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Basis for preparation, consolidation and accounting policies - Impact of Adoption of IFRS 16 on consolidated statement of financial position (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Jun. 14, 2018
Dec. 31, 2017
Assets          
Mining concessions, development costs, right-of-use asset, property, plant and equipment, net $ 1,650,361 $ 1,754,372 $ 1,847,615    
Right-of-use assets 7,178 6,185      
Deferred income tax asset 73,850 74,556      
Total assets 3,979,617 4,107,274 4,217,221    
Liabilities          
Financial obligations 25,086 265,692      
Total liabilities 1,179,760 1,139,074 1,187,656    
Retained earnings 1,503,785 1,639,658      
Total shareholders' equity, net 2,799,857 2,968,200 3,029,565   $ 3,063,627
Minera Yanacocha SRL and subsidiary [Member]          
Assets          
Mining concessions, development costs, right-of-use asset, property, plant and equipment, net 1,039,579 1,038,294 840,454    
Deferred income tax asset 1,071 1,071      
Total assets 2,313,438 2,312,072      
Liabilities          
Total liabilities 1,989,052 1,822,360      
Retained earnings (32,134) 133,315      
Total shareholders' equity, net $ 324,386 $ 489,712 $ 583,723 $ 6,216 $ 659,115