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Other income (expense) and finance costs - Other income (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Analysis of income and expense [abstract]    
Interest and other income $ 8,856 $ 2,742
Gain on disposal of mining licenses 0 7,296
Flow-through shares renouncement 0 3,702
Asset retirement obligation provision for closed facilities (13) (1,566)
Gain (loss) on disposal of assets 2,959 (815)
Other income $ 11,802 $ 11,359