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Cash and cash equivalents (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Disclosure of Cash and cash equivalents [Line Items]        
Petty cash $ 327 $ 290    
Bank accounts [1] 51,953 48,754    
Time deposits [2] 162,271 31,500    
Cash and cash equivalents 214,551 80,544 $ 78,519 $ 78,512
Minera Yanacocha SRL and subsidiary [Member]        
Disclosure of Cash and cash equivalents [Line Items]        
Petty cash 34 45    
Bank accounts 48,995 118,853    
Time deposits [3] 625,985 558,626    
Cash and cash equivalents 675,014 677,524    
Sociedad Minera Cerro Verde S.A.A. [Member]        
Disclosure of Cash and cash equivalents [Line Items]        
Bank accounts 3,500 2,990    
Cash equivalents (a) 596,527 26,961    
Cash and cash equivalents $ 600,027 $ 29,951    
[1] Bank accounts earn interest at floating rates based on market rates.
[2] As of December 31, 2017 and 2016, time deposits were kept in prime financial institutions, which generated interest at annual market rates and had original maturities of less than 90 days, according to the immediate cash needs of the Group.
[3] The bank accounts and term deposits yield interest at market rates. Because of the short maturity of these balances, less than 90 days, the carrying amounts approximate to their fair value.