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Supplemental cash flow information (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021
CHANGE IN NON-CASH OPERATING WORKING CAPITAL |  |
Trade and other receivables | $ (3.5) | $ 9.5
Inventories | (16.0) | (4.8)
Prepaid expenses and other | 3.5 | 0.2
Trade and other payables | 25.1 | (3.9)
Total change in non-cash operating working capital | 9.1 | 1.0
OTHER NON-CASH ADJUSTMENTS |  |
Unrealized loss on revaluation of foreign exchange forward contracts | 0.8 | 0.0
Unrealized loss on concentrate contracts | 1.8 | 0.6
Equity settled share-based payment expense | 1.0 | 1.5
Loss on disposal of assets | 2.0 | 2.0
Loss on revaluation of copper price option contracts | 0.0 | 1.5
Unrealized (gain) loss on revaluation of non-current derivative financial instruments | (3.0) | 62.9
Loss on revaluation of CSP’s reclamation and closure cost obligation | 2.0 | 4.5
Inventory provision | 4.0 | 0.0
Loss on revaluation of investments | 28.0 | 21.3
Total other non-cash adjustments | $ 36.6 | $ 94.3

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- Definition The amount of expense arising from equity-settled share-based payment transactions in which the goods or services received did not qualify for recognition as assets. [Refer: Expense from share-based payment transactions] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2022-03-24 -Paragraph 51 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2022-en-r&anchor=para_51_a&doctype=Standard -URIDate 2022-03-24 + Details
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- Definition The gains (losses) on disposals of other non-current assets. [Refer: Other non-current assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2022-03-24 -Paragraph 98 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2022-en-r&anchor=para_98&doctype=Standard -URIDate 2022-03-24 + Details
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