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Supplemental cash flow information (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
CHANGE IN NON-CASH OPERATING WORKING CAPITAL |  |
Trade and other receivables | $ 9.5 | $ (8.8)
Inventories | (4.8) | 10.6
Prepaid expenses and other | 0.2 | (6.7)
Trade and other payables | (3.9) | 21.1
Total change in non-cash operating working capital | 1.0 | 16.2
OTHER NON-CASH ADJUSTMENTS |  |
Unrealized loss on concentrate contracts | 0.6 | 0.9
Equity settled share-based payment expense | 1.5 | 2.4
Loss on disposal of assets | 2.0 | 1.6
Settlement and gain on revaluation of gold price option contracts | 0.0 | (26.4)
Loss on revaluation of copper price option contracts | 1.5 | 0.0
Unrealized loss on revaluation of non-current derivative financial instruments | 62.9 | 110.4
Loss (gain) on revaluation of investments | 21.3 | (17.4)
Gain on receivable associated with Mesquite sale | 0.0 | (12.8)
Revaluation of CSP’s reclamation and closure cost obligation | 4.5 | (3.4)
Total other non-cash adjustments | $ 94.3 | $ 55.3

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- Definition Adjustments for decrease (increase) in trade and other receivables to reconcile profit (loss) to net cash flow from (used in) operating activities. [Refer: Trade and other receivables; Profit (loss)] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 7 -IssueDate 2021-01-01 -Paragraph 20 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2021-en-r&anchor=para_20&doctype=Standard -URIDate 2021-03-24 + 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 2021-01-01 -Paragraph 98 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_98&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition Adjustments for non-cash items to reconcile profit (loss) to net cash flow from (used in) operating activities that the entity does not separately disclose in the same statement or note. [Refer: Profit (loss)] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 7 -IssueDate 2021-01-01 -Paragraph 20 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2021-en-r&anchor=para_20_b&doctype=Standard -URIDate 2021-03-24 + Details
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