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SUPPLEMENTAL CASH FLOW INFORMATION | 12 Months Ended
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Dec. 31, 2019
SUPPLEMENTAL CASH FLOW INFORMATION |
SUPPLEMENTAL CASH FLOW INFORMATION | 19. 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) |  | 2019 |  | 2018
CHANGE IN NON-CASH OPERATING WORKING CAPITAL |  |  |  |
Trade and other receivables |  | 4.4 |  | (5.4)
Inventories |  | 16.2 |  | (53.1)
Prepaid expenses and other |  | (2.3) |  | (0.6)
Trade and other payables |  | 7.6 |  | (12.5)
Total change in non-cash operating working capital |  | 25.9 |  | (71.6)
|  | Year ended December 31
(in millions of U.S. dollars) |  | 2019 |  | 2018
OTHER NON-CASH ADJUSTMENTS |  |  |  |
Unrealized loss on concentrate contracts |  | (0.2) |  | 0.7
Equity settled share-based payment expense |  | 0.7 |  | 2.7
Loss on disposal of assets |  | 1.2 |  | 0.3
Settlement and loss on revaluation of gold price option contracts |  | 21.7 |  | 4.8
Unrealized gain on gold stream obligation |  | (20.1) |  | (11.7)
Settlement (gain) loss on revaluation of copper price option contracts |  | 0.7 |  | (4.8)
Revaluation of CSP’s reclamation and closure cost obligation |  | (0.6) |  | 1.0
Inventory write-downs |  | 14.1 |  | 15.8
Other non-cash adjustments |  | — |  | 0.2
Total other non-cash adjustments |  | 17.5 |  | 9.0

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