Red Mountain Mining Ltd (ASX: RMX) — Sampling Confirms Strong Tungsten Skarn Mineralisation at Pioneer Tungsten Project, Montana
1 July 2026
Price Sensitive Announcement $
Highlights:
- Analytical results for 30 rock chip samples from the Pioneer Tungsten Project in Montana have returned strongly anomalous tungsten values, with a third of samples containing over 500ppm tungstate (WO3)
- Maximum values of 3,159ppm (0.32%) WO3 from a garnet skarn float sample at the Greenstone claim area and 2,856ppm (0.29%) WO3 from a skarn outcrop within the Mammoth claims — comparable to the grade of Almonty’s adjacent Gentung Tungsten Deposit (6.83Mt @ 0.315% WO3)
- Five samples from the Greenstone area assayed above 1,000ppm (0.10%) WO3, with Greenstone identified as the highest priority prospect for further work
- Results confirm the presence of garnet skarn hosted tungsten mineralisation at surface within Red Mountain’s Pioneer Tungsten Project, with further systematic sampling planned to better define extent, variability and continuity prior to a drill decision
- Red Mountain’s claims lie adjacent to those purchased by Almonty Industries (Market Cap AU$6.7 billion) in November 2025, hosting the Gentung Tungsten Deposit and the historically productive Ivanhoe and Lost Creek Mines — which collectively produced an estimated 680kt of tungsten ore in the 1950s and 1970s
- Further systematic sampling at the Greenstone prospect is planned for mid-July, with the Company expecting to move rapidly to drill testing of down-dip extensions of skarn mineralisation subject to positive results
- Drilling at the Armidale Antimony-Gold Project in NSW will commence this month, with the drilling contractor now secured
Overview:
Red Mountain Mining has received analytical results from 30 rock chip samples collected across the Mammoth and Greenstone prospects at its 100% owned Pioneer Tungsten Project in Montana, confirming the presence of garnet skarn hosted tungsten mineralisation at surface and materially advancing the project toward drill-ready status.
Ten of the 30 samples returned results above 500ppm WO3, with five Greenstone area samples exceeding 1,000ppm and the top result reaching 3,159ppm (0.32%) WO3 from a garnet skarn float sample — a grade broadly comparable to the 0.315% WO3 of Almonty Industries’ Gentung Tungsten Deposit, which lies within just 200m of Red Mountain’s Mammoth claims. A single Mammoth sample also returned a strong 2,856ppm (0.29%) WO3 result from a skarn outcrop. Notably, six of the Greenstone area samples — including three above 500ppm WO3 — lie north of the Company’s current claim footprint, within an area RMX has staked and expects to have granted by the end of July 2026.
The Pioneer Tungsten Project covers three claim areas — Greenstone, Mammoth and Lost Creek — along the eastern margin of the Mount Torrey Batholith in southwest Montana, where the Uphill Creek Granodiorite contacts the Snowcrest Range Group limestone to generate scheelite-bearing massive garnet skarns up to 25m thick. In addition to the confirmed surface expressions of skarn mineralisation, previous magnetic modelling by Arrow Geosciences has identified subsurface magnetic bodies interpreted to represent the granodiorite source of the skarn at drillable depths beneath overlying quartzite units at both Mammoth and Greenstone — providing a compelling structural case for testing down-dip extensions.
With the current results validating the surface case for tungsten mineralisation across Red Mountain’s claim areas, the Company will now focus systematic follow-up sampling on the Greenstone prospect in mid-July ahead of a rapid move to drill testing, subject to continued positive results. In parallel, Red Mountain’s drilling contractor has been secured for the Armidale Antimony-Gold Project in NSW, with RC drilling set to commence this month.
About Red Mountain Mining Ltd (ASX: RMX):
Red Mountain Mining Limited is a Critical Minerals exploration and development company with an established portfolio in Tier-1 Mining Districts in the United States and Australia. In the United States, the Company holds the 100% owned Pioneer Tungsten Project in Montana, comprising the Greenstone, Mammoth and Lost Creek prospects along the eastern margin of the Mount Torrey Batholith — a historically productive tungsten district immediately adjacent to Almonty Industries’ Gentung Tungsten Deposit. In Australia, Red Mountain’s flagship Armidale Antimony-Gold Project spans an 85km corridor in the Southern New England Orogen of New South Wales, sitting in close proximity to Larvotto Resources’ Hillgrove deposit — Australia’s largest known antimony deposit. RC drilling at Armidale is set to commence this month.
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