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Financial - risk management objectives and policies (Details 3) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Financial - risk management [Line Items]    
Trade accounts payable $ 48,847 $ 43,108
Total 46,166 83,991
Minera Yanacocha SRL and subsidiary [Member]    
Financial - risk management [Line Items]    
Trade accounts payable 59,693 53,070
Accounts payable to related parties 10,846 9,962
Remuneration and similar benefits payable 22,907 27,419
Total $ 82,600 $ 80,489