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Investment in Associates - Additional Information (Details) - USD ($) |  | 2 Months Ended | 5 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jun. 05, 2020 | Dec. 31, 2020 | Oct. 29, 2020 | Jun. 05, 2020 | Dec. 31, 2020 | Dec. 31, 2019
Disclosure of associates [line items] |  |  |  |  |  |
Proceeds from issue of equity shares |  |  |  |  | $ 4,737,000 | $ 2,781,000
Warrant liability, representing in-substance ownership |  | $ 0 |  |  | 0 | (15,040,000)
Income (loss) in associate |  |  |  |  | 10,529,000 | $ 15,245,000
Maverix Metals Inc. [member] |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Common shares issued in connection with exercise of stock options (shares) | 8,250,000 |  |  |  |  |
Proceeds from exercise of warrants | $ 15,600,000 |  |  |  |  |
Warrant liability, representing in-substance ownership |  | $ (15,000,000.0) |  |  | (15,000,000.0) |
Proportion of ownership interest in associate |  | 17.00% | 18.00% | 26.00% |  | 26.00%
Deferred revenue |  | $ (13,300,000) |  |  | (13,300,000) | $ (12,500,000)
Gain on disposition of shares pursuant to Secondary Offering |  |  |  |  | 23,467,000 | 0
Dilution gains |  |  |  |  | 9,200,000 | 13,500,000
Income (loss) in associate |  |  |  |  | 1,369,000 | $ 1,765,000
Maverix Metals Inc. [member] | Exercise Price of $1.56 [Member] |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Common shares issued in connection with exercise of stock options (shares) | 5,000,000 |  |  |  |  |
Exercise price (in USD per share) | $ 1.56 |  |  | $ 1.56 |  |
Maverix Metals Inc. [member] | Exercise Price of $2.408 [Member] |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Common shares issued in connection with exercise of stock options (shares) | 3,250,000 |  |  |  |  |
Exercise price (in USD per share) | $ 2.408 |  |  | 2.408 |  |
Maverix Metals Inc. [member] | Secondary Offering [Member] |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Gain on disposition of shares pursuant to Secondary Offering |  |  |  |  | $ 23,500,000 |
La Colorada mine [member] | Maverix Metals Inc. [member] |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Agreements to sell future gold production, percent of production (percent) |  |  |  |  | 100.00% |
Agreements to sell future gold production, price per ounce (in USD per ounce) |  | 650 |  |  | 650 |
La Bolsa mine [member] | Maverix Metals Inc. [member] |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Agreements to sell future gold production, percent of production (percent) |  |  |  |  | 5.00% |
Agreements to sell future gold production, price per ounce (in USD per ounce) |  | 450 |  |  | 450 |
Ordinary shares [member] | Maverix Metals Inc. [member] |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Number of shares acquired (sold) | 8,250,000 |  |  |  |  |
Ordinary shares [member] | Maverix Metals Inc. [member] | Secondary Offering [Member] |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |
Number of shares acquired (sold) | (10,350,000) |  |  |  |  |
Sale of common shares, price per share | $ 4.40 |  |  | $ 4.40 |  |
Proceeds from issue of equity shares | $ 45,500,000 |  |  |  |  |
Underwriting fees, percentage of gross proceeds | 4.00% |  |  |  |  |
Underwriting fees paid | $ 1,900,000 |  |  |  |  |

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