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Cost of Sales (Tables) | 12 Months Ended
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Dec. 31, 2017
Text block1 [abstract] |
Summary of Cost of Sale |
|  | UNITED STATES DOLLAR |
|  | 2017 |  |  | 2016 |  |  | 2015 |
|  |  |  |  | Restated1 |  |  | Restated1 |
Salaries and wages |  |  | (414.7 | ) |  |  | (388.1 | ) |  |  | (368.0 | )
Consumable stores |  |  | (346.7 | ) |  |  | (346.3 | ) |  |  | (380.7 | )
Utilities |  |  | (150.1 | ) |  |  | (169.8 | ) |  |  | (162.4 | )
Mine contractors |  |  | (307.4 | ) |  |  | (308.4 | ) |  |  | (284.9 | )
Other |  |  | (207.6 | ) |  |  | (163.1 | ) |  |  | (175.5 | )
Cost of sales before gold inventory change and amortisation and depreciation |  |  | (1,426.5 | ) |  |  | (1,375.7 | ) |  |  | (1,371.5 | )
Gold inventory change |  |  | 69.5 |  |  |  | 45.9 |  |  |  | (25.5 | )
Cost of sales before amortisation and depreciation |  |  | (1,357.0 | ) |  |  | (1,329.8 | ) |  |  | (1,397.0 | )
Amortisation and depreciation2 |  |  | (748.1 | ) |  |  | (671.4 | ) |  |  | (591.5 | )
Total cost of sales |  |  | (2,105.1 | ) |  |  | (2,001.2 | ) |  |  | (1,988.5 | )
| 1 | Refer note 40 for further details.
| 2 | The methodology for amortisation and depreciation at Cerro Corona was amended in 2017, changing to gold ounces produced from tonnes mined. Gold ounces are considered a better reflection of the pattern in which the mine’s future economic benefits are expected to be consumed by the mine in line with the declining grade over the life-of-mine.
| 2 | The impact of the change in useful life at Cerro Corona resulted in an increase in amortisation and depreciation of US$24.5 million for the 2017 year.
| 2 | The methodology for amortisation of the mineral rights asset at the Australian operations was corrected during the year. Refer note 40 for further details.
| 2 | The impact of the correction of the amortisation methodology at the Australian operations resulted in an increase in amortisation of US$5.7 million for the 2017 year.
| 2 | Given the nature of the inputs used to calculate the amortisation and depreciation, namely future production as well as proven and probable reserves, it is not practicable to estimate the future impact the change in useful life and correction in methodology will have on amortisation and depreciation.

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