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Supplemental cash flow information | 12 Months Ended
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Dec. 31, 2021
SUPPLEMENTAL CASH FLOW INFORMATION |
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) |  |  | 2021 | 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 |
|  | Year ended December 31
(in millions of U.S. dollars) |  |  | 2021 | 2020
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 |  |  | — |  | (26.4) |
Loss on revaluation of copper price option contracts |  |  | 1.5 |  | — |
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 |  |  | — |  | (12.8) |
Other |  |  | 4.5 |  | (3.4) |
Total other non-cash adjustments |  |  | 94.3 |  | 55.3 |

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