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COMMITMENTS AND CONTINGENCIES (Details) - USD ($) $ in Millions | 9 Months Ended |
--- | --- | ---
Sep. 30, 2016 | Dec. 31, 2015
COMMITMENTS AND CONTINGENCIES. |  |
Outstanding surety bonds | $ 4.8 | $ 4.8
Percentage of annual fees on surety bonds | 1.50% |
Percentage of upfront deposit on surety bonds | 10.00% |
Surety bonds upfront deposit amount | $ 0.5 |

X
- Definition The value of the outstanding surety bonds. + References No definition available. + Details
Name: | mux_OutstandingSuretyBonds
Namespace Prefix: | mux_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Represents the percentage of annual fees on the value of the surety bonds. + References No definition available. + Details
Name: | mux_SuretyBondsAnnualFeesPercentage
Namespace Prefix: | mux_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the amount of upfront deposit on the value of surety bonds. + References No definition available. + Details
Name: | mux_SuretyBondsUpfrontDepositAmount
Namespace Prefix: | mux_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the percentage of upfront deposit on the value of the surety bonds. + References No definition available. + Details
Name: | mux_SuretyBondsUpfrontDepositPercentage
Namespace Prefix: | mux_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration