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Subsidiaries with material non-controlling interest (Details 1) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Disclosure Of Subsidiaries with material non-controlling interest [Line Items]        
Current assets $ (701,862) $ (501,928)    
Non-current assets (3,630,951) (3,764,487)    
Current liabilities 521,194 445,125    
Non-current liabilities 747,992 774,077    
Total shareholders’ equity, net 3,063,627 3,047,213 $ 3,389,236 $ 3,762,125
Shareholders of the parent 2,848,037 2,821,091    
Non-controlling interests 215,590 226,122 $ 228,170  
Sociedad Minera El Brocal S.A.A. [Member]        
Disclosure Of Subsidiaries with material non-controlling interest [Line Items]        
Current assets 146,865 120,291    
Non-current assets 645,729 642,790    
Current liabilities (159,190) (184,324)    
Non-current liabilities (229,709) (168,589)    
Total shareholders’ equity, net 403,695 410,168    
Shareholders of the parent 239,925 242,182    
Non-controlling interests 165,032 167,986    
S.M.R.L. Chaupiloma Dos de Cajamarca [Member]        
Disclosure Of Subsidiaries with material non-controlling interest [Line Items]        
Current assets 6,640 7,439    
Non-current assets 0 0    
Current liabilities (2,407) (2,684)    
Non-current liabilities 0 0    
Total shareholders’ equity, net 4,233 4,755    
Shareholders of the parent 2,540 2,849    
Non-controlling interests 1,693 1,906    
Minera La Zanja S.R.L. [Member]        
Disclosure Of Subsidiaries with material non-controlling interest [Line Items]        
Current assets 134,758 155,659    
Non-current assets 55,873 90,447    
Current liabilities (38,807) (40,411)    
Non-current liabilities (48,201) (89,278)    
Total shareholders’ equity, net 103,623 116,417    
Shareholders of the parent 54,981 60,804    
Non-controlling interests 48,642 55,613    
Apu Coropuna S.R.L. [Member]        
Disclosure Of Subsidiaries with material non-controlling interest [Line Items]        
Current assets 1,440 2,301    
Non-current assets 189 88    
Current liabilities (143) (129)    
Non-current liabilities (740) 0    
Total shareholders’ equity, net 746 2,260    
Shareholders of the parent 523 1,582    
Non-controlling interests 223 678    
Other minor subsidiaries [Member]        
Disclosure Of Subsidiaries with material non-controlling interest [Line Items]        
Current assets 665 81    
Non-current assets 30 500    
Current liabilities (29) 0    
Non-current liabilities (2) (2)    
Total shareholders’ equity, net 664 579    
Shareholders of the parent 664 640    
Non-controlling interests 0 (61)    
Subsidiaries with material non-controlling interests [member]        
Disclosure Of Subsidiaries with material non-controlling interest [Line Items]        
Current assets 290,368 285,771    
Non-current assets 701,821 733,825    
Current liabilities (200,576) (227,548)    
Non-current liabilities (278,652) (257,869)    
Total shareholders’ equity, net 512,961 534,179    
Shareholders of the parent 298,633 308,057    
Non-controlling interests $ 215,590 $ 226,122