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5. PROPERTY, PLANT AND EQUIPMENT, NET (Details) - USD ($)
Sep. 30, 2015
Dec. 31, 2014
Property, Plant and Equipment [Abstract]    
Mineral rights $ 6,258,632 $ 6,506,668
Buildings 70,127,755 53,231,127
Plant and machinery 187,202,515 177,485,689
Motor vehicles 9,031 9,389
Furniture, fixtures and office equipment 4,965,702 4,884,991
Total 268,563,635 242,117,864
Less: Accumulated depreciation and amortization (143,122,022) (117,767,083)
Net book value $ 125,441,613 $ 124,350,781