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PROPERTY, PLANT AND EQUIPMENT, NET (Tables)
6 Months Ended
Jun. 30, 2021
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment, Net - Schedule of Property, Plant and Equipment

Property, plant and equipment, net consist of the following:

 

   June 30,
2021
  December 31,
2020
At cost:          
Mineral rights  $2,985,480   $2,955,780 
Buildings   64,668,005    64,024,667 
Plant and machinery   260,997,193    258,400,710 
Motor vehicles   31,724    6,553 
Furniture, fixtures and office equipment   3,353,441    3,318,564 
Construction in process   23,271,504    12,095,565 
Total   355,307,347    340,801,839 
Less: Accumulated depreciation and amortization   (183,189,944)   (173,212,554)
     Impairment   (18,828,910)   (18,641,596)
Net book value  $153,288,493   $148,947,689