United States Antimony Corporation或者USAC,于1970年1月成立于蒙大拿州，致力于开采并生产锑产品。1983年，它停止了锑开采业务但继续从国内和国外原料基地生产锑产品。1998年3月，该公司成立了United States Antimony SA de CV 或 USAMSA，在墨西哥开采和冶炼锑。Bear River Zeolite公司成立于2000年，在爱达荷州东南地区开采并生产沸石。2005年8月19号，United States Antimony成立了Antimonio de Mexico，S. A. de C. V.，在墨西哥探索并开发锑及银矿，Antimonio de Mexico，S. A. de C. V.现在并入了USAMSA。该公司主要的业务就是生产和销售锑、银、金和沸石产品。
董事
名称
职位
Gary C. Evans
Chairman of the Board and Chief Executive Officer
Blaise Aguirre
Independent Director
John M. Keane
Independent Director
Joseph A. Carrabba
Independent Director
Joseph Bardswich
Director, Executive Vice President and Chief Mining Engineer
Michael A. Mcmanus, Jr
Independent Director
Jon R. Marinelli
Director
股东
名称
职位
Gary C. Evans
Chairman of the Board and Chief Executive Officer
Melissa M. Pagen
Senior Vice President, Corporate Development and Governmental Relations
Richard R. Isaak
Senior Vice President, Chief Financial Officer and Principal Accounting Officer
Jeffrey Fink
Vice President and General Manager, Bear River Zeolite
John C. Gustavsen
President, Antimony Division
Joseph Bardswich
Director, Executive Vice President and Chief Mining Engineer