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Derivative financial instruments - Additional Information (Details) € in Thousands, $ in Thousands | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Oct. 31, 2023 EUR (€) € / $ | Aug. 31, 2023 EUR (€) € / $ | Apr. 30, 2023 EUR (€) $ / oz € / $ oz t $ / t | Dec. 31, 2023 USD ($) oz $ / t $ / oz | Dec. 31, 2023 EUR (€) oz $ / t $ / oz | May 31, 2023 oz
Euro forward contracts |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Derivative transaction, monthly recurring notional amount | € 2,500 | € 5,000 |  |  |  |
Derivative transaction, monthly recurring delivery rate | € / $ | 1.0785 | 1.1160 |  |  |  |
Gold collars |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Derivative transaction, monthly settlement quantity (in ounces) | oz |  |  |  |  |  | 16,667
Derivative transaction, quantity expired without financial settlement (in ounces) | oz |  |  |  | 116,669 | 116,669 |
Price per unit increase (decrease) that would impact earnings before tax | $ / oz |  |  | 200 |  |  |
Gold commodity swaps |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Derivative transaction, gold quantity (in ounces) | oz |  |  | 32,000 |  |  |
Price per unit increase (decrease) that would impact earnings before tax | $ / oz |  |  | 2,160 | 200 | 200 |
Copper commodity swaps |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Derivative transaction, copper quantity (in tonnes) | t |  |  | 6,160 |  |  |
Price per unit increase (decrease) that would impact earnings before tax | $ / t |  |  |  | 1,000 | 1,000 |
Copper forward price (usd per tonne) | $ / t |  |  | 8,525 |  |  |
Interest rate swaps |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Interest rate swap settlements in realized derivative cash gains | $ |  |  |  | $ 423 |  |
Interest rate swaps | Floating interest rate |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Derivative instrument, coverage percentage |  |  | 70.00% |  |  |
Interest rate swaps | Commercial Loan |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Borrowings, interest payment frequency |  |  | 6 months |  |  |
Interest rate swaps | Commercial Loan | Floating interest rate |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Derivative instrument, coverage percentage |  |  | 70.00% |  |  |
Interest rate swaps | Commercial Loan | Fixed interest rate |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Debt interest rate (as a percent) |  |  | 3.11% |  |  |
Foreign currency forward contracts | Commence on June 30, 2026 |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Derivative transaction, recurring delivery amount |  |  | € 17,000 |  |  |
Derivative transaction, recurring delivery occurrence period |  |  | 6 months |  |  |
Average forward rate (euro per usd) | € / $ |  |  | 1.1473 |  |  |
Foreign currency forward contracts | Commence on June 28, 2030 |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Derivative transaction, recurring delivery amount |  |  | € 11,350 |  |  |
Derivative transaction, recurring delivery occurrence period |  |  | 6 months |  |  |
Average forward rate (euro per usd) | $ / oz |  |  | 1.1704 |  |  |
Foreign currency collars | Canadian dollar |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Notional amount expired | $ |  |  |  | $ 96,000 |  |
Foreign currency collars | Euro |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Notional amount expired |  |  |  |  | € 75,400 |

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