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Costs of sales | 12 Months Ended
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Dec. 31, 2017
Costs of sales |
Costs of sales | Note 15 – Costs of sales Costs of sales are comprised of the following:
|  |  | 2017 |  |  | 2016 |
Per ounce stream purchase cost |  |  | $ | 127.4 |  |  | $ | 95.6 |
Cost of prepaid ounces |  |  |  | 7.7 |  |  |  | 6.5 |
Mineral production taxes |  |  |  | 2.3 |  |  |  | 0.5 |
Oil & gas operating costs |  |  |  | 4.6 |  |  |  | 3.2 |
|  |  | $ | 142.0 |  |  | $ | 105.8 |

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