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4. PROPERTY, PLANT AND EQUIPMENT, NET (Details) - USD ($)
Mar. 31, 2017
Dec. 31, 2016
Property, Plant and Equipment [Abstract]    
Mineral rights $ 4,462,438 $ 4,438,115
Buildings 62,300,940 61,656,398
Plant and machinery 185,802,691 184,544,140
Motor vehicles 8,327 8,282
Furniture, fixtures and office equipment 4,578,428 4,553,473
Construction in progress 0 374,790
Total 257,152,824 255,575,198
Less: Accumulated depreciation and amortization (152,998,604) (146,844,072)
Net book value $ 104,154,220 $ 108,731,126