Red Mountain Mining Returns 0.55% Tungsten With Copper and Gold

Red Mountain Mining (ASX: RMX) has returned tungsten grades of up to 0.55% WO₃ from surface rock chips at its Pioneer Project in Montana, with copper values reaching 6.72% and silver hitting 462 g/t in the same zones. That combination is the early signal that this is not a single-commodity story.

The September 2026 results expand significantly on the July dataset. Across three prospects, Greenstone, Glow Worm, and Lost Creek, 50 samples now exceed 500 ppm WO₃ and 31 surpass 1,000 ppm WO₃. The update lands as tungsten prices have surged more than fourfold since January 2026, driven by Chinese export controls that have structurally tightened Western supply.

What follows here matters for anyone tracking RMX: what these grades tell you about Pioneer’s prospectivity, what the polymetallic signatures add to the investment case, and what has to happen before any drilling decision is confirmed.

What the expanded rock chip program found across Pioneer’s three prospects

Greenstone is the headline. Of 113 rock, float, and spoil samples collected, 30 exceeded 500 ppm WO₃ and 17 surpassed 1,000 ppm WO₃, with a peak of 5,473 ppm, equal to 0.55% WO₃.

The strength is not just in the numbers but in the geometry. Peak mineralisation concentrates within a zone roughly 400 metres in strike length, sitting south-southwest of the historical Greenstone Mine Claim and lining up with mapped garnet skarn.

Then the northern sections added a second dimension.

Greenstone polymetallic peaks Copper up to 6.72%, silver up to 462 g/t, and gold reaching 3.88 g/t. Tungsten was the target. These are what a broader mineralised system looks like.

Glow Worm is the September newcomer, absent from the July reporting. Of 57 samples, 12 exceeded 500 ppm WO₃ and eight surpassed 1,000 ppm WO₃, peaking at 4,036 ppm (0.40% WO₃).

Its history explains the copper. Glow Worm was an early 20th-century copper exploration target, hosting at least six adits and four shallow shafts along roughly 700 metres of mapped garnet skarn. The recent assays, copper up to 3.97% and silver up to 199 g/t, validate what the old workings were chasing.

Lost Creek rounds out the picture. Its peak tungsten result reached 3,241 ppm (0.32% WO₃), and the ground sits over historical mine workings consistent with the same geological model.

The historical Lost Creek Mine produced approximately 19,000 tonnes of ore at an average grade of 0.18% WO₃ between 1952 and 1956, a modest record, but one that confirms the skarn here has already delivered tungsten before.

The convergence of high tungsten grades with copper, silver, and gold across three spatially distinct prospects tells you something the July results could not. Pioneer may be a polymetallic skarn system rather than a narrow tungsten play, and that changes the risk and reward profile materially.

The July baseline results established Greenstone as the lead prospect, with a peak of 3,159 ppm WO3 at that stage; the September program has since expanded the sample count and introduced Glow Worm as a second active skarn zone.

Why a skarn system in Montana carries structural weight beyond the assay numbers

To understand why these grades matter, start with how the deposit forms. A skarn develops where a granite intrusion pushes into limestone, and the hot fluids it expels react with the carbonate rock to build garnet-rich calc-silicate zones. Those zones host scheelite, the calcium tungstate mineral that carries the tungsten.

Pioneer sits on the eastern margin of the Cretaceous Mount Torrey Batholith, exactly the setting that model predicts. It also sits directly adjacent to Almonty Industries’ Gentung deposit, which hosts 6.83 Mt at 0.315% WO₃.

That adjacency is the point. Pioneer’s surface grades of 0.32% to 0.55% WO₃ are already in the same range as the established deposit next door.

According to grade-tonnage models for tungsten skarns in the western US, typical grades run 0.4% to 2% WO₃, often averaging around 0.7%. Pioneer’s peak surface samples land squarely inside that neighbourhood benchmark, which tells you the results are consistent with a proven deposit style rather than isolated anomalies.

The policy and price backdrop that makes Montana relevant right now

The timing is doing RMX a favour. Ammonium paratungstate, the traded tungsten benchmark, surged from roughly US$83/kg WO₃ in January 2026 to about US$340/kg WO₃ by July 2026, a more than fourfold rise.

The proximate cause is China, which produced about 79-80% of global mine output in 2025 and controls roughly 85% of refining capacity. Its February 2025 export controls and the listing of tungsten in the 2026 Catalogue of Dual-Use Items sharply constrained overseas supply.

The US policy response has been formal and fast:

• Tungsten is one of 60 minerals named on the final 2025 US Critical Minerals List, published by the Department of the Interior.
• From 1 January 2027, US defence procurement rules will prohibit many tungsten materials sourced from China, Russia, North Korea, or Iran.
• The US Department of Defense redirected US$6.2 million toward domestic tungsten extraction initiatives in Nevada, part of a broader strategy to secure US supply.

Tungsten’s inclusion on the US Critical Minerals List, which names 60 strategic resources, was formalised by the Department of the Interior in 2025 and sits at the centre of the policy architecture now shaping western exploration funding and defence procurement timelines.

For an investor, this means Pioneer’s exploration upside is arriving at a structurally advantageous moment: the right geological address, grades matching the neighbourhood, and a commodity under active US strategic protection.

