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Shareholders' equity, net (Details 4) | 12 Months Ended
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Dec. 31, 2018 Number
Disclosure of Shareholders' equity, net [Line Items] |
Number of shareholders | 2,815
Up to 1.00 [Member] |
Disclosure of Shareholders' equity, net [Line Items] |
Number of shareholders | 2,811
From 1.01 to 20.00 [Member] |
Disclosure of Shareholders' equity, net [Line Items] |
Number of shareholders | 2
From 20.01 to 30.00 [Member] |
Disclosure of Shareholders' equity, net [Line Items] |
Number of shareholders | 1
From 30.01 to 60.00 [Member] |
Disclosure of Shareholders' equity, net [Line Items] |
Number of shareholders | 1
Sociedad Minera Cerro Verde S.A.A. [Member] |
Disclosure of Shareholders' equity, net [Line Items] |
Percentage of equity interest | 100.00%
Sociedad Minera Cerro Verde S.A.A. [Member] | Up to 1.00 [Member] |
Disclosure of Shareholders' equity, net [Line Items] |
Percentage of equity interest | 4.37%
Sociedad Minera Cerro Verde S.A.A. [Member] | From 1.01 to 20.00 [Member] |
Disclosure of Shareholders' equity, net [Line Items] |
Percentage of equity interest | 21.07%
Sociedad Minera Cerro Verde S.A.A. [Member] | From 20.01 to 30.00 [Member] |
Disclosure of Shareholders' equity, net [Line Items] |
Percentage of equity interest | 21.00%
Sociedad Minera Cerro Verde S.A.A. [Member] | From 30.01 to 60.00 [Member] |
Disclosure of Shareholders' equity, net [Line Items] |
Percentage of equity interest | 53.56%

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