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v3.20.1

LONG-TERM DEBT (Details) - Term Loan - Gold Bar Complex $ in Millions | Dec. 31, 2019 USD ($)
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Scheduled minimum interest payments |
2020 | $ 4.7
2021 | $ 2.0

X
- Definition Amount of long-term debt interest payable for in the next twelve months. + References No definition available. + Details
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Namespace Prefix: | mux_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of long-term debt interest payable for remainder in the second fiscal year. + References No definition available. + Details
Name: | mux_LongTermDebtMaturitiesRepaymentsOfInterestInYearTwo
Namespace Prefix: | mux_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

X
- Details
Name: | us-gaap_DebtInstrumentAxis=mux_TermLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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