Trilogy Metals Arctic copper project enters NEPA review

The U.S. Army Corps of Engineers has begun the NEPA review for Trilogy Metals’ Arctic Project, marking the first major federal permitting milestone on its FAST-41 schedule.

Rhea-AI Filing Summary

Trilogy Metals Inc. (TMQ) reported that the U.S. Army Corps of Engineers has published a Notice of Intent to prepare an Environmental Impact Statement for the company’s flagship Arctic copper-zinc-lead-gold-silver project in Alaska’s Ambler Mining District. This formally starts the project’s environmental review under the National Environmental Policy Act (NEPA) and launches the public scoping phase, during which agencies, Tribes, local communities, and other stakeholders can comment on issues and alternatives to be analyzed.

The Arctic Project is being advanced by Ambler Metals LLC, a 50/50 joint venture between Trilogy Metals and South32 Limited. The project is on a coordinated FAST-41 federal and state permitting schedule, with the current timetable targeting a draft Environmental Impact Statement in October 2027, a federal Record of Decision in September 2028, and overall environmental review and permitting completion around November 2028. Company executives emphasize that this milestone was reached on the published schedule and highlight their focus on high environmental standards, community cooperation, and supporting traditional and subsistence lifestyles in Northwest Alaska.

Filing Explained

The Arctic Project has entered federal environmental review, but a Record of Decision and additional authorizations remain before permitting is complete.

This Form 8-K reports that the U.S. Army Corps of Engineers published a Notice of Intent for the Arctic Project, formally starting the federal NEPA environmental review and public scoping; permitting has advanced into review but is not complete.

The filing identifies the Army Corps as lead federal agency and says it received Ambler Metals’ Clean Water Act Section 404 permit application on April 20, 2026. Public scoping will gather comments from residents, Tribes, communities, and other stakeholders on issues and alternatives for the Environmental Impact Statement.

The agencies’ estimated 29-month integrated review timetable still requires a Record of Decision and additional federal and state authorizations before the targeted overall completion in November 2028.

8-K Event Classification

2 items: 7.01, 9.01

2 items

Item 7.01 Regulation FD Disclosure Disclosure

Material non-public information disclosed under Regulation Fair Disclosure, often investor presentations or guidance.

Item 9.01 Financial Statements and Exhibits Exhibits

Financial statements, pro forma financial information, or exhibit attachments filed with this report.

Key Figures

Joint venture interest: 50% Ambler Metals interest in UKMP: 100% Land package size: 190,929 hectares +5 more

8 metrics

Joint venture interest 50% Trilogy Metals’ ownership interest in Ambler Metals LLC

Ambler Metals interest in UKMP 100% Interest in the Upper Kobuk Mineral Projects in Alaska

Land package size 190,929 hectares Area covering the Upper Kobuk Mineral Projects including Arctic and Bornite deposits

Integrated review timetable 29 months Estimated duration of the integrated federal and state permitting review

Draft EIS target date October 2027 Target date for publication of the draft Environmental Impact Statement

Record of Decision target date September 2028 Target date for the federal Record of Decision on the Arctic Project

Overall permitting completion target November 2028 Targeted completion of environmental review and remaining authorizations

Section 404 application date April 20, 2026 Date Ambler Metals filed its Clean Water Act Section 404 permit application

Key Terms

Environmental Impact Statement, National Environmental Policy Act, FAST-41, Record of Decision, +2 more

6 terms

Environmental Impact Statement regulatory

"Notice of Intent ("NOI") to prepare an Environmental Impact Statement ("EIS")"

An environmental impact statement is a formal report that evaluates the likely effects a proposed project or plan will have on air, water, land, wildlife and local communities; it lays out potential harms, proposed mitigation measures, and alternatives. Think of it as a project’s environmental report card and repair plan: regulators use it to decide permits, and investors use it to assess delays, extra costs, legal risks and reputation exposure tied to environmentally sensitive issues.

National Environmental Policy Act regulatory

"formally initiates the environmental review of the project under the National Environmental Policy Act"

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.

FAST-41 regulatory

"a major milestone on the coordinated and transparent FAST-41 permitting schedule"

A FAST-41 designation comes from a U.S. law that sets up a coordinated, time-lined review process for large federal infrastructure projects, aiming to reduce delays by having agencies work together and meet clear deadlines. For investors, it matters because projects with FAST-41 oversight are likelier to reach permits and construction on schedule, reducing the risk of costly hold-ups much like a traffic controller clearing lanes so a convoy can move without unexpected stops.

