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PREPAID EXPENSE AND OTHER CURRENT ASSETS (Details) - USD ($)
Dec. 31, 2018
Dec. 31, 2017
Spare parts $ 5,011,781 $ 5,598,073
Prepaid value added tax ("VAT") 4,768,552 0
Prepaid insurance fee 153,751 285,650
Others 401,417 805,900
Total $ 10,335,501 $ 6,689,623