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4. PROPERTY, PLANT AND EQUIPMENT, NET (Tables)
6 Months Ended
Jun. 30, 2019
Property, Plant and Equipment [Abstract]  
Property, plant and equipment
    June 30,
2019
  December 31,
2018
At cost:                
Mineral rights   $ 2,805,348     $ 2,809,977  
Buildings     60,766,201       60,866,462  
Plant and machinery     201,039,726       161,178,816  
Motor vehicles     6,219       6,230  
Furniture, fixtures and office equipment     3,283,592       3,289,010  
Construction in process     12,352,571       6,535,808  
Total     280,253,657       234,686,303  
Less: Accumulated depreciation and amortization     (141,263,815)       (134,681,628 )
     Impairment     (17,692,851)       (17,722,045 )
Net book value   $ 121,296,991     $ 82,282,630