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