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Share Capital (Tables) | 12 Months Ended
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Dec. 31, 2018
Disclosure of share capital, reserves and other equity interest [Abstract] |
Schedule of Common Stock Outstanding Roll Forward |
| Number of Shares | Amount
Outstanding at December 31, 2016 | 267,076,495 |  | $2,822.2 |
Shares issued through: |  |  |
Acquisition of Richmont Mines Ltd (note 5) | 88,398,804 |  | 615.3 |
Equity financing (i) | 31,450,000 |  | 241.8 |
Share-based compensation plans | 542,250 |  | 3.5 |
Exercise of warrants | 332,466 |  | 0.5 |
Flow-through share financing | 1,301,535 |  | 8.4 |
Outstanding at December 31, 2017 | 389,101,550 |  | $3,691.7 |
Shares issued through: |  |
Share-based compensation plans | 1,984,698 |  | 12.9 |
Exercise of warrants | 163,955 |  | 0.6 |
Outstanding at December 31, 2018 | 391,250,203 |  | $3,705.2 |
Disclosure of number and weighted average exercise prices of share options | The following is a continuity of the changes in the number of stock options outstanding:
| Number | Weighted average exercise price (CAD$)
Outstanding at December 31, 2016 | 9,511,636 |  | $10.87 |
Granted | 578,490 |  | 9.62 |
Conversion of Richmont options to Alamos options (note 5) | 2,863,146 |  | 3.53 |
Exercised | (510,673 | ) | 6.23 |
Expired | (2,013,254 | ) | 16.42 |
Outstanding at December 31, 2017 | 10,429,345 |  | $7.94 |
Granted | 1,009,100 |  | 6.56 |
Exercised | (1,984,698 | ) | 2.40 |
Expired | (2,798,292 | ) | 12.70 |
Outstanding at December 31, 2018 | 6,655,455 |  | $7.38 |
Weighted average fair value assumptions used in the Black-Scholes valuation for stock options | The following table presents the weighted average fair value assumptions used in the Black-Scholes valuation:
For options granted in the year ended: | December 31, 2018 | December 31, 2017
Weighted average share price at grant date (CAD$) | $6.56 |  | $9.62 |
Risk-free rate | 1.88% - 2.06% |  | 0.91% - 1.35% |
Expected dividend yield | 0.70 | % | 0.70 | %
Expected stock price volatility (based on historical volatility) | 57 | % | 57 | %
Expected life of option (months) | 42 - 84 |  | 36 - 84 |
Weighted average per share fair value of stock options granted (CAD$) | $3.11 |  | $4.27 |
Disclosure of number and weighted average remaining contractual life of outstanding share options | Stock options outstanding and exercisable as at December 31, 2018:
|  | Outstanding |  | Exercisable
Range of exercise prices (CAD$) |  | Number of options | Weighted average exercise price (CAD$) | Weighted average remaining contractual life (years) |  | Number of options | Weighted average exercise price (CAD$)
$0.82 - $3.00 |  | 213,108 |  | 2.67 |  | 0.04 |  |  | 213,108 |  | 2.67 |
$3.01 - $7.00 |  | 2,668,070 |  | 4.97 |  | 4.52 |  |  | 1,136,011 |  | 4.18 |
$7.01 - $11.00 |  | 3,159,640 |  | 8.24 |  | 1.66 |  |  | 2,773,982 |  | 8.05 |
$11.01 - $15.00 |  | 249,777 |  | 13.15 |  | 0.67 |  |  | 249,777 |  | 13.15 |
$15.01 - $19.00 |  | 364,860 |  | 16.42 |  | 0.56 |  |  | 364,860 |  | 16.42 |
|  | 6,655,455 |  | $7.38 |  | 2.65 |  |  | 4,737,738 |  | $7.79 |
Stock options outstanding and exercisable by range of exercise prices | Stock options outstanding and exercisable as at December 31, 2018:
