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Related parties (Details) - Sociedad Minera Cerro Verde S.A.A. [Member] - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Balances receivable from related parties [Abstract] |  |  |
Amounts receivable, related party transactions |  | $ 411,797 | $ 375,306
Balances payable to related parties [Abstract] |  |  |
Amounts payable, related party transactions |  | 13,681 | 34,266
Accounts payable - Related parties |  | (8,147) | (7,132)
Accounts payable to related parties |  | 5,534 | 27,134
Freeport Minerals Corporation [Member] |  |  |
Balances receivable from related parties [Abstract] |  |  |
Amounts receivable, related party transactions | [1] | 372,327 | 345,609
Balances payable to related parties [Abstract] |  |  |
Amounts payable, related party transactions | [2] | 8,470 | 30,353
Sumitomo Metal Mining Company, Ltd. [Member] |  |  |
Balances receivable from related parties [Abstract] |  |  |
Amounts receivable, related party transactions | [3] | 19,900 | 23,552
Climax Molybdenum Marketing Corporation [Member] |  |  |
Balances receivable from related parties [Abstract] |  |  |
Amounts receivable, related party transactions | [4] | 19,570 | 6,145
Freeport-McMoRan Sales Company Inc. [Member] |  |  |
Balances payable to related parties [Abstract] |  |  |
Amounts payable, related party transactions |  | 3,601 | 3,134
Minera Freeport-McMoRan South America Ltda [Member] |  |  |
Balances payable to related parties [Abstract] |  |  |
Amounts payable, related party transactions |  | 1,248 | 779
Freeport Cobalt OY [Member] |  |  |
Balances payable to related parties [Abstract] |  |  |
Amounts payable, related party transactions |  | 296 | 0
Minera Freeport-McMoRan South America S.A.C. [Member] |  |  |
Balances payable to related parties [Abstract] |  |  |
Amounts payable, related party transactions |  | $ 66 | $ 0
[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 from January 1, 2017 to December 31, 2021. These amounts exclude adjustments for embedded derivatives (see Note 5). Terms of the contracts are reviewed annually.
[2] | Accounts payable to FMC as of December 31, 2017, is related to stock option benefits for US$8.1 million. The balance as of December 31, 2016, includes US$22.3 million for the purchase of used shovels and US$7.1 million of stock option benefits.
[3] | The Company has a long-term agreement with Sumitomo through which it has committed to sell 21% of its annual copper concentrates production from January 1, 2017 to December 31, 2021. These amounts exclude adjustments for embedded derivatives (see Note 5). Terms of the contracts are reviewed annually.
[4] | 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 the Metals Week Dealer Oxide price and under a delivery type known as CIF (cost, insurance and freight) from January 1, 2015 through December 31, 2020. These amounts exclude adjustments for embedded derivatives (see Note 5).

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