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Investments in associates and joint ventures - Statements of financial position of Coimolache under IFRS (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Investments in associates and joint ventures        
Current assets $ 648,619 $ 761,134    
Non-current assets 3,458,655 3,456,087    
Current liabilities (565,357) (399,182)    
Non-current liabilities (573,717) (788,474)    
Equity 2,968,200 3,029,565 $ 3,063,627 $ 3,047,213
Group's interest 1,488,247 1,473,382 $ 1,536,887  
Compania Minera Coimolache S.A. [Member]        
Investments in associates and joint ventures        
Current assets 145,692 99,887    
Non-current assets 234,223 261,782    
Current liabilities (34,028) (39,204)    
Non-current liabilities (91,069) (86,103)    
Equity 254,818 236,362    
Adjustments to conform to the accounting policies of the Group (9,330) (13,003)    
Shareholders' equity, adjusted 245,488 223,359    
Group's interest $ 98,426 $ 89,554