - Deposit or zone: Errington - Mining method: underground #### Resource Data - Category: measured - Tonnes: 7652664 - Grade: 1.13 - Grade Unit: % #### Prior Estimate - Resource Date: 2026-09-20 #### Metal Equivalent - Assumptions Disclosed: Yes #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-09-22T00:00:00.000Z Reasoning: High-grade measured copper intercept in a maiden resource. - Positive factor: Measured category provides high confidence Evidence · table > 1.13 Context: 7,652,664 #### Tags used in scoring **Measured Resource** Polarity: positive Definition: Highest confidence category — tonnage, grade, shape well-established from closely-spaced drilling. Basis for Proven Reserves. Why it applies: category is "measured" **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 **QP/CP Signed** Polarity: positive 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: qp\_signed is true **NI 43-101 Compliant** Polarity: positive Definition: Resource estimate prepared in compliance with NI 43-101 \(Canada\) — high reporting standard. Why it applies: reporting\_standards includes ni\_43\_101 **No Contained Metal** Polarity: negative Definition: Tonnage and grade reported but contained metal not calculated or disclosed — incomplete reporting. Why it applies: contained\_metal was not reported **Resource Update** Polarity: neutral Definition: Revised estimate for an existing resource — compare to prior to assess progress. Why it applies: the release compares against a previous estimate ### measured [Link to this fact](https://atlas-staging.minestarters.com/news/errington-metals-announces-maiden-mineral-resource-estimate-for-the-sudbury-basi--bbb1c514-9795-4b6f-b9a9-5240ab9d2f14#fact-resource-facts-1) Sudbury Basin Project · zinc #### Identity - Project: Sudbury Basin Project - Commodity: zinc - Region: sudbury basin - Reported Region: Sudbury Basin - Ticker: EM #### Resource scope - Estimate type: resource - Effective date: 2026-09-20T00:00:00.000Z - Reporting standards: ni\_43\_101 - QP Signed: Yes - Qualified person names: Ryan Wilson - Resource group id: resource:0932a3f49dae8a8284e7 - Deposit or zone: Errington - Mining method: underground #### Resource Data - Category: measured - Tonnes: 7652664 - Grade: 3.61 - Grade Unit: % #### Prior Estimate - Resource Date: 2026-09-20 #### Metal Equivalent - Assumptions Disclosed: Yes #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-09-22T00:00:00.000Z Reasoning: Significant zinc component in measured resource. - Positive factor: Strong zinc grade in measured category Evidence · table > 3.61 Context: 7,652,664 #### Tags used in scoring **Measured Resource** Polarity: positive Definition: Highest confidence category — tonnage, grade, shape well-established from closely-spaced drilling. Basis for Proven Reserves. Why it applies: category is "measured" **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 **QP/CP Signed** Polarity: positive 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: qp\_signed is true **NI 43-101 Compliant** Polarity: positive Definition: Resource estimate prepared in compliance with NI 43-101 \(Canada\) — high reporting standard. Why it applies: reporting\_standards includes ni\_43\_101 **No Contained Metal** Polarity: negative Definition: Tonnage and grade reported but contained metal not calculated or disclosed — incomplete reporting. Why it applies: contained\_metal was not reported **Resource Update** Polarity: neutral Definition: Revised estimate for an existing resource — compare to prior to assess progress. Why it applies: the release compares against a previous estimate ### measured [Link to this fact](https://atlas-staging.minestarters.com/news/errington-metals-announces-maiden-mineral-resource-estimate-for-the-sudbury-basi--bbb1c514-9795-4b6f-b9a9-5240ab9d2f14#fact-resource-facts-2) Sudbury Basin Project · lead #### Identity - Project: Sudbury Basin Project - Commodity: lead - Region: sudbury basin - Reported Region: Sudbury Basin - Ticker: EM #### Resource scope - Estimate type: resource - Effective date: 2026-09-20T00:00:00.000Z - Reporting standards: ni\_43\_101 - QP Signed: Yes - Qualified person names: Ryan Wilson - Resource group id: resource:0932a3f49dae8a8284e7 - Deposit or zone: Errington - Mining method: underground #### Resource Data - Category: