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Financial risk management (Details 1) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Disclosure Of Financial risk management [Line Items]        
Other current payables $ 39,261 $ 55,305    
Financial liabilities 633,083 592,342 $ 353,710 $ 383,305
Not later than three months [member]        
Disclosure Of Financial risk management [Line Items]        
Current trade payables 194,890 168,244    
Payables to related parties 5,534 27,134    
Other financial liabilities 0 0    
Current provisions for employee benefits 64,339 3,807    
Other current payables 3,374 2,402    
Financial liabilities 268,137 201,587    
Later than three months and not later than one year [member]        
Disclosure Of Financial risk management [Line Items]        
Current trade payables 68 113    
Payables to related parties 0 0    
Other financial liabilities 0 161    
Current provisions for employee benefits 16,406 44,232    
Other current payables 36,808 1,217    
Financial liabilities 53,282 45,723    
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 8,147 7,132    
Other financial liabilities 1,268,488 1,995,843    
Current provisions for employee benefits 29,158 0    
Other current payables 0 0    
Financial liabilities 1,305,793 2,002,975    
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 194,958 168,357    
Payables to related parties 13,681 34,266    
Other financial liabilities 1,268,488 1,996,004    
Current provisions for employee benefits 109,903 48,039    
Other current payables 40,182 3,619    
Financial liabilities $ 1,627,212 $ 2,250,285