United States Antimony Corporation (USAC) is a US-based natural resource company focused on antimony, zeolite, and precious metals. The company engages in the mining, transportation, milling, smelting, refining and marketing of minerals obtained from around the world. USAC's wholly-owned subsidiaries United States Antimony S.A. de C.V. (USAMSA) and Antimonio de Mexico S.A. de C.V. carry out silver and antimony exploration, development, mining and smelting activities in Mexico, and it has three mills in the country. The firm's Mexican assets are the Los Juarez mineral deposit with concessions in Queretaro, the Wadley mining concession in San Luis Potosi, the Soyatal deposits in Queretaro, and the Guadalupe properties in Zacatecas. USAC was incorporated in 1969 and is based in Montana.