Locksley Resources (ASX:LKY | OTCQX:LKYRF | ADR:LKYLY) advances U.S. antimony pathway with domestic metal production milestone

Locksley Resources has progressed its U.S. antimony strategy with the successful production of metallic antimony from material sourced at its Mojave Project in California, marking a key step in the company’s metallurgical optimisation program focused on the Desert Antimony Mine prospect.

The update follows technical and commercial meetings in the United States with delivery partners, alongside ongoing laboratory work with Hazen Research Inc., which was engaged in 2025 to support Locksley’s integrated mine-to-market antimony strategy.

Highlights

• Technical and commercial meetings completed in the United States with key delivery partners.

• Hazen Research Inc. successfully produced antimony ingots from Mojave Project material, demonstrating a domestic mine-to-metal pathway.

• Memorandum of Understanding signed with Hazen to assess toll processing of available high-grade stibnite from the Desert Antimony Mine.

• Metallurgical optimisation program progressing to confirm process flowsheet and capacity to produce defence-grade antimony products.

• Test work delivered metallic antimony exceeding 99% purity via XRD and Rietveld refinement analysis.

• Next phase targets production and qualification of Antimony Trioxide and Antimony Trisulphide.

• Program supports development of a secure U.S. sovereign supply chain for critical minerals.

The metallurgical program commenced in late 2025 and has advanced through multiple bench-scale campaigns using Desert Antimony Mine material.

Analytical results confirmed production of metallic antimony exceeding 99% purity, trending toward defence-grade specifications, reinforcing confidence in the selected processing route and supporting evaluation of near-term toll-processing and pilot-scale refining solutions while longer-term development options continue to be assessed.

In parallel, Locksley has executed an MOU with Hazen to evaluate toll processing of high-grade stibnite from the Desert Antimony Mine, providing a potential low-capital pathway toward early production while broader development studies progress.

Engagement with delivery partners is continuing as Locksley works to establish a fully integrated supply chain within the United States, with current efforts focused on accelerating pilot-scale processing pathways in alignment with U.S. Government critical minerals initiatives.

Chief Operating Officer Danny George said the collaboration was delivering tangible outcomes, noting that

“the collaboration with Hazen is delivering key technical validations through targeted test work and process refinements. These results are building a foundation for toll processing assessments and potential early commercial opportunities in the U.S., aligning with our goal of a secure domestic antimony supply.”

Strategically, antimony is classified as a critical mineral by the United States Government due to its essential role in defence, energy storage, advanced alloys and flame-retardant technologies.

With global supply heavily reliant on non-U.S. sources, Locksley’s progress directly addresses supply chain risk while supporting national security priorities.

The company considers its collaboration with Hazen as positioning it at the forefront of efforts to re-establish American antimony capability, while also enabling near-term toll processing opportunities alongside broader development work.

Managing Director and CEO Kerrie Matthews highlighted the integrated nature of the program, stating that the advancement of metallurgical testing alongside exploration activity strengthens the company’s development pathway at Mojave and reinforces its commitment to progressing the project.

The next stage of work will focus on manufacturing and qualifying Antimony Trioxide, used in flame retardants, electronics, plastics and energy applications, and Antimony Trisulphide, a strategic material utilised in primers, defence systems and specialty chemicals.

Product samples will be prepared for engagement with prospective U.S. offtake and qualification partners, with recognised product standards forming a necessary step toward longer-term supply agreements and integration into defence and industrial supply chains.

As these activities continue, Locksley says it will update the market as further technical results, product qualifications and commercial discussions advance, underscoring its broader objective of building a vertically integrated mine-to-market antimony supply chain within the United States.

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