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Production costs
 12 Months Ended
Dec. 31, 2017
Text block1 [abstract]  
Production costs
26. Production costs

 

     2017      2016  
     $      $  

Labour

      52,670        55,223  

Fuel

      23,241        22,405  

Reagents

      40,839        35,292  

Electricity

      12,132        13,991  

Mining contractors

      12,575        16,028  

Operating and maintenance supplies and services

      56,342        45,376  

Site general and administrative costs

      23,621        20,394  

Inventory change

      (36,501)        (19,510)  

Royalties, production taxes and selling expenses

      7,821        5,470  
                 192,740                    194,669