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14. INCOME TAXES (Tables)
12 Months Ended
Dec. 31, 2016
Income Tax Disclosure [Abstract]  
Schedule of components of the provision for income taxes
   Years ended December 31,
   2016  2015
       
Current taxes – PRC  $11,807,194   $11,455,764 
Deferred tax – PRC   3,013    (83,856)
   $11,810,207   $11,371,908 
           
Schedule of income tax expenses reconciliation
      Years ended December 31,
      2016  2015
          
Statutory income tax rate        25%   25%
Non-deductible items        (1%)   (1%)
Change in valuation allowance-US federal net operating loss        1%   1%
Effective tax rate        25%   25%
Schedule of deferred tax assets and liabilities
   As of December 31,
   2016  2015
Deferred tax liabilities  $—     $—   
           
Deferred tax assets:          
Allowance for obsolete and slow-moving inventories  $—     $3,173 
Impairment on property, plant and equipment   421,106    449,879 
Exploration costs   1,794,667    1,917,301 
Compensation costs of unexercised stock options   120,986    629,162 
US federal net operating loss   11,575,000    10,835,000 
Total deferred tax assets   13,911,759    13,834,515 
Valuation allowance   (11,695,986)   (11,464,162)
Net deferred tax asset  $2,215,773   $2,370,353 
           
Current deferred tax asset  $—     $3,173 
Long-term deferred tax asset  $2,215,773   $2,367,180