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PREPAID EXPENSE AND OTHER CURRENT ASSETS (Details) - USD ($)
Dec. 31, 2015
Dec. 31, 2014
PREPAID EXPENSE AND OTHER CURRENT ASSETS [Abstract]    
Spare parts $ 6,052,315 $ 6,385,388
Prepaid Value added tax ("VAT") 5,552,772 5,857,017
Prepaid insurance fee 347,631 226,564
Others 282,423 366,900
Total $ 12,235,141 $ 12,835,869