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5. PROPERTY, PLANT AND EQUIPMENT, NET (Tables)
6 Months Ended
Jun. 30, 2016
Property, Plant and Equipment [Abstract]  
Property, plant and equipment
   

June 30,

2016

   

December 31,

2015

 
At cost:            
Mineral rights   $ 6,003,828     $ 6,131,230  
Buildings     67,199,375       68,510,164  
Plant and machinery     191,237,780       195,295,877  
Motor vehicles     8,664       8,847  
Furniture, fixtures and office equipment     4,763,536       4,864,619  
Construction in process     422,139       57,596  
Total     269,635,322       274,868,333  
Less: Accumulated depreciation and amortization     (157,086,213 )     (146,997,010 )
Net book value   $ 112,549,109     $ 127,871,323