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14. INCOME TAXES (Tables)
6 Months Ended
Jun. 30, 2019
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,  
  2019   2018   2019   2018  
Current taxes – PRC   $ -     $ -     $ -     $ -  
Deferred taxes – PRC     (365,983)       (1,883,241)       (1,761,120)       (3,076,987 )
    $ (365,983)     $ (1,883,241)     $ (1,761,120)     $ (3,076,987 )
Schedule of income tax expenses reconciliation
  Three-Month Period Ended June 30,   Six-Month Period Ended June 30,
Reconciliations 2019   2018   2019   2018
Statutory income tax rate   25 %     25 %     25 %     25 %  
Non-taxable income,(Non-deductible expense) and change in valuation allowance     8 %     3 %     (1 %)     (4 %)  
Effective tax rate   33 %     28 %     24 %     21 %  
Schedule of deferred tax assets and liabilities
    June 30,     December 31,  
  2019     2018  
Deferred tax liabilities   $ -     $ -  
                 
Deferred tax assets:                
Allowance for obsolete and slow-moving inventories   $ -     $ 16,292  
Impairment on property, plant and equipment     3,525,701       3,696,332  
Impairment on prepaid land lease     838,671       840,284  
Exploration costs     1,810,977       1,813,965  
Compensation costs of unexercised stock options     171,672       194,016  
PRC tax losses     14,555,918       12,663,985  
US federal net operating loss     486,290       119,000  
Total deferred tax assets     21,389,229       19,343,874  
Valuation allowance     (657,962 )     (313,016 )
Net deferred tax asset   $ 20,731,267     $ 19,030,858