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Inventories | 12 Months Ended
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Dec. 31, 2022
Inventories [Abstract] |
Inventories | Inventories
(CAD$ in millions) |  | December 31, 2022 |  | December 31, 2021
Supplies |  | $ | 1,045 |  |  | $ | 797 |
Raw materials |  | 278 |  |  | 250 |
Work in process |  | 857 |  |  | 741 |
Finished products |  | 718 |  |  | 728 |
|  | 2,898 |  |  | 2,516 |
Less non-current portion (Note 14) |  | (213) |  |  | (126) |
|  | $ | 2,685 |  |  | $ | 2,390 |
Cost of sales of $8.7 billion (2021 – $7.6 billion) includes $7.7 billion (2021 – $6.7 billion) of production costs that were recognized as part of inventories and subsequently expensed when sold during the year. Total inventories held at net realizable value amounted to $40 million at December 31, 2022 (2021 – $45 million). Total inventory write-downs in 2022 were $50 million (2021 – $nil) and were included as part of cost of sales. Non-current inventories consist of ore stockpiles and other in-process materials that are not expected to be sold within one year.

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