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Shareholders' equity, net - Additional information (Details) |  |  |  | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Apr. 30, 2019 | Mar. 29, 2019 USD ($) $ / shares | Jan. 15, 2017 | Dec. 31, 2020 S/ / shares | Dec. 31, 2020 USD ($) shares | Dec. 31, 2019 USD ($) S/ / shares $ / shares | Dec. 31, 2019 USD ($) $ / shares shares | Dec. 31, 2018 USD ($) shares | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2020 USD ($) $ / shares shares | Jun. 14, 2018 shares | Dec. 31, 2009 $ / shares | Jul. 11, 2003 $ / shares
Disclosure of Shareholders' equity, net [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Trading frequency |  |  |  |  | 5.00% |  | 25.00% |  |  |  |  |  |  |
Par value per share | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  | $ 2.83 | $ 0.54
Increase in legal reserves | $ |  |  |  |  | $ 26,000 |  | $ 53,000 | $ 44,000 |  |  |  |  |  |
Dividends declared to non controlling interest | $ |  |  |  |  | $ 5,140,000 |  | $ 6,500,000 | $ 5,560,000 |  |  |  |  |  |
Total number of common and investment shares outstanding |  |  |  |  | 253,986,867 |  | 253,986,867 | 253,986,867 |  |  |  |  |  |
Quoted price per equity share | $ / shares |  |  |  |  |  | $ 19.30 | $ 19.30 |  |  |  | $ 20.92 |  |  |
Number of shares outstanding |  |  |  |  |  |  |  |  |  |  | 350,056,012 |  |  |
Number of shares authorised |  |  |  |  |  |  |  |  |  |  | 350,056,012 |  |  |
Number of shares issued |  |  |  |  |  |  |  |  |  |  | 350,056,012 |  |  |
Dividend Declared | $ |  | $ 150,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Dividend Declared Per Share | $ / shares |  | $ 0.428503 |  |  |  |  |  |  |  |  |  |  |  |
Withholding Taxes Percentage | 4.10% |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Shareholders' equity, net [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other capital reserve, Percentage |  |  |  |  | 10.00% |  |  |  |  |  |  |  |  |
Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Shareholders' equity, net [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other capital reserve, Percentage |  |  |  |  | 20.00% |  |  |  |  |  |  |  |  |
Changes in tax rates or tax laws enacted or announced [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Shareholders' equity, net [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Withholding tax rate, Percent |  |  | 5.00% |  |  |  |  |  |  |  |  |  |  |
Common shares [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Shareholders' equity, net [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Market price per share | S/ / shares |  |  |  | S/ 43.80 |  | $ 47.77 |  |  |  |  |  |  |  |
Par value per share | S/ / shares |  |  |  | 10.00 |  |  |  |  |  |  |  |  |  |
Number of shares outstanding |  |  |  |  |  |  |  |  |  |  | 274,889,924 |  |  |
investment shares [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Shareholders' equity, net [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Market price per share | S/ / shares |  |  |  | 16.00 |  |  |  |  |  |  |  |  |  |
Par value per share | S/ / shares |  |  |  | S/ 10.00 |  |  |  |  |  |  |  |  |  |
Minera Yanacocha SRL and subsidiary [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Shareholders' equity, net [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares issued |  |  |  |  |  |  |  |  |  |  |  | 63,922,565 |  |
Applicable Dividend Distribution Tax Rate |  |  |  |  |  |  |  |  | 5.00% | 6.80% |  |  |  |
Sociedad Minera Cerro Verde S.A.A. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Shareholders' equity, net [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other equity contributions | $ |  |  |  |  |  | $ 10,100,000 | $ 10,100,000 | $ 8,900,000 |  |  | $ 11,500,000 |  |  |

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