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Production costs by nature (Tables)
12 Months Ended
Dec. 31, 2021
Analysis of income and expense [abstract]  
Disclosure of components of cost of sales
                             
    2021   2020
    $   $
         
Raw materials and consumables   408,219      310,067   
Salaries and employee benefits   120,690      112,124   
Contractors   32,926      37,183   
Equipment rental   3,752      10,266   
Other   37,207      26,929   
Change in inventories   (15,986)     (5,707)  
Capitalized to mining interests   (93,419)     (82,997)  
    493,389      407,865