What comes next for Pioneer, and what investors should watch for

The forward path is specific and conditional, not promotional. Greenstone is the confirmed near-term drilling priority, where RMX intends to drill-test downdip extensions of the skarn. That comes only after further geological mapping and field evaluation.

Glow Worm and Lost Creek still hold unmapped skarn zones. The expanded mapping program will extend into ground not previously covered by historical skarn mapping, which represents open exploration upside beyond what the rock chips have already shown.

The near-term sequence looks like this:

1. Extended geological mapping at Greenstone and Lost Creek, reaching into historically unmapped zones.
2. Identification of coherent drill targets from new and historical skarn mapping.
3. Field evaluation ahead of a drilling program commencing at Greenstone.

A calibrated caveat is warranted here. Rock chip samples are selective and surface-only. They target visible mineralisation, can be biased high, and do not establish subsurface continuity. They cannot support a resource estimate under JORC, the reporting code that classifies mineral resources by confidence level.

JORC resource classification is the reporting standard that governs how ASX-listed miners publicly disclose mineral resources; without a compliant estimate, the grades Pioneer has returned remain surface observations rather than a defined asset on any company balance sheet.

RMX has not yet defined a JORC resource at Pioneer, and in May 2026 it retracted historical exploration results at the site because they could not yet be verified to JORC standards. That verification remains outstanding.

Ownership, at least, is settled. RMX exercised an option in May 2026 to secure 100% of the 209-hectare project, subject to a 2% net smelter royalty retained by the vendor.

The timeline reality The Essential Minerals Association notes it takes 7 to 10 years on average to secure federal permits to open a mine in the US. Pioneer is at surface-sampling stage, well before that clock starts in earnest.

The milestone that matters next is not the grades already in hand. It is whether the mapping identifies drill targets coherent enough to justify a maiden program, and on what timeline RMX can fund and permit that step.

Pioneer’s place in a thickening field of ASX tungsten plays

RMX is not alone in chasing western US tungsten, and context helps you judge where Pioneer sits on the maturity spectrum.

Pioneer Minerals (ASX: PMM) has pivoted to tungsten at its North Pine Project in Idaho, another reduced polymetallic skarn, with sampling returning grades up to 2.98% WO₃. Viking Mines (ASX: VKA) is acquiring six Nevada tungsten projects with historical production of roughly 123,000 tonnes at 0.54% grades, leaning on existing ground disturbance to fast-track permitting.

ASX tungsten brownfield acquisitions in the western US accelerated through 2026 as the price surge prompted juniors to target projects with historical production records, a strategy that trades exploration risk for permitting complexity on ground already disturbed by past mining activity.

Further along the curve, American West Metals (ASX: AW1) operates the West Desert polymetallic skarn in Utah, with over 59 Mt of indicated and inferred resources, yet still in scoping phase. It illustrates how long the development path runs even for advanced polymetallic skarns.

Pioneer’s surface grades are competitive within this ASX cohort. But grade leadership at rock chip stage is a weak differentiator. The next filter is which projects convert surface anomalies into drillable targets, and then into JORC resources.

What the Pioneer update actually changes for investors assessing RMX

Strip away the grade headlines and ask what genuinely moved since July. Three things did.

What has changed since July:

• Glow Worm has been added as a third active prospect, alongside Greenstone and Lost Creek.
• The sample count above 500 ppm WO₃ rose from 10 in the July baseline to 50 in September, with 31 now above 1,000 ppm.
• Polymetallic signatures, copper, silver, and gold, have been confirmed across multiple zones, up from a peak of 3,159 ppm WO₃ at Greenstone in July.

What remains unresolved:

• No JORC resource has been defined at Pioneer, and historical results retracted in May 2026 await verification.
• No drilling program has been announced.
• No binding offtake or strategic partner has been named.

Ownership is the one hard fact locked in, with RMX holding 100% of the 209-hectare project after its May option exercise.

The September update confirms Pioneer has surface breadth across multiple prospects. But the step that would move the thesis from interesting anomaly to fundable target is a drill program, and that step is still conditional on mapping and field evaluation outcomes.

From rock chips to drill collars: the path Pioneer needs to walk

Understanding the road ahead is what separates a well-informed view of RMX from a momentum-driven one. The progression from surface sampling to a maiden drilling program is a multi-step sequence, and each step demands its own technical work, funding, and regulatory clearance.

The full path runs roughly like this:

1. Mapping and drill target definition at Greenstone and Lost Creek.
2. Permitting applications through federal, state, and local approvals.
3. A maiden drilling program.
4. Resource definition under JORC.
5. Feasibility and financing.

The western US permitting environment is a material timeline risk. Federal approvals average 7 to 10 years, and from discovery to production, large mining projects can take 16 to 30 years. At pre-resource stage, that is a horizon consideration rather than a dealbreaker, but it frames Pioneer as long-duration optionality, not a near-term production story. The retained 2% net smelter royalty is a further structural factor for any eventual production economics.

The variable that could shorten that curve is the polymetallic potential. If drilling confirms a genuine copper-silver-gold-tungsten system, Pioneer would stand apart from a pure tungsten play and could attract a wider set of strategic interest than its exploration stage would otherwise warrant.

This article is for informational purposes only and should not be considered financial advice. Investors should conduct their own research and consult with financial professionals before making investment decisions. Past performance does not guarantee future results, and forward-looking statements are speculative and subject to change based on market and company developments.