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4. PROPERTY, PLANT AND EQUIPMENT, NET (Tables)
9 Months Ended
Sep. 30, 2019
Property, Plant and Equipment [Abstract]  
Property, plant and equipment
    September 30,
2019
  December 31,
2018
At cost:                
Mineral rights   $ 2,726,661     $ 2,809,977  
Buildings     59,061,773       60,866,462  
Plant and machinery     231,460,194       161,178,816  
Motor vehicles     6,045       6,230  
Furniture, fixtures and office equipment     3,191,491       3,289,010  
Construction in process     1,188,268       6,535,808  
Total     297,634,432       234,686,303  
Less: Accumulated depreciation and amortization     (140,889,652)       (134,681,628 )
     Impairment     (17,196,587)       (17,722,045 )
Net book value   $ 139,548,193     $ 82,282,630