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13. Income Taxes (Tables)
12 Months Ended
Dec. 31, 2017
Income Taxes Tables  
Domestic and foreign components of income (loss) from operations before income taxes
    2017     2016  
Domestic   $ (374,478 )   $ (263,652 )
Foreign     (759,916 )     (747,410 )
Total   $ (1,134,394 )   $ (1,011,062 )
Deferred tax assets
    2017     2016  
Deferred tax assets:            
Foreign exploration costs   $ 15,372     $ 47,011  
Foreign net operating loss carry forward     1,537,420       1,309,445  
Domestic net operating loss carry forward     443,100       465,145  
Other     1,455       -  
      Deferred tax assets     1,997,347       1,821,601  
                 
Valuation allowance (foreign)     (1,537,420 )     (1,309,445 )
Valuation allowance (domestic)     (316,793 )     (299,522 )
      Total deferred tax assets     143,134       212,634  
                 
Deferred tax liabilities:                
   Property, plant, and equipment     (143,134 )     (210,912 )
   Other     -       (1,722 )
      Total deferred tax liabilities     (143,134 )     (212,634 )
Net deferred tax assets   $ -     $ -  
Schedule of Components of Income Tax Expense (Benefit)
    2017     2016  
Tax benefit at federal statutory rate   $ (397,038 )   $ (353,872 )
State income tax effect     (34,609 )     (21,754 )
Foreign income tax effect     37,996       37,371  
Non-deductible items     930       3,263  
Percentage depletion     (58,056 )     (40,976 )
Change in valuation allowance - Domestic     229,462       151,745  
Change in valuation allowance - Foreign     227,975       224,223  
Impact on change in federal tax rate     (6,660 )     -  
Foreign tax assessment     -       285,048  
Alternative minimum tax - Domestic     -       13,090  
   Total   $ -     $ 298,138  
Schedule of Effective Income Tax Rate Reconciliation
    2017     2016  
Domestic            
Change in deferred tax asset for current year   $ (229,462 )   $ (151,745 )
Adjustment for prior year tax estimate to actual due to                
 transfer pricing adjustment for Mexican operations     212,146       (57,557 )
    $ (17,316 )   $ (209,302 )
Foreign                
Change in deferred tax asset for current year   $ (227,975 )   $ (224,223 )
Adjustment for impact of tax assessment     -       285,048  
Impact on change in foreign exchange rate     -       421,643  
Adjustment for prior year tax estimates to actual     -       724,041  
    $ (227,975 )   $ 1,206,509