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Financial - risk management objectives and policies - Aging of obligations (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2016
Disclosure Of Financial risk management [Line Items]        
Trade and other payables. $ 179,956 $ 166,860    
Total financial liabilities 531,653 571,688 $ 587,062 $ 633,083
Sociedad Minera Cerro Verde S.A.A. [Member]        
Disclosure Of Financial risk management [Line Items]        
Trade accounts payable 207,625 252,865    
Accounts payable - related parties 3,446 4,014    
Other financial liabilities 602,668 911,675    
Trade and other payables. 411,857 479,104    
Total financial liabilities 1,225,596 1,647,658    
Sociedad Minera Cerro Verde S.A.A. [Member] | On Demands [Member]        
Disclosure Of Financial risk management [Line Items]        
Trade accounts payable 0 0    
Accounts payable - related parties 0 0    
Other financial liabilities 0 0    
Trade and other payables. 0 0    
Total financial liabilities 0 0    
Sociedad Minera Cerro Verde S.A.A. [Member] | Not later than three months [member]        
Disclosure Of Financial risk management [Line Items]        
Trade accounts payable 197,855 245,463    
Accounts payable - related parties 3,446 4,014    
Other financial liabilities 1,551 3    
Trade and other payables. 57,637 40,357    
Total financial liabilities 260,489 289,837    
Sociedad Minera Cerro Verde S.A.A. [Member] | Later than three months and not later than one year [member]        
Disclosure Of Financial risk management [Line Items]        
Trade accounts payable 9,770 7,402    
Accounts payable - related parties 0 0    
Other financial liabilities 8,672 8,852    
Trade and other payables. 68,828 59,023    
Total financial liabilities 87,270 75,277    
Sociedad Minera Cerro Verde S.A.A. [Member] | Later than one year and not later than five years [member]        
Disclosure Of Financial risk management [Line Items]        
Other financial liabilities 560,750 825,877    
Trade and other payables. 285,392 90,019    
Total financial liabilities 846,142 915,896    
Sociedad Minera Cerro Verde S.A.A. [Member] | More than 5 years        
Disclosure Of Financial risk management [Line Items]        
Trade accounts payable 0 0    
Accounts payable - related parties 0 0    
Other financial liabilities 31,695 76,943    
Trade and other payables. 0 289,705    
Total financial liabilities $ 31,695 $ 366,648