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Expenses by Nature (Tables) | 12 Months Ended
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Dec. 31, 2017
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Schedule of Expenses by Nature |
(CAD$ in millions) |  | 2017 |  |  | 2016 |
Employment-related costs: |  |  |  |  |  |  |  |
Wages and salaries |  | $ | 899 |  |  | $ | 858 |
Employee benefits and other wage-related costs |  |  | 236 |  |  |  | 250 |
Bonus payments |  |  | 192 |  |  |  | 162 |
Post-employment benefits and pension costs |  |  | 122 |  |  |  | 112 |
|  |  | 1,449 |  |  |  | 1,382 |
Transportation |  |  | 1,331 |  |  |  | 1,270 |
Depreciation and amortization |  |  | 1,467 |  |  |  | 1,385 |
Raw material purchases |  |  | 824 |  |  |  | 876 |
Fuel and energy |  |  | 657 |  |  |  | 596 |
Operating supplies consumed |  |  | 569 |  |  |  | 558 |
Maintenance and repair supplies |  |  | 698 |  |  |  | 586 |
Contractors and consultants |  |  | 570 |  |  |  | 427 |
Overhead costs |  |  | 287 |  |  |  | 293 |
Royalties |  |  | 453 |  |  |  | 312 |
Other operating costs |  |  | 9 |  |  |  | 13 |
|  |  | 8,314 |  |  |  | 7,698 |
Less: |  |  |  |  |  |  |  |
Capitalized production stripping costs |  |  | (678 | ) |  |  | (477 | )
Change in inventory |  |  | 12 |  |  |  | (137 | )
Total cost of sales, general and administration, exploration and research and development expenses |  | $ | 7,648 |  |  | $ | 7,084 |

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