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5. PROPERTY, PLANT AND EQUIPMENT, NET (Details) - USD ($)
Sep. 30, 2016
Dec. 31, 2015
Property, Plant and Equipment [Abstract]    
Mineral rights $ 5,962,024 $ 6,131,230
Buildings 67,594,932 68,510,164
Plant and machinery 203,242,535 195,295,877
Motor vehicles 8,603 8,847
Furniture, fixtures and office equipment 4,730,368 4,864,619
Construction in progress 172,925 57,596
Total 282,071,387 274,868,333
Less: Accumulated depreciation and amortization (159,646,621) (146,997,010)
Net book value $ 122,424,766 $ 127,871,323