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MINING ASSET IMPAIRMENT AND INVENTORY WRITEDOWN (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
MINING ASSET IMPAIRMENT AND INVENTORY WRITEDOWN [Abstract]      
Mining asset impairment $ 0 $ 0 $ 23,242
Mining inventory writedown $ 0 $ 0 $ 16,690