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13. Business Segments (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Capital Expenditure	$ 5,002,392	$ 2,473,750	$ 994,731
United States Antimony [Member]
Capital Expenditure	288,364	160,536	31,300
Mexico Antimony [Member]
Capital Expenditure	4,385,983	1,988,345	927,131
Subtotal Antimony [Member]
Capital Expenditure	4,674,347	2,148,881	958,431
Zeolite [Member]
Capital Expenditure	$ 328,045	$ 324,869	$ 36,300

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- Definition

Capital Expenditure

+ References

No definition available.

+ Details

Name:	UAMY_CapitalExpenditure
Namespace Prefix:	UAMY_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration