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Subsidiaries with material non-controlling interest (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Accumulated balances of material non-controlling interest:      
Non-controlling interests $ 215,590 $ 226,122 $ 228,170
Profit (loss) allocated to material non-controlling interest:      
Profit (loss), attributable to non-controlling interests 3,612 (4,322) (58,335)
Sociedad Minera El Brocal S.A.A. [Member]      
Accumulated balances of material non-controlling interest:      
Non-controlling interests 165,032 167,986  
Profit (loss) allocated to material non-controlling interest:      
Profit (loss), attributable to non-controlling interests 4,246 (13,426) (34,991)
S.M.R.L. Chaupiloma Dos de Cajamarca [Member]      
Accumulated balances of material non-controlling interest:      
Non-controlling interests 1,693 1,906  
Profit (loss) allocated to material non-controlling interest:      
Profit (loss), attributable to non-controlling interests 5,827 6,950 9,244
Minera La Zanja S.R.L. [Member]      
Accumulated balances of material non-controlling interest:      
Non-controlling interests 48,642 55,613  
Profit (loss) allocated to material non-controlling interest:      
Profit (loss), attributable to non-controlling interests (6,006) 2,342 $ (32,486)
Apu Coropuna S.R.L. [Member]      
Accumulated balances of material non-controlling interest:      
Non-controlling interests 223 678  
Profit (loss) allocated to material non-controlling interest:      
Profit (loss), attributable to non-controlling interests (454) (157)  
Other minor subsidiaries [Member]      
Accumulated balances of material non-controlling interest:      
Non-controlling interests 0 (61)  
Profit (loss) allocated to material non-controlling interest:      
Profit (loss), attributable to non-controlling interests $ (1) $ (31)  
Country of domicile [member] | Sociedad Minera El Brocal S.A.A. [Member]      
Equity interest held by non-controlling interests:      
Proportion of ownership interests held by non-controlling interests 38.58% 38.67% 45.93%
Accumulated balances of material non-controlling interest:      
Non-controlling interests $ 165,032 $ 167,986 $ 172,542
Profit (loss) allocated to material non-controlling interest:      
Profit (loss), attributable to non-controlling interests $ 4,246 $ (13,426) $ (34,991)
Country of domicile [member] | S.M.R.L. Chaupiloma Dos de Cajamarca [Member]      
Equity interest held by non-controlling interests:      
Proportion of ownership interests held by non-controlling interests 40.00% 40.00% 40.00%
Accumulated balances of material non-controlling interest:      
Non-controlling interests $ 1,693 $ 1,906 $ 2,357
Profit (loss) allocated to material non-controlling interest:      
Profit (loss), attributable to non-controlling interests $ 5,827 $ 6,950 $ 9,244
Country of domicile [member] | Minera La Zanja S.R.L. [Member]      
Equity interest held by non-controlling interests:      
Proportion of ownership interests held by non-controlling interests 46.94% 46.94% 46.94%
Accumulated balances of material non-controlling interest:      
Non-controlling interests $ 48,642 $ 55,613 $ 53,271
Profit (loss) allocated to material non-controlling interest:      
Profit (loss), attributable to non-controlling interests (6,006) 2,342 (32,486)
Country of domicile [member] | Apu Coropuna S.R.L. [Member]      
Accumulated balances of material non-controlling interest:      
Non-controlling interests 223 678 0
Profit (loss) allocated to material non-controlling interest:      
Profit (loss), attributable to non-controlling interests (454) (157) (102)
Foreign countries [member] | Other minor subsidiaries [Member]      
Accumulated balances of material non-controlling interest:      
Non-controlling interests 0 (61) 0
Profit (loss) allocated to material non-controlling interest:      
Profit (loss), attributable to non-controlling interests $ (1) $ (31) $ 0