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Financial risk management (Tables) | 12 Months Ended
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Dec. 31, 2018
Disclosure Of Financial risk management [Line Items] |
Disclosure of maturity analysis for non-derivative financial liabilities [text block] |
| (e) | The long-term portion of the financial obligations held by the Group matures as follows:
|  | 2018 |  |  | 2017 |
|  | US$(000) |  |  | US$(000) |
Between 1 and 2 years |  |  | 278,397 |  |  |  | 125,215 |
Between 2 and 5 years |  |  | 266,625 |  |  |  | 427,680 |
|  |  | 545,022 |  |  |  | 552,895 |
Debt issuance costs |  |  | (4,126 | ) |  |  | (3,803 | )
|  |  | 540,896 |  |  |  | 549,092 |
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] |
|  | Effect on profit before income tax |
|  | US$(000) |
December 31, 2018 |  |  |  |
10% increase in future copper prices |  |  | 72,847 |
10% decrease in future copper prices |  |  | (72,847 | )
|  | Effect on profit before income tax |
|  | US$(000) |
December 31, 2017 |  |  |  |
10% increase in future copper prices |  |  | 83,955 |
10% decrease in future copper prices |  |  | (83,955 | )
|  | Effect on profit before income tax |
|  | US$(000) |
December 31, 2016 |  |  |  |
10% increase in future copper prices |  |  | 88,508 |
10% decrease in future copper prices |  |  | (88,508 | )
Disclosure of maturity analysis for non-derivative financial liabilities [text block] | The following tables show the expected aging of maturity of the Company’s obligations, excluding taxes and accruals, as of December 31, 2018 and 2017:
|  | On demand |  |  | Less than 3 months |  |  | 3 to 12 months |  |  | 1 to 5 years |  |  | Total |
|  | US$(000) |  |  | US$(000) |  |  | US$(000) |  |  | US$(000) |  |  | US$(000) |
As of December 31, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Trade accounts payable |  |  | - |  |  |  | 231,080 |  |  |  | 56 |  |  |  | - |  |  |  | 231,136 |
Accounts payable - related parties |  |  | - |  |  |  | 6,014 |  |  |  | - |  |  |  | 8,860 |  |  |  | 14,874 |
Other financial liabilities |  |  | - |  |  |  | - |  |  |  | - |  |  |  | 1,022,810 |  |  |  | 1,022,810 |
Provision related to benefits to employees |  |  | - |  |  |  | 24,300 |  |  |  | 18,269 |  |  |  | 32,509 |  |  |  | 75,078 |
Other accounts payable |  |  | - |  |  |  | 7,472 |  |  |  | 93,782 |  |  |  | 215,070 |  |  |  | 316,324 |
Total |  |  | - |  |  |  | 268,866 |  |  |  | 112,107 |  |  |  | 1,279,249 |  |  |  | 1,660,222 |
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 |  |  |  | 33,424 |  |  |  | 73,606 |
Total |  |  | - |  |  |  | 268,137 |  |  |  | 53,282 |  |  |  | 1,339,217 |  |  |  | 1,660,636 |

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