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5. PROPERTY, PLANT AND EQUIPMENT, NET (Tables)
3 Months Ended
Mar. 31, 2014
Property, Plant and Equipment [Abstract]  
Property, plant and equipment
   

March 31,

2014

   

December 31,

2013

 
At cost:            
Mineral rights   $ 6,471,632     $ 6,530,158  
Buildings     52,865,338       53,343,419  
Plant and machinery     171,332,909       172,842,611  
Motor vehicles     9,339       9,423  
Furniture, fixtures and office equipment     4,858,688       4,902,627  
Total     235,537,906       237,628,238  
Less: Accumulated depreciation and amortization     (97,221,803 )     (91,227,802 )
Net book value   $ 138,316,103     $ 146,400,436