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5. PROPERTY, PLANT AND EQUIPMENT, NET (Tables)
6 Months Ended
Jun. 30, 2013
Property, Plant and Equipment [Abstract]  
Property, plant and equipment
   

June 30,

2013

   

December 31,

2012

 
At cost:            
Mineral rights   $ 6,443,763     $ 6,334,277  
Buildings     51,785,222       50,905,337  
Plant and machinery     168,992,691       166,121,329  
Motor vehicles     9,298       9,140  
Furniture, fixtures and office equipment     4,859,614       4,777,044  
Total     232,090,588       228,147,127  
Less: Accumulated depreciation and amortization     (76,972,730 )     (62,204,585 )
Net book value   $ 155,117,858     $ 165,942,542