Red Mountain Mining Ltd
- ASX Code: RMX
- Market Cap: $10,441,317
- Shares On Issue (SOI): 1,044,131,729
Red Mountain Mining Advances Pioneer Tungsten Project Toward Drill Testing as Field Crews Hit the Ground in Montana
Red Mountain Mining (ASX: RMX) has commenced systematic rock chip sampling at its 100% owned Pioneer Tungsten Project in Montana, USA, marking a significant step toward defining drill targets across a tungsten skarn corridor the company describes as highly prospective. Field crews are on the ground now, with assay results expected by the end of August. Alongside this, the company is preparing for Red Mountain Mining Pioneer Tungsten Project drill testing at its Armidale Antimony-Gold Project in New South Wales, scheduled to begin in the first week of August.
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What's Happening at Pioneer and Why Does It Matter Now?
The current field program is focused on two of the three claim areas that make up the Pioneer Tungsten Project: the Greenstone and Lost Creek claims. The third area, Mammoth, will receive further geological mapping and follow-up sampling during the current quarter.
This round of systematic sampling builds on Red Mountain's initial reconnaissance program, results from which were reported on 1 July 2026. That earlier work returned the following values:
| Claim Area | Best Result (ppm WO₃) | Best Result (% WO₃) |
|---|---|---|
| Greenstone | 3,159 ppm | 0.32% |
| Mammoth | 2,856 ppm | 0.29% |
| Lost Creek | Not sampled (time constraints) | Not applicable |
According to the company, these figures are comparable to the grade of Almonty Industries' Gentung Tungsten Deposit, which sits within 200 metres of Red Mountain's Mammoth claims and carries a total mineral resource of 6.83 million tonnes (Mt) at 0.315% WO₃.
Almonty Industries (NASDAQ: ALM), which purchased the Gentung deposit in November 2025, currently carries a market capitalisation of approximately $6.7 billion, based on the announcement. The proximity of Red Mountain's claims to a large peer's flagship asset, combined with reported grades from initial surface sampling, provides important geological context guiding the next phase of exploration.
Understanding Garnet Skarn Tungsten Mineralisation
Appreciating why the company is progressing toward drill testing requires some background on the type of mineral deposit being explored at Pioneer.
What Is a Garnet Skarn?
A skarn forms when hot, mineral-rich fluids from an igneous intrusion — in this case the Cretaceous Uphill Creek Granodiorite — react with surrounding carbonate rocks such as limestone. This process, known as metasomatism, chemically alters the limestone and deposits new minerals, including tungsten in the form of scheelite (calcium tungstate), along with garnet and pyroxene.
At Pioneer, the key geological relationship is the contact zone between the Uphill Creek Granodiorite and the Snowcrest Range Group limestone. Where these two rock types meet, conditions are considered favourable for garnet skarn, and potentially tungsten, to form. According to United States Geological Survey (USGS) mapping referenced in the announcement, this contact is present throughout the strike length of Red Mountain's Greenstone and Lost Creek claims.
Why Does This Matter to Investors?
Skarn deposits are generally considered to be geologically predictable and spatially well-defined compared with some other mineralisation styles. Where mineralisation is confirmed at surface, it can continue at depth along the contact plane, which may simplify drill targeting once surface sampling establishes grade and geometry.
Furthermore, Red Mountain has stated that the "relatively simple and well-understood geology" of Pioneer supports its expectation of moving toward drill testing of down-dip extensions, subject to positive assay results.
Quick Glossary
- Scheelite (CaWO₄): The primary tungsten ore mineral identified at Pioneer, a calcium tungstate compound
- WO₃ (tungsten trioxide): The standard unit used to express tungsten grade
- ppm (parts per million): A measure of concentration; 3,159 ppm WO₃ is equivalent to 0.32% WO₃
- Down-dip extension: The continuation of a mineralised zone at depth, following the angle of the geological contact
- Skarn: A rock type formed by the reaction of igneous fluids with carbonate rocks, which can host economic mineralisation
- Batholith: A large, deep-rooted body of igneous rock formed from solidified magma beneath the Earth's surface
How the Sampling Program Is Being Conducted
The systematic sampling at Greenstone and Lost Creek is designed to establish where tungsten mineralisation is strong enough, continuous enough, and geometrically suited to down-dip drill testing.
According to the announcement, the methodology includes:
- East-west sampling traverses across mapped garnet skarn mineralisation at a nominal 50-metre spacing
- Representative channel samples collected across 5 metres of outcrop where continuous exposure allows
- Individual rock chip grab samples collected where outcrop is not near-continuous
- Reconnaissance mapping and rock chip sampling beyond previously mapped skarn areas at both Greenstone and Lost Creek, to identify targets for follow-up during the current northern hemisphere field season
At Greenstone, the program also extends into an area north of the current claim footprint that Red Mountain has staked and expects to be granted by the end of July 2026. At Lost Creek, USGS mapping shows Snowcrest Range limestone in direct contact with the granodiorite throughout the claim area at surface, which the company says implies potential for additional skarn development that has not yet been sampled.
