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Earnings per share (Tables) | 12 Months Ended
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Dec. 31, 2018
Sociedad Minera Cerro Verde S.A.A. [Member] |
Disclosure Of Earnings per share [Line Items] |
Disclosure detailed information about earnings per share [Text Block] | Basic and diluted earnings per share are calculated by dividing earnings by the weighted-average number of outstanding shares during the period. Basic and diluted earnings per common share have been determined as follows:
|  | For the year ended December 31, 2018 |  |  | For the year ended December 31, 2017 |  |  | For the year ended December 31, 2016 |
|  | US$ |  |  | US$ |  |  | US$ |
Profit for the period (US$) |  |  | 119,710,000 |  |  |  | 349,881,000 |  |  |  | 340,907,000 |
Weighted average number of share outstanding (Note 12(a)) |  |  | 350,056,012 |  |  |  | 350,056,012 |  |  |  | 350,056,012 |
Basic and diluted earnings per share (US$) |  |  | 0.342 |  |  |  | 1.000 |  |  |  | 0.974 |

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