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MINERAL PROPERTY INTEREST AND ASSET RETIREMENT OBLIGATIONS - Amortization of Mineral Property Interests and Asset Retirement Costs (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Mineral Property Interests |  |  |  |
Amortization of mineral property interests and asset retirement obligations |  |  | $ 1,845 | $ 966
El Gallo 1 mine |  |  |  |
Mineral Property Interests |  |  |  |
Amortization of mineral property interests and asset retirement obligations | $ 700 | $ 300 | 1,800 | 1,000
Amortization of capitalized asset retirement costs | $ 100 | $ 100 | $ 400 | $ 300

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- Definition Represents the amount of amortization expense related to the capitalized asset retirement costs. + References No definition available. + Details
Name: | mux_AssetRetirementObligationsAmortization
Namespace Prefix: | mux_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Represents the amount of amortization expense related to the mineral property interests and capitalized asset retirement costs. + References No definition available. + Details
Name: | mux_MineralPropertyInterestsAndAssetRetirementObligationsAmortization
Namespace Prefix: | mux_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Mineral Property Interests [Line Items] + References No definition available. + Details
Name: | mux_MineralsPropertyInterestsLineItems
Namespace Prefix: | mux_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | mux_MineralPropertyNameAxis=mux_ElGalloComplexMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |