• 99.5% purity antimony trioxide successfully produced from Desert Antimony Mine feedstock
• Validates potential for 100% American-made, high-purity antimony products
• Supports Locksley's strategy to re-establish secure domestic supply chains for critical minerals

Locksley Resources Limited (ASX: LKY) has achieved a significant metallurgical milestone with the successful production of 99.5% purity antimony trioxide from feedstock sourced from the Desert Antimony Mine at the Mojave Project in California. This result, achieved through the Company's metallurgical optimisation program, demonstrates the potential to produce high-purity antimony products capable of supplying strategic Western defense and industrial supply chains. With antimony classified as a critical mineral and global supply heavily concentrated in China, this achievement represents an important step in Locksley's strategy to help re-establish secure, 100% American made, antimony production and refining capability. Locksley is one of the few antimony focused development projects in the United States capable of directly controlling mining, processing and product specification. The metallurgical optimisation program has targeted improving concentrate upgrading techniques, developing pyrometallurgical processes to produce refined antimony metal and compounds, and implementing impurity removal and purification strategies to target high purity products suitable for premium industrial and defense applications. Through iterative test campaigns, Locksley has successfully produced a 99.5% purity antimony trioxide sample, measured by X-ray diffraction (XRD) analysis. This high-purity antimony trioxide is a critical input for defense technologies, including munitions primers, military electronics and flame-retardant systems. The successful production of this material demonstrates the technical potential to generate high value antimony products from Locksley's feedstock, supporting the potential establishment of downstream refining capability aligned with Western critical mineral supply initiatives.

The next phase of metallurgical work will focus on ICP metallurgical testing to confirm impurity threshold and refine parameters for consistent high-purity antimony production, scaling metallurgical testing to larger batch sizes to evaluate process stability and reproducibility, evaluating engineering and economic parameters for potential pilot and commercial scale refining methods, and engaging strategic partners, metals traders and government supply chain participants for product qualification pathways.