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Embedded derivatives (Tables) | 12 Months Ended
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Dec. 31, 2018
Sociedad Minera Cerro Verde S.A.A. [Member] |
Disclosure Of Embedded derivatives [Line Items] |
Disclosure of detailed information about embedded derivatives [text block] | As discussed in Note 2(d), the Company’s sales create exposure to changes in the market prices of copper and molybdenum which are considered embedded derivatives. As of December 31, 2018 and 2017, information about the Company’s embedded derivatives is as follows:
|  |  |  |  |  |  |  | As of December 31, 2018
|  | Pounds payable |  |  | Maturity |  |  | Provisional pricing |  | Forward pricing |  |  | Fair value provision |
|  | (000) |  |  |  |  |  | US$/Pound |  | US$/Pound |  |  | US$(000) |
Copper Concentrate |  |  | 261,530 |  |  |  | January 2019 to May 2019 |  |  | Between 2.675 and 2.834 |  |  | Between 2.704 and 2.708 |  |  |  | (18,848 | )
Copper Cathode |  |  | 7,711 |  |  |  | January 2019 |  |  | 2.810 |  |  | 2.704 |  |  |  | (824 | )
Molybdenum |  |  | 3,545 |  |  |  | January 2019 to February 2019 |  |  | Between 10.787 and 10.810 |  |  | 10.675 |  |  |  | (441 | )
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (20,113 | )(a)
|  |  |  |  |  |  |  | As of December 31, 2017
|  | Pounds payable |  |  | Maturity |  |  | Provisional pricing |  | Forward pricing |  |  | Fair value provision |
|  | (000) |  |  |  |  |  | US$/Pound |  | US$/Pound |  |  | US$(000) |
Copper Concentrate |  |  | 252,830 |  |  |  | January 2018 to May 2018 |  |  | Between 2.903 and 3.166 |  |  | Between 3.274 and 3.297 |  |  |  | 62,870 |
Copper Cathode |  |  | 2,756 |  |  |  | January 2018 |  |  | Between 2.970 and 3.246 |  |  | 3.274 |  |  |  | 179 |
Molybdenum |  |  | 3,340 |  |  |  | January 2018 to February 2018 |  |  | Between 7.229 and 7.231 |  |  | 8.950 |  |  |  | 5,687 |
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 68,736 | (a)
| (a) | Embedded derivative adjustments are recorded on the statement of financial position in “Trade account receivable – related parties” (US$(19.3) million as of December 31, 2018 and US$65.6 million as of December 31, 2017) and “Trade accounts receivable (net)” (US$(0.8) million as of December 31, 2018 and US$3.1 million as of December 31, 2017).

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