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Share capital (Tables) | 12 Months Ended
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Dec. 31, 2020
Disclosure Of Classes Of Share Capital [Abstract] |
Common shares issued |
Number issued (number of shares) | 2020 | 2019
Beginning of year | 395,797,732 | 395,792,732
Issued: |  |
| Stock option plan [note 24] | 465,009 | 5,000
End of year | 396,262,741 | 395,797,732

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