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Cost of sales
9 Months Ended
Sep. 30, 2018
Disclosure of cost of sales [abstract]  
Cost of sales
13.   Cost of sales
 
Cost of sales is costs that directly relate to production at the mine operating segments and excludes depletion and amortization. The following are components of cost of sales:

 
 
Three-month
   
Three-month
   
Nine-month
   
Nine-month
 
 
 
period ended
   
period ended
   
period ended
   
period ended
 
 
 
September 30,
   
September 30,
   
September 30,
   
September 30,
 
 
 
2018
   
2017
   
2018
   
2017
 
 
                       
Salaries and employee benefits
 
$
6,119
   
$
5,277
   
$
17,599
   
$
16,544
 
Raw materials and consumables
   
4,754
     
2,560
     
14,034
     
10,105
 
Utilities
   
1,237
     
772
     
3,246
     
3,006
 
Other costs
   
447
     
343
     
1,948
     
1,931
 
Changes in inventories
   
252
     
(1,258
)
   
1,116
     
(1,229
)
 
 
$
12,809
   
$
7,694
   
$
37,943
   
$
30,357