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4. PROPERTY, PLANT AND EQUIPMENT, NET (Tables)
9 Months Ended
Sep. 30, 2018
Property, Plant and Equipment [Abstract]  
Property, plant and equipment
    September 30,
2018
  December 31,
2017
At cost:                
Mineral rights   $ 4,475,677       4,711,822  
Buildings     60,728,604       67,748,512  
Plant and machinery     147,580,728       200,742,652  
Motor vehicles     6,216       8,792  
Furniture, fixtures and office equipment     3,281,560       4,150,588  
Construction in process     1,306,671       183,036  
Total     217,379,456       277,545,402  
Less: Accumulated depreciation and amortization     (131,560,339 )     (163,597,407 )
Impairment     (18,951,023 )     (18,833,491 )
Net book value   $ 66,868,094     $ 95,114,504