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Intangible assets and goodwill - Movements in Identifiable Intangible Assets (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |
Opening balance | $ 167,303 | $ 214,254
Additions | 408 | 1,504
Amortization for the year | (10,601) | (13,845)
Impairment losses recognized in income for the year | (9) | (34,857)
Other increases / decreases for foreign currency exchange rates | 3 | (159)
Other increases (decreases) | (272) | 406
Subtotal | (10,471) | (46,951)
Closing balance | 156,832 | 167,303
Indefinite | Goodwill |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |
Opening balance | 967 | 34,596
Additions | 0 | 0
Impairment losses recognized in income for the year | (9) | (33,629)
Other increases / decreases for foreign currency exchange rates | 0 | 0
Other increases (decreases) | 0 | 0
Subtotal | (9) | (33,629)
Closing balance | 958 | 967
Historical cost |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |
Opening balance | 238,600 |
Closing balance | 238,730 | 238,600
Historical cost | Indefinite | Goodwill |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |
Opening balance | 4,501 |
Closing balance | 4,492 | 4,501
Accumulated amortization |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |
Opening balance | (71,297) |
Closing balance | (81,898) | (71,297)
Accumulated amortization | Indefinite | Goodwill |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |
Opening balance | (3,534) |
Closing balance | (3,534) | (3,534)
IT programs | Intangible assets other than goodwill |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |
Opening balance | 3,249 | 3,447
Additions | 197 | 349
Amortization for the year | (1,451) | (1,039)
Impairment losses recognized in income for the year | 0 | 0
Other increases / decreases for foreign currency exchange rates | 6 | (4)
Other increases (decreases) | 1,189 | 496
Subtotal | (59) | (198)
Closing balance | 3,190 | 3,249
IT programs | Historical cost | Intangible assets other than goodwill |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |
Opening balance | 36,457 |
Closing balance | 37,849 | 36,457
IT programs | Accumulated amortization | Intangible assets other than goodwill |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |
Opening balance | (33,208) |
Closing balance | (34,659) | (33,208)
Mining rights | Intangible assets other than goodwill |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |
Opening balance | 140,873 | 149,532
Additions | 196 | 1,141
Amortization for the year | (4,684) | (8,482)
Impairment losses recognized in income for the year | 0 | (1,228)
Other increases / decreases for foreign currency exchange rates | 0 | 0
Other increases (decreases) | (1,461) | (90)
Subtotal | (5,949) | (8,659)
Closing balance | 134,924 | 140,873
Mining rights | Historical cost | Intangible assets other than goodwill |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |
Opening balance | 162,716 |
Closing balance | 161,451 | 162,716
Mining rights | Accumulated amortization | Intangible assets other than goodwill |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |
Opening balance | (21,843) |
Closing balance | (26,527) | (21,843)
Water rights and rights of way | Indefinite |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |
Opening balance | 4,909 | 4,909
Additions | 0 | 0
Impairment losses recognized in income for the year | 0 | 0
Other increases / decreases for foreign currency exchange rates | 0 | 0
Other increases (decreases) | 0 | 0
Subtotal | 0 | 0
Closing balance | 4,909 | 4,909
Water rights and rights of way | Historical cost | Indefinite |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |
Opening balance | 7,420 |
Closing balance | 7,420 | 7,420
Water rights and rights of way | Accumulated amortization | Indefinite |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |
Opening balance | (2,511) |
Closing balance | (2,511) | (2,511)
Water rights | Intangible assets other than goodwill |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |
Opening balance | 11,369 | 15,158
Additions | 0 | 0
Amortization for the year | (3,789) | (3,789)
Impairment losses recognized in income for the year | 0 | 0
Other increases / decreases for foreign currency exchange rates | 0 | 0
Other increases (decreases) | 0 | 0
Subtotal | (3,789) | (3,789)
Closing balance | 7,580 | 11,369
Water rights | Historical cost | Intangible assets other than goodwill |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |
Opening balance | 18,000 |
Closing balance | 18,000 | 18,000
Water rights | Accumulated amortization | Intangible assets other than goodwill |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |
Opening balance | (6,631) |
Closing balance | (10,420) | (6,631)
Intellectual property | Intangible assets other than goodwill |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |
Opening balance | 5,850 | 6,481
Additions | 0 | 0
Amortization for the year | (649) | (476)
Impairment losses recognized in income for the year | 0 | 0
Other increases / decreases for foreign currency exchange rates | 0 | (155)
Other increases (decreases) | 0 | 0
Subtotal | (649) | (631)
Closing balance | 5,201 | 5,850
Intellectual property | Historical cost | Intangible assets other than goodwill |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |
Opening balance | 7,215 |
Closing balance | 7,215 | 7,215
Intellectual property | Accumulated amortization | Intangible assets other than goodwill |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |
Opening balance | (1,365) |
Closing balance | (2,014) | (1,365)
Other intangible assets | Intangible assets other than goodwill |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |
Opening balance | 86 | 131
Additions | 15 | 14
Amortization for the year | (28) | (59)
Impairment losses recognized in income for the year | 0 | 0
Other increases / decreases for foreign currency exchange rates | (3) | 0
Other increases (decreases) | 0 | 0
Subtotal | (16) | (45)
Closing balance | 70 | 86
Other intangible assets | Historical cost | Intangible assets other than goodwill |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |
Opening balance | 2,291 |
Closing balance | 2,303 | 2,291
Other intangible assets | Accumulated amortization | Intangible assets other than goodwill |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |
Opening balance | (2,205) |
Closing balance | $ (2,233) | $ (2,205)

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