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INVENTORIES (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Ore on leach pads $ 6,221,000mux_InventoryOreOnLeachPadsNetOfReserves $ 2,749,000mux_InventoryOreOnLeachPadsNetOfReserves
In-process inventory 2,302,000us-gaap_InventoryWorkInProcessNetOfReserves 2,681,000us-gaap_InventoryWorkInProcessNetOfReserves
Stockpiles   778,000mux_InventoryOreStockpilesNetOfReserves
Precious metals 2,403,000mux_InventoryPreciousMetalsNetOfReserves 1,300,000mux_InventoryPreciousMetalsNetOfReserves
Materials and supplies 1,478,000us-gaap_InventoryRawMaterialsAndSuppliesNetOfReserves 1,292,000us-gaap_InventoryRawMaterialsAndSuppliesNetOfReserves
Inventories 12,404,000us-gaap_InventoryNet 8,800,000us-gaap_InventoryNet
Cost of Sales    
Inventory write-down 2,000,000us-gaap_InventoryWriteDown
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_CostOfSalesMember		 0us-gaap_InventoryWriteDown
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_CostOfSalesMember
Ore on leach pads    
Inventory write-down 600,000us-gaap_InventoryWriteDown
/ us-gaap_PublicUtilitiesInventoryAxis
= mux_OreOnLeachPadsMember		  
In-process inventory    
Inventory write-down 1,200,000us-gaap_InventoryWriteDown
/ us-gaap_PublicUtilitiesInventoryAxis
= mux_InProcessInventoryMember		  
Precious metals    
Inventory write-down $ 200,000us-gaap_InventoryWriteDown
/ us-gaap_PublicUtilitiesInventoryAxis
= mux_PreciousMetalsMember