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INVESTMENT IN MINERA SANTA CRUZ S.A. (''MSC'') - SAN JOSE MINE (Details 3) (USD $) In Thousands, unless otherwise specified	3 Months Ended		12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
INVESTMENT IN MINERA SANTA CRUZ S.A. ("MSC") - SAN JOSE MINE
Income tax recovery	$ (1,163)us-gaap_IncomeTaxExpenseBenefit	$ (18,957)us-gaap_IncomeTaxExpenseBenefit
Income on investment in Minera Santa Cruz S.A. (net of amortization)	329us-gaap_IncomeLossFromEquityMethodInvestments	7,029us-gaap_IncomeLossFromEquityMethodInvestments
MSC
INVESTMENT IN MINERA SANTA CRUZ S.A. ("MSC") - SAN JOSE MINE
Net sales percentage	100.00%mux_EquityMethodInvestmentSummarizedFinancialInformationRevenuePercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = mux_MineraSantaCruzSAMember	100.00%mux_EquityMethodInvestmentSummarizedFinancialInformationRevenuePercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = mux_MineraSantaCruzSAMember
Net sales	45,891us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = mux_MineraSantaCruzSAMember	56,889us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = mux_MineraSantaCruzSAMember
Production costs applicable to sales	(36,863)us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCostOfSales / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = mux_MineraSantaCruzSAMember	(39,637)us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCostOfSales / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = mux_MineraSantaCruzSAMember
Net income	1,232us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = mux_MineraSantaCruzSAMember	6,182us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = mux_MineraSantaCruzSAMember
Ownership interest (as a percent)	49.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = mux_MineraSantaCruzSAMember	49.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = mux_MineraSantaCruzSAMember
Net income on investment in MSC	604mux_IncomeLossFromEquityMethodInvestmentsBeforeAmortization / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = mux_MineraSantaCruzSAMember	3,029mux_IncomeLossFromEquityMethodInvestmentsBeforeAmortization / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = mux_MineraSantaCruzSAMember	(2,597)mux_IncomeLossFromEquityMethodInvestmentsBeforeAmortization / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = mux_MineraSantaCruzSAMember
Amortization of fair value increments	(2,687)mux_AmortizationOfFairValueIncrementsFromEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = mux_MineraSantaCruzSAMember	(2,701)mux_AmortizationOfFairValueIncrementsFromEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = mux_MineraSantaCruzSAMember	(13,190)mux_AmortizationOfFairValueIncrementsFromEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = mux_MineraSantaCruzSAMember
Income tax recovery	2,412us-gaap_IncomeTaxExpenseBenefit / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = mux_MineraSantaCruzSAMember	6,701us-gaap_IncomeTaxExpenseBenefit / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = mux_MineraSantaCruzSAMember	10,503us-gaap_IncomeTaxExpenseBenefit / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = mux_MineraSantaCruzSAMember
Income on investment in Minera Santa Cruz S.A. (net of amortization)	$ 329us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = mux_MineraSantaCruzSAMember	$ 7,029us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = mux_MineraSantaCruzSAMember

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