Record of Decision regulatory

"target a Draft Environmental Impact Statement in October 2027 and a Record of Decision in September 2028"

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.

volcanogenic massive sulfide technical

"hosts polymetallic volcanogenic massive sulfide ("VMS") deposits that contain copper, zinc, lead, gold and silver"

A volcanogenic massive sulfide (VMS) deposit is a concentrated underground or seabed accumulation of metal-bearing minerals formed by ancient volcanic activity. Think of it like a naturally occurring treasure chest where copper, zinc, lead and often gold or silver are packed closely together, which can make extraction more efficient and valuable. Investors care because VMS deposits can underpin mining projects with high metal content and predictable geology, affecting a company’s potential revenue, capital needs and exploration appeal.

Clean Water Act Section 404 regulatory

"USACE, which received Ambler Metals' Clean Water Act Section 404 permit application"

Clean Water Act Section 404 is the federal rule that requires a permit before moving or placing soil, rock, or other material into U.S. waters and wetlands, administered by the Army Corps of Engineers with oversight from the Environmental Protection Agency. For investors, it matters because permit approvals or denials can delay or stop land- and water-related projects, add mitigation or cleanup costs, and create legal and reputational risks—like needing a special building permit that can change a project's timeline and budget.

FAQ

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

What did Trilogy Metals (TMQ) announce regarding the Arctic Project?

Trilogy Metals announced that the U.S. Army Corps of Engineers has published a Notice of Intent to prepare an Environmental Impact Statement for the Arctic Project, formally initiating the NEPA environmental review and launching the public scoping phase.

How is the Arctic Project structured for Trilogy Metals (TMQ)?

The Arctic Project is being advanced by Ambler Metals LLC, a 50/50 joint venture between Trilogy Metals Inc. and South32 Limited, with Ambler Metals holding a 100% interest in the Upper Kobuk Mineral Projects.

What is the permitting timeline for Trilogy Metals’ (TMQ) Arctic Project?

The integrated federal and state timetable targets a draft Environmental Impact Statement in October 2027, a federal Record of Decision in September 2028, and overall environmental review and permitting completion around November 2028 under the FAST-41 program.

What role does FAST-41 play in Trilogy Metals’ (TMQ) Arctic Project?

FAST-41 provides a coordinated and transparent permitting framework. The Arctic Project follows a 29‑month integrated review schedule published on the Permitting Dashboard, and the company notes that this is materially ahead of the historical baseline for comparable federal reviews.

Where is Trilogy Metals’ (TMQ) Arctic Project located and what does it produce?

The Arctic Project is in northwestern Alaska’s Ambler Mining District, within the Upper Kobuk Mineral Projects. It is described as a high-grade copper-zinc-lead-gold-silver volcanogenic massive sulfide deposit within a land package of about 190,929 hectares.

What agreement does Trilogy Metals (TMQ) have with local Alaska stakeholders?

Ambler Metals has an agreement with NANA Regional Corporation, Inc., an Alaska Native Corporation, providing a framework for exploration and potential development of the Ambler Mining District in cooperation with local communities and with attention to subsistence lifestyles.

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

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Available on EDGAR 09/21/2026 - 08:32 AM Accepted by SEC EDGAR 09/21/2026 - 08:32 AM Learn about SEC filing dates

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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): September 21, 2026

_______________________

Trilogy Metals Inc.

(Exact name of registrant as specified in its charter)

_______________________

British Columbia	001-35447	98-1006991
(State or other jurisdiction of incorporation)	(Commission File Number)	(I.R.S. Employer Identification Number)

Suite 901, 510 Burrard Street
Vancouver, British Columbia
Canada, V6C 3A8

(Address of principal executive offices, including zip code)

(604) 638-8088

(Registrant’s telephone number, including area code)

N/A

(Former name or former address, if changed since last report)

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 (see General Instruction A.2 below):

☐ 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 240.24d-2(b))

☐ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.23e-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	TMQ	NYSE American Toronto Stock Exchange

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

Emerging growth company ☐

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 7.01 Regulation FD Disclosure

On September 21, 2026, Trilogy Metals Inc. (or the “Company”) issued a press release announcing that the U.S. Army Corps of Engineers has published a Notice of Intent to prepare an Environmental Impact Statement for the Company’s flagship Arctic Project in northwestern Alaska’s Ambler Mining District. The press release is attached hereto as Exhibit 99.1.

