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14. INCOME TAXES (Tables)
3 Months Ended
Mar. 31, 2019
Income Tax Disclosure [Abstract]  
Schedule of components of the provision for income taxes
    Three-Month Period Ended March31,
    2019   2018
         
Current taxes – PRC   $     $  
Deferred tax – PRC     (1,395,137 )     (1,193,746 )
    $ (1,395,137 )   $ (1,193,746 )
Schedule of income tax expenses reconciliation
    Three-Month Period Ended March 31,
Reconciliations   2019   2018
Statutory income tax rate     25 %     25 %
Non-deductible expense and change in valuation allowance     (3 %)     (10 %)
Effective tax rate     22 %     15 %
Schedule of deferred tax assets and liabilities
    March 31,   December 31,
    2019   2018
Deferred tax liabilities   $     $  
                 
Deferred tax assets:                
Allowance for obsolete and slow-moving inventories   $ 16,607     $ 16,292  
Impairment on property, plant and equipment     3,675,218       3,696,332  
Impairment on prepaid land lease     856,490       840,284  
Exploration costs     1,848,950       1,813,965  
Compensation costs of unexercised stock options     179,957       194,016  
PRC tax losses     14,398,399       12,663,985  
US federal net operating loss     148,000       119,000  
Total deferred tax assets     21,123,621       19,343,874  
Valuation allowance     (327,957 )     (313,016 )
Net deferred tax asset   $ 20,795,664     $ 19,030,858