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5. PROPERTY, PLANT AND EQUIPMENT, NET (Tables)
12 Months Ended
Dec. 31, 2015
Property, Plant and Equipment [Abstract]  
Property, plant and equipment
    As of December 31,  
    2015     2014  
At cost:            
Mineral rights   $ 6,131,230     $ 6,506,668  
Buildings     68,510,164       53,231,127  
Plant and machinery     195,295,877       177,485,689  
Motor vehicles     8,847       9,389  
Furniture, fixtures and office equipment     4,864,619       4,884,991  
Construction in progress     57,596       -  
Total     274,868,333       242,117,864  
Less: accumulated depreciation and amortization     (146,997,010 )     (117,767,083 )
Net book value   $ 127,871,323     $ 124,350,781