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Investments in associates and joint ventures (Tables) | 12 Months Ended
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Dec. 31, 2018
Disclosure of Investments in associates [Line Items] |
Disclosure of interests in associates [text block] |
| (a) | This caption is made up as follows:
|  | Share in equity |  |  |  |  |  |  |
|  | 2018 |  |  | 2017 |  |  | 2018 |  |  | 2017 |
|  | % |  |  | % |  |  | US$(000) |  |  | US$(000) |
Associates |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sociedad Minera Cerro Verde S.A.A. |  |  | 19.58 |  |  |  | 19.58 |  |  |  | 1,108,284 |  |  |  | 1,124,008 |
Minera Yanacocha S.R.L. |  |  | 43.65 |  |  |  | 45.95 |  |  |  | 271,036 |  |  |  | 324,861 |
Compañía Minera Coimolache S.A. |  |  | 40.10 |  |  |  | 40.10 |  |  |  | 89,554 |  |  |  | 86,183 |
|  |  |  |  |  |  |  |  |  |  | 1,468,874 |  |  |  | 1,535,052 |
Other minor investments |  |  |  |  |  |  |  |  |  |  | 1,835 |  |  |  | 1,835 |
Joint ventures |  |  |  |  |  |  |  |  |  |  | 2,673 |  |  |  | - |
|  |  |  |  |  |  |  |  |  |  | 1,473,382 |  |  |  | 1,536,887 |
Disclosure of detailed information about the net share in profit loss of associates [Text Block] |
| (b) | The table below presents the net share in profit (loss) of associates:
|  | 2018 |  |  | 2017 |  |  | 2016 |
|  | US$(000) |  |  | US$(000) |  |  | US$(000) |
Minera Yanacocha S.R.L. |  |  | (35,582 | ) |  |  | (76,585 | ) |  |  | (455,598 | )
Sociedad Minera Cerro Verde S.A.A. |  |  | 23,444 |  |  |  | 68,521 |  |  |  | 66,763 |
Compañía Minera Coimolache S.A. |  |  | 10,994 |  |  |  | 21,271 |  |  |  | 23,514 |
|  |  | (1,144 | ) |  |  | 13,207 |  |  |  | (365,321 | )
Minera Yanacocha S.R.L. [Member] |
Disclosure of Investments in associates [Line Items] |
Disclosure of detailed information about financial position of associate under equity method [Text Block] | The table below presents key financial data from the financial statements of Yanacocha under IFRS:
|  | 2018 |  |  | 2017 |
|  | US$(000) |  |  | US$(000) |
Statements of financial position as of December 31: |  |  |  |  |  |  |  |
Current assets |  |  | 960,758 |  |  |  | 1,055,135 |
Non-current assets |  |  | 1,086,714 |  |  |  | 964,260 |
Current liabilities |  |  | (128,170 | ) |  |  | (123,315 | )
Non-current liabilities |  |  | (1,335,579 | ) |  |  | (1,236,965 | )
Shareholders’ equity, reported |  |  | 583,723 |  |  |  | 659,115 |
Groups’ interest |  |  | 254,795 |  |  |  | 302,863 |
Goodwill |  |  | 16,241 |  |  |  | 21,998 |
|  |  | 271,036 |  |  |  | 324,861 |
Disclosure of detailed information about income statement of associates [Text Block] |
|  | 2018 |  |  | 2017 |  |  | 2016 |
|  | US$(000) |  |  | US$(000) |  |  | US$(000) |
Statements of profit or loss for the years ended December 31: |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  | 657,358 |  |  |  | 645,176 |  |  |  | 761,193 |
Net loss from continued operations |  |  | (81,517 | ) |  |  | (175,454 | ) |  |  | (1,043,752 | )
Share in results |  |  | (35,582 | ) |  |  | (76,585 | ) |  |  | (455,598 | )
Sociedad Minera Cerro Verde S.A.A. [Member] |
Disclosure of Investments in associates [Line Items] |
Disclosure of detailed information about financial position of associate under equity method [Text Block] | The table below presents the key financial data from the financial statements of Cerro Verde under IFRS:
|  | 2018 |  |  | 2017 |
|  | US$(000) |  |  | US$(000) |
Statements of financial position as of December 31: |  |  |  |  |  |  |  |
Current assets |  |  | 1,485,537 |  |  |  | 1,563,874 |
Non-current assets |  |  | 6,069,175 |  |  |  | 6,127,133 |
Current liabilities |  |  | (408,754 | ) |  |  | (510,790 | )
Non-current liabilities |  |  | (2,037,086 | ) |  |  | (1,991,055 | )
Shareholders’ equity, reported |  |  | 5,108,872 |  |  |  | 5,189,162 |
Group’s interest |  |  | 1,000,521 |  |  |  | 1,016,245 |
Goodwill |  |  | 107,763 |  |  |  | 107,763 |
|  |  | 1,108,284 |  |  |  | 1,124,008 |
Disclosure of detailed information about income statement of associates [Text Block] |
|  | 2018 |  |  | 2017 |  |  | 2016 |
|  | US$(000) |  |  | US$(000) |  |  | US$(000) |
Statements of profit or loss for the years ended December 31: |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  | 3,054,026 |  |  |  | 3,202,931 |  |  |  | 2,384,154 |
Net income from continued operations |  |  | 119,710 |  |  |  | 349,881 |  |  |  | 340,907 |
Share in results |  |  | 23,444 |  |  |  | 68,521 |  |  |  | 66,763 |
Compania Minera Coimolache S.A. [Member] |
Disclosure of Investments in associates [Line Items] |
Disclosure of detailed information about financial position of associate under equity method [Text Block] | The table below presents the key financial data from the financial statements of Coimolache under IFRS:
|  | 2018 |  |  | 2017 |
|  | US$(000) |  |  | US$(000) |
Statements of financial position as of December 31: |  |  |  |  |  |  |  |
Current assets |  |  | 99,887 |  |  |  | 101,668 |
Non-current assets |  |  | 261,782 |  |  |  | 278,866 |
Current liabilities |  |  | (39,204 | ) |  |  | (44,411 | )
Non-current liabilities |  |  | (86,103 | ) |  |  | (106,332 | )
Shareholders’ equity, reported |  |  | 236,362 |  |  |  | 229,791 |
Adjustments to conform to the accounting policies of the Group |  |  | (13,003 | ) |  |  | (14,843 | )
Shareholders’ equity, adjusted |  |  | 223,359 |  |  |  | 214,948 |
Group’s interest |  |  | 89,554 |  |  |  | 86,183 |
Disclosure of detailed information about income statement of associates [Text Block] |
|  | 2018 |  |  | 2017 |  |  | 2016 |
|  | US$(000) |  |  | US$(000) |  |  | US$(000) |
Statements of profit or loss for the years ended December 31: |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  | 225,447 |  |  |  | 203,790 |  |  |  | 198,873 |
Net income from continued operations |  |  | 25,584 |  |  |  | 50,787 |  |  |  | 56,856 |
Adjustments to conform to the accounting policies |  |  | 1,837 |  |  |  | 2,265 |  |  |  | 1,790 |
Net income, adjusted |  |  | 27,421 |  |  |  | 53,052 |  |  |  | 58,646 |
Share in results |  |  | 10,994 |  |  |  | 21,271 |  |  |  | 23,514 |

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