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Related parties (Tables) | 12 Months Ended
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Dec. 31, 2017
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, |  | December 31, |
|  | 2017 |  | 2016 |
|  | US$(000) |  | US$(000) |
Accounts receivable from related parties |  |  |  |  |  |  |
Parent Company |  |  |  |  |  |  |
FMC (a) |  |  | 372,327 |  |  | 345,609 |
Other related parties |  |  |  |  |  |  |
Sumitomo Metal Mining Company, Ltd. (b) |  |  | 19,900 |  |  | 23,552 |
Climax Molybdenum Marketing Corporation (c) |  |  | 19,570 |  |  | 6,145 |
Total accounts receivable from related parties |  |  | 411,797 |  |  | 375,306 |
Accounts payable to related parties |  |  |  |  |  |  |
Parent Company |  |  |  |  |  |  |
FMC (d) |  |  | 8,470 |  |  | 30,353 |
Other related parties |  |  |  |  |  |  |
Freeport-McMoRan Sales Company Inc. |  |  | 3,601 |  |  | 3,134 |
Minera Freeport-McMoRan South America Ltda |  |  | 1,248 |  |  | 779 |
Freeport Cobalt OY |  |  | 296 |  |  | - |
Minera Freeport-McMoRan South America S.A.C. |  |  | 66 |  |  | - |
Total accounts payable to related parties |  |  | 13,681 |  |  | 34,266 |
Less: accounts payable to related parties, long term |  |  | (8,147) |  |  | (7,132) |
Total accounts payable, short term |  |  | 5,534 |  |  | 27,134 |
| (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 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.
| (b) | 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.
| (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) from January 1, 2015 through December 31, 2020. These amounts exclude adjustments for embedded derivatives (see Note 5).
| (d) | 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.

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