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v3.19.1

Investments in associates and joint ventures (Details Textual) shares in Thousands, $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) $ / Ounce-oz shares | Dec. 31, 2016 USD ($) | Dec. 31, 2018 $ / Ounce-oz | Dec. 31, 2018 $ / MetricTon-Mg
Disclosure of Investments in associates [Line Items] |  |  |  |  |
Proportion of ownership interest in associate | 43.65% |  |  |  |
Impairment loss |  | $ 21,620 | $ 0 |  |
market capitalization of shares |  | $ 2,036,000 |  |  |
Number of shares acquired in business combination | shares |  | 63,920 |  |  |
Percentage of voting equity interests acquired |  | 5.00% |  |  |
Consideration transferred, acquisition-date fair value |  | $ 47,900 |  |  |
Gold (per ounce) [Member] |  |  |  |  |
Disclosure of Investments in associates [Line Items] |  |  |  |  |
Commodity price estimates |  | 1,221 |  | 1,300 | 1,221
Minera Yanacocha S.R.L. [Member] |  |  |  |  |
Disclosure of Investments in associates [Line Items] |  |  |  |  |
Proportion of ownership interest in associate | 43.65% | 45.95% |  |  |
Impairment loss |  | $ 0 | 889,499 |  |
Recoverable amount of investment in associates, Cash flow projections |  |  | $ 528,900 |  |
Sociedad Minera Cerro Verde S.A.A. [Member] |  |  |  |  |
Disclosure of Investments in associates [Line Items] |  |  |  |  |
Proportion of ownership interest in associate | 19.58% | 19.58% |  |  |
market capitalization of shares | $ 1,426,000 |  |  |  |
market capitalization value per share | 20.80% | 29.70% |  |  |

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