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5. PROPERTY, PLANT AND EQUIPMENT, NET (Details) - USD ($)
Jun. 30, 2016
Dec. 31, 2015
Property, Plant and Equipment [Abstract]    
Mineral rights $ 6,003,828 $ 6,131,230
Buildings 67,199,375 68,510,164
Plant and machinery 191,237,780 195,295,877
Motor vehicles 8,664 8,847
Furniture, fixtures and office equipment 4,763,536 4,864,619
Construction in progress 422,139 57,596
Total 269,635,322 274,868,333
Less: Accumulated depreciation and amortization (157,086,213) (146,997,010)
Net book value $ 112,549,109 $ 127,871,323