Red Mountain Targets 30-40% Antimony Concentrate from Oaky Creek Bulk Sample

Metallurgical Testing Underway at Oaky Creek

Red Mountain Mining Ltd (ASX – RMX) has taken a significant step forward in advancing its 100% owned Armidale Antimony-Gold Project in New South Wales by commencing metallurgical test work on a representative bulk sample from the Oaky Creek Antimony Prospect. The ~20kg sample, comprising quartz-carbonate-stibnite vein and breccia material, is undergoing detailed mineralogical characterisation alongside crush, grind, and flotation studies. These tests aim to define the ore's processing behaviour and the potential to produce a marketable antimony concentrate, a critical milestone towards commercial validation of the asset.

Strategic Acceleration to De-risk and Unlock Value

Red Mountain’s decision to initiate metallurgical testing in parallel with ongoing exploration reflects a deliberate strategy to accelerate project development. By demonstrating processing viability ahead of planned drilling, the company seeks to materially de-risk the asset and maximise the value of each exploration milestone. The testing is being conducted by Auralia Metallurgy, specialists in mineral processing, with the goal of producing a concentrate containing between 30% and 40% antimony, which would be commercially attractive if supported by sufficient tonnage.

Promising Exploration Results Support Potential

Oaky Creek has delivered compelling early results, with rock chip samples returning antimony grades as high as 39.3% Sb and gold up to 1.09ppm. Soil sampling has delineated a coherent 3km strike extent of orogenic antimony-gold mineralisation, analogous to Larvotto Resources’ Hillgrove Project, Australia’s largest known antimony deposit. A comprehensive soil and rock sampling program has recently concluded, with assay results expected before the end of the first quarter of 2026. These results are anticipated to define multiple high-priority drill targets for testing in the second quarter.

Project Context and Broader Strategic Importance

The Armidale Project sits within the Southern New England Orogen, a premier Australian antimony province characterised by structurally controlled quartz veins and breccias. Red Mountain’s portfolio also includes critical minerals projects in the United States, such as the Thompson Falls Antimony Project in Montana, which aligns with recent US government initiatives to secure critical mineral supply chains. This geographic and strategic diversification positions Red Mountain well to capitalise on growing demand for antimony, a critical mineral used in flame retardants, batteries, and other industrial applications.

Next Steps and Market Implications

With metallurgical testing underway and assay results imminent, Red Mountain is poised to refine its understanding of Oaky Creek’s resource potential and processing characteristics. Pending regulatory approvals, a ~2000m reverse circulation drilling program is planned to commence, supported by geophysical surveys to delineate mineralised zones. The company’s approach of parallel exploration and processing validation could accelerate timelines and enhance investor confidence as it advances towards commercialisation.