Red Mountain Boosts Yellow Pine Project Size by 75% Near Multi-Million Ounce Gold Reserves

Strategic Expansion in a Tier-1 US Mining District

Red Mountain Mining Ltd (ASX – RMX) has announced a substantial expansion of its Yellow Pine Antimony Project in Idaho’s Stibnite Mining District, increasing the project size by 75% through the acquisition of additional mineral claims. This move follows a positive field mapping program that highlighted highly attractive geology and historical mining activity indicative of gold and antimony mineralisation.

The expanded project now covers 426 hectares, positioning Red Mountain’s footprint immediately northeast of its initial claims and less than 2 kilometres from Perpetua Resources’ Stibnite Gold-Antimony Project, which boasts proven and probable reserves of 4.8 million ounces of gold and 148 million pounds of antimony. This proximity places Red Mountain in a highly prospective corridor within a well-known US critical minerals hotspot.

Geological Prospects and Historical Context

Fieldwork by Red Mountain’s US-based technical team has confirmed the presence of tectonic breccias within quartzite associated with a major northeast-striking fault, a key structural feature controlling mineralisation in the district. The identification of hydrothermal fluid circulation along this fault is a positive indicator for economic mineral deposits. Additionally, the team located historical shallow pits targeting brecciated quartz veins, likely mined for gold and antimony in the early 20th century, underscoring the area’s mineral potential.

The Yellow Pine Project shares similar geological characteristics with both Perpetua’s Stibnite and Resolution Minerals’ Horse Heaven projects, including host rocks and structural controls conducive to gold-antimony mineralisation. Resolution Minerals recently reported impressive diamond drilling results at Horse Heaven, with broad intervals of gold mineralisation, further validating the district’s prospectivity.

Advancing Exploration and Strategic Positioning

Red Mountain plans to continue aggressive exploration at Yellow Pine, focusing on detailed mapping and sampling of the main fault and the contact zones between Idaho Batholith granites and surrounding metasedimentary rocks. The goal is to delineate high-quality drill targets by confirming signs of fluid movement, mineral alteration, and broken mineralised rock indicative of antimony and gold deposits.

Beyond Yellow Pine, Red Mountain is actively developing a portfolio of critical and strategic metals projects across Tier-1 US jurisdictions, including the Silver Dollar and Utah Antimony projects, as well as lithium assets in Nevada. The company recently listed on the US OTCQB market (RMXFF) to access capital and strategic partnerships aimed at fast-tracking project development and leveraging US government funding programs focused on critical minerals supply security.

Implications for the US Critical Minerals Supply Chain

With Western supply chains facing unprecedented shortages of strategic metals like antimony, Red Mountain’s expansion and exploration efforts align with strong US and Australian government interests in securing reliable sources of these critical commodities. The company’s growing presence in the Stibnite Mining District, alongside major players with significant reserves and recent capital injections, positions it well to contribute meaningfully to the US critical minerals landscape.