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Subsidiaries with material non-controlling interest - Statements of cash flow (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure Of Subsidiaries with material non-controlling interest [Line Items]      
Operating activities $ 197,510 $ (142,434) $ (69,076)
Investing activities (86,287) (62,224) (105,601)
Financing activities 425,347 (54,807) (122,629)
Increase in cash and cash equivalents in the year 141,550 25,403 (159,154)
Sociedad Minera El Brocal S.A.A      
Disclosure Of Subsidiaries with material non-controlling interest [Line Items]      
Operating activities 104,858 53,304 1,545
Investing activities (37,618) (24,699) (28,259)
Financing activities (57,176) (1,954) (405)
Increase in cash and cash equivalents in the year 10,064 26,651 (27,119)
Minera La Zanja S.R.L. [Member]      
Disclosure Of Subsidiaries with material non-controlling interest [Line Items]      
Operating activities (50,647) (5,751) (908)
Investing activities (998) (825) (1,629)
Financing activities 0 0 (763)
Increase in cash and cash equivalents in the year (51,645) (6,576) (3,300)
S.M.R.L. Chaupiloma Dos de Cajamarca      
Disclosure Of Subsidiaries with material non-controlling interest [Line Items]      
Operating activities 10,838 13,738 16,040
Investing activities 0 0 0
Financing activities (11,900) (12,850) (16,250)
Increase in cash and cash equivalents in the year (1,062) 888 (210)
Apu Coropuna S.R.L. [Member]      
Disclosure Of Subsidiaries with material non-controlling interest [Line Items]      
Operating activities (1,227) (74) 0
Investing activities 0 0 0
Financing activities 0 0 1,032
Increase in cash and cash equivalents in the year $ (1,227) $ (74) $ 1,032