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Basis for preparation, consolidation and accounting policies - Reconciliation between the balance of assets and liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
Disclosure of basis for preparation, consolidation and accounting policies [Line Items]      
Operating lease commitments disclosed as of December 31, 2018     $ 7,330
New operating leases commitments under IFRS 16   $ 16,221  
Short-term leases not recognized as a liability   (547)  
Low-value leases not recognized as a liability   (3,119)  
Additional lease liability recognized as of January 1, 2019   19,885  
Plus: Lease liability already recognized as of December 31, 2018   241,653  
Total lease liabilities $ 7,503 261,538  
Minera Yanacocha SRL and subsidiary [Member] | IFRS 16 [Member]      
Disclosure of basis for preparation, consolidation and accounting policies [Line Items]      
Operating lease commitments disclosed as of December 31, 2018     450
Short-term leases not recognized as a liability $ (88)    
Additional lease liability recognized as of January 1, 2019   362  
Total lease liabilities   362  
Sociedad Minera Cerro Verde S.A.A. [Member]      
Disclosure of basis for preparation, consolidation and accounting policies [Line Items]      
Operating lease commitments disclosed as of December 31, 2018     $ 152,866
Contracts that do not meet the revised definition of a lease   (25,851)  
Effect of discounting   (31,287)  
Total lease liabilities   $ 95,728