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Derivative financial instruments - Additional information (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Disclosure of derivative financial instruments [Line Items] |  |  |
Unrealized gain (loss) before tax | $ (6,232,000) | $ 10,696,000 | $ 6,678,000
Hedge ineffectiveness | 0 | 454,000 | 1,403,000
Effect on settlement of hedging financial instruments | 0 | 818,000 | 1,547,000
Interest rate hedge |  |  |
Disclosure of derivative financial instruments [Line Items] |  |  |
Unrealized gain (loss) before tax | 644,000 | 1,991,000 |
Effect on settlement of hedging financial instruments | 818,000 | (1,547,000) |
Unrealized gain (loss) net of tax income | 454,000 | 1,403,000 |
Copper and Zinc prices hedge |  |  |
Disclosure of derivative financial instruments [Line Items] |  |  |
Unrealized gain (loss) before tax | 9,047,000 | 15,171,000 | 9,472,000
Unrealized gain (loss) net of tax income | 6,232,000 | 10,696,000 | 6,678,000
Other reserves [member] | Copper and Zinc prices hedge |  |  |
Disclosure of derivative financial instruments [Line Items] |  |  |
Hedge operations gain loss | $ 6,056,000 | $ 12,774,000 | $ (51,952,000)

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- Definition The amount of other comprehensive income, before tax, after reclassification adjustments, related to cash flow hedges. [Refer: Cash flow hedges [member]; Other comprehensive income, before tax] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 91 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_91_b&doctype=Standard -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 7 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_7&doctype=Standard -URIDate 2024-03-27 + Details
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