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14. INCOME TAXES (Tables)
6 Months Ended
Jun. 30, 2020
Income Tax Disclosure [Abstract]  
Components of the provision for income taxes
    Three-Month Period Ended June 30,   Six-Month Period Ended June 30,
    2020   2019   2020   2019
Current taxes – PRC   $     $     $     $  
Deferred taxes – PRC     612,354       695,988       1,739,929       2,106,066  
Change in valuation allowance     60,279       (330,005 )     189,147       (344,946 )
    $ 672,633     $ 365,983     $ 1,929,076     $ 1,761,120  
Income tax expenses reconciliation
    Three-Month Period Ended June 30,   Six-Month Period Ended June 30,
Reconciliations   2020   2019   2020   2019
Statutory income tax rate     25 %     25 %     25 %     25 %
Non-taxable income,(Non-deductible expense) and change in valuation allowance     (2 %)     8 %           (1 %)
Effective tax rate     23 %     33 %     25 %     24 %
Deferred tax assets and liabilities
    June 30,   December 31,
    2020   2019
Deferred tax liabilities   $     $  
                 
Deferred tax assets:                
Impairment on property, plant and equipment     2,764,893       2,974,542  
Impairment on prepaid land lease     814,620       826,673  
Exploration costs     1,758,563       1,784,583  
Compensation costs of unexercised stock options     74,883       171,672  
PRC tax losses     20,571,271       18,737,005  
US federal net operating loss     311,000       432,000  
Total deferred tax assets     26,295,230       24,926,475  
Valuation allowance     (8,796,686 )     (8,985,833 )
Net deferred tax asset   $ 17,498,544     $ 15,940,642