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Intangible assets and goodwill - Useful Life and Net Value of Intangible Assets and Goodwill (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | ---
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |
Intangible assets other than goodwill | $ 155,874 | $ 166,336 | $ 179,658
Goodwill | 958 | 967 | 34,596
Total intangible assets and goodwill | 156,832 | 167,303 | 214,254
IT programs | Intangible assets other than goodwill |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |
Intangible assets other than goodwill | 3,190 | 3,249 |
Total intangible assets and goodwill | 3,190 | 3,249 | 3,447
Mining rights | Intangible assets other than goodwill |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |
Intangible assets other than goodwill | 134,924 | 140,873 |
Total intangible assets and goodwill | 134,924 | 140,873 | 149,532
Water rights and rights of way | Indefinite |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |
Intangible assets other than goodwill | 4,909 | 4,909 |
Total intangible assets and goodwill | 4,909 | 4,909 | 4,909
Water rights | Intangible assets other than goodwill |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |
Intangible assets other than goodwill | 7,580 | 11,369 |
Total intangible assets and goodwill | 7,580 | 11,369 | 15,158
Intellectual property | Intangible assets other than goodwill |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |
Intangible assets other than goodwill | 5,201 | 5,850 |
Total intangible assets and goodwill | 5,201 | 5,850 | 6,481
Other intangible assets | Intangible assets other than goodwill |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |
Intangible assets other than goodwill | 70 | 86 |
Total intangible assets and goodwill | 70 | 86 | $ 131
Goodwill |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |
Goodwill | $ 958 | $ 967 |

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