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5. PROPERTY, PLANT AND EQUIPMENT, NET (Tables)
12 Months Ended
Dec. 31, 2013
Property, Plant and Equipment [Abstract]  
Property, plant and equipment
    As of December 31,  
    2013     2012  
At cost:            
Mineral rights   $ 6,530,158     $ 6,334,277  
Buildings     53,343,419       50,905,337  
Plant and machinery     172,842,611       166,121,329  
Motor vehicles     9,423       9,140  
Furniture, fixtures and office equipment     4,902,627       4,777,044  
Total     237,628,238       228,147,127  
Less: accumulated depreciation and amortization     (91,227,802 )     (62,204,585 )
Net book value   $ 146,400,436     $ 165,942,542