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4. PROPERTY, PLANT AND EQUIPMENT, NET (Tables)
12 Months Ended
Dec. 31, 2014
Property, Plant and Equipment [Abstract]  
Property, plant and equipment
    As of December 31,  
    2014     2013  
At cost:            
Mineral rights   $ 6,506,668     $ 6,530,158  
Buildings     53,231,127       53,343,419  
Plant and machinery     177,485,689       172,842,611  
Motor vehicles     9,389       9,423  
Furniture, fixtures and office equipment     4,884,991       4,902,627  
Total     242,117,864       237,628,238  
Less: accumulated depreciation and amortization     (117,767,083 )     (91,227,802 )
Net book value   $ 124,350,781     $ 146,400,436