American Rare Earths’ northern summer mapping and sampling program has revealed potential for an even larger and higher-grade rare earths resource at the already significant Halleck Creek deposit in Wyoming.

The news comes as the northern autumn drilling program hits greater depths in the higher-grade Overton Mountain area and the company works towards an updated JORC Exploration Target.

American Rare Earths (ASX:ARR) had previously focused its attention on the Red Mountain and Overton claims, work which contributed to the Maiden JORC Resource of 1.43 billion tonnes, released in March. Within that is an estimated 4.73 million tonnes of Total Rare Earth Oxides (TREO) with about 24% of that high value magnet rare earth elements essential for the clean energy transition, modern communication and national security.

Now, thanks to the work done during the summer, ARR has identified future potential in the surrounding Bluegrass, Sommers Flat, Trail Creek and County Line areas of the deposit.

American Rare Earths (ASX:ARR)
Halleck Creek REE exploration areas, mapped areas and future map areas. Pic: ARR

Significantly, staff geologists were able to tightly constrain important boundaries and contacts between the rare earth element (REE) enriched material and surrounding rocks.

In addition, the summer initiative identified areas with more than 5,000ppm TREO.

CEO Donald Swartz commented: “Our summer initiative was successful, as the team has now confirmed the presence of rare earth mineralisation across a broader area, and at a higher grade, than had previously been known. While more work needs to be done to confirm the presence of these claims at depth and across the entirety of our land holdings, we are encouraged by these results as we continue to establish the Halleck Creek property as potentially the largest US mining play for rare earths.”

As part of the analysis 189 surface samples were analysed via XRF and 52 samples have been sent for confirmatory assay analysis of high-grade target mining areas.

Company geologists are currently moving ahead with optimising future drillhole locations, JORC exploration target(s), and placement of conceptual mine layout and facilities through GPS-confirmed geology.


Going deeper into Overton

It’s a busy time for ARR as the development drilling program in the Overton Mountain area continues on schedule with drills punching even deeper holes.

A core hole has been completed to 305m and exhibited REE mineralisation throughout, using XRF. Prior drilling in the area was limited to less than 175m and the deposit is still open at depth.

This week’s announcement closely follows that of last month’s high-grade assay results from the exciting new Beaver Creek Project, also in Wyoming, plus ARR boosting its land holding in that highly prospective area by 85%.



This article was developed in collaboration with American Rare Earths, a Stockhead advertiser at the time of publishing.


This article does not constitute financial product advice. You should consider obtaining independent advice before making any financial decisions.