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INVESTMENT IN MINERA SANTA CRUZ S.A. ("MSC") - SAN JOSE MINE (Details 2) (USD $) In Thousands, unless otherwise specified | 12 Months Ended | 11 Months Ended
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2012
Change in the investment in MSC |  |  |  |
Investment in MSC, beginning balance | $ 212,947 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures | $ 273,948 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures |  |
Income tax recovery | (107,170)us-gaap_IncomeTaxExpenseBenefit | (53,365)us-gaap_IncomeTaxExpenseBenefit | (27,244)us-gaap_IncomeTaxExpenseBenefit |
Impairment of investment in MSC | (21,162)us-gaap_EquityMethodInvestmentOtherThanTemporaryImpairment | (95,878)us-gaap_EquityMethodInvestmentOtherThanTemporaryImpairment |  |
Investment in MSC, ending balance | 177,018 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures | 212,947 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures | 273,948 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures | 273,948 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
MSC |  |  |  |
Change in the investment in MSC |  |  |  |
Investment in MSC, beginning balance | 212,947 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = mux_MineraSantaCruzSAMember | 273,948 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = mux_MineraSantaCruzSAMember |  |
Attributable net (loss) income from MSC | (2,597)mux_IncomeLossFromEquityMethodInvestmentsBeforeAmortization / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = mux_MineraSantaCruzSAMember | 2,126 mux_IncomeLossFromEquityMethodInvestmentsBeforeAmortization / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = mux_MineraSantaCruzSAMember |  | 25,301 mux_IncomeLossFromEquityMethodInvestmentsBeforeAmortization / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = mux_MineraSantaCruzSAMember
Amortization of fair value increments | (13,190)mux_AmortizationOfFairValueIncrementsFromEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = mux_MineraSantaCruzSAMember | (18,425)mux_AmortizationOfFairValueIncrementsFromEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = mux_MineraSantaCruzSAMember |  | (22,682)mux_AmortizationOfFairValueIncrementsFromEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = mux_MineraSantaCruzSAMember
Income tax recovery | 10,503 us-gaap_IncomeTaxExpenseBenefit / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = mux_MineraSantaCruzSAMember | 17,145 us-gaap_IncomeTaxExpenseBenefit / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = mux_MineraSantaCruzSAMember |  | 18,217 us-gaap_IncomeTaxExpenseBenefit / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = mux_MineraSantaCruzSAMember
Dividend distribution received | (9,483)us-gaap_EquityMethodInvestmentDividendsOrDistributions / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = mux_MineraSantaCruzSAMember | (1,826)us-gaap_EquityMethodInvestmentDividendsOrDistributions / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = mux_MineraSantaCruzSAMember |  |
Impairment of investment in MSC | (21,162)us-gaap_EquityMethodInvestmentOtherThanTemporaryImpairment / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = mux_MineraSantaCruzSAMember | (95,878)us-gaap_EquityMethodInvestmentOtherThanTemporaryImpairment / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = mux_MineraSantaCruzSAMember |  |
Contribution of Santa Cruz exploration properties, net of tax |  | 35,857 mux_MineralPropertyInterestsTransferNetOfTax / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = mux_MineraSantaCruzSAMember |  |
Investment in MSC, ending balance | $ 177,018 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = mux_MineraSantaCruzSAMember | $ 212,947 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = mux_MineraSantaCruzSAMember | $ 273,948 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = mux_MineraSantaCruzSAMember | $ 273,948 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = mux_MineraSantaCruzSAMember

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- Definition Total investments in (A) an entity in which the entity has significant influence, but does not have control, (B) subsidiaries that are not required to be consolidated and are accounted for using the equity and or cost method, and (C) an entity in which the reporting entity shares control of the entity with another party or group. Includes long-term advances receivable from a party that is affiliated with the reporting entity by means of direct or indirect ownership. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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