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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	$ 200,000us-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	1,849,000us-gaap_IncomeTaxReconciliationEquityInEarningsLossesOfUnconsolidatedSubsidiary	(2,924,000)us-gaap_IncomeTaxReconciliationEquityInEarningsLossesOfUnconsolidatedSubsidiary	(7,292,000)us-gaap_IncomeTaxReconciliationEquityInEarningsLossesOfUnconsolidatedSubsidiary
Prior year true ups/acquisitions	8,330,000us-gaap_IncomeTaxReconciliationPriorYearIncomeTaxes	(19,016,000)us-gaap_IncomeTaxReconciliationPriorYearIncomeTaxes	781,000us-gaap_IncomeTaxReconciliationPriorYearIncomeTaxes
Adjustment for foreign tax rates	(2,557,000)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential	8,680,000us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential	3,245,000us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential
Tax rate changes		(187,000)us-gaap_IncomeTaxReconciliationChangeInEnactedTaxRate	(1,869,000)us-gaap_IncomeTaxReconciliationChangeInEnactedTaxRate
Imputed interest	198,000mux_IncomeTaxReconciliationImputedInterest	171,000mux_IncomeTaxReconciliationImputedInterest	135,000mux_IncomeTaxReconciliationImputedInterest
Other permanent differences	(7,552,000)us-gaap_IncomeTaxReconciliationOtherAdjustments	22,090,000us-gaap_IncomeTaxReconciliationOtherAdjustments	(3,259,000)us-gaap_IncomeTaxReconciliationOtherAdjustments
Unrealized foreign exchange rate (loss)/gain	19,447,000mux_IncomeTaxReconciliationUnrealizedForeignCurrencyExchangeRateGainLoss	(28,317,000)mux_IncomeTaxReconciliationUnrealizedForeignCurrencyExchangeRateGainLoss	(21,263,000)mux_IncomeTaxReconciliationUnrealizedForeignCurrencyExchangeRateGainLoss
NOL expired	10,268,000mux_IncomeTaxReconciliationNetOperatingLossExpired	1,711,000mux_IncomeTaxReconciliationNetOperatingLossExpired	(2,696,000)mux_IncomeTaxReconciliationNetOperatingLossExpired
Valuation allowance	4,592,000us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	34,725,000us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	36,899,000us-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	0us-gaap_UnrecognizedTaxBenefits
Income tax benefit not allocated to other comprehensive income	200,000mux_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				0mux_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	$ 754,000mux_IncomeTaxReconciliationImpactOfTaxReform / us-gaap_IncomeTaxAuthorityAxis = country_MX	$ (1,921,000)mux_IncomeTaxReconciliationImpactOfTaxReform / us-gaap_IncomeTaxAuthorityAxis = country_MX

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