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Related parties (Details) - Sociedad Minera Cerro Verde S.A.A. [Member] - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Balances receivable from related parties [Abstract]    
Amounts receivable, related party transactions $ 594,409 $ 453,070
Balances payable to related parties [Abstract]    
Total accounts payable, short term 3,446 4,014
Accounts Receivables Non Provisional Pricing [Member]    
Balances receivable from related parties [Abstract]    
Amounts receivable, related party transactions 116,740 121,995
Accounts Receivables Provisional Pricing [Member]    
Balances receivable from related parties [Abstract]    
Amounts receivable, related party transactions 376,235 294,998
Freeport Minerals Corporation [Member]    
Balances receivable from related parties [Abstract]    
Amounts receivable, related party transactions [1] 462,304 401,211
Balances payable to related parties [Abstract]    
Amounts payable to related parties 0 367
Sumitomo Metal Mining Company, Ltd. [Member]    
Balances receivable from related parties [Abstract]    
Amounts receivable, related party transactions [2] 16,352 10,760
Climax Molybdenum Marketing Corporation [Member]    
Balances receivable from related parties [Abstract]    
Amounts receivable, related party transactions [3] 14,319 5,022
Freeport-McMoRan Sales Company Inc. [Member]    
Balances payable to related parties [Abstract]    
Amounts payable to related parties 2,883 3,086
Minera Freeport-McMoRan South America Ltda [Member]    
Balances payable to related parties [Abstract]    
Amounts payable to related parties 402 561
Freeport Cobalt OY [Member]    
Balances payable to related parties [Abstract]    
Amounts payable to related parties 161 0
Embedded derivatives [Member]    
Balances receivable from related parties [Abstract]    
Amounts receivable, related party transactions [4] $ 101,434 $ 36,077
[1] Accounts receivable from FMC mainly correspond to sales of copper concentrate and copper cathode. The Company has a long-term agreement with FMC through which it has committed to sell between 70% and 80% of its annual copper concentrate production through December 31, 2021. Terms of the contract are reviewed annually.
[2] The Company has a long-term agreement with Sumitomo through which it has committed to sell 21% of its annual copper concentrate production through December 31, 2021. Terms of the contract are reviewed annually.
[3] The Company has a new long-term agreement with Climax Molybdenum Marketing Corporation (a wholly owned subsidiary of FMC) through which it has committed to sell 100% of its annual molybdenum concentrate production, at a price based on MWDO and under a delivery type known as CIF (cost, insurance and freight) from February 1, 2020, through January 31, 2022.
[4] Reflects the embedded derivative adjustment associated with accounts receivable from related parties (see Note 2(d) and 21).