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Inventories
 12 Months Ended
Dec. 31, 2017
Statement [Line Items]  
Inventories [text block]
8.

Inventories


      Dec. 31, 2017     Dec. 31, 2016  
  Current            
  Stockpile $ 13,468   $ 9,368  
  Work in progress 1   14,552     9,100  
  Finished goods   71,906     54,583  
  Materials and supplies   41,756     39,413  
      141,682     112,464  
  Non-current            
  Materials and supplies   5,809     4,537  
               
    $ 147,491     117,001  

1 Represents zinc concentrate which will be processed further into cast zinc metal or sold directly.

The cost of inventories recognized as an expense, including depreciation, and included in cost of sales amounted to $855,141 for the year ended December 31, 2017 (year ended December 31, 2016 - $803,802).