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MINING ASSET IMPAIRMENT AND INVENTORY WRITEDOWN (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Jun. 30, 2014
Sep. 30, 2014
Sep. 30, 2013
MINING ASSET IMPAIRMENT AND INVENTORY WRITEDOWN [Abstract]      
Mining asset impairment   $ 23,242 $ 0
Mining inventory writedown $ 11,555 $ 11,555 $ 0