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CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
CONSOLIDATED STATEMENTS OF CASH FLOWS |  |
Collection of VAT taxes receivable | $ 1,968 | $ 448

X
- Definition Represents information pertaining to collection of value added taxes receivable. + References No definition available. + Details
Name: | mux_CollectionOfValueAddedTaxesReceivable
Namespace Prefix: | mux_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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