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Acquisitions and Other Transactions - Acquisition of Additional Royalty and Private Placement (Details) $ / shares in Units, $ in Millions, $ in Millions |  |  |  |  |  |  |  | 12 Months Ended |
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Jul. 26, 2023 USD ($) shares | Jul. 26, 2023 CAD ($) $ / shares shares | Jun. 08, 2023 USD ($) | May 07, 2023 USD ($) shares | May 07, 2023 CAD ($) $ / shares shares | Apr. 14, 2023 USD ($) | Feb. 22, 2023 | Jun. 08, 2019 | Feb. 19, 2019 USD ($) | Dec. 31, 2023 | Feb. 19, 2019 CAD ($)
Acquisitions |  |  |  |  |  |  |  |  |  |  |
Percentage of NSR |  |  |  |  |  |  | 1.50% |  | 2.00% |  |
Buy back percentage of net smelter return |  |  |  |  |  |  |  | 0.50% |  |  |
Marathon Gold Corporation, Valentine Gold Project Acquisition |  |  |  |  |  |  |  |  |  |  |
Acquisitions |  |  |  |  |  |  |  |  |  |  |
Additional NSR acquired |  |  | 1.50% |  |  |  |  |  |  |  |
Purchase price |  |  | $ 45.0 |  |  |  |  |  | $ 13.7 |  | $ 18.0
Percentage of NSR |  |  |  |  |  |  | 2.00% |  |  | 3.00% |
Number of shares acquired | shares |  |  |  | 6,578,947 | 6,578,947 |  |  |  |  |  |
Price per share | $ / shares |  |  |  |  | $ 0.76 |  |  |  |  |  |
Total cost of shares acquired |  |  |  | $ 3.8 | $ 5.0 |  |  |  |  |  |
Royalty on Kerr-Addison Property and Share Subscription with Gold Candle Ltd. - Ontario, Canada |  |  |  |  |  |  |  |  |  |  |
Acquisitions |  |  |  |  |  |  |  |  |  |  |
Purchase price | $ |  |  |  |  |  | $ 10.0 |  |  |  |  |
Percentage of NSR |  |  |  |  |  | 1.00% |  |  |  |  |
Number of shares acquired | shares | 5,454,546 | 5,454,546 |  |  |  |  |  |  |  |  |
Price per share | $ / shares |  | $ 1.1 |  |  |  |  |  |  |  |  |
Total cost of shares acquired | $ 4.6 | $ 6.0 |  |  |  |  |  |  |  |  |

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