measured - Tonnes: 7652664 - Grade: 0.99 - Grade Unit: % #### Prior Estimate - Resource Date: 2026-09-20 #### Metal Equivalent - Assumptions Disclosed: Yes #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-09-22T00:00:00.000Z Reasoning: Lead byproduct in measured resource. Evidence · table > 0.99 Context: 7,652,664 #### Tags used in scoring **Measured Resource** Polarity: positive Definition: Highest confidence category — tonnage, grade, shape well-established from closely-spaced drilling. Basis for Proven Reserves. Why it applies: category is "measured" **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 **QP/CP Signed** Polarity: positive 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: qp\_signed is true **NI 43-101 Compliant** Polarity: positive Definition: Resource estimate prepared in compliance with NI 43-101 \(Canada\) — high reporting standard. Why it applies: reporting\_standards includes ni\_43\_101 **No Contained Metal** Polarity: negative Definition: Tonnage and grade reported but contained metal not calculated or disclosed — incomplete reporting. Why it applies: contained\_metal was not reported **Resource Update** Polarity: neutral Definition: Revised estimate for an existing resource — compare to prior to assess progress. Why it applies: the release compares against a previous estimate ### measured [Link to this fact](https://atlas-staging.minestarters.com/news/errington-metals-announces-maiden-mineral-resource-estimate-for-the-sudbury-basi--bbb1c514-9795-4b6f-b9a9-5240ab9d2f14#fact-resource-facts-3) Sudbury Basin Project · gold #### Identity - Project: Sudbury Basin Project - Commodity: gold - Region: sudbury basin - Reported Region: Sudbury Basin - Ticker: EM #### Resource scope - Estimate type: resource - Effective date: 2026-09-20T00:00:00.000Z - Reporting standards: ni\_43\_101 - QP Signed: Yes - Qualified person names: Ryan Wilson - Resource group id: resource:0932a3f49dae8a8284e7 - Deposit or zone: Errington - Mining method: underground #### Resource Data - Category: measured - Tonnes: 7652664 - Grade: 0.81 - Grade Unit: g/t #### Prior Estimate - Resource Date: 2026-09-20 #### Metal Equivalent - Assumptions Disclosed: Yes #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-09-22T00:00:00.000Z Reasoning: Gold byproduct in measured resource. Evidence · table > 0.81 Context: 7,652,664 #### Tags used in scoring **Measured Resource** Polarity: positive Definition: Highest confidence category — tonnage, grade, shape well-established from closely-spaced drilling. Basis for Proven Reserves. Why it applies: category is "measured" **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 **QP/CP Signed** Polarity: positive 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: qp\_signed is true **NI 43-101 Compliant** Polarity: positive Definition: Resource estimate prepared in compliance with NI 43-101 \(Canada\) — high reporting standard. Why it applies: reporting\_standards includes ni\_43\_101 **No Contained Metal** Polarity: negative Definition: Tonnage and grade reported but contained metal not calculated or disclosed — incomplete reporting. Why it applies: contained\_metal was not reported **Resource Update** Polarity: neutral Definition: Revised estimate for an existing resource — compare to prior to assess progress. Why it applies: the release compares against a previous estimate ### measured [Link to this fact](https://atlas-staging.minestarters.com/news/errington-metals-announces-maiden-mineral-resource-estimate-for-the-sudbury-basi--bbb1c514-9795-4b6f-b9a9-5240ab9d2f14#fact-resource-facts-4) Sudbury Basin Project · silver #### Identity - Project: Sudbury Basin Project - Commodity: silver - Region: sudbury basin - Reported Region: Sudbury Basin - Ticker: EM #### Resource scope - Estimate type: resource - Effective date: 2026-09-20T00:00:00.000Z - Reporting standards: ni\_43\_101 - QP Signed: Yes - Qualified person names: Ryan Wilson - Resource group id: resource:0932a3f49dae8a8284e7 - Deposit or zone: Errington - Mining method: underground #### Resource Data - Category: measured - Tonnes: 7652664 - Grade: 46.08 - Grade Unit: g/t #### Prior Estimate - Resource Date: 2026-09-20 #### Metal Equivalent - Assumptions Disclosed: Yes #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-09-22T00:00:00.000Z