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4. PROPERTY, PLANT AND EQUIPMENT, NET (Tables)
6 Months Ended
Jun. 30, 2014
Property, Plant and Equipment [Abstract]  
Property, plant and equipment
   

June 30,

2014

   

December 31,

2013

 
At cost:            
Mineral rights   $ 6,470,836     $ 6,530,158  
Buildings     52,858,833       53,343,419  
Plant and machinery     171,267,783       172,842,611  
Motor vehicles     9,337       9,423  
Furniture, fixtures and office equipment     4,858,090       4,902,627  
Total     235,464,879       237,628,238  
Less: Accumulated depreciation and amortization     (103,991,981 )     (91,227,802 )
Net book value   $ 131,472,898     $ 146,400,436