The information contained in the press release attached hereto is being furnished and shall not be deemed filed for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liability of that section, and shall not be incorporated by reference into any registration statement or other document filed under the Securities Act of 1933, as amended, or the Exchange Act, except as shall be expressly set forth by specific reference in such filing.

Item 9.01 Financial Statements and Exhibits

(d) Exhibits

Exhibit Number	Description
99.1	Press release, dated September 21, 2026
104	Cover Page Interactive Data File, formatted in Inline Extensible Business Reporting Language (iXBRL)

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.

	TRILOGY METALS INC.
Dated: September 21, 2026	By:	/s/ Elaine Sanders
		Elaine Sanders, Chief Financial Officer

Exhibit 99.1

 

Trilogy Metals Announces Publication of Notice of Intent by U.S. Army Corps of Engineers for Alaska's High-Grade Arctic Copper-Zinc-Lead-Gold-Silver Project

VANCOUVER, BC, Sept. 21, 2026 /CNW/ -- Trilogy Metals Inc. (NYSE American: TMQ) (TSX: TMQ) ("Trilogy Metals", "Trilogy" or the "Company") announced today that the U.S. Army Corps of Engineers ("USACE") has published a Notice of Intent ("NOI") to prepare an Environmental Impact Statement ("EIS") for the Company's flagship Arctic Project in northwestern Alaska's Ambler Mining District. Publication of the NOI formally initiates the environmental review of the project under the National Environmental Policy Act ("NEPA") and launches the public scoping phase. The high-grade Arctic Copper-Zinc-Lead-Gold-Silver Project is being advanced by Ambler Metals LLC ("Ambler Metals"), Trilogy's 50/50 joint venture with South32 Limited (ASX, LSE, JSE: S32; ADR: SOUHY).

 Highlights

• U.S. Army Corps of Engineers Publishes Notice of Intent to Prepare an Environmental Impact Statement, Formally Commencing the NEPA Review for the Arctic Project
• Publication of the NOI Launches the Public Scoping Phase and Marks a Major Milestone on the Coordinated and Transparent FAST-41 Permitting Schedule
• Milestone Achieved on Schedule, Consistent with the Integrated Federal and State Timetable Published on the Permitting Dashboard in July 2026
• Schedule Continues to Target a Draft Environmental Impact Statement in October 2027 and a Record of Decision in September 2028

The NOI is the first key federal milestone on the coordinated federal and state permitting schedule published on the Federal Permitting Improvement Steering Council's (the "Permitting Council") Permitting Dashboard at permits.performance.gov in July 2026. With the NOI published, the USACE has commenced the public scoping process, during which the agency invites comments from the public, local residents, regional organizations, Tribes, and other stakeholders to help identify the significant issues and reasonable alternatives to be analyzed in the EIS. 

The USACE, which received Ambler Metals' Clean Water Act Section 404 permit application filed on April 20, 2026, is the project's lead federal agency. Under the published schedule, the USACE and cooperating agencies have committed to an estimated 29-month integrated federal and state review timetable, materially ahead of the historical baseline for comparable federal reviews. With the NOI now published, the schedule continues to target publication of a draft EIS in October 2027 and a Record of Decision in September 2028, to be completed concurrently with State of Alaska and Northwest Arctic Borough permitting milestones. The Record of Decision represents the culmination of the federal environmental review under NEPA, and the remaining federal and state authorizations that follow drive the schedule's targeted overall completion in November 2028. 

Tony Giardini, President and CEO of Trilogy, commented: "Reaching the Notice of Intent on schedule underscores the discipline and coordination that FAST-41 brings to the Arctic Project. This milestone launches the NEPA review and public scoping phase and keeps us on a timeline to a Record of Decision in September 2028 – materially ahead of the historical norm for comparable federal reviews. With the U.S. reliant on foreign nations for much of its copper, the structured, transparent advancement of a nationally important critical minerals asset like Arctic has never been more strategically important."

Ron Rimelman, President of Ambler Metals, added: "This Notice of Intent opens an exciting new chapter for the Arctic Project. We welcome this thorough public process as an opportunity to continue to demonstrate our commitment to meeting the highest environmental standards and ensuring Alaskans benefit from this development. Earning and maintaining our social license to operate is essential, and we remain dedicated to ensuring this project supports traditional and subsistence lifestyles while serving as a powerful engine for long-term economic self-determination for Northwest Alaska communities."

For more information about the FAST-41 permitting program, see Trilogy's news releases dated May 15, 2026 and July 16, 2026.

