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Intangible assets and goodwill - Useful Life and Net Value of Intangible Assets and Goodwill (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | --- | ---
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |
Intangible assets other than goodwill | $ 167,968 | $ 155,874 | $ 166,336
Goodwill | 948 | 958 | 967
Total intangible assets and goodwill | 168,916 | 156,832 | 167,303
IT programs | Intangible assets other than goodwill |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |
Intangible assets other than goodwill | 8,430 | 3,190 |
Total intangible assets and goodwill | 8,430 | 3,190 | 3,249
Mining rights | Intangible assets other than goodwill |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |
Intangible assets other than goodwill | 133,119 | 134,924 |
Total intangible assets and goodwill | 133,119 | 134,924 | 140,873
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 | 3,791 | 7,580 |
Total intangible assets and goodwill | 3,791 | 7,580 | 11,369
Intellectual property | Intangible assets other than goodwill |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |
Intangible assets other than goodwill | 14,761 | 5,201 |
Total intangible assets and goodwill | 14,761 | 5,201 | 5,850
Other intangible assets | Intangible assets other than goodwill |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |
Intangible assets other than goodwill | 2,958 | 70 |
Total intangible assets and goodwill | 2,958 | 70 | $ 86
Goodwill |  |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |  |
Goodwill | $ 948 | $ 958 |

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