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Share capital - Summary of share capital (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Number of Shares |  |
Shares issued upon exercise of share options, for cash (in shares) | 618,915 | 56,644
Shares issued to the public (in shares) | 8,353,042 | 6,104,958
Flow-through shares issued, net of costs and premium (in shares) | 996,100 |
Total |  |
Balance beginning of year | $ 3,473,813 |
Balance end of year | $ 3,656,450 | $ 3,473,813
Voting common shares |  |
Number of Shares |  |
Beginning balance (in shares) | 164,963,324 | 158,801,722
Ending balance (in shares) | 174,931,381 | 164,963,324
Share capital |  |
Total |  |
Balance beginning of year | $ 3,054,563 | $ 3,007,924
Shares issued upon exercise of share options, for cash | 3,559 | 265
Estimated fair value of share options exercised transferred from contributed surplus | 1,267 | 103
Increase (decrease) through shares issued to the public, net of share issuance costs | 76,957 | 48,041
Share issuance cost | (1,570) | (1,770)
Flow-through shares issued, net of costs and premium | 9,868 |
Balance end of year | $ 3,144,644 | $ 3,054,563

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