# PRB: MAIDEN AIRCORE PROGRAM COMPLETED AT BRIANS MILL Canonical Atlas analysis: https://atlas-staging.minestarters.com/news/prb-maiden-aircore-program-completed-at-brians-mill--c4b6b6a7-0c9e-4558-b0af-bdcc05669c3a Original source: https://www.asx.com.au/asx/v2/statistics/displayAnnouncement.do?display=pdf&idsId=03147088 Publisher: asx Original announcement: 2026-09-30T23:26:00.000Z Analysis by Minestarters Atlas Atlas analysis published: 2026-10-01T00:15:59.896Z Atlas analysis updated: 2026-10-01T00:15:59.896Z - Company: Parbo Resources Limited - Ticker: PRB - Exchange: ASX - Region: Western Australia - Primary commodity: Gold - Secondary commodities: Copper - Document categories: Drill results - Extracted: 2026-10-01 00:16:00 UTC Narrative sentiment: 0.10 · Bullish ## Minestarters Atlas summary Parbo Resources Limited has completed its maiden aircore drilling program at the Brians Mill gold prospect in Western Australia, comprising 75 holes for 4,737m. The program tested both the Brians Mill South area, targeting historic gold intercepts, and the Brians Mill North area, with first-pass drilling along a new structural corridor. Field logging identified alteration consistent with the company's geological model, and assay results are expected in late October 2026. The announcement also re-states several historical gold and copper intercepts from previous drilling campaigns. Reasoning: The company announced the completion of a maiden aircore drilling program and encouraging field observations, with assay results pending. The release also re-states previously reported historical drill intercepts, which are not new information and lack QA/QC data. - Positive factor: Maiden drilling program completed on schedule - Positive factor: Field observations consistent with geological model - Positive factor: Assay results for new drilling expected soon - Positive factor: First-pass drilling in a new structural corridor - Negative factor: No new assay results reported in this announcement - Negative factor: Historical results are not new information - Negative factor: True widths of historical intercepts are not known - Negative factor: No QA/QC data available for historical results Facts used in scoring: 7 ## Classification and evidence **Stale Data Re-release** Polarity: negative Definition: Historical results re-announced with no new assays or reinterpretation — low genuine novelty. Why it applies: The historical drill results are explicitly stated as 'previously reported in the Company's Prospectus dated 5 August 2026'. Evidence · text > Brians Mill South drilling surrounds historic gold intercepts including 6m @ 2.35g/t Au from 17m \(NAC001\) and 5m @ 1.79g/t Au from 24m \(NAC015\)¹. **No QA/QC Disclosure** Polarity: negative Definition: Release does not disclose QA/QC — lab certification, CP/QP sign-off and assay protocols cannot be checked from this document. Why it applies: The JORC Table 1 explicitly states 'No QAQC data is available for the historic results' for the historic drilling. Evidence · table > No QAQC data is available for the historic results. Context: Quality of assay data and laboratory tests **Apparent Width Only** Polarity: negative Definition: Interval given as downhole width with no true width or drill orientation — apparent width may overstate true thickness. Why it applies: The document states 'All historic intercepts are downhole lengths. The geometry of mineralisation is not known and true widths are not known.' Evidence · text > All historic intercepts are downhole lengths. The geometry of mineralisation is not known and true widths are not known. ## Extracted facts Stored fact records: 7. Some facts used in scoring do not have a stored record. ## Drill Results (7) ### NAC001 [Link to this fact](https://atlas-staging.minestarters.com/news/prb-maiden-aircore-program-completed-at-brians-mill--c4b6b6a7-0c9e-4558-b0af-bdcc05669c3a#fact-drill-facts-0) Brians Mill Gold Prospect · gold Historical result Needs review: historical\_restatement #### Identity - Hole ID: NAC001 - Project: Brians Mill Gold Prospect - Commodity: gold - Region: australia\_wa - Reported Region: australia\_wa - Ticker: PRB #### Geometry - Grade: 2.35 - Grade Unit: g/t - Intercept: 6 m - From: 17 m - To: 23 m - Hole Depth: 44 m - Intercept Depth: 17 m #### Classification - Deposit Type: orogenic - Program: exploration - Sample Type: drill - Group ID: NAC001:17-23 - Mining Method: unknown #### Location - Easting: 661605 - Northing: 7134004 - Elevation: 510 m - Azimuth: 180 ° - Dip: -60 ° - Loc. Confidence: medium - Loc. Source: document #### QA/QC - QA/QC Disclosed: Yes - QP Signed: No - QA/QC Methods: standards, blanks, duplicates #### Compositing - Cutoff Grade: 0.6 - Cutoff Unit: g/t - Dilution Disclosed: Yes - Max Dilution: 4 m #### Review - Needs Review: Yes - Review Reason: historical\_restatement - Interp. Status: scored - Historical: Yes - Historical Source Date: 2026-08-05T00:00:00.000Z #### Dates - Event date: 2026-09-30T00:00:00.000Z Reasoning: This is a historical gold intercept of moderate grade and width, but it lacks QA/QC data and true width information, and is not new information. - Negative factor: No QA/QC data available for historic results - Negative factor: True width not known - Negative factor: Result is historical and previously reported Evidence · table > 2.35 g/t Au Context: 6 #### Tags used in scoring **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 **Compositing Transparent** Polarity: positive Definition: Cut-off grade and internal dilution rules are clearly stated for reported intervals. Why it applies: cutoff\_grade and internal dilution are both stated **Stale Data Re-release** Polarity: negative Definition: Historical results re-announced with no new assays or reinterpretation — low genuine novelty. Why it applies: the fact restates a prior release ### NAC001 [Link to this fact](https://atlas-staging.minestarters.com/news/prb-maiden-aircore-program-completed-at-brians-mill--c4b6b6a7-0c9e-4558-b0af-bdcc05669c3a#fact-drill-facts-1) Brians Mill Gold Prospect · copper Historical result Needs review: historical\_restatement #### Identity - Hole ID: NAC001 - Project: Brians Mill Gold Prospect - Commodity: copper - Region: australia\_wa - Reported Region: australia\_wa - Ticker: PRB #### Geometry - Grade: 0.05 - Grade Unit: % - Intercept: 2 m - From: 17 m - To: 19 m - Hole Depth: 44 m - Intercept Depth: 17 m #### Classification - Deposit Type: orogenic - Program: exploration - Sample Type: drill - Group ID: NAC001:17-19 - Mining Method: unknown #### Location - Easting: 661605 - Northing: 7134004 - Elevation: 510 m - Azimuth: 180 ° - Dip: -60 ° - Loc. Confidence: medium - Loc. Source: document #### QA/QC - QA/QC Disclosed: Yes - QP Signed: No - QA/QC Methods: standards, blanks, duplicates #### Compositing - Cutoff Grade: 0.04 - Cutoff Unit: % - Dilution Disclosed: Yes - Max Dilution: 4 m #### Review - Needs Review: Yes - Review Reason: historical\_restatement - Interp. Status: scored - Historical: Yes - Historical Source Date: 2026-08-05T00:00:00.000Z #### Dates - Event date: 2026-09-30T00:00:00.000Z Reasoning: This is a historical copper intercept of low grade and narrow width, lacking QA/QC data and true width information, and is not new information. - Negative factor: No QA/QC data available for historic results - Negative factor: True width not known - Negative factor: Result is historical and previously reported Evidence · table > 0.05% Cu Context: 2 #### Tags used in scoring **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 **Compositing Transparent** Polarity: positive Definition: Cut-off grade and internal dilution rules are clearly stated for reported intervals. Why it applies: cutoff\_grade and internal dilution are both stated **Stale Data Re-release** Polarity: negative Definition: Historical results re-announced with no new assays or reinterpretation — low genuine novelty. Why it applies: the fact restates a prior release ### NAC011 [Link to this fact](https://atlas-staging.minestarters.com/news/prb-maiden-aircore-program-completed-at-brians-mill--c4b6b6a7-0c9e-4558-b0af-bdcc05669c3a#fact-drill-facts-2) Brians Mill Gold Prospect · copper Historical result Needs review: historical\_restatement #### Identity - Hole ID: NAC011 - Project: Brians Mill Gold Prospect - Commodity: copper - Region: australia\_wa - Reported Region: australia\_wa - Ticker: PRB #### Geometry - Grade: 0.05 - Grade Unit: % - Intercept: 13 m - From: 37 m - To: 50 m - Hole Depth: 55 m - Intercept Depth: 37 m #### Classification - Deposit Type: orogenic - Program: exploration - Sample Type: drill - Group ID: NAC011:37-50 - Mining Method: unknown #### Location - Easting: 661000 - Northing: 7134000 - Elevation: 510 m - Azimuth: 0 ° - Dip: -90 ° - Loc. Confidence: medium - Loc. Source: document #### QA/QC - QA/QC Disclosed: Yes - QP Signed: No - QA/QC Methods: standards, blanks, duplicates #### Compositing - Cutoff Grade: 0.04 - Cutoff Unit: % - Dilution Disclosed: Yes - Max Dilution: 4 m #### Review - Needs Review: Yes - Review Reason: historical\_restatement - Interp. Status: scored - Historical: Yes - Historical Source Date: 2026-08-05T00:00:00.000Z #### Dates - Event date: 2026-09-30T00:00:00.000Z Reasoning: This is a historical copper intercept of low grade, lacking QA/QC data and true width