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Reclamation and closure cost obligations - Schedule of reclamation and closure cost obligations (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021
RECLAMATION AND CLOSURE COST OBLIGATIONS |  |
Beginning Balance | $ 160.2 | $ 119.2
Reclamation expenditures | (4.0) | (9.8)
Unwinding of discount | 3.2 | 2.2
Revisions to expected cash flows | (30.1) | 48.4
Foreign exchange movement | (8.1) | 0.2
Ending Balance | 121.2 | 160.2
Less: current portion of closure costs | (1.7) | (5.6)
Non-current portion of closure costs | 119.5 | 154.6
Rainy River |  |
RECLAMATION AND CLOSURE COST OBLIGATIONS |  |
Beginning Balance | 109.4 | 81.4
Reclamation expenditures | (1.7) | (3.6)
Unwinding of discount | 2.3 | 1.6
Revisions to expected cash flows | (16.6) | 30.0
Foreign exchange movement | (5.8) | 0.0
Ending Balance | 87.6 | 109.4
Less: current portion of closure costs | (0.4) | (4.2)
Non-current portion of closure costs | 87.2 | 105.2
New Afton |  |
RECLAMATION AND CLOSURE COST OBLIGATIONS |  |
Beginning Balance | 49.3 | 34.2
Reclamation expenditures | 0.0 | 0.0
Unwinding of discount | 0.9 | 0.6
Revisions to expected cash flows | (15.6) | 14.2
Foreign exchange movement | (2.3) | 0.3
Ending Balance | 32.3 | 49.3
Less: current portion of closure costs | 0.0 | 0.0
Non-current portion of closure costs | 32.3 | 49.3
Cerro San Pedro |  |
RECLAMATION AND CLOSURE COST OBLIGATIONS |  |
Beginning Balance | 1.5 | 3.6
Reclamation expenditures | (2.3) | (6.2)
Unwinding of discount | 0.0 | 0.0
Revisions to expected cash flows | 2.1 | 4.2
Foreign exchange movement | 0.0 | (0.1)
Ending Balance | 1.3 | 1.5
Less: current portion of closure costs | (1.3) | (1.4)
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 2022-03-24 -Section D Examples: disclosures -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=37&code=ifrs-tx-2022-en-r&doctype=Illustrative%20Examples&dita_xref=IAS37_IE_D__IAS37_IE_D_TI -URIDate 2022-03-24 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 37 -IssueDate 2022-03-24 -Paragraph 87 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=37&code=ifrs-tx-2022-en-r&anchor=para_87&doctype=Standard -URIDate 2022-03-24 + Details
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