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MINING ASSET IMPAIRMENT AND INVENTORY WRITEDOWN (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
MINING ASSET IMPAIRMENT AND INVENTORY WRITEDOWN [Abstract]      
Mining asset impairment $ 23,242us-gaap_AssetImpairmentCharges $ 0us-gaap_AssetImpairmentCharges $ 0us-gaap_AssetImpairmentCharges
Mining inventory writedown $ 16,690us-gaap_InventoryWriteDown $ 0us-gaap_InventoryWriteDown $ 0us-gaap_InventoryWriteDown