information, and is not new information. - Negative factor: No QA/QC data available for historic results - Negative factor: True width not known - Negative factor: Result is historical and previously reported Evidence · table > 0.05% Cu Context: 13 #### Tags used in scoring **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 **Compositing Transparent** Polarity: positive Definition: Cut-off grade and internal dilution rules are clearly stated for reported intervals. Why it applies: cutoff\_grade and internal dilution are both stated **Stale Data Re-release** Polarity: negative Definition: Historical results re-announced with no new assays or reinterpretation — low genuine novelty. Why it applies: the fact restates a prior release ### NAC015 [Link to this fact](https://atlas-staging.minestarters.com/news/prb-maiden-aircore-program-completed-at-brians-mill--c4b6b6a7-0c9e-4558-b0af-bdcc05669c3a#fact-drill-facts-3) Brians Mill Gold Prospect · gold Historical result Needs review: historical\_restatement #### Identity - Hole ID: NAC015 - Project: Brians Mill Gold Prospect - Commodity: gold - Region: australia\_wa - Reported Region: australia\_wa - Ticker: PRB #### Geometry - Grade: 1.79 - Grade Unit: g/t - Intercept: 5 m - From: 24 m - To: 29 m - Hole Depth: 47 m - Intercept Depth: 24 m #### Classification - Deposit Type: orogenic - Program: exploration - Sample Type: drill - Group ID: NAC015:24-29 - Mining Method: unknown #### Location - Easting: 661500 - Northing: 7134027 - Elevation: 510 m - Azimuth: 0 ° - Dip: -90 ° - Loc. Confidence: medium - Loc. Source: document #### QA/QC - QA/QC Disclosed: Yes - QP Signed: No - QA/QC Methods: standards, blanks, duplicates #### Compositing - Cutoff Grade: 0.6 - Cutoff Unit: g/t - Dilution Disclosed: Yes - Max Dilution: 4 m #### Review - Needs Review: Yes - Review Reason: historical\_restatement - Interp. Status: scored - Historical: Yes - Historical Source Date: 2026-08-05T00:00:00.000Z #### Dates - Event date: 2026-09-30T00:00:00.000Z Reasoning: This is a historical gold intercept of moderate grade and width, but it lacks QA/QC data and true width information, and is not new information. - Negative factor: No QA/QC data available for historic results - Negative factor: True width not known - Negative factor: Result is historical and previously reported Evidence · table > 1.79 g/t Au Context: 5 #### Tags used in scoring **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 **Compositing Transparent** Polarity: positive Definition: Cut-off grade and internal dilution rules are clearly stated for reported intervals. Why it applies: cutoff\_grade and internal dilution are both stated **Stale Data Re-release** Polarity: negative Definition: Historical results re-announced with no new assays or reinterpretation — low genuine novelty. Why it applies: the fact restates a prior release ### NAC027 [Link to this fact](https://atlas-staging.minestarters.com/news/prb-maiden-aircore-program-completed-at-brians-mill--c4b6b6a7-0c9e-4558-b0af-bdcc05669c3a#fact-drill-facts-4) Brians Mill Gold Prospect · gold Historical result Needs review: historical\_restatement #### Identity - Hole ID: NAC027 - Project: Brians Mill Gold Prospect - Commodity: gold - Region: australia\_wa - Reported Region: australia\_wa - Ticker: PRB #### Geometry - Grade: 0.93 - Grade Unit: g/t - Intercept: 8 m - From: 23 m - To: 31 m - Hole Depth: 35 m - Intercept Depth: 23 m #### Classification - Deposit Type: orogenic - Program: exploration - Sample Type: drill - Group ID: NAC027:23-31 - Mining Method: unknown #### Location - Easting: 661549 - Northing: 7134025 - Elevation: 510 m - Azimuth: 180 ° - Dip: -60 ° - Loc. Confidence: medium - Loc. Source: document #### QA/QC - QA/QC Disclosed: Yes - QP Signed: No - QA/QC Methods: standards, blanks, duplicates #### Compositing - Cutoff Grade: 0.6 - Cutoff Unit: g/t - Dilution Disclosed: Yes - Max Dilution: 4 m #### Review - Needs Review: Yes - Review Reason: historical\_restatement - Interp. Status: scored - Historical: Yes - Historical Source Date: 2026-08-05T00:00:00.000Z #### Dates - Event date: 2026-09-30T00:00:00.000Z Reasoning: This is a historical gold intercept of moderate width but low grade, lacking QA/QC data and true width information, and is not new information. - Negative factor: No QA/QC data available for historic results - Negative factor: True width not known - Negative factor: Result is historical and previously reported Evidence · table > 0.93 g/t Au Context: 8 #### Tags used in scoring **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 **Compositing Transparent** Polarity: positive Definition: Cut-off grade and internal dilution rules are