United States Antimony Corporation is engaged in the processing and sale of antimony and precious metals, primarily gold and silver, and zeolite products. Its segments include antimony and zeolite. Its antimony segment consists of its facility located in the Burns Mining District of Sanders County in Montana that processes ore primarily into antimony oxide, antimony metal, antimony trisulfide, and precious metals, and its two facilities in its US Antimony de Mexico, S.A. de C.V. subsidiary located in Mexico that process ore primarily into antimony metal and a lower grade of antimony oxide. Its antimony oxide is used to form a flame-retardant system for plastics, rubber, fiberglass, textile goods, paints, coatings, and paper. Its zeolite segment includes its vertically integrated Bear River Zeolite facility located in Preston, Idaho that mines, processes, and sells zeolite. Its zeolite is used for water filtration, sewage treatment, nuclear waste and other environmental cleanup.