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Share capital - Summary of share capital (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Number of Shares |  |
Shares issued upon exercise of share options, for cash (in shares) | 339,540 | 618,915
Shares issued on redemption of PSU's (in shares) | 514,010 |
Shares issued on acquisition of QMX (in shares) | 5,788,187 |
Shares issued to the public (in shares) |  | 8,353,042
Flow-through shares issued, net of costs and premium (in shares) | 1,100,000 | 996,100
Total |  |
Balance beginning of year | $ 3,687,045 |
Balance end of year | $ 3,639,922 | $ 3,687,045
Voting common shares |  |
Number of Shares |  |
Beginning balance (in shares) | 174,931,381 | 164,963,324
Ending balance (in shares) | 182,673,118 | 174,931,381
Share capital |  |
Total |  |
Balance beginning of year | $ 3,144,644 | $ 3,054,563
Shares issued upon exercise of share options, for cash | 1,738 | 3,559
Shares issued on redemption of PSU's | 1,202 | 0
Estimated fair value of share options exercised transferred from contributed surplus | 684 | 1,267
Shares issued on acquisition of QMX | 65,647 | 0
Shares issued to the public |  | 76,957
Share issuance cost |  | (1,570)
Flow-through shares issued, net of costs and premium | 11,411 | 9,868
Balance end of year | $ 3,225,326 | $ 3,144,644

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