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Supplemental cash flow information
 12 Months Ended
Dec. 31, 2024
SUPPLEMENTAL CASH FLOW INFORMATION [Abstract]  
Supplemental cash flow information Supplemental cash flow information
Supplemental cash flow information (included within operating activities) is as follows:

Year ended December 31
(in millions of U.S. dollars)20242023
CHANGE IN NON-CASH OPERATING WORKING CAPITAL


Trade and other receivables(8.8)(4.1)
Inventories2.8 (6.5)
Prepaid expenses and other(8.3)(1.8)
Trade and other payables(1.7)6.6 
Total change in non-cash operating working capital(16.0)(5.8)

Year ended December 31
(in millions of U.S. dollars)20242023
OTHER NON-CASH ADJUSTMENTS


Loss (gain) on revaluation of foreign exchange forward contracts and fuel hedge swap contracts7.4 (1.4)
Unrealized (gain) loss on provisionally priced concentrate contracts(1.2)0.3 
Equity settled share-based payment expense0.6 0.8 
Gain on extinguishment of New Afton free cash flow obligation(42.3)— 
Loss on disposal of assets0.9 0.3 
Unrealized loss on revaluation of non-current derivative financial instruments130.6 108.1 
Loss on revaluation of CSP’s reclamation and closure cost obligation— 0.5 
Inventory net realizable value (write-up) write-down (Note 7)(16.4)0.7 
Loss on revaluation of investments0.9 4.4 
Total other non-cash adjustments80.6 113.7