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Expenses by Nature | 12 Months Ended
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Dec. 31, 2020
Analysis of income and expense [abstract] |
Expenses by Nature | Expenses by Nature
(CAD$ in millions) |  | 2020 |  | 2019
Employment-related costs: |  |  |  |
Wages and salaries |  | $ | 971 |  |  | $ | 1,057 |
Employee benefits and other wage-related costs |  | 272 |  |  | 280 |
Bonus payments |  | 128 |  |  | 207 |
Post-employment benefits and pension costs |  | 124 |  |  | 105 |
|  | 1,495 |  |  | 1,649 |
Transportation |  | 1,378 |  |  | 1,476 |
Depreciation and amortization |  | 1,510 |  |  | 1,619 |
Raw material purchases |  | 715 |  |  | 974 |
Fuel and energy |  | 697 |  |  | 881 |
Operating supplies consumed |  | 620 |  |  | 743 |
Maintenance and repair supplies |  | 648 |  |  | 742 |
Contractors and consultants |  | 648 |  |  | 768 |
Overhead costs |  | 268 |  |  | 277 |
Royalties |  | 266 |  |  | 343 |
Other operating costs |  | 62 |  |  | 45 |
|  | 8,307 |  |  | 9,517 |
Adjusted for: |  |  |  |
Capitalized production stripping costs |  | (499) |  |  | (680) |
Change in inventory |  | 81 |  |  | 52 |
Total cost of sales, general and administration, exploration and research and innovation expenses |  | $ | 7,889 |  |  | $ | 8,889 |
Approximately 23% (2019 – 24%) of our costs are incurred at our foreign operations where the functional currency is the U.S. dollar.

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- Definition The disclosure of expenses by nature. [Refer: Expenses, by nature] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 10 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_10_e&doctype=Standard -URIDate 2020-01-01 + Details
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