A District With a Documented Production History
The Pioneer district has recorded tungsten production dating back to the 1950s, when activity was driven initially by US Federal Government strategic metal stockpiling programmes.
| Mine | Period of Production | Tonnage | Average Grade |
|---|---|---|---|
| Ivanhoe Mine | 1953–1957 (initial period) | 567,000 tonnes | 0.35% WO₃ |
| Lost Creek Mine | 1952–1956 | 19,000 tonnes | 0.18% WO₃ |
| Greenstone Mine | 1950s | 900 kg sorted ore | 1.2% WO₃ |
| Ivanhoe Mine (restart) | 1971–1975 | Part of approximately 680,000 tonnes total | Not specified |
Total estimated district production from the 1950s and 1970s is approximately 680,000 tonnes of tungsten ore, according to the announcement. Red Mountain's claims cover the same skarn belt that hosted this historical production, with outcropping garnet skarn mapped within both the Greenstone and Lost Creek claim areas.
The announcement notes that the prospective Snowcrest Range Group extends beyond the areas mapped by Pattee (1960) throughout the full strike length of Red Mountain's claims, suggesting the potential for mineralisation over an area larger than that worked by historical operators.
Two-Fronted Exploration as Armidale Drill Testing Approaches
While Pioneer progresses in Montana, Red Mountain is also preparing for maiden drill testing at its Armidale Antimony-Gold Project in northeast New South Wales. According to the announcement, the programme will comprise:
- Up to 32 reverse circulation (RC) drillholes to a maximum depth of 300 metres
- Multiple priority targets at the Oaky Creek antimony prospect
- Access tracks already in place and initial drill sites prepared
- Drilling contractor confirmation of commencement in the first week of August 2026, following a delay caused by wet weather affecting the rig's prior assignment
The Armidale Project has previously returned antimony rock chip samples of up to 39.3% Sb, providing a strong surface indication ahead of the upcoming drill programme. This concurrent activity across two projects means Red Mountain is approaching a period of exploration newsflow spanning tungsten in the US and antimony-gold in Australia within a compressed timeframe.
Upcoming Catalysts and Timeline
| Milestone | Expected Timing |
|---|---|
| Systematic rock chip sampling at Greenstone and Lost Creek | Currently underway (as of 29 July 2026) |
| New claim area granted at Greenstone (north extension) | End of July 2026 |
| Mammoth further mapping and follow-up sampling | Current quarter |
| Assay results from Greenstone and Lost Creek systematic sampling | End of August 2026 |
| Armidale RC drilling commences at Oaky Creek | First week of August 2026 |
| Drill target definition at Pioneer | Subject to positive assay results |
The Investment Case
Red Mountain's approach at Pioneer follows a defined sequence: surface sampling to establish grade and geometry, followed by proposed drill testing of down-dip extensions, subject to assay outcomes. Several elements of the investment case are consequently worth noting.
Comparable Grades to a Larger Neighbour
Initial sampling at Greenstone and Mammoth returned grades the company describes as comparable to Almonty Industries' 6.83 Mt Gentung resource, situated immediately adjacent within the same skarn belt and geological setting.
100% Ownership With a Defined Pathway to Drilling
Red Mountain holds the Pioneer claims outright via an option agreement under which it has assumed full ownership. With outcropping skarn confirmed at surface, the company has outlined a clear path toward the Red Mountain Mining Pioneer Tungsten Project drill testing phase, contingent on assay results due by the end of August.
Untested Strike Length
USGS mapping cited in the announcement indicates the prospective Snowcrest Range Group extends throughout the full strike length of the Greenstone and Lost Creek claims, beyond the areas mapped in the 1950s. The current sampling, however, represents the first modern systematic assessment of this extended footprint.
Dual-Jurisdiction, Dual-Commodity Newsflow
With Armidale drilling due to begin and Pioneer assays anticipated in August, Red Mountain is approaching a concentrated period of exploration results spanning antimony-gold in Australia and tungsten in the United States.
Magnetic Modelling Supporting Subsurface Targeting
Magnetic modelling completed by Arrow Geosciences has identified shallow subsurface magnetic bodies interpreted to represent the granodiorite source of skarn mineralisation beneath overlying quartzite in the southern part of the Greenstone area, providing an additional exploration vector beyond surface outcrop alone.
Key takeaway
"Red Mountain Mining has positioned itself at the intersection of two critical minerals — tungsten and antimony — with active exploration programmes in mining jurisdictions across the US and Australia. With systematic sampling underway at Pioneer and results due by the end of August, followed by potential drill target definition, and maiden RC drilling at Armidale set for the first week of August, the company is entering one of its more catalytic periods to date."
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Why Investors Should Watch Red Mountain Mining
Red Mountain is executing a systematic exploration programme across a project situated adjacent to a larger operator's resource, within a district that has a documented production history, and with surface sampling results the company says already align with grades reported at its neighbour's defined resource.
In addition, the company describes itself as being in the final stages of pre-drill target definition, with Red Mountain Mining Pioneer Tungsten Project drill testing anticipated to follow once assay results — expected within weeks — are assessed. Concurrently, the Armidale antimony-gold programme is moving into maiden drilling, creating a window of activity across both projects that investors focused on critical minerals exploration may wish to monitor closely.
Ready to Follow Red Mountain Mining's Next Exploration Milestones?
With systematic sampling underway at the Pioneer Tungsten Project in Montana, assay results expected by end of August, and maiden RC drilling at the Armidale Antimony-Gold Project commencing in the first week of August, Red Mountain Mining (ASX: RMX) is entering one of its most active exploration periods to date. Investors seeking to stay across upcoming results and developments across both projects can access the latest updates, announcements, and company information directly at Red Mountain Mining's Investor Hub.
