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CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
REVENUE:
Gold and silver sales	$ 45,303us-gaap_RevenueMineralSales	$ 45,982us-gaap_RevenueMineralSales	$ 5,966us-gaap_RevenueMineralSales
Total Revenue	45,303us-gaap_Revenues	45,982us-gaap_Revenues	5,966us-gaap_Revenues
COSTS AND EXPENSES:
Production costs applicable to sales	40,608us-gaap_CostOfGoodsSold	34,594us-gaap_CostOfGoodsSold	3,861us-gaap_CostOfGoodsSold
Mine operating costs			8,507us-gaap_DirectOperatingCosts
Mine construction costs	1,723us-gaap_OtherConstructionCosts	1,383us-gaap_OtherConstructionCosts	14,260us-gaap_OtherConstructionCosts
Mine development costs	1,829us-gaap_ConstructionAndDevelopmentCosts	847us-gaap_ConstructionAndDevelopmentCosts
Exploration costs	11,332us-gaap_ExplorationExpenseMining	24,829us-gaap_ExplorationExpenseMining	47,179us-gaap_ExplorationExpenseMining
Property holding costs	6,365us-gaap_CarryingCostsPropertyAndExplorationRights	4,584us-gaap_CarryingCostsPropertyAndExplorationRights	7,207us-gaap_CarryingCostsPropertyAndExplorationRights
General and administrative expenses	12,069us-gaap_GeneralAndAdministrativeExpense	14,001us-gaap_GeneralAndAdministrativeExpense	16,841us-gaap_GeneralAndAdministrativeExpense
Acquisition costs			1,513us-gaap_BusinessCombinationAcquisitionRelatedCosts
Depreciation	979us-gaap_DepreciationDepletionAndAmortization	942us-gaap_DepreciationDepletionAndAmortization	1,033us-gaap_DepreciationDepletionAndAmortization
Accretion of asset retirement obligation and reclamation expenses (note 6)	407us-gaap_AssetRetirementObligationAccretionExpense	461us-gaap_AssetRetirementObligationAccretionExpense	447us-gaap_AssetRetirementObligationAccretionExpense
Loss (income) from investment in Minera Santa Cruz S.A., net of amortization (note 7)	5,284us-gaap_IncomeLossFromEquityMethodInvestments	(846)us-gaap_IncomeLossFromEquityMethodInvestments	(20,835)us-gaap_IncomeLossFromEquityMethodInvestments
Impairment of investment in Minera Santa Cruz S.A. (note 7)	21,162us-gaap_EquityMethodInvestmentOtherThanTemporaryImpairment	95,878us-gaap_EquityMethodInvestmentOtherThanTemporaryImpairment
Impairment of mineral property interests and property and equipment (note 6)	353,736us-gaap_AssetImpairmentCharges	62,963us-gaap_AssetImpairmentCharges	18,468us-gaap_AssetImpairmentCharges
Gain (loss) on sale of assets	(26)us-gaap_GainLossOnSaleOfPropertyPlantEquipment	6,743us-gaap_GainLossOnSaleOfPropertyPlantEquipment	(1,110)us-gaap_GainLossOnSaleOfPropertyPlantEquipment
Total costs and expenses	455,468us-gaap_CostsAndExpenses	246,379us-gaap_CostsAndExpenses	97,371us-gaap_CostsAndExpenses
Operating loss	(410,165)us-gaap_OperatingIncomeLoss	(200,397)us-gaap_OperatingIncomeLoss	(91,405)us-gaap_OperatingIncomeLoss
OTHER INCOME (EXPENSE):
Interest income, net of interest expense	259us-gaap_InvestmentIncomeInterest	262us-gaap_InvestmentIncomeInterest	228us-gaap_InvestmentIncomeInterest
Loss on sale of marketable equity securities			(70)us-gaap_MarketableSecuritiesRealizedGainLossExcludingOtherThanTemporaryImpairments
Other-than-temporary impairment on marketable equity securities			(1,993)us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsAvailableforsaleSecurities
(Loss) gain on sales of gold and silver bullion held as investments		(223)us-gaap_GainLossOnSaleOfInvestments	3,075us-gaap_GainLossOnSaleOfInvestments
Unrealized loss on gold and silver bullion held as investments			(359)us-gaap_UnrealizedGainLossOnInvestments
Registration taxes	(6,788)mux_RegistrationTaxes
Gain (loss) on litigation settlement		560us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet	(3,830)us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet
Foreign currency (loss) gain	(2,419)us-gaap_ForeignCurrencyTransactionGainLossBeforeTax	(1,309)us-gaap_ForeignCurrencyTransactionGainLossBeforeTax	456us-gaap_ForeignCurrencyTransactionGainLossBeforeTax
Total other income (expense)	(8,948)us-gaap_NonoperatingIncomeExpense	(710)us-gaap_NonoperatingIncomeExpense	(2,493)us-gaap_NonoperatingIncomeExpense
Loss before income taxes	(419,113)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	(201,107)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	(93,898)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Income tax recovery (note 9)	107,170us-gaap_IncomeTaxExpenseBenefit	53,365us-gaap_IncomeTaxExpenseBenefit	27,244us-gaap_IncomeTaxExpenseBenefit
Net loss	(311,943)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	(147,742)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	(66,654)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
OTHER COMPREHENSIVE INCOME (LOSS):
Reclassification of unrealized gain on marketable securities disposed of during the period, net of taxes			1,000us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax
Unrealized gain (loss) on available-for-sale securities, net of taxes	419us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent	(1)us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent	(5)us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent
Comprehensive loss	$ (311,524)us-gaap_ComprehensiveIncomeNetOfTax	$ (147,743)us-gaap_ComprehensiveIncomeNetOfTax	$ (65,659)us-gaap_ComprehensiveIncomeNetOfTax
Net loss per share (note 12):
Basic (in dollars per share)	$ (1.05)us-gaap_EarningsPerShareBasic	$ (0.50)us-gaap_EarningsPerShareBasic	$ (0.26)us-gaap_EarningsPerShareBasic
Diluted (in dollars per share)	$ (1.05)us-gaap_EarningsPerShareDiluted	$ (0.50)us-gaap_EarningsPerShareDiluted	$ (0.26)us-gaap_EarningsPerShareDiluted
Weighted average common shares outstanding (thousands) (note 12):
Basic (in shares)	297,763us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	297,041us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	261,223us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted (in shares)	297,763us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	297,041us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	261,223us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding

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