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13. Business Segments (Details) (USD $)
Mar. 31, 2015
Dec. 31, 2014
Properties, plants and equipment, net $ 13,835,448us-gaap_PropertyPlantAndEquipmentNet $ 13,511,803us-gaap_PropertyPlantAndEquipmentNet
Total Assets 18,194,262us-gaap_Assets 16,545,031us-gaap_Assets
United States Antimony [Member]    
Properties, plants and equipment, net 1,921,744us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementBusinessSegmentsAxis
= UAMY_UnitedStatesAntimonyMember
1,936,894us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementBusinessSegmentsAxis
= UAMY_UnitedStatesAntimonyMember
Total Assets 3,465,507us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= UAMY_UnitedStatesAntimonyMember
3,045,426us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= UAMY_UnitedStatesAntimonyMember
Mexico Antimony [Member]    
Properties, plants and equipment, net 10,380,090us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementBusinessSegmentsAxis
= UAMY_MexicoAntimonyMember
9,996,579us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementBusinessSegmentsAxis
= UAMY_MexicoAntimonyMember
Total Assets 12,824,312us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= UAMY_MexicoAntimonyMember
11,415,198us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= UAMY_MexicoAntimonyMember
Subtotal Antimony [Member]    
Properties, plants and equipment, net 12,301,834us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementBusinessSegmentsAxis
= UAMY_SubtotalAntimonyMember
11,933,473us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementBusinessSegmentsAxis
= UAMY_SubtotalAntimonyMember
Total Assets 16,289,819us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= UAMY_SubtotalAntimonyMember
14,460,624us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= UAMY_SubtotalAntimonyMember
Zeolite [Member]    
Properties, plants and equipment, net 1,533,614us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementBusinessSegmentsAxis
= UAMY_ZeoliteMember
1,578,330us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementBusinessSegmentsAxis
= UAMY_ZeoliteMember
Total Assets $ 1,904,443us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= UAMY_ZeoliteMember
$ 2,084,407us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= UAMY_ZeoliteMember