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Investments in associates (Tables) | 12 Months Ended
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Dec. 31, 2017
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 |  |  |  |  |  |  |
|  | 2017 |  | 2016 |  | 2017 |  | 2016 |
|  | % |  | % |  | US$(000) |  | US$(000) |
Sociedad Minera Cerro Verde S.A.A. |  |  | 19.584 |  |  | 19.584 |  |  | 1,124,008 |  |  | 1,055,488 |
Minera Yanacocha S.R.L. |  |  | 45.95 |  |  | 43.65 |  |  | 324,861 |  |  | 402,866 |
Compañía Minera Coimolache S.A. |  |  | 40.095 |  |  | 40.095 |  |  | 86,183 |  |  | 74,734 |
Other minor investments |  |  |  |  |  |  |  |  | 1,835 |  |  | 3,519 |
|  |  |  |  |  |  |  |  | 1,536,887 |  |  | 1,536,607 |
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:
|  | 2017 |  | 2016 |  | 2015 |
|  | US$(000) |  | US$(000) |  | US$(000) |
Minera Yanacocha S.R.L. |  |  | (76,585) |  |  | (455,598) |  |  | (196,510) |
Sociedad Minera Cerro Verde S.A.A. |  |  | 68,521 |  |  | 66,763 |  |  | 6,518 |
Compañía Minera Coimolache S.A. |  |  | 21,271 |  |  | 23,514 |  |  | 16,617 |
|  |  | 13,207 |  |  | (365,321) |  |  | (173,375) |
Minera Yanacocha S.R.L. [Member] |
Disclosure of Investments in associates [Line Items] |
Disclosure of detailed information about financial position of associate under equity method [Text Block] | The table below presents key financial data from the financial statements of Yanacocha under IFRS:
|  | 2017 |  | 2016 |
|  | US$(000) |  | US$(000) |
Statements of financial position as of December 31: |  |  |  |  |  |  |
Current assets |  |  | 1,055,135 |  |  | 1,107,893 |
Non-current assets |  |  | 964,260 |  |  | 937,992 |
Current liabilities |  |  | 123,315 |  |  | (135,136) |
Non-current liabilities |  |  | (1,236,965) |  |  | (1,025,025) |
Shareholders’ equity, reported |  |  | 659,115 |  |  | 885,724 |
Groups’ interest (45.95% in 2017 and 43.65% in 2016) |  |  | 302,863 |  |  | 386,618 |
Goodwill |  |  | 21,998 |  |  | 16,248 |
|  |  | 324,861 |  |  | 402,866 |
Disclosure of detailed information about income statement of associates [Text Block] |
|  | 2017 |  | 2016 |  | 2015 |
|  | US$(000) |  | US$(000) |  | US$(000) |
Statements of profit or loss as of December 31, |  |  |  |  |  |  |  |  |  |
Net sales |  |  | 645,176 |  |  | 761,193 |  |  | 1,031,174 |
Other operating income |  |  | 21,870 |  |  | 17,713 |  |  | 10,625 |
Costs of sales |  |  | (746,918) |  |  | (776,394) |  |  | (758,033) |
Cost of other operating income |  |  | (2,062) |  |  | (2,951) |  |  | (2,524) |
Operating expenses |  |  | (63,514) |  |  | (71,496) |  |  | (82,846) |
Administrative expenses |  |  | (4,760) |  |  | (8,780) |  |  | (20,028) |
Selling expenses |  |  | (3,921) |  |  | (3,695) |  |  | (3,534) |
Impairment loss of long-lived assets |  |  | - |  |  | (889,499) |  |  | - |
Finance income (costs) |  |  | (17,935) |  |  | (12,975) |  |  | (22,061) |
Gain (loss) from currency exchange difference |  |  | 3,636 |  |  | (13,741) |  |  | (251) |
Income (loss) before income tax |  |  | (168,428) |  |  | (1,000,625) |  |  | 152,522 |
Income tax |  |  | (7,026) |  |  | (43,127) |  |  | (602,717) |
Net loss reported |  |  | (175,454) |  |  | (1,043,752) |  |  | (450,195) |
Group’s interest (43.65%) |  |  | (76,585) |  |  | (455,598) |  |  | (196,510) |
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:
|  | 2017 |  | 2016 |
|  | US$(000) |  | US$(000) |
Statements of financial position as of December 31: |  |  |  |  |  |  |
Current assets |  |  | 1,563,874 |  |  | 1,218,508 |
Non-current assets |  |  | 6,127,133 |  |  | 6,417,115 |
