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Subsidiaries with material non-controlling interest (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Accumulated balances of material non-controlling interest:      
Non-controlling interests $ 221,237 $ 215,590  
Profit (loss) allocated to material non-controlling interest:      
Profit (loss), attributable to non-controlling interests 1,791 3,612 $ (4,322)
Sociedad Minera El Brocal S.A.A. [Member]      
Accumulated balances of material non-controlling interest:      
Non-controlling interests 176,978 165,032  
Profit (loss) allocated to material non-controlling interest:      
Profit (loss), attributable to non-controlling interests 2,880 4,246 (13,426)
S.M.R.L. Chaupiloma Dos de Cajamarca [Member]      
Accumulated balances of material non-controlling interest:      
Non-controlling interests 1,800 1,693  
Profit (loss) allocated to material non-controlling interest:      
Profit (loss), attributable to non-controlling interests 5,667 5,827 6,950
Minera La Zanja S.R.L. [Member]      
Accumulated balances of material non-controlling interest:      
Non-controlling interests 42,296 48,642  
Profit (loss) allocated to material non-controlling interest:      
Profit (loss), attributable to non-controlling interests (6,346) (6,006) 2,342
Apu Coropuna S.R.L. [Member]      
Accumulated balances of material non-controlling interest:      
Non-controlling interests 163 223  
Profit (loss) allocated to material non-controlling interest:      
Profit (loss), attributable to non-controlling interests (410) (454) (157)
Other minor subsidiaries [Member]      
Accumulated balances of material non-controlling interest:      
Non-controlling interests 0 0  
Profit (loss) allocated to material non-controlling interest:      
Profit (loss), attributable to non-controlling interests 0 (1) (31)
Country of domicile [member]      
Accumulated balances of material non-controlling interest:      
Non-controlling interests $ 221,237 $ 215,590 $ 226,122
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 38.57% 38.57% 38.67%
Accumulated balances of material non-controlling interest:      
Non-controlling interests $ 176,978 $ 165,032 $ 167,986
Profit (loss) allocated to material non-controlling interest:      
Profit (loss), attributable to non-controlling interests $ 2,880 $ 4,246 $ (13,426)
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 $ 1,800 $ 1,693 $ 1,906
Profit (loss) allocated to material non-controlling interest:      
Profit (loss), attributable to non-controlling interests $ 5,667 $ 5,827 $ 6,950
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 $ 42,295 $ 48,642 $ 55,613
Profit (loss) allocated to material non-controlling interest:      
Profit (loss), attributable to non-controlling interests $ (6,346) $ (6,006) $ 2,342
Country of domicile [member] | Apu Coropuna S.R.L. [Member]      
Equity interest held by non-controlling interests:      
Proportion of ownership interests held by non-controlling interests 30.00% 30.00% 30.00%
Accumulated balances of material non-controlling interest:      
Non-controlling interests $ 164 $ 223 $ 678
Profit (loss) allocated to material non-controlling interest:      
Profit (loss), attributable to non-controlling interests (410) (454) (157)
Country of domicile [member] | Other minor subsidiaries [Member]      
Accumulated balances of material non-controlling interest:      
Non-controlling interests 0 0 (61)
Profit (loss) allocated to material non-controlling interest:      
Profit (loss), attributable to non-controlling interests $ 0 $ (1) $ (31)