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5. PROPERTY, PLANT AND EQUIPMENT, NET (Tables)
3 Months Ended
Mar. 31, 2016
Property, Plant and Equipment [Abstract]  
Property, plant and equipment
   

March 31,

2016

   

December 31,

2015

 
At cost:            
Mineral rights   $ 6,161,886     $ 6,131,230  
Buildings     68,968,483       68,510,164  
Plant and machinery     196,272,356       195,295,877  
Motor vehicles     8,892       8,847  
Furniture, fixtures and office equipment     4,888,942       4,864,619  
Construction in process     -       57,596  
Total     276,300,559       274,868,333  
Less: Accumulated depreciation and amortization     (154,589,285 )     (146,997,010 )
Net book value   $ 121,711,274     $ 127,871,323