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CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical) (USD $) In Thousands, unless otherwise specified | 9 Months Ended
--- | ---
Sep. 30, 2014 | Sep. 30, 2013
CONSOLIDATED STATEMENTS OF CASH FLOWS |  |
Collection Of Value Added Taxes Receivable | $ 5,049 | $ 0

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

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- Details
Name: | us-gaap_StatementOfCashFlowsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration