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Inventories (Tables)
 9 Months Ended
Sep. 30, 2018
Classes of current inventories [abstract]  
Schedule of Inventories
 
  
September 30,
    
December 31,
  
 
  
2018
    
2017
  
 
            
Concentrates
  
$
1,230
    
$
1,391
  
Ore stockpiles
    
1,436
      
2,877
  
Spare parts and supplies
    
5,584
      
5,098
  
 
  
$
8,250
    
$
9,366