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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, 2019
Jan. 01, 2019
Dec. 31, 2018
Jun. 14, 2018
Dec. 31, 2017
Dec. 31, 2016
Assets            
Mining concessions, development costs, right-of-use asset, property, plant and equipment, net $ 1,754,372   $ 1,847,615   $ 1,949,555  
Right-of-use assets 6,185          
Deferred income tax asset, net 74,556   38,305      
Total assets 4,107,274   4,217,221   4,332,813  
Liabilities            
Financial obligations 265,692   46,166      
Total liabilities 1,139,074   1,187,656   1,269,186  
Retained earnings 1,639,658   1,675,909      
Total shareholders' equity, net 2,968,200   3,029,565   3,063,627 $ 3,047,213
IFRS 16 [Member]            
Assets            
Mining concessions, development costs, right-of-use asset, property, plant and equipment, net 6,185 $ 18,528        
Deferred income tax asset, net 390 400        
Total assets 6,575 18,928        
Liabilities            
Financial obligations 7,503 19,885        
Total liabilities 7,503 19,885        
Retained earnings (928) (957)        
Total shareholders' equity, net (928) (957)        
Minera Yanacocha SRL and subsidiary [Member]            
Assets            
Mining concessions, development costs, right-of-use asset, property, plant and equipment, net 1,038,294   840,454   855,881  
Deferred income tax asset, net 1,071   1,071      
Total assets 2,312,072   2,047,472      
Liabilities            
Total liabilities 1,822,360   1,463,749      
Retained earnings 133,315   228,572      
Total shareholders' equity, net 489,712   $ 583,723 $ 6,216 $ 659,115 $ 885,724
Minera Yanacocha SRL and subsidiary [Member] | IFRS 16 [Member]            
Assets            
Right-of-use assets 584 342        
Total assets 584 342        
Liabilities            
Provisions and other accruals 596 362        
Total liabilities $ 596 $ 362