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INCOME TAXES (Details 2) (USD $) | 12 Months Ended | 0 Months Ended
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Jan. 01, 2014
INCOME TAXES |  |  |  |
Special mining duty (as a percent) | 7.50%mux_SpecialMiningDutyRate |  |  |
Accrued income tax | $ 200,000 us-gaap_TaxesPayableCurrent |  |  |
US Federal and State tax recovery at statutory rate | (142,499,000)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate | (68,377,000)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate | (31,925,000)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate |
Reconciling items: |  |  |  |
Equity pickup in MSC | 1,849,000 us-gaap_IncomeTaxReconciliationEquityInEarningsLossesOfUnconsolidatedSubsidiary | (2,924,000)us-gaap_IncomeTaxReconciliationEquityInEarningsLossesOfUnconsolidatedSubsidiary | (7,292,000)us-gaap_IncomeTaxReconciliationEquityInEarningsLossesOfUnconsolidatedSubsidiary |
Prior year true ups/acquisitions | 8,330,000 us-gaap_IncomeTaxReconciliationPriorYearIncomeTaxes | (19,016,000)us-gaap_IncomeTaxReconciliationPriorYearIncomeTaxes | 781,000 us-gaap_IncomeTaxReconciliationPriorYearIncomeTaxes |
Adjustment for foreign tax rates | (2,557,000)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential | 8,680,000 us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential | 3,245,000 us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential |
Tax rate changes |  | (187,000)us-gaap_IncomeTaxReconciliationChangeInEnactedTaxRate | (1,869,000)us-gaap_IncomeTaxReconciliationChangeInEnactedTaxRate |
Imputed interest | 198,000 mux_IncomeTaxReconciliationImputedInterest | 171,000 mux_IncomeTaxReconciliationImputedInterest | 135,000 mux_IncomeTaxReconciliationImputedInterest |
Other permanent differences | (7,552,000)us-gaap_IncomeTaxReconciliationOtherAdjustments | 22,090,000 us-gaap_IncomeTaxReconciliationOtherAdjustments | (3,259,000)us-gaap_IncomeTaxReconciliationOtherAdjustments |
Unrealized foreign exchange rate (loss)/gain | 19,447,000 mux_IncomeTaxReconciliationUnrealizedForeignCurrencyExchangeRateGainLoss | (28,317,000)mux_IncomeTaxReconciliationUnrealizedForeignCurrencyExchangeRateGainLoss | (21,263,000)mux_IncomeTaxReconciliationUnrealizedForeignCurrencyExchangeRateGainLoss |
NOL expired | 10,268,000 mux_IncomeTaxReconciliationNetOperatingLossExpired | 1,711,000 mux_IncomeTaxReconciliationNetOperatingLossExpired | (2,696,000)mux_IncomeTaxReconciliationNetOperatingLossExpired |
Valuation allowance | 4,592,000 us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance | 34,725,000 us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance | 36,899,000 us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance |
Other permanent differences | (107,170,000)us-gaap_IncomeTaxReconciliationOtherReconcilingItems | (53,365,000)us-gaap_IncomeTaxReconciliationOtherReconcilingItems | (27,244,000)us-gaap_IncomeTaxReconciliationOtherReconcilingItems |
Unrecognized tax benefits | 0 us-gaap_UnrecognizedTaxBenefits |  |  |
Income tax benefit not allocated to other comprehensive income | 200,000 mux_IncomeTaxExpenseBenefitNotAllocatedToOtherComprehensiveIncome |  |  |
MEXICO |  |  |  |
INCOME TAXES |  |  |  |
Foreign income tax rate (as a percent) |  |  |  | 30.00%mux_ForeignIncomeTaxRate / us-gaap_IncomeTaxAuthorityAxis = country_MX
Withholding tax on dividends paid to nonresident shareholders (as a percent) |  |  |  | 10.00%mux_PercentageOfWithholdingTaxOnDividendsPaidToNonResidentShareholders / us-gaap_IncomeTaxAuthorityAxis = country_MX
Extraordinary mining duty as a percentage of gross revenues from the sale of gold, silver and platinum |  |  |  | 0.50%mux_ExtraordinaryMiningDutyRateAsPercentageOfGrossRevenues / us-gaap_IncomeTaxAuthorityAxis = country_MX
Deductions related to development type costs |  |  |  | 0 mux_AmountOfDeductionsRelatedToDevelopmentTypeCosts / us-gaap_IncomeTaxAuthorityAxis = country_MX
Special mining duty (as a percent) |  |  |  | 7.50%mux_SpecialMiningDutyRate / us-gaap_IncomeTaxAuthorityAxis = country_MX
Reconciling items: |  |  |  |
Impact of Mexican tax reform | $ 754,000 mux_IncomeTaxReconciliationImpactOfTaxReform / us-gaap_IncomeTaxAuthorityAxis = country_MX | $ (1,921,000)mux_IncomeTaxReconciliationImpactOfTaxReform / us-gaap_IncomeTaxAuthorityAxis = country_MX |  |

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