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5. PROPERTY, PLANT AND EQUIPMENT, NET (Tables)
6 Months Ended
Jun. 30, 2015
Property, Plant and Equipment [Abstract]  
Property, plant and equipment
   

June 30,

2015

   

December 31,

2014

 
At cost:            
Mineral rights   $ 6,512,242     $ 6,506,668  
Buildings     72,909,702       53,231,127  
Plant and machinery     186,178,788       177,485,689  
Motor vehicles     9,397       9,389  
Furniture, fixtures and office equipment     5,166,920       4,884,991  
Total     270,777,049       242,117,864  
Less: Accumulated depreciation and amortization     (143,126,756 )     (117,767,083 )
Net book value   $ 127,650,293     $ 124,350,781