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4. PROPERTY, PLANT AND EQUIPMENT, NET (Details) - USD ($)
9 Months Ended 12 Months Ended
Sep. 30, 2019
Dec. 31, 2018
Property, Plant and Equipment [Abstract]    
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 progress 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