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12. INCOME TAXES (Tables)
9 Months Ended
Sep. 30, 2018
Income Tax Disclosure [Abstract]  
Schedule of components of the provision for income taxes
    Three-Month Period
Ended September 30,
  Nine-Month Period
Ended September 30,
    2018   2017   2018   2017
Current taxes – PRC   $     $ 1,509,321     $     $ 9,152,597  
Deferred taxes – PRC     (7,181,521 )           (10,258,508 )      
    $ (7,181,521 )   $ 1,509,321     $ (10,258,508 )   $ 9,152,597  
Schedule of income tax expenses reconciliation
    Three-Month Period
Ended September 30,
  Nine-Month Period
Ended September 30,
Reconciliations   2018   2017   2018   2017
Statutory income tax rate     (25 %)     25 %     (25 %)     25 %
Non-deductible Non-taxable item     (2 %)     3 %           1 %
Change in valuation allowance - US federal net operating loss           3 %           1 %
Effective tax rate     (27 %)     31 %     (25 %)     27 %
Schedule of deferred tax assets and liabilities
    September 30,   December 31,
    2018   2017
Deferred tax liabilities   $     $  
                 
Deferred tax assets:                
Allowance for obsolete and slow-moving inventories   $     $ 10,980  
Impairment on property, plant and equipment     3,773,740       4,610,228  
Exploration costs     1,809,857       1,905,347  
Compensation costs of unexercised stock options     94,287       98,092  
PRC tax losses     10,559,743        
US federal net operating loss     83,400        
Total deferred tax assets     16,321,027       6,624,647  
Valuation allowance     (177,687 )     (98,092 )
Net deferred tax asset   $ 16,143,340     $ 6,526,555