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Mining interests and plant and equipment (Tables)
 12 Months Ended
Dec. 31, 2021
Disclosure of detailed information about property, plant and equipment [abstract]  
Disclosure of detailed information about mining interests and plant and equipment [Table Text Block]
                2021                 2020  
    Mining     Plant and           Mining     Plant and        
    interests     equipment (i)     Total     interests     equipment (i)     Total  
    $     $     $     $     $     $  
Net book value - January 1   459,303     30,209     489,512     320,008     23,685     343,693  
Acquisition of the San Antonio gold                                    
project (Note 6)   -     -     -     57,038     1,330     58,368  
Additions   139,183     58,192     197,375     75,437     10,915     86,352  
Impairment   (58,417 )   -     (58,417 )   -     -     -  
Mining exploration tax credits   (1,585 )   -     (1,585 )   (4,608 )   -     (4,608 )
Change in environmental                                    
rehabilitation assets   19,522     -     19,522     3,414     -     3,414  
Depreciation   -     (7,814 )   (7,814 )   -     (5,340 )   (5,340 )
Depreciation capitalized   4,136     -     4,136     4,019     -     4,019  
Share-based compensation capitalized   2,127     -     2,127     688     -     688  
Transfers   (11,221 )   11,221     -     -     -     -  
Pre-commercial revenues   (7,275 )   -     (7,275 )   -     -     -  
Disposals and others   -     (213 )   (213 )   -     (388 )   (388 )
Currency translation adjustments   (1,820 )   107     (1,713 )   3,307     7     3,314  
Net book value - December 31   543,953     91,702     635,655     459,303     30,209     489,512  
                                     
Closing balance                                    
Cost   602,370     105,112     707,482     459,303     37,545     496,848  
Accumulated depreciation                                    
and impairment   (58,417 )   (13,410 )   (71,827 )   -     (7,336 )   (7,336 )
Net book value   543,953     91,702     635,655     459,303     30,209     489,512  

(i) Plant and equipment includes right-of-use assets of $20.3 million as at December 31, 2021 ($10.8 million as at December 31, 2020).