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MINING ASSET IMPAIRMENT AND INVENTORY WRITEDOWN (Details) (USD $)
In Thousands, unless otherwise specified
6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
MINING ASSET IMPAIRMENT AND INVENTORY WRITEDOWN [Abstract]    
Mining asset impairment $ 23,242 $ 0
Mining inventory writedown $ 11,555 $ 0