About Trilogy Metals

Trilogy Metals Inc. is a metal exploration and development company holding a 50 percent interest in Ambler Metals LLC, which has a 100 percent interest in the Upper Kobuk Mineral Projects ("UKMP") in northwestern Alaska. On December 19, 2019, South32 Limited, a globally diversified mining and metals company, exercised its option to form a 50/50 joint venture with Trilogy Metals. The UKMP is located within the Ambler Mining District which is one of the richest and most prospective known copper-dominant districts in the world. It hosts polymetallic volcanogenic massive sulfide ("VMS") deposits that contain copper, zinc, lead, gold and silver, and carbonate replacement deposits which have been found to host high-grade copper and cobalt mineralization. Exploration efforts have been focused on two deposits in the Ambler Mining District – the Arctic VMS deposit and the Bornite carbonate replacement deposit. Both deposits are located within a land package that spans approximately 190,929 hectares. Ambler Metals has an agreement with NANA Regional Corporation, Inc., an Alaska Native Corporation, that provides a framework for the exploration and potential development of the Ambler Mining District in cooperation with local communities. Trilogy Metals' vision is to develop the Ambler Mining District into a premier North American copper producer while protecting and respecting subsistence livelihoods.

Cautionary Note Regarding Forward-Looking Statements

This news release includes certain "forward-looking information" and "forward-looking statements" (collectively "forward-looking statements") within the meaning of applicable Canadian and United States securities legislation, including the United States Private Securities Litigation Reform Act of 1995. All statements, other than statements of historical fact, included herein, including, without limitation, statements regarding the anticipated timing and outcomes of the permitting schedule and federal environmental review process; the scope, conduct and outcome of the NEPA review and public scoping process; the anticipated completion date of environmental review and permitting; timing of a draft EIS and Record of Decision; expectations regarding a construction decision on the Arctic Project; expectations regarding interagency coordination and cooperation; and the anticipated benefits of FAST-41 status to the Arctic Project are forward-looking statements. Forward-looking statements are frequently, but not always, identified by words such as "expects", "anticipates", "believes", "intends", "estimates", "potential", "possible", and similar expressions, or statements that events, conditions, or results "will", "may", "could", or "should" occur or be achieved. Forward-looking statements involve various risks and uncertainties. There can be no assurance that such statements will prove to be accurate, and actual results and future events could differ materially from those anticipated in such statements. Important factors that could cause actual results to differ materially from the Company's expectations include the uncertainties involving the outcome of pending litigation, success of exploration activities, permitting timelines, requirements for additional capital, government regulation of mining operations, environmental risks, prices for energy inputs, labour, materials, supplies and services, uncertainties involved in the interpretation of drilling results and geological tests, unexpected cost increases and other risks and uncertainties disclosed in the Company's Annual Report on Form 10-K for the year ended November 30, 2025 filed with Canadian securities regulatory authorities and with the United States Securities and Exchange Commission and in other Company reports and documents filed with applicable securities regulatory authorities from time to time. The Company's forward-looking statements reflect the beliefs, opinions, and projections on the date the statements are made. The Company assumes no obligation to update the forward-looking statements or beliefs, opinions, projections, or other factors, should they change, except as required by law.

View original content to download multimedia:https://www.prnewswire.com/news-releases/trilogy-metals-announces-publication-of-notice-of-intent-by-us-army-corps-of-engineers-for-alaskas-high-grade-arctic-copper-zinc-lead-gold-silver-project-302883732.html

SOURCE Trilogy Metals Inc.

View original content to download multimedia: http://www.newswire.ca/en/releases/archive/September2026/21/c8696.html

%CIK: 0001427328

For further information: Company Contact: Matthew Keevil, Vice President, Investor Relations and Business Development, ir@trilogymetals.com, Phone: +1 604 638 8088

CO: Trilogy Metals Inc.

CNW 06:30e 21-SEP-26

Filing Exhibits & Attachments

5 documents

Press Releases

• EX-991 NEWS RELEASE DATED SEPTEMBER 21, 2026 12.1 KB
• EX-991 PRINTER FRIENDLY VERSION 132.0 KB

Other Documents

• EX-101 XBRL TAXONOMY EXTENSION SCHEMA 3.0 KB
• EX-101 XBRL TAXONOMY EXTENSION LABEL LINKBASE 33.4 KB
• EX-101 XBRL TAXONOMY EXTENSION PRESENTATION LINKBASE 21.8 KB