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Subsidiaries with material non-controlling interest (Details 1) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure Of Subsidiaries with material non-controlling interest [Line Items]        
Current assets $ (761,134) $ (701,862)    
Non-current assets (3,456,087) (3,630,951)    
Current liabilities (399,182) (521,194)    
Non-current liabilities (788,474) (747,992)    
Total shareholders' equity, net 3,029,565 3,063,627 $ 3,047,213 $ 3,389,236
Shareholders of the parent 2,808,328 2,848,037    
Non-controlling interests 221,237 215,590    
Sociedad Minera El Brocal S.A.A. [Member]        
Disclosure Of Subsidiaries with material non-controlling interest [Line Items]        
Current assets 170,274 146,865    
Non-current assets 603,280 645,729    
Current liabilities (123,052) (159,190)    
Non-current liabilities (217,683) (229,709)    
Total shareholders' equity, net 432,819 403,695    
Shareholders of the parent 255,841 239,925    
Non-controlling interests 176,978 165,032    
S.M.R.L. Chaupiloma Dos de Cajamarca [Member]        
Disclosure Of Subsidiaries with material non-controlling interest [Line Items]        
Current assets 7,154 6,640    
Non-current assets 0 0    
Current liabilities (2,653) (2,407)    
Non-current liabilities 0 0    
Total shareholders' equity, net 4,501 4,233    
Shareholders of the parent 2,701 2,540    
Non-controlling interests 1,800 1,693    
Minera La Zanja S.R.L. [Member]        
Disclosure Of Subsidiaries with material non-controlling interest [Line Items]        
Current assets 126,878 134,758    
Non-current assets 31,841 55,873    
Current liabilities (25,834) (38,807)    
Non-current liabilities (42,781) (48,201)    
Total shareholders' equity, net 90,104 103,623    
Shareholders of the parent 47,808 54,981    
Non-controlling interests 42,296 48,642    
Apu Coropuna S.R.L. [Member]        
Disclosure Of Subsidiaries with material non-controlling interest [Line Items]        
Current assets 2,263 1,440    
Non-current assets 182 189    
Current liabilities (1,165) (143)    
Non-current liabilities (740) (740)    
Total shareholders' equity, net 540 746    
Shareholders of the parent 377 523    
Non-controlling interests 163 223    
Other minor subsidiaries [Member]        
Disclosure Of Subsidiaries with material non-controlling interest [Line Items]        
Current assets 0 665    
Non-current assets 0 30    
Current liabilities 0 (29)    
Non-current liabilities 0 (2)    
Total shareholders' equity, net 0 664    
Shareholders of the parent 0 664    
Non-controlling interests $ 0 $ 0