Reasoning: Silver byproduct in measured resource. Evidence · table > 46.08 Context: 7,652,664 #### Tags used in scoring **Measured Resource** Polarity: positive Definition: Highest confidence category — tonnage, grade, shape well-established from closely-spaced drilling. Basis for Proven Reserves. Why it applies: category is "measured" **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 **QP/CP Signed** Polarity: positive 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: qp\_signed is true **NI 43-101 Compliant** Polarity: positive Definition: Resource estimate prepared in compliance with NI 43-101 \(Canada\) — high reporting standard. Why it applies: reporting\_standards includes ni\_43\_101 **No Contained Metal** Polarity: negative Definition: Tonnage and grade reported but contained metal not calculated or disclosed — incomplete reporting. Why it applies: contained\_metal was not reported **Resource Update** Polarity: neutral Definition: Revised estimate for an existing resource — compare to prior to assess progress. Why it applies: the release compares against a previous estimate ### indicated [Link to this fact](https://atlas-staging.minestarters.com/news/errington-metals-announces-maiden-mineral-resource-estimate-for-the-sudbury-basi--bbb1c514-9795-4b6f-b9a9-5240ab9d2f14#fact-resource-facts-5) Sudbury Basin Project · copper #### Identity - Project: Sudbury Basin Project - Commodity: copper - Region: sudbury basin - Reported Region: Sudbury Basin - Ticker: EM #### Resource scope - Estimate type: resource - Effective date: 2026-09-20T00:00:00.000Z - Reporting standards: ni\_43\_101 - QP Signed: Yes - Qualified person names: Ryan Wilson - Resource group id: resource:54a5adfc84269efae504 - Deposit or zone: Errington - Mining method: underground #### Resource Data - Category: indicated - Tonnes: 2968518 - Grade: 1.13 - Grade Unit: % #### Prior Estimate - Resource Date: 2026-09-20 #### Metal Equivalent - Assumptions Disclosed: Yes #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-09-22T00:00:00.000Z Reasoning: Indicated copper resource. Evidence · table > 1.13 Context: 2,968,518 #### Tags used in scoring **Indicated Resource** Polarity: positive Definition: Reasonable geological confidence based on adequate drilling; continuity can be assumed. Basis for Probable Reserves. Why it applies: category is "indicated" **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 **QP/CP Signed** Polarity: positive 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: qp\_signed is true **NI 43-101 Compliant** Polarity: positive Definition: Resource estimate prepared in compliance with NI 43-101 \(Canada\) — high reporting standard. Why it applies: reporting\_standards includes ni\_43\_101 **No Contained Metal** Polarity: negative Definition: Tonnage and grade reported but contained metal not calculated or disclosed — incomplete reporting. Why it applies: contained\_metal was not reported **Resource Update** Polarity: neutral Definition: Revised estimate for an existing resource — compare to prior to assess progress. Why it applies: the release compares against a previous estimate ### indicated [Link to this fact](https://atlas-staging.minestarters.com/news/errington-metals-announces-maiden-mineral-resource-estimate-for-the-sudbury-basi--bbb1c514-9795-4b6f-b9a9-5240ab9d2f14#fact-resource-facts-6) Sudbury Basin Project · zinc #### Identity - Project: Sudbury Basin Project - Commodity: zinc - Region: sudbury basin - Reported Region: Sudbury Basin - Ticker: EM #### Resource scope - Estimate type: resource - Effective date: 2026-09-20T00:00:00.000Z - Reporting standards: ni\_43\_101 - QP Signed: Yes - Qualified person names: Ryan Wilson - Resource group id: resource:54a5adfc84269efae504 - Deposit or zone: Errington - Mining method: underground #### Resource Data - Category: indicated - Tonnes: 2968518 - Grade: 4.55 - Grade Unit: % #### Prior Estimate - Resource Date: 2026-09-20 #### Metal Equivalent - Assumptions Disclosed: Yes #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-09-22T00:00:00.000Z Reasoning: Indicated zinc resource. Evidence · table > 4.55 Context: 2,968,518 #### Tags used in scoring **Indicated Resource** Polarity: positive Definition: Reasonable geological confidence based on adequate drilling; continuity can be