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Investments in associates and joint venture - Additional information (Details) $ / shares in Units, $ in Thousands, £ in Millions |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jan. 31, 2020 GBP (£) shares | Jan. 31, 2020 USD ($) $ / shares shares | Dec. 31, 2020 USD ($) oz $ / shares | Dec. 31, 2019 USD ($) $ / shares | Dec. 31, 2018 USD ($) | Dec. 31, 2016 USD ($) | Feb. 29, 2020 USD ($) shares | Jun. 30, 2018 USD ($) | Dec. 31, 2017 USD ($) shares
Investments in associates and joint ventures |  |  |  |  |  |  |  |  |
Gross proceeds to associate |  |  | $ 13,453 | $ 0 | $ 0 |  |  |  |
Impairment loss |  |  |  |  |  | $ 0 |  |  |
market capitalization of shares |  |  | $ 11,900 |  |  |  |  |  |
market capitalization value per share | $ / shares |  |  | $ 0.18 |  |  |  |  |  |
Number of shares acquired in business combination | shares |  |  |  |  |  |  |  |  | 63,920,000
Percentage of voting equity interests acquired |  |  |  |  |  |  |  |  | 5.00%
Consideration transferred, acquisition-date fair value |  |  |  |  |  |  |  |  | $ 47,900
Minera Yanacocha S.R.L. [Member] |  |  |  |  |  |  |  |  |
Investments in associates and joint ventures |  |  |  |  |  |  |  |  |
Potential outstanding liability |  |  |  |  |  |  | $ 61,000 |  |
Provision for workers participation |  |  | $ 2,100 |  |  |  |  |  |
Percent of common shares acquired |  |  | 43.65% | 43.65% |  |  |  |  |
Consideration transferred, acquisition-date fair value |  |  |  |  |  |  |  | $ 48,000 |
Average production capacity | oz |  |  | 55,413 |  |  |  |  |  |
Interest and penalties |  |  |  |  |  |  | 21,000 |  |
Value added tax payables |  |  |  |  |  |  | $ 8,100 |  |
Sociedad Minera Cerro Verde Saa [Member] |  |  |  |  |  |  |  |  |
Investments in associates and joint ventures |  |  |  |  |  |  |  |  |
Percent of common shares acquired |  |  | 19.58% | 19.58% |  |  |  |  |
market capitalization of shares |  |  | $ 1,434,000 | $ 1,323,000 |  |  |  |  |
market capitalization value per share | $ / shares |  |  | $ 20.92 | $ 19.30 |  |  |  |  |
Transportadora Callao SA [Member] |  |  |  |  |  |  |  |  |
Investments in associates and joint ventures |  |  |  |  |  |  |  |  |
Percentage of voting equity interests acquired |  |  | 8.00% |  |  |  |  |  |
Tinka Resources Ltd [Member] |  |  |  |  |  |  |  |  |
Investments in associates and joint ventures |  |  |  |  |  |  |  |  |
Number of common shares acquired | shares | 65,843,620 | 65,843,620 |  |  |  |  | 65,843,620 |  |
Price per share | $ / shares |  | $ 0.243 |  |  |  |  |  |  |
Gross proceeds to associate | £ 16 | $ 13,400 | $ 13,453 |  |  |  |  |  |
Percent of common shares acquired | 19.30% | 19.30% | 19.30% |  |  |  |  |  |

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