

		Plant and		Mining	Right-of-use		Construction-
		Equipment		Interests	assets		in-progress		2025
		$		$			$		$
Cost– Beginning of period		107,818		510,986	6,045		15,525		640,374
Additions		10,548		32,582	3,947		59,707		106,784
Assets classified as held for sale and other disposals		(21,992)		(30,483)	(31)		—		(52,506)
Asset retirement obligations		—		4,545	—		—		4,545
Depreciation capitalized		—		2,834	—		—		2,834
Share-based compensation capitalized		—		134	—		—		134
Impairment		(1,091)		(25,344)	(9)		(2,231)		(28,675)
Borrowing costs		—		10,140	—		—		10,140
Transfers		94		—	—		(94)		—
Currency translation adjustments		452		661	(60)		(105)		948
Cost – End of period		95,829		506,055	9,892		72,802		684,578

Accumulated depreciation – Beginning of period		39,458		4,316	2,807		—		46,581
Depreciation		11,105		1,264	782		—		13,151
Assets classified as held for sale and other disposals		(14,180)		(5,357)	(31)		—		(19,568)
Impairment		(745)		—	(9)		—		(754)
Currency translation adjustments		426		444	(28)		—		842
Accumulated depreciation – End of period		36,064		667	3,521		—		40,252

Cost		95,829		506,055	9,892		72,802		684,578
Accumulated depreciation		(36,064)		(667)	(3,521)		—		(40,252)
Net book value		59,765		505,388	6,371		72,802		644,326

OGR holds a 5% NSR royalty on the Cariboo Gold Project, a 15% gold and silver stream on the San Antonio Gold Project and a 2% to 2.5% stream on all refined metals on the Tintic properties. The Cariboo Gold 5% NSR royalty is perpetual and is secured by a debenture on all of Barkerville movable and immovable assets, including Barkerville’s interest in the property and mineral rights, in an amount not less than $150 million. The security is first-ranking, subject to permitted encumbrances.

In connection with the acquisition of Tintic in May 2022, the Company issued aggregate 2% NSR royalties, with a 50% buyback right in favour of Osisko Development exercisable within five years.

On April 28, 2025, the Company disclosed the results of its optimized feasibility study on the Cariboo Gold Project (“2025 FS”). The 2025 FS considers a single milling facility at the mine site for processing, removing the need to transport flotation concentrate to the QR Mill. This change was considered an indicator of impairment for the QR Mill and, accordingly, management performed an impairment assessment and recorded an impairment charge of $25.3 million on the mining interests related to the QR Mill during the first quarter of 2025. As of December 31, 2025, the net book value related to the QR Mill is entirely written off as it is estimated that the net book value will not be recovered by expected net profits to be generated from future sale of precious metals.