assumed. Basis for Probable Reserves. Why it applies: category is "indicated" **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 **QP/CP Signed** Polarity: positive 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: qp\_signed is true **NI 43-101 Compliant** Polarity: positive Definition: Resource estimate prepared in compliance with NI 43-101 \(Canada\) — high reporting standard. Why it applies: reporting\_standards includes ni\_43\_101 **No Contained Metal** Polarity: negative Definition: Tonnage and grade reported but contained metal not calculated or disclosed — incomplete reporting. Why it applies: contained\_metal was not reported **Resource Update** Polarity: neutral Definition: Revised estimate for an existing resource — compare to prior to assess progress. Why it applies: the release compares against a previous estimate ### indicated [Link to this fact](https://atlas-staging.minestarters.com/news/errington-metals-announces-maiden-mineral-resource-estimate-for-the-sudbury-basi--bbb1c514-9795-4b6f-b9a9-5240ab9d2f14#fact-resource-facts-7) Sudbury Basin Project · lead #### Identity - Project: Sudbury Basin Project - Commodity: lead - Region: sudbury basin - Reported Region: Sudbury Basin - Ticker: EM #### Resource scope - Estimate type: resource - Effective date: 2026-09-20T00:00:00.000Z - Reporting standards: ni\_43\_101 - QP Signed: Yes - Qualified person names: Ryan Wilson - Resource group id: resource:54a5adfc84269efae504 - Deposit or zone: Errington - Mining method: underground #### Resource Data - Category: indicated - Tonnes: 2968518 - Grade: 1.3 - Grade Unit: % #### Prior Estimate - Resource Date: 2026-09-20 #### Metal Equivalent - Assumptions Disclosed: Yes #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-09-22T00:00:00.000Z Reasoning: Indicated lead byproduct. Evidence · table > 1.30 Context: 2,968,518 #### Tags used in scoring **Indicated Resource** Polarity: positive Definition: Reasonable geological confidence based on adequate drilling; continuity can be assumed. Basis for Probable Reserves. Why it applies: category is "indicated" **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 **QP/CP Signed** Polarity: positive 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: qp\_signed is true **NI 43-101 Compliant** Polarity: positive Definition: Resource estimate prepared in compliance with NI 43-101 \(Canada\) — high reporting standard. Why it applies: reporting\_standards includes ni\_43\_101 **No Contained Metal** Polarity: negative Definition: Tonnage and grade reported but contained metal not calculated or disclosed — incomplete reporting. Why it applies: contained\_metal was not reported **Resource Update** Polarity: neutral Definition: Revised estimate for an existing resource — compare to prior to assess progress. Why it applies: the release compares against a previous estimate ### indicated [Link to this fact](https://atlas-staging.minestarters.com/news/errington-metals-announces-maiden-mineral-resource-estimate-for-the-sudbury-basi--bbb1c514-9795-4b6f-b9a9-5240ab9d2f14#fact-resource-facts-8) Sudbury Basin Project · gold #### Identity - Project: Sudbury Basin Project - Commodity: gold - Region: sudbury basin - Reported Region: Sudbury Basin - Ticker: EM #### Resource scope - Estimate type: resource - Effective date: 2026-09-20T00:00:00.000Z - Reporting standards: ni\_43\_101 - QP Signed: Yes - Qualified person names: Ryan Wilson - Resource group id: resource:54a5adfc84269efae504 - Deposit or zone: Errington - Mining method: underground #### Resource Data - Category: indicated - Tonnes: 2968518 - Grade: 0.81 - Grade Unit: g/t #### Prior Estimate - Resource Date: 2026-09-20 #### Metal Equivalent - Assumptions Disclosed: Yes #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-09-22T00:00:00.000Z Reasoning: Indicated gold byproduct. Evidence · table > 0.81 Context: 2,968,518 #### Tags used in scoring **Indicated Resource** Polarity: positive Definition: Reasonable geological confidence based on adequate drilling; continuity can be assumed. Basis for Probable Reserves. Why it applies: category is "indicated" **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 **QP/CP Signed** Polarity: positive 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: qp\_signed is true **NI 43-101 Compliant** Polarity: positive Definition: Resource estimate prepared in compliance with NI 43-101 \(Canada\) — high reporting standard. Why it applies: reporting\_standards includes ni\_43\_101 **No Contained Metal** Polarity: negative Definition: Tonnage and grade reported but contained metal not calculated or disclosed — incomplete reporting. Why it applies: contained\_metal was not reported **Resource Update** Polarity: neutral Definition: Revised estimate for an existing resource — compare to prior to assess progress. Why it applies: the release compares against a previous estimate ### indicated [Link to this fact](https://atlas-staging.minestarters.com/news/errington-metals-announces-maiden-mineral-resource-estimate-for-the-sudbury-basi--bbb1c514-9795-4b6f-b9a9-5240ab9d2f14#fact-resource-facts-9) Sudbury Basin Project · silver #### Identity - Project: Sudbury Basin Project - Commodity: silver - Region: sudbury basin - Reported Region: Sudbury Basin - Ticker: EM #### Resource scope - Estimate type: resource - Effective date: 2026-09-20T00:00:00.000Z - Reporting standards: ni\_43\_101 - QP Signed: Yes - Qualified person names: Ryan Wilson - Resource group id: resource:54a5adfc84269efae504 - Deposit or zone: Errington - Mining method: underground #### Resource Data - Category: indicated - Tonnes: 2968518 - Grade: 54.58 - Grade Unit: g/t #### Prior Estimate - Resource Date: 2026-09-20 #### Metal Equivalent - Assumptions Disclosed: Yes #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-09-22T00:00:00.000Z Reasoning: Indicated silver byproduct. Evidence · table > 54.58 Context: 2,968,518 #### Tags used in scoring **Indicated Resource** Polarity: positive Definition: Reasonable geological confidence based on adequate drilling; continuity can be assumed. Basis for Probable Reserves. Why it applies: category is "indicated" **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 **QP/CP Signed** Polarity: positive 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: qp\_signed is true **NI 43-101 Compliant** Polarity: positive Definition: Resource estimate prepared in compliance with NI 43-101 \(Canada\) — high reporting standard. Why it applies: reporting\_standards includes ni\_43\_101 **No Contained Metal** Polarity: negative Definition: Tonnage and grade reported but contained metal not calculated or disclosed — incomplete reporting. Why it applies: contained\_metal was not reported **Resource Update** Polarity: neutral Definition: Revised estimate for an existing resource — compare to prior to assess progress. Why it applies: the release compares against a previous estimate ### inferred [Link to this fact](https://atlas-staging.minestarters.com/news/errington-metals-announces-maiden-mineral-resource-estimate-for-the-sudbury-basi--bbb1c514-9795-4b6f-b9a9-5240ab9d2f14#fact-resource-facts-10) Sudbury Basin Project · copper #### Identity - Project: Sudbury Basin Project - Commodity: copper - Region: sudbury basin - Reported Region: Sudbury Basin - Ticker: EM #### Resource scope - Estimate type: resource - Effective date: 2026-09-20T00:00:00.000Z - Reporting standards: ni\_43\_101 - QP Signed: Yes - Qualified person names: Ryan Wilson - Resource group id: resource:e629dc5ca4244098c207 - Deposit or zone: Errington - Mining method: underground #### Resource Data - Category: inferred - Tonnes: 804289 - Grade: 1.24 - Grade Unit: % #### Prior Estimate - Resource Date: 2026-09-20 #### Metal Equivalent - Assumptions Disclosed: Yes #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-09-22T00:00:00.000Z Reasoning: Inferred copper resource at Errington. - Positive factor: Newly recognized inferred resources - Negative factor: Inferred category has lower confidence Evidence · table > 1.24 Context: 804,289 #### Tags used in scoring **Inferred Resource** Polarity: negative Definition: Speculative category — limited drilling, geological continuity assumed but not confirmed. Cannot support economic studies alone. Why it applies: category is "inferred" **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 **QP/CP Signed** Polarity: positive 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: qp\_signed is true **NI 43-101 Compliant** Polarity: positive Definition: Resource estimate prepared in compliance with NI 43-101 \(Canada\) — high reporting standard. Why it