Court denies bid to halt Perpetua Stibnite work

Perpetua Resources Corp. reported that the U.S. District Court for the District of Idaho denied a motion for a preliminary injunction filed by environmental groups seeking to delay certain planned construction activities at its Stibnite Gold Project.

Rhea-AI Filing Summary

Perpetua Resources Corp. reported that the U.S. District Court for the District of Idaho denied a motion for a preliminary injunction filed by environmental groups seeking to delay certain planned construction activities at its Stibnite Gold Project. The lawsuit alleges violations of the National Environmental Policy Act and other federal laws related to the U.S. Forest Service’s record of decision and final environmental impact statement approving the modified mine plan. After the court’s May 29, 2026 memorandum decision, the company began additional critical path construction on May 30, 2026 for the 2026 field season, including work on the Burntlog Route, worker housing, powerline upgrades, and approved drilling. The company notes this ruling is not a final decision on the lawsuit and could be appealed.

Insights

Mining project and litigation risk analyst

Court denial of an injunction lets Perpetua continue key Stibnite construction, but core litigation remains unresolved.

The U.S. District Court’s refusal to grant a preliminary injunction allows Perpetua Resources to proceed with critical path work at the Stibnite Gold Project. This includes upgrades to the Burntlog Route access road, on-site worker housing, selected powerline improvements, and exploration and geotechnical drilling.

The underlying lawsuit, brought by environmental groups under the National Environmental Policy Act and other federal laws, still challenges the U.S. Forest Service’s record of decision and final environmental impact statement approving the modified mine plan. The court also granted in part the company’s motion to strike certain plaintiff materials, which shapes what the court will consider.

The company explicitly notes that the decision on the injunction is not a final ruling on the case and could be appealed. Future court decisions in this litigation will determine whether current construction momentum at Stibnite can be maintained over time.

8-K Event Classification

Item 8.01 — Other Events

1 item

Item 8.01 Other Events Other

Voluntary disclosure of events the company deems important to shareholders but not covered by other items.

Key Figures

Lawsuit filing date: February 18, 2025 Injunction motion date: May 8, 2026 Court decision on injunction: May 29, 2026 +2 more

5 metrics

Lawsuit filing date February 18, 2025 Date environmental groups filed lawsuit against federal agencies

Injunction motion date May 8, 2026 Date plaintiffs filed motion for preliminary injunction

Court decision on injunction May 29, 2026 Date U.S. District Court denied preliminary injunction

Start of additional construction May 30, 2026 Date Perpetua commenced additional critical path work for 2026 field season

Early works start October 2025 Month Perpetua began early works construction at Stibnite

Key Terms

preliminary injunction, National Environmental Policy Act, record of decision, final environmental impact statement, +1 more

5 terms

preliminary injunction regulatory

"the U.S. District Court denied a motion for a preliminary injunction filed by the plaintiffs"

A preliminary injunction is a court order that temporarily stops a party from taking certain actions while a legal case is ongoing. It’s like a warning sign that prevents someone from moving forward with plans that could cause harm or unfair advantage until the court makes a final decision. For investors, it signals that there may be unresolved legal issues affecting the parties involved, which can impact a company's operations or value.

National Environmental Policy Act regulatory

"their lawsuit alleges violations of the National Environmental Policy Act and other federal laws"

A U.S. law that requires federal agencies to evaluate and disclose the likely environmental effects of major projects and decisions before they proceed. For investors, that review can delay approvals, add compliance costs, or change project plans—like a required safety inspection that can uncover problems or require fixes before construction continues—so NEPA processes are a key source of timing, cost and legal risk for projects involving federal permits or funding.

record of decision regulatory

"in the regulatory process relating to the USFS’s publication of the record of decision"

A record of decision is an official written statement from a government regulator that explains and finalizes its approval or denial of a proposed project after reviewing environmental and legal factors. For investors, it matters because it removes a major regulatory uncertainty — like a referee’s final whistle — allowing a project to move forward, be funded, or be halted, which can change timelines, costs, and potential liabilities.

final environmental impact statement regulatory

"and the final environmental impact statement approving the modified mine plan"

A final environmental impact statement is the official, comprehensive report that assesses the likely environmental effects of a proposed project, describes alternatives, lists steps to reduce harm, and includes responses to public and agency comments. For investors it is like a project’s environmental report card: it signals whether regulators are likely to approve permits, how much delay or added cost to expect, and the legal or reputational risks that could affect a project's timeline or value.

critical path construction activities technical

"the Company commenced additional critical path construction activities for the 2026 field season"

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What legal development did Perpetua Resources (PPTA) report regarding the Stibnite Gold Project?

Perpetua Resources reported that the U.S. District Court for the District of Idaho denied a motion for a preliminary injunction. Environmental groups had sought to delay certain planned construction activities at the Stibnite Gold Project while challenging federal approvals.

Who filed the lawsuit mentioned in Perpetua Resources’ (PPTA) Form 8-K?

The lawsuit was filed by environmental advocacy groups, including Save the South Fork Salmon, the Idaho Conservation League, and other non-governmental organizations. They allege violations of the National Environmental Policy Act and other federal laws in the federal review of the Stibnite mine plan.

What project work is Perpetua Resources (PPTA) proceeding with after the court decision?

Following the court’s memorandum decision, Perpetua began additional critical path construction for the 2026 field season. Work includes Burntlog Route road upgrades, on-site worker housing facilities, selected powerline upgrades, and approved exploration and geotechnical drilling at the Stibnite Gold Project.

Does the court’s denial of an injunction end the lawsuit against Perpetua Resources (PPTA)?

No, the court’s denial of the preliminary injunction is not a final decision on the lawsuit. Perpetua states that the ongoing case challenging federal approvals for Stibnite continues and that this injunction decision could be appealed by the plaintiffs.

What federal approvals are being challenged in the Perpetua Resources (PPTA) lawsuit?

Plaintiffs are challenging the U.S. Forest Service’s publication of the record of decision and the final environmental impact statement. These documents approved the modified mine plan for Perpetua’s Stibnite Gold Project under the National Environmental Policy Act and related federal laws.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

FORM 8-K

CURRENT REPORT
Pursuant to Section 13 or 15(d)
of the Securities Exchange Act of 1934

Date of report (date of earliest event reported): June 1, 2026

Perpetua Resources Corp.

(Exact name of registrant as specified in its charter)

British Columbia	001-39918	98-1040943
(State or other jurisdiction of incorporation)	(Commission File Number)	(I.R.S. Employer Identification No.)

405 S. 8th Street, Ste. 201 Boise, Idaho		83702
(Address of principal executive offices)		(Zip Code)

Registrant’s telephone number, including area code: (208) 901-3060  

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

¨ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

¨ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

¨ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

¨ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of each class	Trading Symbol(s)	Name of each exchange on which registered
Common Shares, without par value	PPTA	Nasdaq Capital Market

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (17 CFR §230.405) or Rule 12b-2 of the Securities Exchange Act of 1934 (17 CFR §240.12b-2).

Emerging growth company x

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ¨

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 Report”) 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.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

	PERPETUA RESOURCES CORP.
Dated: June 1, 2026	By:	/s/ Mark Murchison
		Mark Murchison
		Chief Financial Officer

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