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Revenue from sales (Tables) | 12 Months Ended
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Dec. 31, 2018
Disclosure Of Detailed Information About Net Sales To Customers By Geographical Areas [Text Block] |
| (a) | The Company’s revenues are mainly from sales of gold ounces. The table below presents the net sales to customers by geographic region:
|  | 2018 |  |  | 2017 |  |  | 2016 |
|  | US$(000) |  |  | US$(000) |  |  | US$(000) |
Sales and services by geographic region: |  |  |  |  |  |  |  |  |  |  |  |
Metal sales |  |  |  |  |  |  |  |  |  |  |  |
Switzerland |  |  | 518,664 |  |  |  | 491,887 |  |  |  | 558,723 |
America |  |  | 139,989 |  |  |  | 179,018 |  |  |  | 233,043 |
|  |  | 658,653 |  |  |  | 670,905 |  |  |  | 791,766 |
Royalties, note 1(a) and 22 |  |  | (20,385 | ) |  |  | (20,739 | ) |  |  | (24,339 | )
Mining royalties to the government |  |  | (2,875 | ) |  |  | (4,990 | ) |  |  | (6,234 | )
|  |  | 635,393 |  |  |  | 645,176 |  |  |  | 761,193 |
Minera Yanacocha SRL and subsidiary [member] |
Disclosure of Detailed Information About Other Operating Income [Table Text Block] |
| (b) | Other operating income is made up as follows:
|  | 2018 |  |  | 2017 |  |  | 2016 |
|  | US$(000) |  |  | US$(000) |  |  | US$(000) |
Sales of copper and silver |  |  | 20,442 |  |  |  | 17,509 |  |  |  | 8,136 |
Others |  |  | 1,523 |  |  |  | 4,361 |  |  |  | 9,577 |
|  |  | 21,965 |  |  |  | 21,870 |  |  |  | 17,713 |

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