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MINING ASSET IMPAIRMENT AND INVENTORY WRITEDOWN (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
MINING ASSET IMPAIRMENT AND INVENTORY WRITEDOWN [Abstract]    
Mining asset impairment $ 0 $ 23,242
Mining inventory writedown $ 0 $ 11,555