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Inventories | 12 Months Ended
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Dec. 31, 2018
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Inventories |
13. | Inventories
|  | December 31, 2018 |  |  | December 31, 2017 |
(CAD$ in millions) |  |  |  |  | (restated) |
Supplies |  | $ | 693 |  |  | $ | 563 |
Raw materials |  |  | 300 |  |  |  | 223 |
Work in process |  |  | 595 |  |  |  | 529 |
Finished products |  |  | 539 |  |  |  | 462 |
|  |  | 2,127 |  |  |  | 1,777 |
Less long-term portion (Note 14) |  |  | (62 | ) |  |  | (108 | )
|  | $ | 2,065 |  |  | $ | 1,669 |
Cost of sales of $7.9 billion (2017 – $7.3 billion) include $7.3 billion (2017 – $6.6 billion) of inventories recognized as an expense during the year. Total inventories held at net realizable value amounted to $172 million at December 31, 2018 (December 31, 2017 – $17 million). Total inventory write-downs in 2018 were $82 million (2017 – $20 million) and were included as part of cost of sales. Total reversals of inventory write-downs previously recorded was nil in 2018 (2017 – $30 million). Long-term inventories consist of ore stockpiles and other in-process materials that are not expected to be processed within one year.

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