# Mining News in Montana

Canonical page: https://atlas-staging.minestarters.com/news?regions=usa_mt

Atlas summarizes and classifies mining-industry stories from third-party publishers. Follow each source link for the original reporting.

Results: 47
Returned: 10
Coverage: drill results, resource updates, and metallurgy; primary commodity matching; all time unless dates are supplied.
Region: Montana (usa_mt)
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## Stillwater Critical Minerals Files NI 43-101 Technical Report for the Updated Stillwater West Mineral Resource Estimate in Montana, USA

- Atlas analysis: [Read analysis](https://atlas-staging.minestarters.com/news/stillwater-critical-minerals-files-ni-43-101-technical-report-for-the-updated-st--b13fb8d1-1b5a-47a9-acdc-8e1f5b582b1d) · [Markdown](https://atlas-staging.minestarters.com/news/stillwater-critical-minerals-files-ni-43-101-technical-report-for-the-updated-st--b13fb8d1-1b5a-47a9-acdc-8e1f5b582b1d.md)
- Original announcement: 2026-10-19T11:00:00.000Z
- Atlas analysis published: 2026-10-19T12:17:40.412Z
- Atlas analysis updated: 2026-10-19T12:17:40.412Z
- Company: Stillwater Critical Minerals Corp. (PGE)
- Original source: [orestocks](https://orestocks.com/company/PGE.V/press-releases/6321116261527606)
- Atlas sentiment: 0.441
- Atlas tags: Category Upgrade, NI 43-101 Compliant, QP/CP Signed

Stillwater Critical Minerals has filed an NI 43-101 Technical Report for its Stillwater West project in Montana. The report supports an updated Mineral Resource Estimate that establishes the project's first Indicated Resource and significantly expands the Inferred Resource.

## Stillwater Critical Minerals Files NI 43-101 Technical Report for the Updated Stillwater West Mineral Resource Estimate in Montana, USA

- Atlas analysis: [Read analysis](https://atlas-staging.minestarters.com/news/stillwater-critical-minerals-files-ni-43-101-technical-report-for-the-updated-st--20de4e94-bd00-433e-bab8-8a23cce45675) · [Markdown](https://atlas-staging.minestarters.com/news/stillwater-critical-minerals-files-ni-43-101-technical-report-for-the-updated-st--20de4e94-bd00-433e-bab8-8a23cce45675.md)
- Original announcement: 2026-10-19T00:37:00.000Z
- Atlas analysis published: 2026-10-19T12:39:34.628Z
- Atlas analysis updated: 2026-10-19T12:39:34.628Z
- Company: Stillwater Critical Minerals Corp. (PGE)
- Original source: [jmn](https://www.juniorminingnetwork.com/junior-miner-news/press-releases/677-tsx-venture/pge/213076-stillwater-critical-minerals-files-ni-43-101-technical-report-for-the-updated-stillwater-west-mineral-resource-estimate-in-montana-usa.html)
- Atlas sentiment: 0.479
- Atlas tags: NI 43-101 Compliant, Indicated Resource

Stillwater Critical Minerals has filed an NI 43-101 Technical Report supporting its updated 2026 Mineral Resource Estimate at the Stillwater West project in Montana. The estimate includes a maiden Indicated Resource of 29.4 Mt at 0.38% NiTEq and an expanded Inferred Resource of 805.1 Mt at 0.34% NiTEq.

## Stillwater Critical Minerals Files NI 43-101 Technical Report for the Updated Stillwater West Mineral Resource Estimate in Montana, USA

- Atlas analysis: [Read analysis](https://atlas-staging.minestarters.com/news/stillwater-critical-minerals-files-ni-43-101-technical-report-for-the-updated-st--c2a4f998-d48a-44b3-8d82-9da3ccbdddbd) · [Markdown](https://atlas-staging.minestarters.com/news/stillwater-critical-minerals-files-ni-43-101-technical-report-for-the-updated-st--c2a4f998-d48a-44b3-8d82-9da3ccbdddbd.md)
- Original announcement: 2026-10-19T00:00:00.000Z
- Atlas analysis published: 2026-10-19T13:49:24.997Z
- Atlas analysis updated: 2026-10-19T13:49:24.997Z
- Company: Stillwater Critical Minerals Corp. (PGE)
- Original source: [prospectors_exchange](https://criticalminerals.com/news/2026/stillwater-critical-minerals-files-ni-43-101-technical-report-for-the-updated-stillwater-west-mineral-resource-estimate-in/)
- Atlas sentiment: 0.462
- Atlas tags: Category Upgrade, NI 43-101 Compliant

