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Financial obligations (Details) - USD ($)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Jun. 27, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 02, 2009
Disclosure of Financial obligations [Line Items]            
Notional amount $ 275,000,000 $ 275,000,000 $ 275,000,000      
Debt issuance costs (2,425,000) (3,119,000)        
Debt issuance costs (3,803,000) (3,119,000)        
Borrowings 272,575,000 271,881,000        
Financial liabilities 633,083,000 592,342,000   $ 353,710,000 $ 383,305,000  
Classification by maturity:            
Current portion 83,991,000 40,110,000        
Non-current portion (f) 549,092,000 552,232,000        
Financial Liabilities 633,083,000 592,342,000   $ 353,710,000 $ 383,305,000  
Empresa de Generacion Huanza S.A. [Member]            
Classification by maturity:            
Finance lease liabilities           $ 119,000,000
Sociedad Minera El Brocal S.A.A. [Member]            
Disclosure of Financial obligations [Line Items]            
Debt issuance costs (1,377,000) 0        
Financial liabilities 198,087,000 136,985,000        
Classification by maturity:            
Financial Liabilities 198,087,000 136,985,000        
Finance lease liabilities 118,087,000 136,812,000        
BBVA Banco Continental S.A. [Member]            
Disclosure of Financial obligations [Line Items]            
Notional amount 61,667,000 61,667,000        
BBVA Banco Continental S.A. [Member] | Contacto Corredores de Seguros S.A. [Member]            
Classification by maturity:            
Finance lease liabilities 10,000 53,000        
Banco de Credito del Peru [Member]            
Disclosure of Financial obligations [Line Items]            
Notional amount 61,667,000 61,667,000        
CorpBanca New York Branch [Member]            
Disclosure of Financial obligations [Line Items]            
Notional amount 61,666,000 61,666,000        
Banco Internacional del Peru [Member]            
Disclosure of Financial obligations [Line Items]            
Notional amount 30,000,000 30,000,000        
Banco Internacional del Peru [Member] | Empresa de Generacion Huanza S.A. [Member]            
Classification by maturity:            
Finance lease liabilities 119,464,000 136,812,000        
Banco Internacional del Peru [Member] | Sociedad Minera El Brocal S.A.A. [Member]            
Classification by maturity:            
Finance lease liabilities 162,411,000 176,062,000        
Banco Internacional del Peru [Member] | Buenaventura Ingenieros S.A. [Member]            
Classification by maturity:            
Finance lease liabilities 0 7,361,000        
ICBC Peru Bank [Member]            
Disclosure of Financial obligations [Line Items]            
Notional amount 25,000,000 25,000,000        
Banco Latinoamericano de Comercio Exterior S.A. [Member]            
Disclosure of Financial obligations [Line Items]            
Notional amount 20,000,000 20,000,000        
Banco de Sabadell, Miami Branch [Member]            
Disclosure of Financial obligations [Line Items]            
Notional amount 15,000,000 15,000,000        
Mid-term financial obligation [Member] | Sociedad Minera El Brocal S.A.A. [Member]            
Classification by maturity:            
Finance lease liabilities $ 80,000,000 $ 173,000