Highlights

  • Olympio Metals has reported high-grade critical mineral results from historical waste dumps at its Raven project in Montana.
  • A regional review has highlighted the nearby Liver Peak porphyry system, raising the possibility of a deeper source.
  • The company is preparing field mapping and a drilling application ahead of a maiden drill program.

Critical minerals policy in the United States has sharpened attention on domestic sources of silver, antimony and tungsten, and ASX-listed explorers have been active in acquiring North American ground. Olympio Metals Limited (ASX:OLY), which explores for gold and critical minerals in North America and Australia, has added a new dimension to its Raven project in Montana, keeping the company in focus across ASX-listed Metal and Mining Stocks. The company reported high-grade results from reconnaissance sampling of historical mine waste and said it is assessing whether Raven's veins could be linked to a deeper porphyry system.

Raven's place in the Thompson River district

The Raven Silver Project lies in Sanders County, north-western Montana, near the town of Thompson Falls in the Thompson River mining district. It comprises lode claims covering the historical Raven mine, formerly known as Copper Mask, and the Silver King mine.

Olympio completed the Acquisition of the project in July. At the time, it noted that historical production was mainly silver, copper, lead and zinc, and that no modern exploration or drilling had been recorded at the site. Antimony and silver feature on the latest US Critical Minerals List, which the company has highlighted as relevant to the project. The company has also indicated that surface exploration and ground reconnaissance would be carried out with the support of a local exploration services group.

Results from historical waste dumps

The latest update covered a small set of reconnaissance grab samples collected from historical waste dumps at the Raven and Silver King mines. The company reported high-grade results for silver and antimony, together with copper, lead and zinc, and elevated indium and tungsten.

Olympio cautioned that the material was pre-sorted by historical mining. As a result, the samples do not establish in-situ grades, widths or continuity, and should be viewed as an indication of the metals present in the system rather than a measure of its size or quality.

The Liver Peak porphyry hypothesis

A regional geophysical review identified the Liver Peak porphyry system a short distance north-west of Raven. Historical reports associate Liver Peak with a magnetic high and a quartz-eye porphyry located along the regional structure that passes through Raven, while nearby regional gravity data shows a broad low.

Historical summaries describe drilling at Liver Peak in past exploration campaigns and an elliptical zone of strong alteration and quartz veining. The deeper porphyry target at Raven itself has never been drilled.

Managing director Sean Delaney said the historical records of the nearby porphyry add an encouraging new dimension to the company's targeting, and that Olympio is assessing whether Raven's veins could be linked to a deeper mineralised system. Porphyry systems can be large, but establishing such a link requires mapping, geophysics and ultimately drilling, and the hypothesis is yet to be tested.

In many mineral districts, high-grade silver and base metal veins form at the edges of larger intrusive systems, which is why explorers often look for a deeper porphyry source when vein-hosted mineralisation is found near altered intrusive rocks. Whether that model applies at Raven will depend on the results of mapping, geophysical interpretation and drill testing.

Next steps and wider portfolio

Planned work at Raven includes field mapping, preparation of a drilling application, and further review of the Liver Peak data and regional geophysics, as the company moves towards a maiden drill program. Permitting on US federal land and seasonal access in Montana's mountains are practical factors that could affect timing.

Olympio is also exploring the Jacknife silver project in Idaho, where it reported new priority drill targets in October. Together, the projects give the company exposure to several metals that US authorities have identified as strategically important.

Risks include the early-stage nature of the work, the limits of grab sampling from pre-sorted dumps and the uncertainty over whether a porphyry source exists beneath Raven.

Final Word: early signals to be tested

Olympio's update combines high-grade waste dump samples with a new porphyry concept at Raven, setting up a program of mapping and permitting ahead of maiden drilling. The results are indicative only and the porphyry link is unproven. For the Australian market, the update reflects the continued interest of ASX-listed explorers in US critical minerals projects as Supply security remains a policy priority in North America. Antimony in particular has attracted attention following export restrictions by major producing nations, prompting governments and end users to seek alternative sources.