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Inventories (Tables)
12 Months Ended
Dec. 31, 2017
Text block1 [abstract]  
Summary of Inventories
    

      December 31, 2017

$

    

    December 31, 2016

$

 

Ore stockpiles

     3,297        2,715  

In-process inventory and finished goods

     96,651        50,195  

Materials and supplies

     68,896        67,920   
     168,844        120,830