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SHAREHOLDERS' EQUITY (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
item
Exchangeable shares converted into common stock 900,000us-gaap_ConversionOfStockSharesConverted1
Number of mining contractors with which the entity has entered into an agreement 1mux_NumberOfMiningContractorsWithWhichEntityHasEnteredIntoAgreement
Stock Issued During Period, Value, Issued for Services $ 443us-gaap_StockIssuedDuringPeriodValueIssuedForServices
Common Stock  
Shares issued for settlement of accounts payable (in shares) 430,295mux_SharesIssuedDuringPeriodSharesIssuedForServices
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
Stock Issued During Period, Value, Issued for Services $ 443us-gaap_StockIssuedDuringPeriodValueIssuedForServices
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember