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INVENTORIES (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
INVENTORIES    
Ore on leach pads $ 6,456mux_InventoryOreOnLeachPadsNetOfReserves $ 6,221mux_InventoryOreOnLeachPadsNetOfReserves
In-process inventory 4,775us-gaap_InventoryWorkInProcessNetOfReserves 2,302us-gaap_InventoryWorkInProcessNetOfReserves
Precious metals 324mux_InventoryPreciousMetalsNetOfReserves 2,403mux_InventoryPreciousMetalsNetOfReserves
Materials and supplies 1,376us-gaap_InventoryRawMaterialsAndSuppliesNetOfReserves 1,478us-gaap_InventoryRawMaterialsAndSuppliesNetOfReserves
Inventories $ 12,931us-gaap_InventoryNet $ 12,404us-gaap_InventoryNet