PPTA Perpetua Resources Corp. - 8-K

Item 8.01

Other Events.

On June 1, 2026, Perpetua
Resources Corp. (the “ Company ”) announced that the United States District Court for the District of Idaho (“ U.S.
District Court ”) denied a motion for a preliminary injunction filed by the plaintiffs on May 8, 2026, in the lawsuit they filed
on February 18, 2025 against the United States Forest Service (“ USFS ”), the United States Department of Agriculture
and other federal agencies. The plaintiffs are a number of environmental advocacy groups, including Save the South Fork Salmon, the Idaho
Conservation League and other non-governmental organizations, and their lawsuit alleges violations of the National Environmental Policy
Act and other federal laws in the regulatory process relating to the USFS’s publication of the record of decision and the final
environmental impact statement approving the modified mine plan for the Company’s Stibnite Gold Project (the “ Project ”).
In a memorandum decision issued on May 29, 2026, the U.S. District Court denied the plaintiffs’ motion for a preliminary injunction
seeking to delay certain planned construction activities for the Project, and also granted in part the Company’s motion to strike
certain materials submitted by the plaintiffs in connection with their motion.

Following the Court’s
decision, on May 30, 2026, the Company commenced additional critical path construction activities for the 2026 field season, including
initial work associated with the Burntlog Route. These road upgrades will continue in parallel with additional planned construction of
on-site worker housing facilities, selected powerline upgrades, and approved exploration and geotechnical drilling. This new activity
builds upon the early works construction Perpetua began in October 2025.

Cautionary Statement

Statements contained in
this Current Report on Form 8-K (“ Current Repor t”) that are not historical facts are “forward-looking information”
or “forward-looking statements” (collectively, “ Forward-Looking Information ”) within the meaning of applicable
Canadian securities legislation and the United States Private Securities Litigation Reform Act of 1995. Forward-Looking Information includes,
but is not limited to, disclosure regarding the Company’s planned construction activities. Investors should be aware that the U.S.
District Court’s decision denying the motion for a preliminary injunction is not a final decision on the ongoing lawsuit filed by
the plaintiffs in this case and could be appealed.