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Financial - risk management objectives and policies - Aging of obligations (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure Of Financial risk management [Line Items]        
Trade and other payables. $ 166,860 $ 188,723    
Total financial liabilities 571,688 587,062 $ 633,083 $ 592,342
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    
Not later than three months [member]        
Disclosure Of Financial risk management [Line Items]        
Trade accounts payable 224,675 231,080    
Accounts payable - related parties 4,014 6,014    
Other financial liabilities 3 0    
Trade and other payables. 40,357 7,472    
Total financial liabilities 269,049 244,566    
Later than three months and not later than one year [member]        
Disclosure Of Financial risk management [Line Items]        
Trade accounts payable 245 56    
Accounts payable - related parties 0 0    
Other financial liabilities 8,852 0    
Trade and other payables. 59,023 93,782    
Total financial liabilities 68,120 93,838    
Later than one year and not later than five years [member]        
Disclosure Of Financial risk management [Line Items]        
Accounts payable - related parties 10,074 8,860    
Other financial liabilities 825,877 1,022,810    
Trade and other payables. 72,759 183,824    
Total financial liabilities 908,710 1,215,494    
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 76,943 0    
Trade and other payables. 289,705 31,246    
Total financial liabilities 366,648 31,246    
Sociedad Minera Cerro Verde S.A.A. [Member]        
Disclosure Of Financial risk management [Line Items]        
Trade accounts payable 224,920 231,136    
Accounts payable - related parties 14,088 14,874    
Other financial liabilities 911,675 1,022,810    
Trade and other payables. 461,844 316,324    
Total financial liabilities $ 1,612,527 $ 1,585,144