|  | Outstanding |  | Exercisable
Range of exercise prices (CAD$) |  | Number of options | Weighted average exercise price (CAD$) | Weighted average remaining contractual life (years) |  | Number of options | Weighted average exercise price (CAD$)
$0.82 - $3.00 |  | 213,108 |  | 2.67 |  | 0.04 |  |  | 213,108 |  | 2.67 |
$3.01 - $7.00 |  | 2,668,070 |  | 4.97 |  | 4.52 |  |  | 1,136,011 |  | 4.18 |
$7.01 - $11.00 |  | 3,159,640 |  | 8.24 |  | 1.66 |  |  | 2,773,982 |  | 8.05 |
$11.01 - $15.00 |  | 249,777 |  | 13.15 |  | 0.67 |  |  | 249,777 |  | 13.15 |
$15.01 - $19.00 |  | 364,860 |  | 16.42 |  | 0.56 |  |  | 364,860 |  | 16.42 |
|  | 6,655,455 |  | $7.38 |  | 2.65 |  |  | 4,737,738 |  | $7.79 |
Continuity of the changes in the number of other long-term incentive plans (LTIP) outstanding | The following is a continuity of the changes in the number of other long-term incentive plans ("LTI") outstanding for the years ended December 31, 2018 and 2017:
| Restricted share units ("RSU") | Stock appreciation rights ("SAR") | Deferred share units ("DSU") | Performance share units ("PSU")
Outstanding units, December 31, 2016 | 1,410,192 |  | 1,489,575 |  | 378,345 |  | 424,253 |
Granted | 499,560 |  | — |  | 102,260 |  | 269,780 |
Conversion of Richmont units to Alamos units (note 5) | 112,774 |  | — |  | — |  | — |
Forfeited | (171,452 | ) | (316,074 | ) | — |  | (65,451 | )
Settled | (350,140 | ) | (117,976 | ) | — |  | (28,877 | )
Outstanding units, December 31, 2017 | 1,500,934 |  | 1,055,525 |  | 480,605 |  | 599,705 |
Granted | 611,717 |  | — |  | 164,808 |  | 440,420 |
Forfeited | (99,939 | ) | (482,533 | ) | — |  | (56,684 | )
Settled | (445,016 | ) | (63,800 | ) | — |  | — |
Outstanding units, December 31, 2018 | 1,567,696 |  | 509,192 |  | 645,413 |  | 983,441 |
Schedule of Earnings (loss) per share |
| For the years ended December 31,
| 2018 | 2017
Net (loss) earnings | ($72.6 | ) | $26.6 |
Weighted average number of common shares outstanding (in thousands) | 389,816 |  | 305,521 |
Basic (loss) earnings per share |  | ($0.19 | ) |  | $0.09 |
Dilutive effect of potential common share equivalents (in thousands) | — |  | 3,500 |
Diluted weighted average number of common shares outstanding (in thousands) | 389,816 |  | 309,021 |
Diluted (loss) earnings per share |  | ($0.19 | ) |  | $0.09 |
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share | For the periods in which the Company records a loss, diluted loss per share is calculated using the basic weighted average number of shares outstanding, as using the diluted weighted average number of shares outstanding in the calculation would be anti-dilutive.
| For the years ended December 31,
(in thousands) | 2018 | 2017
Stock options | 6,655 |  | 2,920 |
Warrants | 5,215 |  | 12,232 |
| 11,870 |  | 15,152 |
Schedule of Share Purchase Warrants | The Company has the following share purchase warrants ("Warrants"), outstanding as at December 31, 2018 related to past acquisitions:
| Number of warrants |  | Common shares issuable |  | Exercise price |  | Expiry date
| (000s) |  | (000s) |  | CAD |  |
AGI.WT.A | 5,215 |  | 5,215 |  | $10.00 |  | January 7, 2019
| 5,215 |  | 5,215 |  |  |

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