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Financial - risk management objectives and policies - Credit risk exposure (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Disclosure of credit risk exposure [line items]    
Trade receivables $ 181,968 $ 226,112
Trade receivables $ 159,840 $ 204,096
Expected credit loss rate 0.00% 0.00%
Expected credit loss $ (31,845) $ (32,022)
Other receivables 183,054 182,137
Other Receivables 173,337 172,131
Total trade and other receivables 365,022 408,249
Minera Yanacocha SRL and subsidiary [Member]    
Disclosure of credit risk exposure [line items]    
Trade receivables $ 29,042 $ 16,400
Expected credit loss rate 4.77% 8.44%
Expected credit loss $ (1,384) $ (1,384)
Other receivables 34,185 43,311
Other Receivables 32,801 41,927
Total trade and other receivables 27,658 15,016
Current [member]    
Disclosure of credit risk exposure [line items]    
Trade receivables $ 159,840 $ 204,096
Expected credit loss rate 0.00% 0.00%
Expected credit loss $ 0 $ 0
Other receivables 172,116 125,409
Total trade and other receivables 331,956 329,505
Not later than one month [member]    
Disclosure of credit risk exposure [line items]    
Trade receivables $ 0 $ 0
Expected credit loss rate 0.00% 0.00%
Expected credit loss $ 0 $ 0
Other receivables 0 42,390
Total trade and other receivables 0 42,390
Not later than one month [member] | Minera Yanacocha SRL and subsidiary [Member]    
Disclosure of credit risk exposure [line items]    
Trade receivables 21,274 5,047
Total trade and other receivables 21,274 5,047
Later than one month and not later than three months [member]    
Disclosure of credit risk exposure [line items]    
Trade receivables $ 0 $ 0
Expected credit loss rate 0.00% 0.00%
Expected credit loss $ 0 $ 0
Other receivables 1,221 4,332
Total trade and other receivables 1,221 4,332
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 2,797 7,976
Total trade and other receivables 2,797 7,976
Later than three months [member]    
Disclosure of credit risk exposure [line items]    
Trade receivables $ 22,128 $ 22,016
Expected credit loss rate 100.00% 100.00%
Expected credit loss $ (31,845) $ (32,022)
Other receivables 9,717 10,006
Total trade and other receivables 31,845 32,022
Later than three months [member] | Minera Yanacocha SRL and subsidiary [Member]    
Disclosure of credit risk exposure [line items]    
Trade receivables $ 4,971 $ 3,377
Expected credit loss rate 27.84% 40.98%
Expected credit loss $ (1,384) $ (1,384)
Total trade and other receivables $ 3,587 $ 1,993