American Tungsten & Antimony Ltd. (AT4) has produced antimony ingot at the Del Sol Hydromet Refinery in Nevada, marking a milestone in establishing a domestic mine-to-metal supply chain within the United States.
The antimony ingot was processed using ore mined from the White Spar antimony mine in Yavapai County, Arizona, and refined at the permitted Del Sol facility in Amargosa Valley, Nevada.
The production run was completed without requiring new processing infrastructure or additional environmental permitting, operating under a cooperative arrangement with Nexus Metals ahead of AT4’s proposed asset acquisition.
Antimony is classified as a vital mineral, serving as a primary feedstock for critical downstream applications, including defence-grade antimony trisulphide and sodium antimonate.
Physical product samples generated from the campaign will now undergo independent analytical testing to enable formal qualification processes with prospective commercial offtakers, defence contractors, and US government agencies.
While independent testing remains ongoing, AT4 has not disclosed specific grade, purity, or metallurgical recovery figures for the initial campaign.
“There is a clear difference between a company that intends to produce antimony in the United States and a company that has produced it,” said AT4 Executive Chairman Timothy Morrison.
“Qualification is the gate that every defense supply arrangement must pass through, and it cannot begin without physical material. We now have that material.”
AT4 CEO Casper Adson said the achievement validates the rationale behind the company’s proposed asset acquisition, demonstrating an integrated US platform that links domestic mining, refining, and downstream processing.
“We have taken material mined in Arizona, processed it through a permitted refinery in Nevada, and produced antimony ingot. This demonstrates a domestic mine-to-metal pathway for critical minerals on US soil.”
Looking ahead, AT4 plans to use the product samples to advance discussions regarding strategic funding opportunities, government grants, and long-term supply agreements with US defence primes, while continuing operational testing across the Del Sol refinery circuit.
