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4. PROPERTY, PLANT AND EQUIPMENT, NET (Details) - USD ($)
Jun. 30, 2017
Dec. 31, 2016
Property, Plant and Equipment [Abstract]    
Mineral rights $ 4,544,643 $ 4,438,115
Buildings 63,448,611 61,656,398
Plant and machinery 189,225,440 184,544,140
Motor vehicles 8,480 8,282
Furniture, fixtures and office equipment 4,662,769 4,553,473
Construction in progress 0 374,790
Total 261,889,943 255,575,198
Less: Accumulated depreciation and amortization (161,177,525) (146,844,072)
Net book value $ 100,712,418 $ 108,731,126