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Financial risk management (Tables) | 12 Months Ended
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Dec. 31, 2017
Disclosure Of Financial risk management [Line Items] |
Disclosure of maturity analysis for non-derivative financial liabilities [text block] |
| (f) | The long-term portion of the financial obligations held by the Group matures as follows:
|  | 2017 |  | 2016 |
|  | US$(000) |  | US$(000) |
Between 1 and 2 years |  |  | 125,215 |  |  | 81,057 |
Between 2 and 5 years |  |  | 427,680 |  |  | 474,294 |
|  |  | 552,895 |  |  | 555,351 |
Debt issuance costs |  |  | (3,803) |  |  | (3,119) |
|  |  | 549,092 |  |  | 552,232 |
Sociedad Minera Cerro Verde S.A.A. [Member] |
Disclosure Of Financial risk management [Line Items] |
Disclosure of detailed information about foreign currency exchange rates risk [Text Block] | The table below summarizes the estimated impact on the Company’s profit before income tax for the year 2017 based on a 10% increase or decrease in future copper price while all other variables are held constant. The 10% increase is based on copper prices ranging from US$/pound 3.602 to US$/pound 3.627, and the 10% decrease is based on copper prices ranging from US$/pound 2.947 to US$/pound 2.967.
|  | Effect on profit before |
|  | income tax |
|  | US$(000) |
December 31, 2017 |  |  |  |
10% increase in future copper prices |  |  | 83,955 |
10% decrease in future copper prices |  |  | (83,955) |
Disclosure of maturity analysis for non-derivative financial liabilities [text block] | The following tables show the expected aging of maturity of the Company’s obligations, excluding taxes and accruals, as of December 31, 2017 and 2016:
|  | On demand |  | Less than 3 months |  | 3 to 12 months |  | 1 to 5 years |  | Total |
|  | US$(000) |  | US$(000) |  | US$(000) |  | US$(000) |  | US$(000) |
As of December 31, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Trade accounts payable |  |  | - |  |  | 194,890 |  |  | 68 |  |  | - |  |  | 194,958 |
Accounts payable - related parties |  |  | - |  |  | 5,534 |  |  | - |  |  | 8,147 |  |  | 13,681 |
Other financial liabilities |  |  | - |  |  | - |  |  | - |  |  | 1,268,488 |  |  | 1,268,488 |
Provision related to benefits to employees |  |  | - |  |  | 64,339 |  |  | 16,406 |  |  | 29,158 |  |  | 109,903 |
Other accounts payable |  |  | - |  |  | 3,374 |  |  | 36,808 |  |  | - |  |  | 40,182 |
Total |  |  | - |  |  | 268,137 |  |  | 53,282 |  |  | 1,305,793 |  |  | 1,627,212 |
As of December 31, 2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Trade accounts payable |  |  | - |  |  | 168,244 |  |  | 113 |  |  | - |  |  | 168,357 |
Accounts payable - related parties |  |  | - |  |  | 27,134 |  |  | - |  |  | 7,132 |  |  | 34,266 |
Other financial liabilities |  |  | - |  |  | - |  |  | 161 |  |  | 1,995,843 |  |  | 1,996,004 |
Provision related to benefits to employees |  |  | - |  |  | 3,807 |  |  | 44,232 |  |  | - |  |  | 48,039 |
Other accounts payable |  |  | - |  |  | 2,402 |  |  | 1,217 |  |  | - |  |  | 3,619 |
Total |  |  | - |  |  | 201,587 |  |  | 45,723 |  |  | 2,002,975 |  |  | 2,250,285 |

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