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Financial - risk management objectives and policies - Credit risk exposure (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Disclosure of credit risk exposure [line items]    
Trade receivables $ 226,112 $ 168,714
Trade receivables 204,096 146,701
Other receivables 182,137 115,696
Other Receivables 172,131 105,607
Expected credit loss (32,022) (32,102)
Total trade and other receivables 376,227 252,308
Minera Yanacocha SRL and subsidiary [Member]    
Disclosure of credit risk exposure [line items]    
Trade receivables 15,016 29,078
Other receivables 43,311 49,895
Other Receivables 41,927 48,511
Total trade and other receivables 42,610 55,900
Current [member]    
Disclosure of credit risk exposure [line items]    
Trade receivables 204,096 146,701
Other receivables 125,409 58,584
Expected credit loss 0 0
Total trade and other receivables 329,505 205,285
Current [member] | Minera Yanacocha SRL and subsidiary [Member]    
Disclosure of credit risk exposure [line items]    
Trade receivables   3,870
Not later than one month [member]    
Disclosure of credit risk exposure [line items]    
Trade receivables 0 0
Other receivables 42,390 44,773
Expected credit loss 0 0
Total trade and other receivables 42,390 44,773
Not later than one month [member] | Minera Yanacocha SRL and subsidiary [Member]    
Disclosure of credit risk exposure [line items]    
Trade receivables 5,047 564
Later than one month and not later than three months [member]    
Disclosure of credit risk exposure [line items]    
Trade receivables 0 0
Other receivables 4,332 2,250
Expected credit loss 0 0
Total trade and other receivables 4,332 2,250
Later than one month and not later than three months [member] | Minera Yanacocha SRL and subsidiary [Member]    
Disclosure of credit risk exposure [line items]    
Trade receivables 7,976 81
Later than three months [member]    
Disclosure of credit risk exposure [line items]    
Trade receivables 22,016 22,013
Other receivables 10,006 10,089
Expected credit loss (32,022) (32,102)
Total trade and other receivables 0 0
Later than three months [member] | Minera Yanacocha SRL and subsidiary [Member]    
Disclosure of credit risk exposure [line items]    
Trade receivables $ 1,993 $ 24,563