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Mining royalties (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure Of Mining Royalties [Line Items] |  |  |
Royalty Expense | $ 11,749 | $ 12,832 | $ 21,388
Sindicato Minero de Orcopampa S.A., note 29(b) [Member] |  |  |
Disclosure Of Mining Royalties [Line Items] |  |  |
Royalty Expense | 6,180 | 4,741 | 12,122
Royalties paid to the Peruvian State [Member] |  |  |
Disclosure Of Mining Royalties [Line Items] |  |  |
Royalty Expense | $ 5,569 | $ 8,091 | $ 9,266

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