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4. PROPERTY, PLANT AND EQUIPMENT, NET (Tables)
9 Months Ended
Sep. 30, 2017
Property, Plant and Equipment [Abstract]  
Property, plant and equipment
    September 30, 2017   December 31, 2016
At cost:            
Mineral rights   $ 4,638,854     $ 4,438,115  
Buildings     66,796,949       63,601,451  
Plant and machinery     191,789,494       183,243,077  
Motor vehicles     8,656       8,282  
Furniture, fixtures and office equipment     4,086,312       3,909,483  
Construction in process     -       374,790  
Total     267,320,265       255,575,198  
Less: Accumulated depreciation and amortization     (169,696,997 )     (146,844,072 )
Net book value   $ 97,623,268     $ 108,731,126