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Share capital (Tables) | 12 Months Ended
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Dec. 31, 2021
Disclosure of classes of share capital [abstract] |
Schedule of common shares issued and outstanding | (a) No par value common shares issued
| Number of shares | Value of shares
(in millions of U.S. dollars, except where noted) | (000s) | $
NO PAR VALUE COMMON SHARES ISSUED |  |
Balance at December 31, 2019 | 675,957 |  | 3,144.5 |
Issuance of common shares under First Nations agreements | 350 |  | 0.7 |
Issuance of flow through shares(1) | 3,824 |  | 8.6 |
Exercise of options and vested performance share units | 119 |  | 0.2 |
Balance at December 31, 2020 | 680,250 |  | 3,154.0 |
Issuance of common shares under First Nations agreements | 250 |  | 0.4 |
Exercise of options and vested performance share units | 646 |  | 1.0 |
Balance at December 31, 2021 | 681,146 |  | 3,155.4 |
1.In December 2020, the Company closed a flow-through financing for proceeds of $10.2 million (gross proceeds less equity issuance costs) consisting of the issue and sale of 3,824,000 Common Shares at a price of C$3.40 per share to fund exploration drilling programs at Rainy River and New Afton.
Schedule of share-based payment arrangements | The following table summarizes share-based payment expenses:
|  | Year ended December 31
(in millions of U.S. dollars) |  |  | 2021 | 2020
SHARE-BASED PAYMENT EXPENSES |  |  |  |
Stock option expense |  |  | 1.1 |  | 0.8 |
Performance share unit expense |  |  | 1.6 |  | 1.4 |
Restricted share unit expense(1) |  |  | 1.4 |  | 8.4 |
Deferred share unit expense |  |  | (0.7) |  | 3.6 |
Shares issued under First Nations agreements(1) |  |  | (0.1) |  | 1.2 |
Total share-based payment expenses |  |  | 3.3 |  | 15.4 |
1. For the year ended December 31, 2021 $1.1 million of share based expenses were recognized in operating expenses (2020 – $7.8 million).
Schedule of number and weighted average exercise prices of share options | The following table presents changes in the Company’s stock option plan:
| Number of options | Weighted average exercise price
| (000s) | C$/share
CHANGES TO THE COMPANY'S STOCK OPTION PLAN |  |
Balance at December 31, 2019 | 5,578 |  | 2.81 |
Granted | 2,329 |  | 1.20 |
Exercised | (32) |  | 1.17 |
Forfeited | (677) |  | 4.06 |
Expired | (2,363) |  | 3.45 |
Balance at December 31, 2020 | 4,835 |  | 1.59 |
Granted | 1,708 |  | 2.06 |
Exercised | (203) |  | 1.18 |
Forfeited | (339) |  | 2.00 |
Expired | (245) |  | 4.82 |
Balance at December 31, 2021 | 5,756 |  | 1.58 |
Schedule of earnings per share | The following table sets out the calculation of earnings (loss) per share:
|  | Year ended December 31
(in millions of U.S. dollars, except where noted) |  |  | 2021 | 2020
CALCULATION OF EARNINGS (LOSS) PER SHARE |  |  |  |
Net earnings (loss) |  |  | 140.6 |  | (79.3) |
Basic weighted average number of shares outstanding (in millions) |  |  | 680.8 |  | 676.3 |
Dilution of securities: |  |  |  |
Stock options |  |  | 1.6 |  | — |
Diluted weighted average number of shares outstanding (in millions) |  |  | 682.4 |  | 676.3 |
Net earnings (loss) per share: |  |  |  |
Basic |  |  | 0.21 |  | (0.12) |
Diluted |  |  | 0.21 |  | (0.12) |
Schedule of antidilutive securities excluded from computation of earnings per share | The following table lists the equity securities excluded from the calculation of diluted earnings per share. All stock options are excluded from the calculation when the Company is in a net loss position.
|  | Year ended December 31
(in millions of units) |  |  | 2021 | 2020
EQUITY SECURITIES EXCLUDED FROM THE CALCULATION OF DILUTED EARNINGS PER SHARE |  |  |  |
Stock options |  |  | 1.9 |  | 4.8 |

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