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Other Liabilities (Details) (USD $)
3 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Other current liabilities $ 1,675,000us-gaap_OtherLiabilitiesCurrent $ 2,551,000us-gaap_OtherLiabilitiesCurrent
Loss Contingency Accrual 1,300,000us-gaap_LossContingencyAccrualAtCarryingValue 2,200,000us-gaap_LossContingencyAccrualAtCarryingValue
Argentina Equity Tax 2009 Through 2012    
Other current liabilities 300,000us-gaap_OtherLiabilitiesCurrent
/ us-gaap_IncomeTaxAuthorityAxis
= aumn_ArgentinaEquityTax2009Through2012Member
300,000us-gaap_OtherLiabilitiesCurrent
/ us-gaap_IncomeTaxAuthorityAxis
= aumn_ArgentinaEquityTax2009Through2012Member
Interest and penalties 900,000us-gaap_IncomeTaxExaminationPenaltiesAndInterestExpense
/ us-gaap_IncomeTaxAuthorityAxis
= aumn_ArgentinaEquityTax2009Through2012Member
 
VAT tax credit 600,000aumn_VatTaxCredit
/ us-gaap_IncomeTaxAuthorityAxis
= aumn_ArgentinaEquityTax2009Through2012Member
 
Increase in tax liability $ 600,000aumn_IncreaseDecreaseInIncomeTaxLiability
/ us-gaap_IncomeTaxAuthorityAxis
= aumn_ArgentinaEquityTax2009Through2012Member