applies: reporting\_standards includes ni\_43\_101 **No Contained Metal** Polarity: negative Definition: Tonnage and grade reported but contained metal not calculated or disclosed — incomplete reporting. Why it applies: contained\_metal was not reported **Resource Update** Polarity: neutral Definition: Revised estimate for an existing resource — compare to prior to assess progress. Why it applies: the release compares against a previous estimate ### inferred [Link to this fact](https://atlas-staging.minestarters.com/news/errington-metals-announces-maiden-mineral-resource-estimate-for-the-sudbury-basi--bbb1c514-9795-4b6f-b9a9-5240ab9d2f14#fact-resource-facts-11) Sudbury Basin Project · zinc #### Identity - Project: Sudbury Basin Project - Commodity: zinc - Region: sudbury basin - Reported Region: Sudbury Basin - Ticker: EM #### Resource scope - Estimate type: resource - Effective date: 2026-09-20T00:00:00.000Z - Reporting standards: ni\_43\_101 - QP Signed: Yes - Qualified person names: Ryan Wilson - Resource group id: resource:e629dc5ca4244098c207 - Deposit or zone: Errington - Mining method: underground #### Resource Data - Category: inferred - Tonnes: 804289 - Grade: 4.3 - Grade Unit: % #### Prior Estimate - Resource Date: 2026-09-20 #### Metal Equivalent - Assumptions Disclosed: Yes #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-09-22T00:00:00.000Z Reasoning: Inferred zinc resource at Errington. Evidence · table > 4.30 Context: 804,289 #### Tags used in scoring **Inferred Resource** Polarity: negative Definition: Speculative category — limited drilling, geological continuity assumed but not confirmed. Cannot support economic studies alone. Why it applies: category is "inferred" **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 **QP/CP Signed** Polarity: positive 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: qp\_signed is true **NI 43-101 Compliant** Polarity: positive Definition: Resource estimate prepared in compliance with NI 43-101 \(Canada\) — high reporting standard. Why it applies: reporting\_standards includes ni\_43\_101 **No Contained Metal** Polarity: negative Definition: Tonnage and grade reported but contained metal not calculated or disclosed — incomplete reporting. Why it applies: contained\_metal was not reported **Resource Update** Polarity: neutral Definition: Revised estimate for an existing resource — compare to prior to assess progress. Why it applies: the release compares against a previous estimate ### inferred [Link to this fact](https://atlas-staging.minestarters.com/news/errington-metals-announces-maiden-mineral-resource-estimate-for-the-sudbury-basi--bbb1c514-9795-4b6f-b9a9-5240ab9d2f14#fact-resource-facts-12) Sudbury Basin Project · lead #### Identity - Project: Sudbury Basin Project - Commodity: lead - Region: sudbury basin - Reported Region: Sudbury Basin - Ticker: EM #### Resource scope - Estimate type: resource - Effective date: 2026-09-20T00:00:00.000Z - Reporting standards: ni\_43\_101 - QP Signed: Yes - Qualified person names: Ryan Wilson - Resource group id: resource:e629dc5ca4244098c207 - Deposit or zone: Errington - Mining method: underground #### Resource Data - Category: inferred - Tonnes: 804289 - Grade: 1.2 - Grade Unit: % #### Prior Estimate - Resource Date: 2026-09-20 #### Metal Equivalent - Assumptions Disclosed: Yes #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-09-22T00:00:00.000Z Reasoning: Inferred lead byproduct. Evidence · table > 1.20 Context: 804,289 #### Tags used in scoring **Inferred Resource** Polarity: negative Definition: Speculative category — limited drilling, geological continuity assumed but not confirmed. Cannot support economic studies alone. Why it applies: category is "inferred" **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 **QP/CP Signed** Polarity: positive 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: qp\_signed is true **NI 43-101 Compliant** Polarity: positive Definition: Resource estimate prepared in compliance with NI 43-101 \(Canada\) — high reporting standard. Why it applies: reporting\_standards includes ni\_43\_101 **No Contained Metal** Polarity: negative Definition: Tonnage and grade reported but contained metal not calculated or disclosed — incomplete reporting. Why it applies: contained\_metal was not reported **Resource Update** Polarity: neutral Definition: Revised estimate for an existing resource — compare to prior to assess progress. Why it applies: the release compares against a previous estimate ### inferred [Link to this fact](https://atlas-staging.minestarters.com/news/errington-metals-announces-maiden-mineral-resource-estimate-for-the-sudbury-basi--bbb1c514-9795-4b6f-b9a9-5240ab9d2f14#fact-resource-facts-13) Sudbury Basin Project · gold #### Identity - Project: Sudbury Basin Project - Commodity: gold - Region: sudbury basin - Reported Region: Sudbury Basin - Ticker: EM #### Resource scope - Estimate type: resource - Effective date: 2026-09-20T00:00:00.000Z - Reporting standards: ni\_43\_101 - QP Signed: Yes - Qualified person names: Ryan Wilson - Resource group id: resource:e629dc5ca4244098c207 - Deposit or zone: Errington - Mining method: underground #### Resource Data - Category: inferred - Tonnes: 804289 - Grade: 0.79 - Grade Unit: g/t #### Prior Estimate - Resource Date: 2026-09-20 #### Metal Equivalent - Assumptions Disclosed: Yes #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-09-22T00:00:00.000Z Reasoning: Inferred gold byproduct. Evidence · table > 0.79 Context: 804,289 #### Tags used in scoring **Inferred Resource** Polarity: negative Definition: Speculative category — limited drilling, geological continuity assumed but not confirmed. Cannot support economic studies alone. Why it applies: category is "inferred" **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 **QP/CP Signed** Polarity: positive 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: qp\_signed is true **NI 43-101 Compliant** Polarity: positive Definition: Resource estimate prepared in compliance with NI 43-101 \(Canada\) — high reporting standard. Why it applies: reporting\_standards includes ni\_43\_101 **No Contained Metal** Polarity: negative Definition: Tonnage and grade reported but contained metal not calculated or disclosed — incomplete reporting. Why it applies: contained\_metal was not reported **Resource Update** Polarity: neutral Definition: Revised estimate for an existing resource — compare to prior to assess progress. Why it applies: the release compares against a previous estimate ### inferred [Link to this fact](https://atlas-staging.minestarters.com/news/errington-metals-announces-maiden-mineral-resource-estimate-for-the-sudbury-basi--bbb1c514-9795-4b6f-b9a9-5240ab9d2f14#fact-resource-facts-14) Sudbury Basin Project · silver #### Identity - Project: Sudbury Basin Project - Commodity: silver - Region: sudbury basin - Reported Region: Sudbury Basin - Ticker: EM #### Resource scope - Estimate type: resource - Effective date: 2026-09-20T00:00:00.000Z - Reporting standards: ni\_43\_101 - QP Signed: Yes - Qualified person names: Ryan Wilson - Resource group id: resource:e629dc5ca4244098c207 - Deposit or zone: Errington - Mining method: underground #### Resource Data - Category: inferred - Tonnes: 804289 - Grade: 51.79 - Grade Unit: g/t #### Prior Estimate - Resource Date: 2026-09-20 #### Metal Equivalent - Assumptions Disclosed: Yes #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-09-22T00:00:00.000Z Reasoning: Inferred silver byproduct. Evidence · table > 51.79 Context: 804,289 #### Tags used in scoring **Inferred Resource** Polarity: negative Definition: Speculative category — limited drilling, geological continuity assumed but not confirmed. Cannot support economic studies alone. Why it applies: category is "inferred" **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 **QP/CP Signed** Polarity: positive 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: qp\_signed is true **NI 43-101 Compliant** Polarity: positive Definition: Resource estimate prepared in compliance with NI 43-101 \(Canada\) — high reporting standard. Why it applies: reporting\_standards includes ni\_43\_101 **No Contained Metal** Polarity: negative Definition: Tonnage and grade reported but contained metal not calculated or disclosed — incomplete reporting. Why it applies: contained\_metal was not reported **Resource Update** Polarity: neutral Definition: Revised estimate for an existing resource — compare to prior to assess progress. Why it applies: the release compares against a previous estimate ## 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.