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4. PROPERTY, PLANT AND EQUIPMENT, NET (Tables)
3 Months Ended
Mar. 31, 2017
Property, Plant and Equipment [Abstract]  
Property, plant and equipment
   

March 31,

2017

   

December 31,

2016

 
At cost:            
Mineral rights   $ 4,462,438     $ 4,438,115  
Buildings     62,300,940       61,656,398  
Plant and machinery     185,802,691       184,544,140  
Motor vehicles     8,327       8,282  
Furniture, fixtures and office equipment     4,578,428       4,553,473  
Construction in process     -       374,790  
Total     257,152,824       255,575,198  
Less: Accumulated depreciation and amortization     (152,998,604 )     (146,844,072 )
Net book value   $ 104,154,220     $ 108,731,126