Which Small-Cap ASX Mining Share Reported ‘Highly Prospective’ Tungsten Results?

Key Points

• Red Mountain Mining (ASX:RMX), a small-cap ASX mining share still in the exploration stage, has reported widespread elevated tungsten from its latest sampling at the Pioneer Project in Montana, with results spread across Greenstone, Glow Worm and Lost Creek.

• Of 50 rock samples returning more than 500ppm WO₃, 31 exceeded 1,000ppm, including a best result of 5,473ppm, or 0.55% WO₃, at Greenstone.

• The Simply Wall St community narrative values Red Mountain at AU$0.022 per share versus a share price of AU$0.012, suggesting the shares are 44.4% undervalued, although the valuation remains highly speculative.

Latest samples for this small-cap ASX mining share

Red Mountain Mining has reported a strong set of tungsten assays from its Pioneer Tungsten Project in Montana, with the latest sampling providing further evidence of mineralisation across three separate prospects.

The headline numbers are notable not just for their peak grades, but for their consistency. Fifty rock samples returned more than 500 parts per million tungsten oxide (WO₃), while 31 exceeded 1,000ppm.

The strongest result came from Greenstone, where a sample returned 5,473ppm, equivalent to 0.55% WO₃. Glow Worm produced a peak result of 4,036ppm, or 0.40% WO₃, while Lost Creek returned up to 3,241ppm, or 0.32% WO₃.

The results are spread across Greenstone, Glow Worm and Lost Creek, which together form part of a roughly 5km trend along the eastern margin of the Mount Torrey Batholith.

This distribution is important because it suggests the exploration opportunity is not limited to a single isolated high-grade sample. However, the results are based on surface sampling and do not yet establish the continuity, thickness or scale of the mineralisation at depth.

Greenstone provides the clearest drilling opportunity

The distribution of the assays becomes particularly interesting when considered alongside the project’s geology.

At Greenstone, 30 of 113 rock, float and spoil samples returned more than 500ppm WO₃, with 17 above 1,000ppm. The strongest tungsten zone extends along approximately 400m of strike south-southwest of the Greenstone Mine Claim and is associated with mapped garnet skarn.

Red Mountain considers this area a priority drill target. 

Glow Worm also produced encouraging results. Twelve of 57 rock, float and spoil samples exceeded 500ppm WO₃, with eight above 1,000ppm. Soil sampling at Glow Worm also returned elevated tungsten, with seven of 23 samples above 50ppm and a maximum of 383ppm.

Lost Creek adds another layer of interest. Eight of just 13 samples returned more than 500ppm WO₃, while six exceeded 1,000ppm. The prospect also has a history of tungsten production, with 19,000 tonnes produced at an historical grade of 0.18% WO₃ between 1952 and 1956.

Much of Lost Creek remains unsampled, meaning further work could help determine whether the latest results extend beyond the currently identified areas.

What the latest assays mean for investors

The latest results strengthen the geological case for further exploration at Pioneer for this small-cap ASX mining share, particularly because elevated tungsten has now been identified across several prospects.

The project has also expanded to 517 hectares, more than doubling its original footprint, with Mammoth added and Glow Worm newly pegged and granted. Mammoth has previously returned up to 2,856ppm, or 0.29% WO₃, although much of the area remains unexplored.

The main issue for investors is that Red Mountain has not yet established a mineral resource at Pioneer.

Surface sampling can identify prospective areas, but drilling will need to establish whether the tungsten continues at depth, how thick the mineralised zones are and whether grades remain consistent.

That makes the next phase of exploration particularly important. Further mapping and sampling should help prioritise targets before drilling, with southern Greenstone and northern Lost Creek among the areas the company has identified for attention.

The results arrive at a time when tungsten is receiving greater attention as a critical mineral, while Pioneer is also located near other tungsten projects and historical workings.

Most followed narrative

The most followed Simply Wall St community narrative places a fair value of AU$0.022 per Red Mountain share, compared with a share price of AU$0.012, implying the shares are approximately 44.4% undervalued against that estimate.

The narrative focuses on the ASX mining share’s exposure to two critical metals, antimony and tungsten, and argues that the company’s exploration ground could be worth more than the market currently recognises.

As the narrative puts it, “The bet underneath all of it is a simple one: that proximity to proven deposits raises the odds RMX is standing on something similar.”

The latest Pioneer assays provide some support for that thesis. Multiple prospects have now returned elevated tungsten, while Greenstone has produced a defined zone of approximately 400m of strike that Red Mountain considers a priority drill target.

At the same time, the update highlights the speculative nature of the valuation. Strong surface assays are encouraging, but they do not yet establish a resource or demonstrate economic viability. Drilling will need to test whether the mineralisation continues at depth and has sufficient scale and continuity.

The community narrative also highlights risks including the absence of a resource estimate and the potential for future dilution.

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Simply Wall St analyst Andrew Legget and Simply Wall St have no position in any of the companies mentioned. This article is general in nature. We provide commentary based on historical data and analyst forecasts only using an unbiased methodology and our articles are not intended to be financial advice. It does not constitute a recommendation to buy or sell any stock and does not take account of your objectives, or your financial situation. We aim to bring you long-term focused analysis driven by fundamental data. Note that our analysis may not factor in the latest price-sensitive company announcements or qualitative material.