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Subsidiaries with material non-controlling interest - Statements of cash flow (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure Of Subsidiaries with material non-controlling interest [Line Items]      
Operating activities $ (122,885) $ (47,065) $ (346,260)
Investing activities (62,224) (105,601) (117,559)
Financing activities (35,258) (100,618) (74,052)
Increase in cash and cash equivalents in the year 25,403 (159,154) 154,649
Sociedad Minera El Brocal S.A.A      
Disclosure Of Subsidiaries with material non-controlling interest [Line Items]      
Operating activities 53,304 1,545 74,985
Investing activities (24,699) (28,259) (29,546)
Financing activities (1,954) (405) (29,974)
Increase in cash and cash equivalents in the year 26,651 (27,119) 15,465
Minera La Zanja S.R.L. [Member]      
Disclosure Of Subsidiaries with material non-controlling interest [Line Items]      
Operating activities (5,751) (908) 10,323
Investing activities (825) (1,629) (13,160)
Financing activities 0 (763) 0
Increase in cash and cash equivalents in the year (6,576) (3,300) (2,837)
S.M.R.L. Chaupiloma Dos de Cajamarca [Member]      
Disclosure Of Subsidiaries with material non-controlling interest [Line Items]      
Operating activities 13,738 16,040 14,066
Investing activities 0 0 0
Financing activities (12,850) (16,250) (13,900)
Increase in cash and cash equivalents in the year 888 (210) 166
Apu Coropuna S.R.L. [Member]      
Disclosure Of Subsidiaries with material non-controlling interest [Line Items]      
Operating activities (74) 0 (572)
Investing activities 0 0 0
Financing activities 0 1,032 0
Increase in cash and cash equivalents in the year $ (74) $ 1,032 $ (572)