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Related parties (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Freeport Minerals Corporation [Member]    
Balances payable to related parties [Abstract]    
Amounts payable, related party transactions $ (10,441) $ (8,860)
Freeport-McMoRan Sales Company Inc. [Member]    
Balances payable to related parties [Abstract]    
Amounts payable, related party transactions (3,086) (3,192)
Minera Freeport-McMoRan South America Ltda [Member]    
Balances payable to related parties [Abstract]    
Amounts payable, related party transactions (561) (521)
Freeport Cobalt OY [Member]    
Balances payable to related parties [Abstract]    
Amounts payable, related party transactions 0 (2,301)
Sociedad Minera Cerro Verde S.A.A. [Member]    
Balances receivable from related parties [Abstract]    
Amounts receivable, related party transactions 453,070 413,351
Balances payable to related parties [Abstract]    
Amounts payable, related party transactions (14,088) (14,874)
Accounts payable - Related parties 10,074 8,860
Accounts payable to related parties 4,014 6,014
Sociedad Minera Cerro Verde S.A.A. [Member] | Accounts Receivables Non Provisional Pricing [Member]    
Balances receivable from related parties [Abstract]    
Amounts receivable, related party transactions 121,995 67,050
Sociedad Minera Cerro Verde S.A.A. [Member] | Accounts Receivables Provisional Pricing [Member]    
Balances receivable from related parties [Abstract]    
Amounts receivable, related party transactions 294,998 365,594
Sociedad Minera Cerro Verde S.A.A. [Member] | Freeport Minerals Corporation [Member]    
Balances receivable from related parties [Abstract]    
Amounts receivable, related party transactions [1] 401,211 409,688
Sociedad Minera Cerro Verde S.A.A. [Member] | Sumitomo Metal Mining Company, Ltd. [Member]    
Balances receivable from related parties [Abstract]    
Amounts receivable, related party transactions [2] 10,760 12,918
Sociedad Minera Cerro Verde S.A.A. [Member] | Climax Molybdenum Marketing Corporation [Member]    
Balances receivable from related parties [Abstract]    
Amounts receivable, related party transactions [3] 5,022 10,038
Sociedad Minera Cerro Verde S.A.A. [Member] | Embedded derivatives [Member]    
Balances receivable from related parties [Abstract]    
Amounts receivable, related party transactions [4] $ 36,077  
Balances payable to related parties [Abstract]    
Amounts payable, related party transactions [4]   $ (19,293)
[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 contracts 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 concentrates production through December 31, 2021. Terms of the contracts are reviewed annually.
[3] The Company has a 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) through December 31, 2020.
[4] Reflects the embedded derivative adjustment associated with accounts receivable from related parties (See Note 2(d) and 22).