Metallurgical testing work begins at Oaky Creek High Grade Antimony Prospect

Red Mountain Mining Limited (ASX: RMX, US CODE: RMXFF, or “Company”)a Critical Minerals exploration and development company with an established portfolio in Tier-1 Mining Districts in the United States and Australia, is pleased to announce the commencement of metallurgical testing work for the Oaky Creek antimony prospect within the 100% company-owned Armidale Antimony-Gold Project in the Southern New England Orogen in northeastern New South Wales.

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HIGHLIGHTS:

• Metallurgical testing has commenced at the Oaky Creek Antimony Prospect to accelerate progress at the 100% owned Red Mountain Armidale Antimony-Gold Project in New South Wales
• Detailed mineralogical characterization and an extensive crush, gravel and flotation study of a representative bulk sample of approximately 20 kg of quartz-stibnite vein material will be carried out to define the processing behavior and concentration potential of the ore, which is an important step towards commercial validation of the asset.
• Initiating metallurgical testing now, in parallel with ongoing exploration, is a deliberate accelerated strategy to demonstrate the viability of processing the Oaky Creek mineralization prior to planned drilling, significantly reducing risk to the asset and maximizing the value of each exploration milestone when achieved.
• The previously reported large coherent soil anomalies and rock sample results up to 39.3% Sb and 1.09 ppm Au for Oaky Creek indicate the presence of a large-scale orogenic antimony-gold vein system with a strike of approximately 3 km at the surface, which is analogous to Larvotto Resources’ Hillgrove project, Australia’s largest known antimony deposit.
• The expanded sampling program has just been completed and test results for the Oaky Creek program are expected to be received before the end of the first quarter of 2026
• Oaky Creek results expected to define multiple antimony and gold targets for drill testing in Q2 2026
• Test results from the recently acquired Thompson Falls Antimony Project in Montana, USA are pending and expected to be received before the end of March
• The US government recently launched a $12 billion strategic mineral stockpiling initiative aimed at securing critical mineral supply chains. Red Mountain’s Thompson Falls Antimony Project, located 2.6 miles from NYSE:UAMY operations, is well positioned in Antimony and Silver – both federally designated as Critical Minerals, consistent with U.S. supply chain priorities

With multiple samples from the prospect delivering high-quality results up to 39.3% SbRed Mountain has initiated a cost-effective program to generate a detailed mineralogical characterization and comprehensive crush, gravel and flotation study of a representative bulk sample of approximately 20 kg of quartz-carbonate-stibnite vein and breccia material (Figure 1) collected from multiple historic wells in Oaky Creek North (Figure 2). The work aims to define the processing behavior and concentration potential of the ore, which is an important step towards commercial validation of the asset.

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