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Investments in associates and joint venture - Statements of financial position (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Investments in associates and joint ventures        
Current assets $ 589,152 $ 648,619    
Non-current assets 3,390,465 3,458,655    
Current liabilities (360,436) (565,357)    
Non-current liabilities (819,324) (573,717)    
Shareholders' equity, net 2,799,857 2,968,200 $ 3,029,565 $ 3,063,627
Equity, adjusted 2,799,857 2,968,200 3,029,565 3,063,627
Investments in associates 1,488,775 1,488,247 1,473,382  
Minera Yanacocha S.R.L. [Member]        
Investments in associates and joint ventures        
Current assets 1,099,590 1,060,455    
Non-current assets 1,213,848 1,251,617    
Current liabilities (282,986) (190,577)    
Non-current liabilities (1,706,066) (1,631,783)    
Shareholders' equity, net 324,386 489,712    
Equity, adjusted 324,386 489,712    
Groups' interest 141,594 213,759    
Goodwill 16,241 16,241    
Investments in associates 157,835 230,000    
Sociedad Minera Cerro Verde Saa [Member]        
Investments in associates and joint ventures        
Current assets 1,754,888 1,614,928    
Non-current assets 6,012,571 6,194,496    
Current liabilities (450,680) (420,786)    
Non-current liabilities (1,681,451) (2,029,315)    
Shareholders' equity, net 5,635,328 5,359,323 5,117,732 5,189,162
Equity, adjusted 5,635,328 5,359,323 $ 5,117,732 $ 5,189,162
Groups' interest 1,101,363 1,047,596    
Goodwill 107,763 107,763    
Investments in associates $ 1,209,126 $ 1,155,359