American Rare Earths (ASX:ARR) reported certified assay results from the first six of 18 HQ core holes drilled under its 2026 feasibility study program at the Cowboy State Mine within the Halleck Creek Rare Earths Project in Wyoming, according to a late Monday statement by the company.
The six holes returned broad, near-surface rare earth mineralization averaging 3,497 parts per million (ppm) total rare earth oxide (TREO), with a median of 3,879 ppm, while 93% of the 386 geological assay intervals exceeded the 1,000 ppm TREO resource cut-off.
The highest assay returned 9,084 ppm TREO over 3 meters in hole HC26-RM051, while HC26-RM056 intersected 191 meters of continuous mineralization.
Results from the remaining 12 holes are pending and will be incorporated into geological modeling and the ongoing feasibility study, the company said.