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Investments in associates and joint venture (Details) - USD ($)
$ in Thousands
12 Months Ended
Jan. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Investments in associates and joint ventures        
Joint venture (d)   $ 2,254 $ 2,627  
Investments in associates   1,488,775 1,488,247 $ 1,473,382
Investment In Associates And Joint Ventures   $ 1,488,775 $ 1,488,247  
Sociedad Minera Cerro Verde Saa [Member]        
Investments in associates and joint ventures        
Proportion of ownership interest in associate   19.58% 19.58%  
Investments in associates   $ 1,209,126 $ 1,155,359  
Minera Yanacocha S.R.L. [Member]        
Investments in associates and joint ventures        
Proportion of ownership interest in associate   43.65% 43.65%  
Investments in associates   $ 157,835 $ 230,000  
Compania Minera Coimolache S.A. [Member]        
Investments in associates and joint ventures        
Proportion of ownership interest in associate   40.10% 40.10%  
Investments in associates   $ 104,833 $ 98,426  
Tinka Resources Ltd [Member]        
Investments in associates and joint ventures        
Proportion of ownership interest in associate 19.30% 19.30%    
Other minor investments [Member]        
Investments in associates and joint ventures        
Investments in associates   $ 1,865 1,835  
Associates [member]        
Investments in associates and joint ventures        
Investments in associates   1,484,656 1,483,785  
Associates [member] | Sociedad Minera Cerro Verde Saa [Member]        
Investments in associates and joint ventures        
Investments in associates   1,209,126 1,155,359  
Associates [member] | Minera Yanacocha S.R.L. [Member]        
Investments in associates and joint ventures        
Investments in associates   157,835 230,000  
Associates [member] | Compania Minera Coimolache S.A. [Member]        
Investments in associates and joint ventures        
Investments in associates   104,833 $ 98,426  
Associates [member] | Tinka Resources Ltd [Member]        
Investments in associates and joint ventures        
Investments in associates   $ 12,862