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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, 2023 | Dec. 31, 2022
RECLAMATION AND CLOSURE COST OBLIGATIONS |  |
Beginning Balance | $ 121.2 | $ 160.2
Reclamation expenditures | (2.4) | (4.0)
Unwinding of discount | 3.6 | 3.2
Revisions to expected cash flows | (0.8) | (30.1)
Foreign exchange movement | 2.6 | (8.1)
Ending Balance | 124.2 | 121.2
Less: current portion of closure costs | (0.8) | (1.7)
Non-current portion of closure costs | 123.4 | 119.5
Rainy River |  |
RECLAMATION AND CLOSURE COST OBLIGATIONS |  |
Beginning Balance | 87.6 | 109.4
Reclamation expenditures | (0.5) | (1.7)
Unwinding of discount | 2.7 | 2.3
Revisions to expected cash flows | (0.8) | (16.6)
Foreign exchange movement | 2.0 | (5.8)
Ending Balance | 91.0 | 87.6
Less: current portion of closure costs | (0.8) | (0.4)
Non-current portion of closure costs | 90.2 | 87.2
New Afton |  |
RECLAMATION AND CLOSURE COST OBLIGATIONS |  |
Beginning Balance | 32.3 | 49.3
Reclamation expenditures | 0.0 | 0.0
Unwinding of discount | 0.9 | 0.9
Revisions to expected cash flows | (0.8) | (15.6)
Foreign exchange movement | 0.7 | (2.3)
Ending Balance | 33.1 | 32.3
Less: current portion of closure costs | 0.0 | 0.0
Non-current portion of closure costs | 33.1 | 32.3
Cerro San Pedro |  |
RECLAMATION AND CLOSURE COST OBLIGATIONS |  |
Beginning Balance | 1.3 | 1.5
Reclamation expenditures | (1.9) | (2.3)
Unwinding of discount | 0.0 | 0.0
Revisions to expected cash flows | 0.8 | 2.1
Foreign exchange movement | (0.1) | 0.0
Ending Balance | 0.1 | 1.3
Less: current portion of closure costs | 0.0 | (1.3)
Non-current portion of closure costs | $ 0.1 | $ 0.0

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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 2023-01-01 -Section D Examples: disclosures -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=37&code=ifrs-tx-2023-en-r&doctype=Illustrative%20Examples&dita_xref=IAS37_IE_D_TI -URIDate 2023-03-23 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 37 -IssueDate 2023-01-01 -Paragraph 87 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=37&code=ifrs-tx-2023-en-r&anchor=para_87&doctype=Standard -URIDate 2023-03-23 + 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 2023-01-01 -Section D Examples: disclosures -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=37&code=ifrs-tx-2023-en-r&doctype=Illustrative%20Examples&dita_xref=IAS37_IE_D_TI -URIDate 2023-03-23 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 37 -IssueDate 2023-01-01 -Paragraph 87 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=37&code=ifrs-tx-2023-en-r&anchor=para_87&doctype=Standard -URIDate 2023-03-23 + Details
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