Stillwater Critical Minerals has filed an NI 43-101 Technical Report supporting its updated Stillwater West Mineral Resource Estimate. The update establishes the project's first Indicated Resource of 29.4 Mt at 0.38% NiTEq and expands the Inferred Resource to 805.1 Mt at 0.34% NiTEq.

## Red Mountain Mining takes a closer look at Pioneer’s copper clues

- Atlas analysis: [Read analysis](https://atlas-staging.minestarters.com/news/red-mountain-mining-takes-a-closer-look-at-pioneer-s-copper-clues--96386b29-28a1-4f85-8ada-aa14dde561cb) · [Markdown](https://atlas-staging.minestarters.com/news/red-mountain-mining-takes-a-closer-look-at-pioneer-s-copper-clues--96386b29-28a1-4f85-8ada-aa14dde561cb.md)
- Original announcement: 2026-10-15T01:56:57.000Z
- Atlas analysis published: 2026-10-15T03:03:22.458Z
- Atlas analysis updated: 2026-10-15T03:03:22.458Z
- Company: Red Mountain Mining (RMX)
- Original source: [stockhead](https://stockhead.com.au/resources/red-mountain-mining-takes-a-closer-look-at-pioneers-copper-clues/)
- Atlas sentiment: 0.421
- Atlas tags: Nearology Play

Red Mountain Mining is expanding its exploration focus at the Pioneer project in Montana following high-grade copper rock-chip assays. The company plans to conduct mapping and sampling to rank targets for a planned 2027 drilling campaign.

## Red Mountain Mining Limited Exploration Results Highlight Copper Potential at Pioneer

- Atlas analysis: [Read analysis](https://atlas-staging.minestarters.com/news/red-mountain-mining-limited-exploration-results-highlight-copper-potential-at-pi--576cc9be-27c1-48ac-af4d-ad3850cf4d18) · [Markdown](https://atlas-staging.minestarters.com/news/red-mountain-mining-limited-exploration-results-highlight-copper-potential-at-pi--576cc9be-27c1-48ac-af4d-ad3850cf4d18.md)
- Original announcement: 2026-10-15T00:37:00.000Z
- Atlas analysis published: 2026-10-15T02:32:50.336Z
- Atlas analysis updated: 2026-10-15T02:32:50.336Z
- Company: Red Mountain Mining Limited (RMX)
- Original source: [investingnews](https://investingnews.com/red-mountain-mining-limited-exploration-results-highlight-copper-potential-at-pioneer/)
- Atlas sentiment: 0.358
- Atlas tags: Nearology Play

Red Mountain Mining has reported high-grade copper rock chip samples of up to 19.15% Cu at the Pioneer Tungsten Project in Montana. The sampling, conducted at the Mammoth, Greenstone, and Glow Worm prospects, indicates significant copper potential associated with garnet skarn mineralisation.

## SNM: Northern drilling extends mineralisation beyond current MRE

- Atlas analysis: [Read analysis](https://atlas-staging.minestarters.com/news/snm-northern-drilling-extends-mineralisation-beyond-current-mre--793bf9b5-a471-4bad-9601-368965df0b3d) · [Markdown](https://atlas-staging.minestarters.com/news/snm-northern-drilling-extends-mineralisation-beyond-current-mre--793bf9b5-a471-4bad-9601-368965df0b3d.md)
- Original announcement: 2026-10-12T22:50:00.000Z
- Atlas analysis published: 2026-10-12T23:13:52.510Z
- Atlas analysis updated: 2026-10-12T23:13:52.510Z
- Company: Sentinel Metals Limited (SNM)
- Original source: [asx](https://www.asx.com.au/asx/v2/statistics/displayAnnouncement.do?display=pdf&idsId=03151614)
- Atlas sentiment: 0.586
- Atlas tags: QA/QC Disclosed, Cut-off Disclosed, Apparent Width Only

Sentinel Metals Limited has reported additional drill results from its 2026 program at the Columbia Gold-Silver Project in Montana, USA, confirming broad gold mineralization and extending it beyond the current Mineral Resource pit shell. Notable intercepts include 21.7m at 2.19g/t Au from DDCO26-011 and 9.1m at 2.56g/t Au from DDCO26-010, with some mineralization lying outside the existing pit shell. These results, along with pending assays for the final four holes, will be incorporated into an updated Mineral Resource Estimate in November 2026.

