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Mining interests - Carrying amount (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Mining Interests |  |
Property, plant and equipment | $ 1,863.9 | $ 1,787.9
New Afton |  |
Mining Interests |  |
Property, plant and equipment | 922.4 | 818.6
Rainy River |  |
Mining Interests |  |
Property, plant and equipment | 939.3 | 966.7
Other |  |
Mining Interests |  |
Property, plant and equipment | 2.2 | 2.6
Depletable |  |
Mining Interests |  |
Property, plant and equipment | 797.4 | 740.2
Depletable | New Afton |  |
Mining Interests |  |
Property, plant and equipment | 402.8 | 396.5
Depletable | Rainy River |  |
Mining Interests |  |
Property, plant and equipment | 394.6 | 343.7
Depletable | Other |  |
Mining Interests |  |
Property, plant and equipment | 0.0 | 0.0
Non- depletable |  |
Mining Interests |  |
Property, plant and equipment | 237.9 | 261.0
Non- depletable | New Afton |  |
Mining Interests |  |
Property, plant and equipment | 230.9 | 224.0
Non- depletable | Rainy River |  |
Mining Interests |  |
Property, plant and equipment | 5.9 | 35.9
Non- depletable | Other |  |
Mining Interests |  |
Property, plant and equipment | 1.1 | 1.1
Plant & equipment |  |
Mining Interests |  |
Property, plant and equipment | 739.5 | 668.6
Plant & equipment | New Afton |  |
Mining Interests |  |
Property, plant and equipment | 271.5 | 154.0
Plant & equipment | Rainy River |  |
Mining Interests |  |
Property, plant and equipment | 466.9 | 513.1
Plant & equipment | Other |  |
Mining Interests |  |
Property, plant and equipment | 1.1 | 1.5
Construction in progress |  |
Mining Interests |  |
Property, plant and equipment | 89.1 | 118.1
Construction in progress | New Afton |  |
Mining Interests |  |
Property, plant and equipment | 17.2 | 44.1
Construction in progress | Rainy River |  |
Mining Interests |  |
Property, plant and equipment | 71.9 | 74.0
Construction in progress | Other |  |
Mining Interests |  |
Property, plant and equipment | $ 0.0 | $ 0.0

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- Definition The amount of tangible assets that: (a) are held for use in the production or supply of goods or services, for rental to others, or for administrative purposes; and (b) are expected to be used during more than one period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2022-03-24 -Paragraph 73 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=16&code=ifrs-tx-2022-en-r&anchor=para_73_e&doctype=Standard -URIDate 2022-03-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2022-03-24 -Paragraph 54 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2022-en-r&anchor=para_54_a&doctype=Standard -URIDate 2022-03-24 + Details
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