Perpetua Resources expands Hatch EPCM contract; $204.3M control budget for Stibnite Gold Project

PERPETUA RESOURCES CORP.

Amendment adds pressure-oxidation/oxygen system (POX/O2) to Hatch's scope, with $42M of the $204.3M control budget allocated to it.
Control budget total $204.3M for engineering, procurement, construction management services for Stibnite Gold Project.
Process guarantee includes performance parameters with liquidated damages or bonuses, not material to contract price.
Intellectual property provisions updated; POX/O2 improvements remain Hatch property, owner gets license for Project.
Amendment effective Feb 28, 2026; follows preliminary design work under prior limited notices to proceed.

item 1.01 item 9.01

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