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Non-current derivative financial liabilities - Narrative (Details) oz in Thousands, $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 USD ($) | Dec. 31, 2015 USD ($) oz | Dec. 31, 2023
Rainy River |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Transaction price allocated to remaining performance obligations | $ |  | $ 175.0 |
Gold stream obligation, rate of gold production to be delivered for initial threshold |  | 6.50% |
Gold stream obligation initial threshold quantity (in ounces) | oz |  | 230 |
Gold stream obligation rate of gold production to be delivered after initial threshold |  | 3.25% |
Gold stream obligation, rate of silver production to be delivered for initial threshold |  | 60.00% |
Gold stream obligation, silver production, initial threshold quantity (in ounces) | oz |  | 3,100 |
Gold stream obligation, rate of silver production to be delivered after initial threshold |  | 30.00% |
Average spot rate of gold or silver |  | 25.00% |
Term of the agreement |  | 40 years |
Ontario Teachers' Pension Plan | New Afton |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Term of the agreement | 4 years |  |
Free cash flow interest | 46.00% |  | 46.00%
Proceeds received | $ | $ 300.0 |  |
Conversion of free cash flow interest into joint venture interest | 46.00% |  |
Free cash flow interest conversion term | 4 years |  |
Future free cash flow interest reduced | 42.50% |  |

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