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Cash and cash equivalents - Term deposit balance (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Cash and cash equivalents    
Short-term deposits, classified as cash equivalents [1] $ 50,000 $ 171,906
Minera Yanacocha SRL and subsidiary [Member]    
Cash and cash equivalents    
Short-term deposits, classified as cash equivalents 819,628 761,659
Moodys [Member] | Sociedad Minera Cerro Verde S.A.A. [Member]    
Cash and cash equivalents    
Short-term deposits, classified as cash equivalents 312,500  
Scotiabank Peru [Member]    
Cash and cash equivalents    
Short-term deposits, classified as cash equivalents 125,000  
Scotiabank Peru [Member] | Sociedad Minera Cerro Verde S.A.A. [Member]    
Cash and cash equivalents    
Short-term deposits, classified as cash equivalents 125,000  
Citibank NY [Member] | Sociedad Minera Cerro Verde S.A.A. [Member]    
Cash and cash equivalents    
Short-term deposits, classified as cash equivalents 92,300  
JP Morgan [Member] | Minera Yanacocha SRL and subsidiary [Member]    
Cash and cash equivalents    
Short-term deposits, classified as cash equivalents 404,319 501,916
Citi bank [Member] | Minera Yanacocha SRL and subsidiary [Member]    
Cash and cash equivalents    
Short-term deposits, classified as cash equivalents 215,073 214,282
Santander [Member] | Minera Yanacocha SRL and subsidiary [Member]    
Cash and cash equivalents    
Short-term deposits, classified as cash equivalents 50,114  
BNP Paribas [Member] | Minera Yanacocha SRL and subsidiary [Member]    
Cash and cash equivalents    
Short-term deposits, classified as cash equivalents 50,080 $ 45,461
Standard Chartered [Member] | Minera Yanacocha SRL and subsidiary [Member]    
Cash and cash equivalents    
Short-term deposits, classified as cash equivalents 50,031  
MUFG Bank [Member] | Minera Yanacocha SRL and subsidiary [Member]    
Cash and cash equivalents    
Short-term deposits, classified as cash equivalents $ 50,011  
[1] (c)As of December 31, 2020 and 2019, time deposits were kept in prime financial institutions, which generated interest at annual market rates and have current maturities, according to the immediate cash needs of the Group.