## Rudyard – Ollie #1 Well Completion

- Atlas analysis: [Read analysis](https://atlas-staging.minestarters.com/news/rudyard-ollie-1-well-completion--0dc41c2a-5f2e-4f24-9e1d-729f2b8dda18) · [Markdown](https://atlas-staging.minestarters.com/news/rudyard-ollie-1-well-completion--0dc41c2a-5f2e-4f24-9e1d-729f2b8dda18.md)
- Original announcement: 2026-10-07T05:00:02.000Z
- Atlas analysis published: 2026-10-07T08:17:36.425Z
- Atlas analysis updated: 2026-10-07T08:17:36.425Z
- Company: Helix Exploration PLC (HEX)
- Original source: [lse](https://www.londonstockexchange.com/news-article/HEX/rudyard-ollie-1-well-completion/17823237)
- Atlas sentiment: 0.649
- Atlas tags: Nearology Play

Helix Exploration has completed the Ollie #1 well at the Rudyard project in Montana, reaching a total depth of 6,311 ft. The well yielded mudlog helium readings of 4,800 ppm, the highest recorded at Rudyard to date, and is intended to serve as a future production well.

## American Pacific Plans Downhole Surveys to Guide Step-Out Drilling at High-Grade Massive Sulfide Zone at Its Madison Copper-Gold Project in Montana

- Atlas analysis: [Read analysis](https://atlas-staging.minestarters.com/news/american-pacific-plans-downhole-surveys-to-guide-step-out-drilling-at-high-grade--302e2af3-2e72-4b81-9998-4d4f81b1eb98) · [Markdown](https://atlas-staging.minestarters.com/news/american-pacific-plans-downhole-surveys-to-guide-step-out-drilling-at-high-grade--302e2af3-2e72-4b81-9998-4d4f81b1eb98.md)
- Original announcement: 2026-10-06T11:00:00.000Z
- Atlas analysis published: 2026-10-06T11:17:38.812Z
- Atlas analysis updated: 2026-10-06T11:17:38.812Z
- Company: American Pacific Mining Corp. (USGD.CN)
- Original source: [orestocks](https://orestocks.com/company/USGD.CN/press-releases/7945601061582992)
- Atlas sentiment: 0.221
- Atlas tags: Stale Data Re-release

American Pacific Mining Corp. has engaged Colog, Inc. to conduct downhole geophysical and structural surveys in drill hole M26C-02 at the Madison Copper-Gold Project. The surveys aim to refine the geological model and guide planned step-out drilling to test the continuity and extensions of the high-grade massive sulfide zone.

## American Pacific Mining Plans Downhole Surveys to Guide Step-Out Drilling at High-Grade Massive Sulfide Zone at Its Madison Copper-Gold Project in Montana

- Atlas analysis: [Read analysis](https://atlas-staging.minestarters.com/news/american-pacific-mining-plans-downhole-surveys-to-guide-step-out-drilling-at-hig--fd4c35e1-1322-4738-b684-8d6d9b8f1518) · [Markdown](https://atlas-staging.minestarters.com/news/american-pacific-mining-plans-downhole-surveys-to-guide-step-out-drilling-at-hig--fd4c35e1-1322-4738-b684-8d6d9b8f1518.md)
- Original announcement: 2026-10-06T04:04:18.000Z
- Atlas analysis published: 2026-10-06T12:55:44.128Z
- Atlas analysis updated: 2026-10-06T12:55:44.128Z
- Company: American Pacific Mining Corp. (USGD)
- Original source: [jmn](https://www.juniorminingnetwork.com/junior-miner-news/press-releases/2553-cse/usgd/212365-american-pacific-plans-downhole-surveys-to-guide-step-out-drilling-at-high-grade-massive-sulfide-zone-at-its-madison-copper-gold-project-in-montana.html)
- Atlas sentiment: 0.162
- Atlas tags: Stale Data Re-release

American Pacific Mining is engaging Colog, Inc. to conduct downhole geophysical and structural surveys in drill hole M26C-02 at the Madison Copper-Gold Project. The survey results will be used to refine the geological model and guide planned step-out drilling to test the extension of the massive sulfide zone.

## OM1: Annual Report to Shareholders

- Atlas analysis: [Read analysis](https://atlas-staging.minestarters.com/news/om1-annual-report-to-shareholders--2575b782-75d9-4bed-a3dd-eef88769a1b9) · [Markdown](https://atlas-staging.minestarters.com/news/om1-annual-report-to-shareholders--2575b782-75d9-4bed-a3dd-eef88769a1b9.md)
- Original announcement: 2026-09-29T07:37:00.000Z
- Atlas analysis published: 2026-09-29T14:43:08.395Z
- Atlas analysis updated: 2026-09-29T14:43:08.395Z
- Company: Omnia Metals Group Ltd (OM1)
- Original source: [asx](https://www.asx.com.au/asx/v2/statistics/displayAnnouncement.do?display=pdf&idsId=03145526)
- Atlas sentiment: 0.152
- Atlas tags: Bonanza Intercept, Stale Data Re-release, No Significant Mineralization, Exploration Drilling, Deleterious Elements Present, Tenure Reduction, Capital Raise, Stale Estimate

Omnia Metals Group Ltd pivoted its strategy to focus on critical minerals in the US, acquiring the Stibnite Ridge Antimony and Silver Project and staking the Radix REE and Gallium Project in Montana, supported by $3.1 million in capital raises. Initial reconnaissance at Radix identified high-priority REE-Nb targets, while drilling at the Salt Creek Gold Project in Australia returned no significant mineralization. The company also entered a JV for the Corvette Project, which has historical high-grade gold intercepts, and continues to hold an earn-in interest in a Canadian lithium project.

