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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 1,499,000us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised 48,000us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised 445,000us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised       198,000us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
/ us-gaap_BusinessAcquisitionAxis
= mux_MineraAndesIncMember		 198,000us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
/ us-gaap_BusinessAcquisitionAxis
= mux_MineraAndesIncMember		 45,000us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
/ us-gaap_BusinessAcquisitionAxis
= mux_MineraAndesIncMember		 45,000us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
/ us-gaap_BusinessAcquisitionAxis
= mux_MineraAndesIncMember
Weighted average exercise price of stock options (in dollars per share) $ 1.29us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice $ 1.97us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice $ 1.84us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice         1.96us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice
/ us-gaap_BusinessAcquisitionAxis
= mux_MineraAndesIncMember		   1.80us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice
/ us-gaap_BusinessAcquisitionAxis
= mux_MineraAndesIncMember
Proceeds from Stock Options Exercised $ 2,292,000us-gaap_ProceedsFromStockOptionsExercised $ 171,000us-gaap_ProceedsFromStockOptionsExercised $ 3,885,000us-gaap_ProceedsFromStockOptionsExercised     $ 0.4us-gaap_ProceedsFromStockOptionsExercised
/ us-gaap_BusinessAcquisitionAxis
= mux_MineraAndesIncMember		        
Proceeds from issuance of new shares, net of expenses             400,000us-gaap_ProceedsFromIssuanceOrSaleOfEquity
/ us-gaap_BusinessAcquisitionAxis
= mux_MineraAndesIncMember		   100,000us-gaap_ProceedsFromIssuanceOrSaleOfEquity
/ us-gaap_BusinessAcquisitionAxis
= mux_MineraAndesIncMember		  
Exchangeable shares converted into common stock 3,700,000us-gaap_ConversionOfStockSharesConverted1 51,100,000us-gaap_ConversionOfStockSharesConverted1                
Exchangeable, shares outstanding 28,521,000us-gaap_CommonStockOtherSharesOutstanding 32,246,000us-gaap_CommonStockOtherSharesOutstanding                
Agreement to Terminate TNR Gold Corp Back In Right                    
Shares issued to terminate TNR Gold Corp's back-in right (in shares)       850,000us-gaap_StockIssuedDuringPeriodSharesOther
/ dei_LegalEntityAxis
= mux_TNRGoldCorpMember		            
Shares issued to TNR Gold Corp's to terminate back-in-right $ 1,352,000us-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