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Related parties (Tables) | 12 Months Ended
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Dec. 31, 2018
Sociedad Minera Cerro Verde S.A.A. [Member] |
Disclosure Of Related Parties [Line Items] |
Disclosure of transactions between related parties [text block] | Accounts receivable from related parties and accounts payable to related parties are made up as follows:
|  | December 31 , 2018 |  |  | December 31 , 2017 |
|  | US$(000) |  |  | US$(000) |
Accounts receivable from related parties |  |  |  |  |  |  |  |
Parent Company |  |  |  |  |  |  |  |
FMC (a) |  |  | 409,688 |  |  |  | 372,327 |
Other related parties |  |  |  |  |  |  |  |
Sumitomo Metal Mining Company, Ltd. (b) |  |  | 12,918 |  |  |  | 19,900 |
Climax Molybdenum Marketing Corporation (c) |  |  | 10,038 |  |  |  | 19,570 |
Embedded derivatives |  |  |  |  |  |  |  |
Embedded derivatives (d) |  |  | (19,293 | ) |  |  | 65,622 |
Total accounts receivable from related parties |  |  | 413,351 |  |  |  | 477,419 |
Classification by measurement |  |  |  |  |  |  |  |
Accounts receivables from related parties (not subject to provisional pricing) |  |  | 67,050 |  |  |  | 2,305 |
Accounts receivables from related parties (subject to provisional pricing) |  |  | 365,594 |  |  |  | 409,492 |
Embedded derivatives (d) |  |  | (19,293 | ) |  |  | 65,622 |
|  |  | 413,351 |  |  |  | 477,419 |
Accounts payable to related parties |  |  |  |  |  |  |  |
Parent Company |  |  |  |  |  |  |  |
FMC (e) |  |  | 8,860 |  |  |  | 8,470 |
Other related parties |  |  |  |  |  |  |  |
Freeport-McMoRan Sales Company Inc. |  |  | 3,192 |  |  |  | 3,601 |
PT Freeport Indonesia |  |  | 2,301 |  |  |  | - |
Minera Freeport-McMoRan South America Ltda |  |  | 521 |  |  |  | 1,248 |
Freeport Cobalt OY |  |  | - |  |  |  | 296 |
Minera Freeport-McMoRan South America S.A.C. |  |  | - |  |  |  | 66 |
Total accounts payable to related parties |  |  | 14,874 |  |  |  | 13,681 |
Less: accounts payable to related parties, long term |  |  | (8,860 | ) |  |  | (8,147 | )
Total accounts payable, short term |  |  | 6,014 |  |  |  | 5,534 |
| (a) | 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.
| (b) | 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.
| (c) | 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) through December 31, 2020.
| (d) | Reflects the embedded derivative adjustment of US$(19.3) million as of December 31, 2018, and US$65.6 million as of December 31, 2017, associated with accounts receivable from related parties (See Note 2(d) and 22).
| (e) | Accounts payable to FMC as of December 31, 2018, is related to stock option benefits for US$8.9 million (US$8.1 as of December 31, 2017).

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