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Income taxes - Summary of change in net deferred tax position (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Net deferred income tax liability    
Deferred tax liability (asset) at end of period $ 410,219 $ 439,195
Deferred income tax (recovery) expense in the statement of operations (8,477) 47,899
Deferred tax assets from acquisition of QMX Gold Corporation 0 (14,122)
Deferred tax (recovery) expense related to discontinued operations (20,039) 1,897
Deferred tax impact on disposition of Tocantinzinho 0 (11,010)
Deferred tax recovery in the consolidated statement of other comprehensive income (460) (23)
Deferred tax liability (asset) at beginning of period $ 439,195 $ 414,554