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1. Background of Company and Basis of Presentation | 12 Months Ended
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Dec. 31, 2018
Accounting Policies [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 Lanxess Laurel US LLC (“Lanxess Laurel”), 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. See Note 11.

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- Definition The entire disclosure for the business description and basis of presentation concepts. Business description describes the nature and type of organization including but not limited to organizational structure as may be applicable to holding companies, parent and subsidiary relationships, business divisions, business units, business segments, affiliates and information about significant ownership of the reporting entity. Basis of presentation describes the underlying basis used to prepare the financial statements (for example, US Generally Accepted Accounting Principles, Other Comprehensive Basis of Accounting, IFRS). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -URI http://asc.fasb.org/topic&trid=2122369 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -URI http://asc.fasb.org/topic&trid=2122149 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -URI http://asc.fasb.org/topic&trid=2134479 + Details
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