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Embedded derivatives (Tables) | 12 Months Ended
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Dec. 31, 2017
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, 2017 and 2016, information about the Company’s embedded derivatives is as follows:
|  |  |  |  |  | As of December 31, 2017 |
|  | Pounds |  |  |  |  |  |  |  |  |  |  |
|  | payable |  | Maturity |  | Provisional pricing |  |  | Forward pricing |  |  | Fair value provision |
|  | (000) |  |  |  | US$ |  |  | US$ |  |  | US$(000) |
Copper Concentrate |  | 252,830 |  | January 2018 to May 2018 |  | Between 2.903 and 3.166 |  |  | Between 3.274 and 3.297 |  |  | 62,870 |
Copper Cathode |  | 2,756 |  | January 2018 |  | Between 2.970 and 3.246 |  |  | 3.274 |  |  | 179 |
Molybdenum |  | 3,340 |  | January 2018 to February 2018 |  | Between 7.229 and 7.231 |  |  | 8.950 |  |  | 5,687 |
|  |  |  |  |  |  |  |  |  |  |  | 68,736 |
|  |  |  |  |  | As of December 31, 2016 |
|  | Pounds |  |  |  |  |  |  |  |  |  |
|  | payable |  | Maturity |  | Provisional pricing |  | Forward pricing |  |  | Fair value provision |
|  | (000) |  |  |  | US$ |  | US$ |  |  | US$(000) |
Copper Concentrate |  | 344,787 |  | January 2017 to May 2017 |  | Between 2.091 and 2.656 |  | Between 2.507 and 2.512 |  |  | 68,130 |
Copper Cathode |  | 7,936 |  | January 2017 |  | Between 2.488 and 2.678 |  | 2.507 |  |  | (1,000) |
Molybdenum |  | 3,455 |  | January 2017 to February 2017 |  | Between 5.431 and 5.484 |  | 5.542 |  |  | 319 |
|  |  |  |  |  |  |  |  |  |  | 67,449 |

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