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Investments in associates (Details Textual) shares in Thousands, $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 USD ($) $ / Ounce-oz shares | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2018 $ / Ounce-oz
Disclosure of Investments in associates [Line Items] |  |  |  |
Proportion of ownership interest in associate | 45.95% | 43.65% |  |
Impairment loss | $ 21,620 | $ 0 | $ 3,803 |
Dividends recognised as distributions to owners | $ (28,135) | (15,021) | (10,488) |
market capitalization of shares |  | $ 1,311,300 |  |
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 |  |  |
Pre-tax discount rate applied to the pre-tax cash flows | 8.33% |  |  |
Gold [Member] |  |  |  |
Disclosure of Investments in associates [Line Items] |  |  |  |
Commodity price estimates | $ / Ounce-oz | 1,221 |  |  |
Gold [Member] | Scenario, Plan [Member] |  |  |  |
Disclosure of Investments in associates [Line Items] |  |  |  |
Commodity price estimates | $ / Ounce-oz |  |  |  | 1,300
Minera Yanacocha S.R.L. [Member] |  |  |  |
Disclosure of Investments in associates [Line Items] |  |  |  |
Proportion of ownership interest in associate | 45.95% | 43.65% |  |
Impairment loss | $ 0 | $ (889,499) | 0 |
Deferred tax expense arising from write-down or reversal of write-down of deferred tax asset |  |  | $ 510,000,000,000 |
Dividends recognised as distributions to owners |  | 300,000,000,000 |  |
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 | 19.584% | 19.584% |  |
market capitalization of shares | $ 2,036,000 |  |  |
market capitalization value per share | 29.70% | 19.11% |  |

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