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Property, plant and equipment (Tables)
 12 Months Ended
Dec. 31, 2025
Disclosure of detailed information about property, plant and equipment [abstract]  
Schedule of Property, Plant and Equipment
Land and buildingsPlant and equipmentCapital works in progressMineral propertiesPre-development propertiesTotal
Cost
Balance at January 1, 2024$257,480 $2,764,413 $112,543 $4,042,553 $242,825 $7,419,814 
Additions/transfers4,903 40,339 109,435 468,395 (952)622,120 
(Write-down) reversal of assets (1,403)523 (1,946)(682)— (3,508)
Other movements/transfers21,446 70,740 (100,867)(2,782)(12)(11,475)
Assets reclassified as held for sale
— — — — 1,217 1,217 
Disposals— (2,389)— (87)(296)(2,772)
Capitalized interest— — — 33,839 — 33,839 
Balance at December 31, 2024$282,426 $2,873,626 $119,165 $4,541,236 $242,782 $8,059,235 
Balance at January 1, 2025$282,426 $2,873,626 $119,165 $4,541,236 $242,782 $8,059,235 
Additions/transfers10,070 84,744 188,039 701,553 4,684 989,090 
Write-down of assets — — — (247)— (247)
Other movements/transfers6,647 153,809 (163,559)(439)79 (3,463)
Disposals(66)(10,173)— (464)(2,832)(13,535)
Capitalized interest— — — 50,596 — 50,596 
Balance at December 31, 2025$299,077 $3,102,006 $143,645 $5,292,235 $244,713 $9,081,676 
Accumulated depreciation
Balance at January 1, 2024$(111,137)$(1,539,487)$— $(2,009,881)$(3,750)$(3,664,255)
Depreciation for the year(17,968)(160,641)— (98,247)— (276,856)
Write-down of assets— (654)— — — (654)
Other movements(35)(3,165)— 3,310 (17)93 
Assets reclassified as held for sale— — — — (7)(7)
Disposals— 1,145 — — 81 1,226 
Balance at December 31, 2024$(129,140)$(1,702,802)$— $(2,104,818)$(3,693)$(3,940,453)
Balance at January 1, 2025$(129,140)$(1,702,802)$— $(2,104,818)$(3,693)$(3,940,453)
Depreciation for the year(15,724)(138,014)— (110,972)— (264,710)
Other movements/transfers— 2 — — (129)(127)
Disposals66 9,029 — — 83 9,178 
Balance at December 31, 2025$(144,798)$(1,831,785)$— $(2,215,790)$(3,739)$(4,196,112)
Carrying amounts
At January 1, 2024$146,343 $1,224,926 $112,543 $2,032,672 $239,075 $3,755,559 
At December 31, 2024$153,286 $1,170,824 $119,165 $2,436,418 $239,089 $4,118,782 
Balance at December 31, 2025$154,279 $1,270,221 $143,645 $3,076,445 $240,974 $4,885,564 
Schedule of Key Assumptions Used for Assessing Recoverable Amount of Company's CGUs Versus Carrying Values The significant assumptions used for determining the recoverable amount of the Olympias CGU at December 31, 2025 are reflected in the table below.
20252024
Gold price ($/oz)
$4,000 - $3,000
$2,600 - $2,100
Real discount rate
7.25% - 8.25%
6.75% - 7.75%
VBPP value/oz
$37 - $54/oz
$40 - $60/oz