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Reclamation and closure cost obligations - Schedule of reclamation and closure cost obligations (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
RECLAMATION AND CLOSURE COST OBLIGATIONS |  |
Beginning Balance | $ 124.2 | $ 121.2
Reclamation expenditures | (0.5) | (2.4)
Unwinding of discount | 3.6 | 3.6
Revisions to expected cash flows | 1.9 | (0.8)
Foreign exchange movement | (9.8) | 2.6
Ending Balance | 119.4 | 124.2
Less: current portion of closure costs | (1.6) | (0.8)
Non-current portion of closure costs | 117.8 | 123.4
Rainy River |  |
RECLAMATION AND CLOSURE COST OBLIGATIONS |  |
Beginning Balance | 91.0 | 87.6
Reclamation expenditures | (0.4) | (0.5)
Unwinding of discount | 2.7 | 2.7
Revisions to expected cash flows | (1.2) | (0.8)
Foreign exchange movement | (7.1) | 2.0
Ending Balance | 85.0 | 91.0
Less: current portion of closure costs | (1.3) | (0.8)
Non-current portion of closure costs | 83.7 | 90.2
New Afton |  |
RECLAMATION AND CLOSURE COST OBLIGATIONS |  |
Beginning Balance | 33.1 | 32.3
Reclamation expenditures | 0.0 | 0.0
Unwinding of discount | 0.9 | 0.9
Revisions to expected cash flows | 3.1 | (0.8)
Foreign exchange movement | (2.7) | 0.7
Ending Balance | 34.4 | 33.1
Less: current portion of closure costs | (0.3) | 0.0
Non-current portion of closure costs | 34.1 | 33.1
Cerro San Pedro |  |
RECLAMATION AND CLOSURE COST OBLIGATIONS |  |
Beginning Balance | 0.1 | 1.3
Reclamation expenditures | (0.1) | (1.9)
Unwinding of discount | 0.0 | 0.0
Revisions to expected cash flows | 0.0 | 0.8
Foreign exchange movement | 0.0 | (0.1)
Ending Balance | 0.0 | 0.1
Less: current portion of closure costs | 0.0 | 0.0
Non-current portion of closure costs | $ 0.0 | $ 0.1

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- Definition The amount of non-current provision for decommissioning, restoration and rehabilitation costs. [Refer: Provision for decommissioning, restoration and rehabilitation costs] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 37 -IssueDate 2024-01-01 -Section D Examples: disclosures -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=37&code=ifrs-tx-2024-en-r&doctype=Illustrative%20Examples&dita_xref=IAS37_IE_D_TI -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 37 -IssueDate 2024-01-01 -Paragraph 87 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=37&code=ifrs-tx-2024-en-r&anchor=para_87&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The amount of provision for costs related to decommissioning, restoration and rehabilitation. [Refer: Other provisions] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 37 -IssueDate 2024-01-01 -Section D Examples: disclosures -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=37&code=ifrs-tx-2024-en-r&doctype=Illustrative%20Examples&dita_xref=IAS37_IE_D_TI -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 37 -IssueDate 2024-01-01 -Paragraph 87 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=37&code=ifrs-tx-2024-en-r&anchor=para_87&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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