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5. PROPERTY, PLANT AND EQUIPMENT, NET (Details) - USD ($)
Mar. 31, 2016
Dec. 31, 2015
Property, Plant and Equipment [Abstract]    
Mineral rights $ 6,161,886 $ 6,131,230
Buildings 68,968,483 68,510,164
Plant and machinery 196,272,356 195,295,877
Motor vehicles 8,892 8,847
Furniture, fixtures and office equipment 4,888,942 4,864,619
Construction in progress 0 57,596
Total 276,300,559 274,868,333
Less: Accumulated depreciation and amortization (154,589,285) (146,997,010)
Net book value $ 121,711,274 $ 127,871,323