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Income taxes (Tables)
9 Months Ended
Sep. 30, 2018
Income Taxes [abstract]  
Schedule of Components of Deferred Tax Liabilities
The Company’s net deferred tax liability relates to the Mexican mining royalty and arises principally from the following:

 
 
September 30,
   
December 31,
 
 
 
2018
   
2017
 
 
           
Property, plant and equipment
 
$
837
   
$
900
 
Other
   
25
     
-
 
Total deferred tax liabilities
   
862
     
900
 
 
               
Alternative minimum tax credits
   
626
     
626
 
Other
   
-
     
28
 
Total deferred tax assets
   
626
     
654
 
Net deferred tax liabilities
 
$
236
   
$
246