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Tax situation (Details 1) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Deferred income tax assets, net    
Deferred tax assets $ 38,305 $ 43,129
Minera Yanacocha SRL and subsidiary [Member]    
Deferred income tax assets, net    
Deferred tax assets 972,395 947,802
Allowance of deferred income tax asset (971,324) (947,802)
Net deferred income tax asset 1,071 0
Minera Yanacocha SRL and subsidiary [Member] | Property, plant and mine development [Member]    
Deferred income tax assets, net    
Deferred tax assets 514,828 571,210
Minera Yanacocha SRL and subsidiary [Member] | Reclamation [Member]    
Deferred income tax assets, net    
Deferred tax assets 301,492 233,843
Minera Yanacocha SRL and subsidiary [Member] | Accounts payable and accrued expenses [Member]    
Deferred income tax assets, net    
Deferred tax assets 92,610 78,241
Minera Yanacocha SRL and subsidiary [Member] | Inventory [Member]    
Deferred income tax assets, net    
Deferred tax assets 62,363 61,435
Minera Yanacocha SRL and subsidiary [Member] | Other [Member]    
Deferred income tax assets, net    
Deferred tax assets $ 1,102 $ 3,073