1. Background of Company and Basis of Presentation	12 Months Ended
Dec. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Background of Company and Basis of Presentation	AGAU Mines, Inc., predecessor of United States Antimony Corporation ("USAC" or "the Company"), was incorporated in June 1968 as a Delaware corporation to mine gold and silver. USAC was incorporated in Montana in January 1970 to mine and produce antimony products. In June 1973, AGAU Mines, Inc. was merged into USAC. In December 1983, the Company suspended its antimony mining operations when it became possible to purchase antimony raw materials more economically from foreign sources. The principal business of the Company has been the production and sale of antimony products. During 2000, the Company formed a 75% owned subsidiary, Bear River Zeolite Company ("BRZ"), to mine and market zeolite and zeolite products from a mineral deposit in southeastern Idaho. In 2001, an operating plant was constructed at the zeolite site and zeolite production and sales commenced. During 2002, the Company acquired the remaining 25% of BRZ and continued to produce and sell zeolite products. During 2005, the Company formed a 100% owned subsidiary, Antimonio de Mexico S.A. de C.V. (“AM”), to explore and develop potential antimony properties in Mexico. During 2006, the Company acquired 100% ownership in United States Antimony, Mexico S.A. de C.V. (“USAMSA”), which became a wholly-owned subsidiary of the Company. In 2018, the Company acquired 100% ownership in Stibnite Holding Company US Inc. (previously Lanxess Holding Company US Inc.), Antimony Mining and Milling US LLC (previously Lanxess Laurel US LLC), a Delaware limited liability company and Lanxess Laurel de Mexico, S.A. de C.V (“Lanxess Laurel Mexico”), a Mexico corporation, both of which became a wholly-owned subsidiary of the Company. COVID-19 Coronavirus Pandemic Response and Impact Following the outbreak of the COVID-19 coronavirus global pandemic ("COVID-19") in early 2020, in March 2020 the U.S. Centers for Disease Control issued guidelines to mitigate the spread and health consequences of COVID-19. The Company implemented changes to its operations and business practices to follow the guidelines and minimize physical interaction, including using technology to allow employees to work from home when possible and altering production procedures and schedules, asset maintenance, and limiting discretionary spending. As long as they are required, the operational practices implemented could have an adverse impact on our operating results due to deferred production and revenues or additional costs. The negative impact of COVID-19 remains uncertain, including on overall business and market conditions. The impact of these restrictions on our business has been minimal. It is possible that future restrictions could have an adverse impact on our operations or financial results beyond 2020.

1. Background of Company and Basis of Presentation

12 Months Ended

Dec. 31, 2020

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Background of Company and Basis of Presentation

AGAU Mines, Inc., predecessor of United States Antimony Corporation ("USAC" or "the Company"), was incorporated in June 1968 as a Delaware corporation to mine gold and silver. USAC was incorporated in Montana in January 1970 to mine and produce antimony products. In June 1973, AGAU Mines, Inc. was merged into USAC. In December 1983, the Company suspended its antimony mining operations when it became possible to purchase antimony raw materials more economically from foreign sources. The principal business of the Company has been the production and sale of antimony products.

During 2000, the Company formed a 75% owned subsidiary, Bear River Zeolite Company ("BRZ"), to mine and market zeolite and zeolite products from a mineral deposit in southeastern Idaho. In 2001, an operating plant was constructed at the zeolite site and zeolite production and sales commenced. During 2002, the Company acquired the remaining 25% of BRZ and continued to produce and sell zeolite products.

During 2005, the Company formed a 100% owned subsidiary, Antimonio de Mexico S.A. de C.V. (“AM”), to explore and develop potential antimony properties in Mexico.

During 2006, the Company acquired 100% ownership in United States Antimony, Mexico S.A. de C.V. (“USAMSA”), which became a wholly-owned subsidiary of the Company.

In 2018, the Company acquired 100% ownership in Stibnite Holding Company US Inc. (previously Lanxess Holding Company US Inc.), Antimony Mining and Milling US LLC (previously Lanxess Laurel US LLC), a Delaware limited liability company and Lanxess Laurel de Mexico, S.A. de C.V (“Lanxess Laurel Mexico”), a Mexico corporation, both of which became a wholly-owned subsidiary of the Company.

COVID-19 Coronavirus Pandemic Response and Impact

Following the outbreak of the COVID-19 coronavirus global pandemic ("COVID-19") in early 2020, in March 2020 the U.S. Centers for Disease Control issued guidelines to mitigate the spread and health consequences of COVID-19. The Company implemented changes to its operations and business practices to follow the guidelines and minimize physical interaction, including using technology to allow employees to work from home when possible and altering production procedures and schedules, asset maintenance, and limiting discretionary spending. As long as they are required, the operational practices implemented could have an adverse impact on our operating results due to deferred production and revenues or additional costs. The negative impact of COVID-19 remains uncertain, including on overall business and market conditions. The impact of these restrictions on our business has been minimal. It is possible that future restrictions could have an adverse impact on our operations or financial results beyond 2020.