XML 184 R170.htm IDEA: XBRL DOCUMENT v3.19.1
Shareholders' equity, net (Details 4)
 12 Months Ended
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%