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PREPAID EXPENSE AND OTHER CURRENT ASSETS (Details) - USD ($)
Dec. 31, 2016
Dec. 31, 2015
Spare parts $ 5,732,914 $ 6,052,315
Prepaid Value added tax ("VAT") 1,808,141 5,552,772
Prepaid insurance fee 259,650 347,631
Others 226,962 282,423
Total $ 8,027,667 $ 12,235,141