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5. PROPERTY, PLANT AND EQUIPMENT, NET (Tables)
3 Months Ended
Mar. 31, 2015
Property, Plant and Equipment [Abstract]  
Property, plant and equipment
   

March 31,

2015

   

December 31,

2014

 
At cost:            
Mineral rights   $ 6,481,984     $ 6,506,668  
Buildings     72,570,939       53,231,127  
Plant and machinery     185,313,740       177,485,689  
Motor vehicles     9,354       9,389  
Furniture, fixtures and office equipment     5,142,913       4,884,991  
Total     269,518,930       242,117,864  
Less: Accumulated depreciation and amortization     (135,049,348 )     (117,767,083 )
Net book value   $ 134,469,582     $ 124,350,781