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INCOME TAXES (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Tax loss carry forwards $ 330,200,000us-gaap_OperatingLossCarryforwards $ 303,300,000us-gaap_OperatingLossCarryforwards
Deferred tax assets:    
Alternative minimum tax (AMT) credit carryforward 41,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax 41,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax
Net operating loss carryforward 108,070,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwards 98,734,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Mineral properties 14,797,000us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment 19,884,000us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment
Other temporary differences 6,859,000us-gaap_DeferredTaxAssetsOther 6,302,000us-gaap_DeferredTaxAssetsOther
Capital loss carryforward 241,000us-gaap_DeferredTaxAssetsCapitalLossCarryforwards 241,000us-gaap_DeferredTaxAssetsCapitalLossCarryforwards
Total gross deferred tax assets 130,008,000us-gaap_DeferredTaxAssetsGross 125,202,000us-gaap_DeferredTaxAssetsGross
Less: valuation allowance (129,794,000)us-gaap_DeferredTaxAssetsValuationAllowance (125,202,000)us-gaap_DeferredTaxAssetsValuationAllowance
Net deferred tax assets (214,000)us-gaap_DeferredTaxAssetsNet  
Deferred tax liabilities:    
Investments (214,000)us-gaap_DeferredTaxLiabilitiesInvestments  
Acquisition mineral property interests (51,899,000)mux_DeferredTaxLiabilitiesAcquisitionOfMineralProperties (158,855,000)mux_DeferredTaxLiabilitiesAcquisitionOfMineralProperties
Total deferred tax liabilities (52,113,000)us-gaap_DeferredIncomeTaxLiabilities (158,855,000)us-gaap_DeferredIncomeTaxLiabilities
Total net deferred tax liability (51,899,000)us-gaap_DeferredTaxLiabilities (158,855,000)us-gaap_DeferredTaxLiabilities
Valuation allowance    
Change in valuation allowance 4,500,000us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount 34,700,000us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount
Minera Andes    
Deferred tax liabilities:    
Acquisition mineral property interests $ 26,600,000mux_DeferredTaxLiabilitiesAcquisitionOfMineralProperties
/ us-gaap_BusinessAcquisitionAxis
= mux_MineraAndesIncMember		 $ 101,500,000mux_DeferredTaxLiabilitiesAcquisitionOfMineralProperties
/ us-gaap_BusinessAcquisitionAxis
= mux_MineraAndesIncMember