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MINERAL PROPERTIES, PLANT AND EQUIPMENT (Tables)
 12 Months Ended
Dec. 31, 2025
Property, plant and equipment [abstract]  
Schedule of Information About Property Plant and Equipment
Note
Mineral properties
(note 10(a))
Plant and
equipment
Construction-
in-progress
(note 10(b))
Exploration and evaluation assetsTotal
Cost
Balance – December 31, 2023
$2,217,943 $971,885 $746,138 $51,003 $3,986,969 
Remeasurement to fair value on Greenstone Acquisition5(c)684,254 (15,227)— — 669,027 
Acquired in Greenstone Acquisition(1)
5(c)890,390 76,013 479,937 5,762 1,452,102 
Additions(2)
135,442 102,829 285,419 — 523,690 
Transfers436,969 818,419 (1,255,388)— — 
Disposals— (52,820)— — (52,820)
Change in reclamation and closure cost asset16,161 — — — 16,161 
Foreign currency translation(50,456)(14,716)(43,846)406 (108,612)
Balance – December 31, 2024
4,330,703 1,886,383 212,260 57,171 6,486,517 
Acquired in Calibre Acquisition5(a)2,020,450 274,972 630,410 — 2,925,832 
Additions(2)
257,661 293,901 202,359 — 753,921 
Transfers272,823 729,148 (1,001,971)— — 
Disposals(3)
(55,920)(75,947)— — (131,867)
Change in reclamation and closure cost asset70,838 — — — 70,838 
Reclassified to assets held for sale9(765,258)(572,430)(3,493)(13,750)(1,354,931)
Balance – December 31, 2025
$6,131,297 $2,536,027 $39,565 $43,421 $8,750,310 
Accumulated depreciation and depletion
Balance – December 31, 2023
$457,780 $303,976 $— $— $761,756 
Remeasurement to fair value on Greenstone Acquisition5(c)— (14,699)— — (14,699)
Depreciation and depletion97,570 118,884 — — 216,454 
Disposals— (40,895)— — (40,895)
Foreign currency translation— (812)— — (812)
Balance – December 31, 2024
555,350 366,454 — — 921,804 
Depreciation and depletion360,944 238,861 — — 599,805 
Disposals(3)
(3,624)(48,179)— — (51,803)
Reclassified to assets held for sale9(334,087)(295,738)— — (629,825)
Balance – December 31, 2025
$578,583 $261,398 $— $— $839,981 
Net book value
At December 31, 2024
$3,775,353 $1,519,929 $212,260 $57,171 $5,564,713 
At December 31, 2025
$5,552,714 $2,274,629 $39,565 $43,421 $7,910,329 
(1)Acquired in Greenstone Acquisition amounts represent the fair values of 40% of Greenstone’s mineral properties, plant and equipment that the Company did not previously own prior to the Greenstone Acquisition.
(2)Additions for the year ended December 31, 2025 include the following non-cash additions: $48.4 million (2024 – $52.7 million) in additions to right-of-use assets included in plant and equipment; and $22.7 million and $7.0 million (2024 – $5.8 million and $1.8 million) of depreciation and depletion capitalized to mineral properties and construction-in-progress, respectively. In addition, $19.1 million (2024 – $84.1 million) of borrowing costs incurred were capitalized to construction-in-progress.
(3)Disposals during the year ended December 31, 2025 mainly relate to the Nevada Assets Sale (note 5(b)).
Schedule of Information About Significant Royalty Arrangements
Mineral propertyRoyalty arrangements
Greenstone
3% NSR
Valentine
2% NSR; 3% NSR
Mesquite
Weighted average LOM NSR of 2%
Nicaragua
2% NSR at La Libertad; 3% NSR at El Limon
Castle Mountain
2.65% NSR; 5% of gross revenue for the South Domes area
Los Filos
3% NSR for the Xochipala concession; 0.5% of gross revenue