Current liabilities |  |  | (510,790) |  |  | (293,631) |
Non-current liabilities |  |  | (1,991,055) |  |  | (2,502,711) |
Shareholders’ equity, reported |  |  | 5,189,162 |  |  | 4,839,281 |
Group’s interest (19.584%) |  |  | 1,016,245 |  |  | 947,725 |
Goodwill |  |  | 107,763 |  |  | 107,763 |
|  |  | 1,124,008 |  |  | 1,055,488 |
Disclosure of detailed information about income statement of associates [Text Block] |
|  | 2017 |  | 2016 |  | 2015 |
|  | US$(000) |  | US$(000) |  | US$(000) |
Statements of profit or loss for the years ended December 31: |  |  |  |  |  |  |  |  |  |
Revenue |  |  | 3,202,931 |  |  | 2,384,154 |  |  | 1,115,617 |
Cost of sales |  |  | (1,768,238) |  |  | (1,553,040) |  |  | (862,004) |
Sales expenses |  |  | (141,669) |  |  | (131,391) |  |  | (56,215) |
Other operating expenses, net |  |  | (258,826) |  |  | (24,107) |  |  | (26,600) |
Finance costs |  |  | (216,912) |  |  | (80,438) |  |  | (16,010) |
Finance income |  |  | 5,350 |  |  | 954 |  |  | 512 |
Net gain (loss) of exchange difference |  |  | 13,288 |  |  | 7,857 |  |  | (75,770) |
Profit before income taxes |  |  | 835,924 |  |  | 603,989 |  |  | 79,530 |
Income tax |  |  | (486,043) |  |  | (263,082) |  |  | (46,246) |
Net profit, reported |  |  | 349,881 |  |  | 340,907 |  |  | 33,284 |
Group’s interest (19.584%) |  |  | 68,521 |  |  | 66,763 |  |  | 6,518 |
Compania Minera Coimolache S.A. [Member] |
Disclosure of Investments in associates [Line Items] |
Disclosure of detailed information about financial position of associate under equity method [Text Block] | The table below presents the key financial data from the financial statements of Coimolache under IFRS:
|  | 2017 |  | 2016 |
|  | US$(000) |  | US$(000) |
Statements of financial position as of December 31: |  |  |  |  |  |  |
Current assets |  |  | 101,668 |  |  | 73,480 |
Non-current assets |  |  | 278,866 |  |  | 261,075 |
Current liabilities |  |  | (44,411) |  |  | (28,532) |
Non-current liabilities |  |  | (106,332) |  |  | (102,519) |
Shareholders’ equity, reported |  |  | 229,791 |  |  | 203,504 |
Adjustments to conform to the accounting policies of the Group |  |  | (14,843) |  |  | (17,111) |
Shareholders’ equity, adjusted |  |  | 214,948 |  |  | 186,393 |
Group’s interest (40.095%) |  |  | 86,183 |  |  | 74,734 |
Disclosure of detailed information about income statement of associates [Text Block] |
|  | 2017 |  | 2016 |  | 2015 |
|  | US$(000) |  | US$(000) |  | US$(000) |
Statements of profit or loss for the years ended December 31: |  |  |  |  |  |  |  |  |  |
Revenue |  |  | 203,790 |  |  | 198,873 |  |  | 177,347 |
Cost of sales |  |  | (121,021) |  |  | (107,913) |  |  | (104,549) |
Administrative expenses |  |  | (3,829) |  |  | (4,144) |  |  | (2,185) |
Sales expenses |  |  | (946) |  |  | (1,128) |  |  | (1,111) |
Other operating income (expenses), net |  |  | (587) |  |  | 755 |  |  | 765 |
Finance income |  |  | 220 |  |  | 38 |  |  | 23 |
Finance costs |  |  | (3,304) |  |  | (1,614) |  |  | (723) |
Exchange difference |  |  | (174) |  |  | (117) |  |  | (1,300) |
Profit before income taxes |  |  | 74,149 |  |  | 84,750 |  |  | 68,267 |
Income tax |  |  | (23,362) |  |  | (27,894) |  |  | (29,861) |
Net profit, reported |  |  | 50,787 |  |  | 56,856 |  |  | 38,406 |
Adjustments to conform to the accounting policies of the Group |  |  | 2,265 |  |  | 1,790 |  |  | 3,039 |
Net profit, adjusted |  |  | 53,052 |  |  | 58,646 |  |  | 41,445 |
Group’s interest (40.095%) |  |  | 21,271 |  |  | 23,514 |  |  | 16,617 |

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