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Subsidiaries with material non-controlling interest (Details 3) - USD ($)
$ in Thousands
 12 Months Ended
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