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12. INCOME TAXES (Tables)
6 Months Ended
Jun. 30, 2018
Income Tax Disclosure [Abstract]  
Schedule of components of the provision for income taxes
    Three-Month Period Ended June 30,   Six-Month Period Ended June 30,
    2018   2017   2018   2017
Current taxes – PRC   $     $ 4,821,450     $     $ 7,643,276  
Deferred taxes – PRC     (1,883,241 )           (3,076,987 )      
    $ (1,883,241 )   $ 4,821,450     $ (3,076,987 )   $ 7,643,276  
Schedule of income tax expenses reconciliation
  Three-Month Period Ended June 30,   Six-Month Period Ended June 30,
Reconciliations 2018   2017   2018   2017
Statutory income tax rate   25 %     25 %     25 %     25 %  
Non-deductible expense   (1 %)     1 %     (4 %)     1 %  
Non-taxable items   5 %     -       1 %     -    
Change in valuation allowance   (1 %)     -       (1 %)     -    
Effective tax rate   28 %     26 %     21 %     26 %  
Schedule of deferred tax assets and liabilities
    June 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     3,706,211       4,610,228  
Exploration costs     1,881,693       1,905,347  
Compensation costs of unexercised stock options     94,287       98,092  
PRC tax losses     3,820,948        
US federal net operating loss     7,138,700       7,080,000  
Total deferred tax assets     16,641,839       13,704,647  
Valuation allowance     (7,232,987 )     (7,178,092 )
Net deferred tax asset   $ 9,408,852     $ 6,526,555