The U.S. Army Corps of Engineers (USACE) published a Notice of Intent (NOI) to prepare an Environmental Impact Statement (EIS) for the Trilogy Metals’ 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, Trilogy’s 50/50 joint venture with South32 Ltd.
The Corps, 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 Corps 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 (ROD) in September 2028, to be completed concurrently with State of Alaska and Northwest Arctic Borough permitting milestones. The ROD 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.
“Reaching the NOI 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 ROD in September 2028 – materially ahead of the historical norm for comparable federal reviews. With the USA 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,” said Tony Giardini, president and CEO of Trilogy.
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