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Tax situation (Details 7) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income tax [Abstract]      
Current $ 23,837 $ 39,444 $ 14,222
Deferred (5,825) 14,060 541
Current and deferred tax relating to items credited (charged) directly to equity 263,433 222,594 31,183
Mining tax [Abstract]      
Current Mining Royalty and Special Mining Tax     14,599
Supplementary retirement funds [Abstract]      
Total Supplementary retirement fund 9,330 2,725 464
Income tax expense reported in the statements of comprehensive income 18,012 53,504 14,763
Sociedad Minera Cerro Verde S.A.A. [Member]      
Income tax [Abstract]      
Current 430,974 141,153 (832)
Deferred (167,541) 81,441 32,015
Current and deferred tax relating to items credited (charged) directly to equity 263,433 222,594 31,183
Mining tax [Abstract]      
Current Mining Royalty and Special Mining Tax 213,280 37,763 14,599
Supplementary retirement funds [Abstract]      
Current 10,897 2,205 54
Deferred (1,567) 520 410
Total Supplementary retirement fund 9,330 2,725 464
Income tax expense reported in the statements of comprehensive income $ (486,043) $ (263,082) $ (46,246)