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Mining interests and plant and equipment - Disclosure of detailed information about mining interests and plant and equipment (Details) - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Disclosure of detailed information about property, plant and equipment and Mining interests [line items]    
Beginning balance $ 489,512 $ 343,693
Acquisition of the San Antonio gold project 0 58,368
Additions 197,375 86,352
Impairment (58,417) 0
Mining exploration tax credits (1,585) (4,608)
Change in environmental rehabilitation assets 19,522 3,414
Depreciation (7,814) (5,340)
Depreciation capitalized 4,136 4,019
Share-based compensation capitalized 2,127 688
Transfers 0 0
Pre-commercial revenues (7,275) 0
Disposals and others (213) (388)
Currency translation adjustments (1,713) 3,314
Closing balance 635,655 489,512
Cost [Member]    
Disclosure of detailed information about property, plant and equipment and Mining interests [line items]    
Beginning balance 496,848  
Closing balance 707,482 496,848
Accumulated depreciation [Member]    
Disclosure of detailed information about property, plant and equipment and Mining interests [line items]    
Beginning balance (7,336)  
Closing balance (71,827) (7,336)
Mining interests [Member]    
Disclosure of detailed information about property, plant and equipment and Mining interests [line items]    
Beginning balance 459,303 320,008
Acquisition of the San Antonio gold project 0 57,038
Additions 139,183 75,437
Impairment (58,417) 0
Mining exploration tax credits (1,585) (4,608)
Change in environmental rehabilitation assets 19,522 3,414
Depreciation 0 0
Depreciation capitalized 4,136 4,019
Share-based compensation capitalized 2,127 688
Transfers (11,221) 0
Pre-commercial revenues (7,275) 0
Disposals and others 0 0
Currency translation adjustments (1,820) 3,307
Closing balance 543,953 459,303
Mining interests [Member] | Cost [Member]    
Disclosure of detailed information about property, plant and equipment and Mining interests [line items]    
Beginning balance 459,303  
Closing balance 602,370 459,303
Mining interests [Member] | Accumulated depreciation [Member]    
Disclosure of detailed information about property, plant and equipment and Mining interests [line items]    
Beginning balance 0  
Closing balance (58,417) 0
Plant and equipment [Member]    
Disclosure of detailed information about property, plant and equipment and Mining interests [line items]    
Beginning balance 30,209 23,685
Acquisition of the San Antonio gold project 0 1,330
Additions 58,192 10,915
Impairment 0 0
Mining exploration tax credits 0 0
Change in environmental rehabilitation assets 0 0
Depreciation (7,814) (5,340)
Depreciation capitalized 0 0
Share-based compensation capitalized 0 0
Transfers 11,221 0
Pre-commercial revenues 0 0
Disposals and others (213) (388)
Currency translation adjustments 107 7
Closing balance 91,702 30,209
Plant and equipment [Member] | Cost [Member]    
Disclosure of detailed information about property, plant and equipment and Mining interests [line items]    
Beginning balance 37,545  
Closing balance 105,112 37,545
Plant and equipment [Member] | Accumulated depreciation [Member]    
Disclosure of detailed information about property, plant and equipment and Mining interests [line items]    
Beginning balance (7,336)  
Closing balance $ (13,410) $ (7,336)