clearly stated for reported intervals. Why it applies: cutoff\_grade and internal dilution are both stated **Stale Data Re-release** Polarity: negative Definition: Historical results re-announced with no new assays or reinterpretation — low genuine novelty. Why it applies: the fact restates a prior release ### NAC030 [Link to this fact](https://atlas-staging.minestarters.com/news/prb-maiden-aircore-program-completed-at-brians-mill--c4b6b6a7-0c9e-4558-b0af-bdcc05669c3a#fact-drill-facts-5) Brians Mill Gold Prospect · gold Historical result Needs review: historical\_restatement #### Identity - Hole ID: NAC030 - Project: Brians Mill Gold Prospect - Commodity: gold - Region: australia\_wa - Reported Region: australia\_wa - Ticker: PRB #### Geometry - Grade: 0.48 - Grade Unit: g/t - Intercept: 6 m - From: 31 m - To: 37 m - Hole Depth: 44 m - Intercept Depth: 31 m #### Classification - Deposit Type: orogenic - Program: exploration - Sample Type: drill - Group ID: NAC030:31-37 - Mining Method: unknown #### Location - Easting: 661573 - Northing: 7134010 - Elevation: 510 m - Azimuth: 180 ° - Dip: -60 ° - Loc. Confidence: medium - Loc. Source: document #### QA/QC - QA/QC Disclosed: Yes - QP Signed: No - QA/QC Methods: standards, blanks, duplicates #### Compositing - Cutoff Grade: 0.6 - Cutoff Unit: g/t - Dilution Disclosed: Yes - Max Dilution: 4 m #### Review - Needs Review: Yes - Review Reason: historical\_restatement - Interp. Status: scored - Historical: Yes - Historical Source Date: 2026-08-05T00:00:00.000Z #### Dates - Event date: 2026-09-30T00:00:00.000Z Reasoning: This is a historical gold intercept with a grade below the stated cut-off, lacking QA/QC data and true width information, and is not new information. - Negative factor: Grade is below stated cut-off for reporting - Negative factor: No QA/QC data available for historic results - Negative factor: True width not known - Negative factor: Result is historical and previously reported Evidence · table > 0.48 g/t Au Context: 6 #### Tags used in scoring **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 **Compositing Transparent** Polarity: positive Definition: Cut-off grade and internal dilution rules are clearly stated for reported intervals. Why it applies: cutoff\_grade and internal dilution are both stated **Stale Data Re-release** Polarity: negative Definition: Historical results re-announced with no new assays or reinterpretation — low genuine novelty. Why it applies: the fact restates a prior release ### NAC031 [Link to this fact](https://atlas-staging.minestarters.com/news/prb-maiden-aircore-program-completed-at-brians-mill--c4b6b6a7-0c9e-4558-b0af-bdcc05669c3a#fact-drill-facts-6) Brians Mill Gold Prospect · gold Historical result Needs review: historical\_restatement #### Identity - Hole ID: NAC031 - Project: Brians Mill Gold Prospect - Commodity: gold - Region: australia\_wa - Reported Region: australia\_wa - Ticker: PRB #### Geometry - Grade: 1.01 - Grade Unit: g/t - Intercept: 8 m - From: 30 m - To: 38 m - Hole Depth: 50 m - Intercept Depth: 30 m #### Classification - Deposit Type: orogenic - Program: exploration - Sample Type: drill - Group ID: NAC031:30-38 - Mining Method: unknown #### Location - Easting: 661574 - Northing: 7134020 - Elevation: 510 m - Azimuth: 180 ° - Dip: -60 ° - Loc. Confidence: medium - Loc. Source: document #### QA/QC - QA/QC Disclosed: Yes - QP Signed: No - QA/QC Methods: standards, blanks, duplicates #### Compositing - Cutoff Grade: 0.6 - Cutoff Unit: g/t - Dilution Disclosed: Yes - Max Dilution: 4 m #### Review - Needs Review: Yes - Review Reason: historical\_restatement - Interp. Status: scored - Historical: Yes - Historical Source Date: 2026-08-05T00:00:00.000Z #### Dates - Event date: 2026-09-30T00:00:00.000Z Reasoning: This is a historical gold intercept of moderate width but low grade, lacking QA/QC data and true width information, and is not new information. - Negative factor: No QA/QC data available for historic results - Negative factor: True width not known - Negative factor: Result is historical and previously reported Evidence · table > 1.01 g/t Au Context: 8 #### Tags used in scoring **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 **Compositing Transparent** Polarity: positive Definition: Cut-off grade and internal dilution rules are clearly stated for reported intervals. Why it applies: cutoff\_grade and internal dilution are both stated **Stale Data Re-release** Polarity: negative Definition: Historical results re-announced with no new assays or reinterpretation — low genuine novelty. Why it applies: the fact restates a prior release ## 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.