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Subsidiaries with material non-controlling interest - Statements of cash flow (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure Of Subsidiaries with material non-controlling interest [Line Items]      
Operating activities $ (47,065) $ (346,260) $ (212,582)
Investing activities (105,601) (117,559) (138,150)
Financing activities (100,618) (74,052) 59,575
Increase in cash and cash equivalents in the year (159,154) 154,649 134,007
Sociedad Minera El Brocal S.A.A. [Member]      
Disclosure Of Subsidiaries with material non-controlling interest [Line Items]      
Operating activities 1,545 74,985 60,525
Investing activities (28,259) (29,546) (64,343)
Financing activities (405) (29,974) 18,096
Increase in cash and cash equivalents in the year (27,119) 15,465 14,278
Minera La Zanja S.R.L. [Member]      
Disclosure Of Subsidiaries with material non-controlling interest [Line Items]      
Operating activities (908) 10,323 139,155
Investing activities (1,629) (13,160) (17,326)
Financing activities (763) 0 (32,077)
Increase in cash and cash equivalents in the year (3,300) (2,837) 89,752
S.M.R.L. Chaupiloma Dos de Cajamarca [Member]      
Disclosure Of Subsidiaries with material non-controlling interest [Line Items]      
Operating activities 16,040 14,066 15,093
Investing activities 0 0 0
Financing activities (16,250) (13,900) (15,090)
Increase in cash and cash equivalents in the year (210) 166 3
Apu Coropuna S.R.L. [Member]      
Disclosure Of Subsidiaries with material non-controlling interest [Line Items]      
Operating activities 0 (572) (185)
Investing activities 0 0 0
Financing activities 1,032 0 1,477
Increase in cash and cash equivalents in the year $ 1,032 $ (572) $ 1,292