# Atlas tag definitions

- **Bonanza Intercept:** Exceptionally high-grade zone, well above the deposit-type norm.
- **True Width Disclosed:** Actual thickness perpendicular to structure is stated, not just downhole length.
- **Step-Out Extension:** Mineralization extended beyond the previously known limit.
- **QA/QC Disclosed:** Release includes QA/QC disclosure — certified lab, QP sign-off, or stated methods (blanks, standards, duplicates).
- **Compositing Transparent:** Cut-off grade and internal dilution rules are clearly stated for reported intervals.
- **Refractory Ore:** Complex mineralogy requiring oxidation or other special processing before recovery.
- **Apparent Width Only:** Interval given as downhole width with no true width or drill orientation — apparent width may overstate true thickness.
- **Stale Data Re-release:** Historical results re-announced with no new assays or reinterpretation — low genuine novelty.
- **No QA/QC Disclosure:** Release does not disclose QA/QC — lab certification, CP/QP sign-off and assay protocols cannot be checked from this document.
- **Metal Equivalent Opaque:** Metal equivalent grade reported without disclosing the price, recovery, or payability assumptions used.
- **Cut-off Undisclosed:** Cut-off grade not disclosed — cannot assess comparability to prior estimates or peers.
- **Deleterious Elements Present:** Penalty elements (arsenic, antimony, etc.) or refractory concerns noted in the release.
- **Infill Drilling:** Confirmatory drilling to raise resource confidence, not new discovery.
- **Nearology Play:** Value premise rests on proximity to a known deposit rather than own results.
- **Measured Resource:** Highest confidence category — tonnage, grade, shape well-established from closely-spaced drilling. Basis for Proven Reserves.
- **Indicated Resource:** Reasonable geological confidence based on adequate drilling; continuity can be assumed. Basis for Probable Reserves.
- **Proven Reserve:** Measured Resource with demonstrated economic viability after applying modifying factors.
- **Probable Reserve:** Indicated Resource with demonstrated economic viability after applying modifying factors.
- **Category Upgrade:** Resource confidence improved — Inferred upgraded to Indicated, or Indicated to Measured. De-risking signal.
- **Tonnage Growth:** Significant tonnage increase (≥15%) vs prior estimate with grade maintained or improved.
- **Grade Improvement:** Average resource grade improved vs prior estimate — better deposit economics.
- **Contained Metal Growth:** True scale improvement — contained metal ounces/tonnes increased vs prior, accounting for both tonnage and grade changes.
- **QP/CP Signed:** 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.
- **Cut-off Disclosed:** Cut-off grade used for resource reporting is clearly stated, enabling like-for-like comparison.
- **JORC Compliant:** Resource estimate prepared in compliance with JORC Code (Australia) — high reporting standard.
- **NI 43-101 Compliant:** Resource estimate prepared in compliance with NI 43-101 (Canada) — high reporting standard.
- **Inferred Resource:** Speculative category — limited drilling, geological continuity assumed but not confirmed. Cannot support economic studies alone.
- **All Inferred:** 100% of resource is Inferred category — very early stage, no engineering confidence.
- **Grade Decline:** Average grade dropped >5% vs prior estimate — deposit economics worsening. May indicate high-grading in early drilling.
- **Tonnage Decline:** Resource tonnage decreased vs prior estimate — pit optimization removed marginal material or geological model revised down.
- **Category Downgrade:** Resource confidence decreased — Measured downgraded to Indicated, or Indicated to Inferred. Unusual and concerning.
- **Contained Metal Decline:** Contained metal decreased vs prior despite tonnage growth — grade dilution exceeds volume gain.
- **Dilutive Growth:** Tonnage increased but contained metal flat or down — likely from lower cut-off grade, not geological expansion.
- **Cut-off Lowered:** Cut-off grade significantly reduced vs prior estimate — tonnage growth may be artificial inflation.
- **Cut-off Undisclosed:** Cut-off grade not disclosed — cannot assess comparability to prior estimates or peers.
- **Historical Estimate Only:** Estimate pre-dates or does not comply with current JORC/NI 43-101 standards — requires verification drilling.
- **Stale Estimate:** Effective date is >2 years old — data currency concern, may not reflect current geological understanding.
- **No Contained Metal:** Tonnage and grade reported but contained metal not calculated or disclosed — incomplete reporting.
- **No QP/CP Disclosure:** No Qualified Person or Competent Person named — lower credibility for the estimate. A QP/CP should be a member of a recognized professional association with relevant experience.
- **Maiden Resource:** First formal MRE for the project — establishes baseline but typically exploration-stage with high Inferred component.
- **Resource Update:** Revised estimate for an existing resource — compare to prior to assess progress.
- **PEA-Supporting:** Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study.
- **PFS-Supporting:** Resource estimate prepared to support a Pre-Feasibility Study — requires adequate M&I component.
- **DFS-Supporting:** Resource estimate prepared to support a Definitive Feasibility Study — requires high M&I confidence.
- **High Recovery:** Recovery at or above the exceptional band for the commodity and processing route.
- **Pilot Scale Complete:** Pilot or demonstration plant testing completed under continuous operation.
- **Free Milling:** Simple, clean ore amenable to standard processing without oxidation.
- **Multi-Domain Tested:** Variability across ore domains (oxide, transition, fresh) has been addressed.
- **Recovery Improving:** Recovery improved versus a like-for-like prior test program on the same domain and route.
- **Low Recovery:** Recovery below the weak band for the commodity and processing route.
- **Bench Scale Only:** Only preliminary bench tests completed — no locked-cycle or pilot work.
- **Refractory Ore:** Complex mineralogy requiring oxidation or other special processing before recovery.
- **Single Domain Only:** Testing limited to one composite or domain — representativeness not established.
- **Recovery Stagnant:** No improvement across multiple test programs on comparable material.
- **Theoretical Recovery Only:** Only theoretical or liberation-derived recovery reported, with no actual test result.
- **Heap Leach Route:** Processing via heap leach — lower CAPEX and OPEX, lower recovery expected.
- **Mill Route:** Processing via mill or concentrator (CIL, CIP, tank leach, flotation).
- **Gravity Route:** Gravity separation forms a material part of the flowsheet.
- **POX/BIOX Route:** Pressure or bio-oxidation for refractory ore — high CAPEX and OPEX.
- **Byproduct Commodity:** The tested commodity is a byproduct rather than the primary economic driver.