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Subsidiaries with material non-controlling interest (Details 3) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure Of Subsidiaries with material non-controlling interest [Line Items] |  |  |
Operating activities | $ (212,582) | $ (391,401) | $ (127,259)
Investing activities | (138,150) | (364,876) | (341,672)
Financing activities | 59,575 | (24,500) | 214,420
Increase in cash and cash equivalents in the year | 134,007 | 2,025 | 7
Sociedad Minera El Brocal S.A.A. [Member] |  |  |
Disclosure Of Subsidiaries with material non-controlling interest [Line Items] |  |  |
Operating activities | 60,525 | (9,151) | (1,523)
Investing activities | (64,343) | (37,935) | (28,375)
Financing activities | 18,096 | 48,021 | 31,867
Increase in cash and cash equivalents in the year | 14,278 | 935 | 1,969
S.M.R.L. Chaupiloma Dos de Cajamarca [Member] |  |  |
Disclosure Of Subsidiaries with material non-controlling interest [Line Items] |  |  |
Operating activities | 15,093 | 18,178 | 26,474
Investing activities | 0 | 0 | 0
Financing activities | (15,090) | (18,500) | (26,220)
Increase in cash and cash equivalents in the year | 3 | (322) | 254
Minera La Zanja S.R.L. [Member] |  |  |
Disclosure Of Subsidiaries with material non-controlling interest [Line Items] |  |  |
Operating activities | 139,155 | 11,839 | 30,743
Investing activities | (17,326) | (14,994) | (26,761)
Financing activities | (32,077) | 0 | 0
Increase in cash and cash equivalents in the year | 89,752 | (3,155) | 3,982
Apu Coropuna S.R.L. [Member] |  |  |
Disclosure Of Subsidiaries with material non-controlling interest [Line Items] |  |  |
Operating activities | (185) | (1,895) |
Investing activities | 0 | 0 |
Financing activities | 1,477 | 2,717 |
Increase in cash and cash equivalents in the year | 1,292 | 822 |
Subsidiaries with material non-controlling interests [member] |  |  |
Disclosure Of Subsidiaries with material non-controlling interest [Line Items] |  |  |
Operating activities | 214,588 | 18,971 | 55,694
Investing activities | (81,669) | (52,929) | (55,136)
Financing activities | (27,594) | 32,238 | 5,647
Increase in cash and cash equivalents in the year | $ 105,325 | $ (1,720) | $ 6,205

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