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5. PROPERTY, PLANT AND EQUIPMENT, NET (Tables)
9 Months Ended
Sep. 30, 2016
Property, Plant and Equipment [Abstract]  
Property, plant and equipment
    September 30, 2016   December 31, 2015
At cost:            
Mineral rights   $ 5,962,024     $ 6,131,230  
Buildings     67,954,932       68,510,164  
Plant and machinery     203,242,535       195,295,877  
Motor vehicles     8,603       8,847  
Furniture, fixtures and office equipment     4,730,368       4,864,619  
Construction in process     172,925       57,596  
Total     282,071,387       274,868,333  
Less: Accumulated depreciation and amortization     (159,646,621 )     (146,997,010 )
Net book value   $ 122,424,766     $ 127,871,323