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United States Antimony Corp
United States Antimony Corp is the only domestic US antimony producer, operating mines in Montana and Idaho for defense and energy supply chains.
United States Antimony Corp
United States Antimony Corp (UAMY) was incorporated in Montana in 1969 and has operated the Bear River Zeolite mine in Idaho and the antimony mines in the Stibnite-Yellow Pine district. The company's core asset is the permitted, operating antimony processing mill and the nearby mine, which have historically produced antimony oxide and metal for the Department of Defense and industrial buyers. The antimony is sold under a purchase contract with a domestic marketer, while the zeolite is marketed directly to water-treatment and agricultural customers. The firm extracts and processes two distinct industrial minerals. Antimony is its primary revenue driver, sold as lump sulfide ore, finished oxide, and metal, with key applications in munitions, flame-proofing plastics, and lead-acid battery alloys. The zeolite division mines a high-clinoptilolite mineral used for wastewater filtration, soil amendment, animal feed, and radioactive isotope absorption. Geographically, operations concentrate in Montana and Idaho, but the customer base extends nationally, with a strategic emphasis on replacing Chinese antimony imports for the US industrial base. In March 2024, UAMY appointed Gary C. Evans, a veteran Texas energy entrepreneur, as Co-CEO alongside veteran mining engineer Lloyd Bardswich, signaling a shift toward corporate restructuring and potential capital raising. The company has a small-cap listing on the NYSE American and has historically operated with a lean, mining-focused team split between the corporate office in Thompson Falls, Montana, and the extraction sites in Idaho. In September 2024, UAMY announced it had secured additional processing capacity and was evaluating a secondary antimony source to meet rising defense demand. UAMY's structural role is unique: it is the only publicly traded, operating domestic miner and processor of antimony in the United States at a moment when the Pentagon and Department of Energy are actively funding domestic critical-mineral supply chains. No other listed US company combines antimony extraction, milling, and zeolite production under one roof, making it a bottleneck asset in the effort to decouple American defense and energy manufacturing from Chinese antimony dominance.
General information
Firm type
other
Year founded
1969
AUM
Undisclosed
Location
Region
North America
Country
United States
City
Thompson Falls
Corporate office
Thompson Falls, MT, United States
Principals
Gary C. Evans
Co-CEO and Chairman
Lloyd Bardswich
Co-CEO
Sector focus
Frequently asked questions
What does United States Antimony Corp actually produce?
United States Antimony Corp produces antimony oxide, antimony metal, and lump sulfide ore from its operations in Montana, as well as high-clinoptilolite zeolite from its mine in Idaho. Antimony is a critical mineral used primarily as a flame retardant in plastics and textiles, an alloying agent in lead-acid batteries, and in munitions. Zeolite is sold for water filtration, soil remediation, animal feed, and nuclear waste absorption.
Why is US Antimony considered strategically important right now?
China, Russia, and Tajikistan control the vast majority of the world's antimony mine production and processing. United States Antimony Corp operates the only active, permitted domestic antimony processing facility and the only US mine with established production, making it the sole domestic link in the antimony supply chain. The Department of Defense has identified antimony as a critical mineral, and UAMY's existing contracts and capacity place it at the center of efforts to re-shore defense and energy manufacturing.
Who runs the company?
Gary C. Evans and Lloyd Bardswich serve as Co-Chief Executive Officers. Evans, appointed in March 2024, is a veteran corporate strategist who previously led Magnum Hunter Resources and other energy firms. Bardswich is a mining engineer with a long tenure at UAMY, overseeing operational continuity at the mines and the Thompson Falls mill.
How does US Antimony generate revenue?
The company generates revenue by selling antimony products — primarily oxide, metal, and lump ore — under a marketing agreement with a domestic broker, and by selling zeolite directly to industrial, agricultural, and municipal buyers. Historically, antimony has been the dominant revenue contributor, with revenue tied to contracted volumes and spot market pricing for critical minerals.
Does US Antimony participate in any government critical-mineral initiatives?
UAMY has supplied antimony to the Department of Defense for decades under commercial and direct contracts. In the current policy environment, the company is positioned as a potential direct beneficiary of the Defense Production Act (DPA) Title III and Department of Energy grant programs explicitly designed to fund domestic processing of antimony and other defense-critical minerals.
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