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Tax situation (Details 2) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Deferred income tax assets, net    
Deferred tax assets $ 43,129 $ 25,881
Minera Yanacocha SRL and subsidiary [Member]    
Deferred income tax assets, net    
Deferred tax assets 947,802 896,842
Allowance of deferred income tax asset (947,802) (896,842)
Net deferred income tax asset 0 0
Minera Yanacocha SRL and subsidiary [Member] | Property, plant and mine development [Member]    
Deferred income tax assets, net    
Deferred tax assets 571,210 608,783
Minera Yanacocha SRL and subsidiary [Member] | Reclamation [Member]    
Deferred income tax assets, net    
Deferred tax assets 233,843 160,261
Minera Yanacocha SRL and subsidiary [Member] | Accounts payable and accrued expenses [Member]    
Deferred income tax assets, net    
Deferred tax assets 78,241 64,703
Minera Yanacocha SRL and subsidiary [Member] | Inventory [Member]    
Deferred income tax assets, net    
Deferred tax assets 61,435 60,018
Minera Yanacocha SRL and subsidiary [Member] | Other [Member]    
Deferred income tax assets, net    
Deferred tax assets $ 3,073 $ 3,077