Red Mountain Mining Expands Critical Minerals Portfolio with Utah Antimony Project

Red Mountain Mining (ASX: RMX) has expanded its US critical minerals portfolio, with the acquisition of 87 claims comprising the Utah antimony project through direct staking with the US Bureau of Land Management for a consideration of $138,000.

The Utah project lies immediately along strike to the north and south of Trigg Minerals’ (ASX: TMG) Antimony Canyon development, one of the largest and highest-grade projects of its kind in the US with a defined conceptual exploration target of between 12.8 million tonnes and 15.6Mt grading up to 1.5% for between 96,000t and 234,000t of antimony metal.

Red Mountain believes Utah has considerable potential for the discovery of similar mineralisation to that observed at Antimony Canyon.

Historical Antimony District

The Antimony Mining District was discovered in 1879 and produced high-grade ores from numerous mines until 1908, and then intermittently into the 1960s.

Antimony mineralisation within the district is related to a north-to-south trending system interpreted to be splays of the Paunsaugunt Fault, which acted as pathways for hydrothermal fluids sourced from nearby volcanic centres.

Antimony is typically found in discrete veins or stockwork zones, where dense networks of stibnite veins form within the host rocks that run parallel to the surrounding rock layers.

Channel sampling by Trigg at historical workings returned multiple assays exceeding 10% antimony, including a best result of 1.5m at 33.2% from the Stebenite mine at Antimony Canyon.

Initial Utah Exploration

Initial exploration at the Utah project will map the undercover extensions of north-to-south structures associated with antimony mineralisation near to the boundary of Antimony Canyon.

A desktop study is underway to assess available magnetic and topographic data that the company may augment with high-resolution drone magnetics and surface reconnaissance mapping to confirm the locations of sub-cropping structures.

Red Mountain will use this data to define areas for more intensive follow-up exploration and said it would likely need to conduct shallow trenching, along with auger and rotary blast drilling, to effectively test for antimony through the transported cover.