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Financial risk management (Details 1) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure Of Financial risk management [Line Items]        
Current trade payables $ 48,847 $ 43,108    
Other current payables 33,689 39,261    
Financial liabilities 587,062 633,083 $ 592,342 $ 353,710
Not later than three months [member]        
Disclosure Of Financial risk management [Line Items]        
Current trade payables 231,080 194,890    
Payables to related parties 6,014 5,534    
Other financial liabilities 0 0    
Current provisions for employee benefits 24,300 64,339    
Other current payables 7,472 3,374    
Financial liabilities 268,866 268,137    
Later than three months and not later than one year [member]        
Disclosure Of Financial risk management [Line Items]        
Current trade payables 56 68    
Payables to related parties 0 0    
Other financial liabilities 0 0    
Current provisions for employee benefits 18,269 16,406    
Other current payables 93,782 36,808    
Financial liabilities 112,107 53,282    
Later than one year and not later than five years [member]        
Disclosure Of Financial risk management [Line Items]        
Current trade payables 0 0    
Payables to related parties 8,860 8,147    
Other financial liabilities 1,022,810 1,268,488    
Current provisions for employee benefits 32,509 29,158    
Other current payables 215,070 33,424    
Financial liabilities 1,279,249 1,339,217    
On Demands [Member]        
Disclosure Of Financial risk management [Line Items]        
Current trade payables 0 0    
Payables to related parties 0 0    
Other financial liabilities 0 0    
Current provisions for employee benefits 0 0    
Other current payables 0 0    
Financial liabilities 0 0    
Sociedad Minera Cerro Verde S.A.A. [Member]        
Disclosure Of Financial risk management [Line Items]        
Current trade payables 231,136 194,958    
Payables to related parties 14,874 13,681    
Other financial liabilities 1,022,810 1,268,488    
Current provisions for employee benefits 75,078 109,903    
Other current payables 316,324 73,606    
Financial liabilities $ 1,660,222 $ 1,660,636