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SHAREHOLDERS' EQUITY (Details) | 12 Months Ended | 0 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($) | Dec. 31, 2012 USD ($) | Dec. 31, 2014 TNR | Dec. 31, 2014 TNR Maximum | Jan. 24, 2012 Minera Andes USD ($) | Dec. 31, 2014 Minera Andes USD ($) | Dec. 31, 2014 Minera Andes CAD | Dec. 31, 2013 Minera Andes USD ($) | Dec. 31, 2013 Minera Andes CAD
Shares of common stock issued upon exercise of stock options | 1,499,000 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised | 48,000 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised | 445,000 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised |  |  |  | 198,000 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_BusinessAcquisitionAxis = mux_MineraAndesIncMember | 198,000 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_BusinessAcquisitionAxis = mux_MineraAndesIncMember | 45,000 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_BusinessAcquisitionAxis = mux_MineraAndesIncMember | 45,000 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_BusinessAcquisitionAxis = mux_MineraAndesIncMember
Weighted average exercise price of stock options (in dollars per share) | $ 1.29 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice | $ 1.97 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice | $ 1.84 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice |  |  |  |  | 1.96 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice / us-gaap_BusinessAcquisitionAxis = mux_MineraAndesIncMember |  | 1.80 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice / us-gaap_BusinessAcquisitionAxis = mux_MineraAndesIncMember
Proceeds from Stock Options Exercised | $ 2,292,000 us-gaap_ProceedsFromStockOptionsExercised | $ 171,000 us-gaap_ProceedsFromStockOptionsExercised | $ 3,885,000 us-gaap_ProceedsFromStockOptionsExercised |  |  | $ 0.4 us-gaap_ProceedsFromStockOptionsExercised / us-gaap_BusinessAcquisitionAxis = mux_MineraAndesIncMember |  |  |  |
Proceeds from issuance of new shares, net of expenses |  |  |  |  |  |  | 400,000 us-gaap_ProceedsFromIssuanceOrSaleOfEquity / us-gaap_BusinessAcquisitionAxis = mux_MineraAndesIncMember |  | 100,000 us-gaap_ProceedsFromIssuanceOrSaleOfEquity / us-gaap_BusinessAcquisitionAxis = mux_MineraAndesIncMember |
Exchangeable shares converted into common stock | 3,700,000 us-gaap_ConversionOfStockSharesConverted1 | 51,100,000 us-gaap_ConversionOfStockSharesConverted1 |  |  |  |  |  |  |  |
Exchangeable, shares outstanding | 28,521,000 us-gaap_CommonStockOtherSharesOutstanding | 32,246,000 us-gaap_CommonStockOtherSharesOutstanding |  |  |  |  |  |  |  |
Agreement to Terminate TNR Gold Corp Back In Right |  |  |  |  |  |  |  |  |  |
Shares issued to terminate TNR Gold Corp's back-in right (in shares) |  |  |  | 850,000 us-gaap_StockIssuedDuringPeriodSharesOther / dei_LegalEntityAxis = mux_TNRGoldCorpMember |  |  |  |  |  |
Shares issued to TNR Gold Corp's to terminate back-in-right | $ 1,352,000 us-gaap_StockIssuedDuringPeriodValueOther |  |  |  |  |  |  |  |  |
Percentage of royalty on project |  |  |  | 0.40%mux_PercentageOfRoyaltyOnProject / dei_LegalEntityAxis = mux_TNRGoldCorpMember |  |  |  |  |  |
Number of days of with in which project closed |  |  |  | 36 months |  |  |  |  |  |
Percentage of bonus on gross proceeds |  |  |  | 1.00%mux_PercentageOfBonusOnGrossProceeds / dei_LegalEntityAxis = mux_TNRGoldCorpMember |  |  |  |  |  |
Back-In Right Option giving TNR option of owning a certain percentage of the Los Azules deposit |  |  |  |  | 13.00%mux_BackInRightAsPercentageOfOwnership / dei_LegalEntityAxis = mux_TNRGoldCorpMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |  |  |

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