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Property, plant and equipment - Summary of property, plant and equipment (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance $ 3,755,559 $ 3,596,262
Capitalized interest 33,839 17,087
Ending balance 4,118,782 3,755,559
Land and buildings    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 146,343 153,697
Ending balance 153,286 146,343
Plant and equipment    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 1,224,926 1,227,606
Ending balance 1,170,824 1,224,926
Capital works in progress    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 112,543 123,605
Ending balance 119,165 112,543
Mineral properties    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 2,032,672 1,852,376
Ending balance 2,436,418 2,032,672
Pre-development properties    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 239,075 238,978
Ending balance 239,089 239,075
Cost    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 7,419,814 6,985,213
Additions/transfers 622,120 429,505
(Write-down) reversal of assets (3,508) (3,183)
Other movements/transfers (11,475) (4,471)
Assets reclassified as held for sale 1,217 217
Disposals (2,772) (4,554)
Capitalized interest 33,839 17,087
Ending balance 8,059,235 7,419,814
Cost | Land and buildings    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 257,480 243,332
Additions/transfers 4,903 2,034
(Write-down) reversal of assets (1,403) 0
Other movements/transfers 21,446 12,311
Assets reclassified as held for sale 0 0
Disposals 0 (197)
Capitalized interest 0 0
Ending balance 282,426 257,480
Cost | Plant and equipment    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 2,764,413 2,623,733
Additions/transfers 40,339 43,352
(Write-down) reversal of assets 523 0
Other movements/transfers 70,740 100,710
Assets reclassified as held for sale 0 0
Disposals (2,389) (3,382)
Capitalized interest 0 0
Ending balance 2,873,626 2,764,413
Cost | Capital works in progress    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 112,543 123,605
Additions/transfers 109,435 158,430
(Write-down) reversal of assets (1,946) 0
Other movements/transfers (100,867) (168,761)
Assets reclassified as held for sale 0 0
Disposals 0 (731)
Capitalized interest 0 0
Ending balance 119,165 112,543
Cost | Mineral properties    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 4,042,553 3,751,842
Additions/transfers 468,395 225,664
(Write-down) reversal of assets (682) (3,183)
Other movements/transfers (2,782) 51,269
Assets reclassified as held for sale 0 0
Disposals (87) (126)
Capitalized interest 33,839 17,087
Ending balance 4,541,236 4,042,553
Cost | Pre-development properties    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 242,825 242,701
Additions/transfers (952) 25
(Write-down) reversal of assets 0 0
Other movements/transfers (12) 0
Assets reclassified as held for sale 1,217 217
Disposals (296) (118)
Capitalized interest 0 0
Ending balance 242,782 242,825
Accumulated depreciation    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance (3,664,255) (3,388,951)
Depreciation for the year (276,856) (274,288)
(Write-down) reversal of assets (654)  
Other movements/transfers 93 (3,196)
Assets reclassified as held for sale (7) (39)
Disposals 1,226 2,219
Ending balance (3,940,453) (3,664,255)
Accumulated depreciation | Land and buildings    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance (111,137) (89,635)
Depreciation for the year (17,968) (21,540)
(Write-down) reversal of assets 0  
Other movements/transfers (35) (106)
Assets reclassified as held for sale 0 0
Disposals 0 144
Ending balance (129,140) (111,137)
Accumulated depreciation | Plant and equipment    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance (1,539,487) (1,396,127)
Depreciation for the year (160,641) (143,008)
(Write-down) reversal of assets (654)  
Other movements/transfers (3,165) (2,387)
Assets reclassified as held for sale 0 0
Disposals 1,145 2,035
Ending balance (1,702,802) (1,539,487)
Accumulated depreciation | Capital works in progress    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 0 0
Depreciation for the year 0 0
(Write-down) reversal of assets 0  
Other movements/transfers 0 0
Assets reclassified as held for sale 0 0
Disposals 0 0
Ending balance 0 0
Accumulated depreciation | Mineral properties    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance (2,009,881) (1,899,466)
Depreciation for the year (98,247) (109,740)
(Write-down) reversal of assets 0  
Other movements/transfers 3,310 (676)
Assets reclassified as held for sale 0 0
Disposals 0 1
Ending balance (2,104,818) (2,009,881)
Accumulated depreciation | Pre-development properties    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance (3,750) (3,723)
Depreciation for the year 0 0
(Write-down) reversal of assets 0  
Other movements/transfers (17) (27)
Assets reclassified as held for sale (7) (39)
Disposals 81 39
Ending balance $ (3,693) $ (3,750)