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Subsidiaries with material non-controlling interest (Details 3) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disclosure Of Subsidiaries with material non-controlling interest [Line Items] |  |  |
Operating activities | $ (346,260) | $ (212,582) | $ (391,401)
Investing activities | (117,559) | (138,150) | (364,876)
Financing activities | (74,052) | 59,575 | (24,500)
Increase in cash and cash equivalents in the year | 154,649 | 134,007 | 2,025
Sociedad Minera El Brocal S.A.A. [Member] |  |  |
Disclosure Of Subsidiaries with material non-controlling interest [Line Items] |  |  |
Operating activities | 74,985 | 60,525 | (9,151)
Investing activities | (29,546) | (64,343) | (37,935)
Financing activities | (29,974) | 18,096 | 48,021
Increase in cash and cash equivalents in the year | 15,465 | 14,278 | 935
S.M.R.L. Chaupiloma Dos de Cajamarca [Member] |  |  |
Disclosure Of Subsidiaries with material non-controlling interest [Line Items] |  |  |
Operating activities | 14,066 | 15,093 | 18,178
Investing activities | 0 | 0 | 0
Financing activities | (13,900) | (15,090) | (18,500)
Increase in cash and cash equivalents in the year | 166 | 3 | (322)
Minera La Zanja S.R.L. [Member] |  |  |
Disclosure Of Subsidiaries with material non-controlling interest [Line Items] |  |  |
Operating activities | 10,323 | 139,155 | 11,839
Investing activities | (13,160) | (17,326) | (14,994)
Financing activities | 0 | (32,077) | 0
Increase in cash and cash equivalents in the year | (2,837) | 89,752 | (3,155)
Apu Coropuna S.R.L. [Member] |  |  |
Disclosure Of Subsidiaries with material non-controlling interest [Line Items] |  |  |
Operating activities | (572) | (185) | (1,895)
Investing activities | 0 | 0 | 0
Financing activities | 0 | 1,477 | 2,717
Increase in cash and cash equivalents in the year | $ (572) | $ 1,292 | $ 822

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