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Other (expense) income and finance costs - Other income (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Analysis of income and expense [abstract]    
Interest income and other income $ 2,830 $ 1,310
Gain on disposal of mining licenses 7,296 0
Flow-through shares renouncement 3,702 0
Asset retirement obligation provision for closed facility (1,566) 0
Loss on disposal of assets (2,318) (4,631)
Other income $ 9,944 $ (3,321)