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Subsidiaries with material non-controlling interest (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Accumulated balances of material non-controlling interest:      
Non-controlling interests $ 196,678 $ 221,237 $ 215,590
Profit (loss) allocated to material non-controlling interest:      
Profit (loss), attributable to non-controlling interests (16,251) 1,791 3,612
Sociedad Minera El Brocal S.A.A. [Member]      
Accumulated balances of material non-controlling interest:      
Non-controlling interests 161,917 176,978  
Profit (loss) allocated to material non-controlling interest:      
Profit (loss), attributable to non-controlling interests (13,432) 2,880 4,246
Minera La Zanja S.R.L. [Member]      
Accumulated balances of material non-controlling interest:      
Non-controlling interests 33,026 42,295  
Profit (loss) allocated to material non-controlling interest:      
Profit (loss), attributable to non-controlling interests (9,090) (6,346) (6,006)
S.M.R.L. Chaupiloma Dos de Cajamarca [Member]      
Accumulated balances of material non-controlling interest:      
Non-controlling interests 1,587 1,800  
Profit (loss) allocated to material non-controlling interest:      
Profit (loss), attributable to non-controlling interests 6,286 5,667 5,827
Apu Coropuna S.R.L. [Member]      
Accumulated balances of material non-controlling interest:      
Non-controlling interests 148 164  
Profit (loss) allocated to material non-controlling interest:      
Profit (loss), attributable to non-controlling interests (14) (410) (454)
Other minor subsidiaries [Member]      
Profit (loss) allocated to material non-controlling interest:      
Profit (loss), attributable to non-controlling interests (1) $ 0 (1)
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%  
Accumulated balances of material non-controlling interest:      
Non-controlling interests 161,917 $ 176,978 165,032
Profit (loss) allocated to material non-controlling interest:      
Profit (loss), attributable to non-controlling interests (13,432) $ 2,880 4,246
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%  
Accumulated balances of material non-controlling interest:      
Non-controlling interests 33,026 $ 42,295 48,642
Profit (loss) allocated to material non-controlling interest:      
Profit (loss), attributable to non-controlling interests (9,090) $ (6,346) (6,006)
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%  
Accumulated balances of material non-controlling interest:      
Non-controlling interests 1,587 $ 1,800 1,693
Profit (loss) allocated to material non-controlling interest:      
Profit (loss), attributable to non-controlling interests 6,286 $ 5,667 5,827
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%  
Accumulated balances of material non-controlling interest:      
Non-controlling interests 148 $ 164 223
Profit (loss) allocated to material non-controlling interest:      
Profit (loss), attributable to non-controlling interests (14) (410) (454)
Country of domicile [member] | Other minor subsidiaries [Member]      
Profit (loss) allocated to material non-controlling interest:      
Profit (loss), attributable to non-controlling interests $ (1) $ 0 $ (1)