---
schema_version: "secwatch.filing_event.v1"
accession: "0001279569-26-000898"
form_type: "8-K"
ticker: "TMQ"
cik: "0001543418"
company_name: "Trilogy Metals Inc."
filed_at: "2026-09-21T12:32:05+00:00"
generated_at: "2026-09-21T12:35:12.601060+00:00"
event_type: "regulatory"
sentiment: "positive"
materiality_score: 0.65
calibrated_materiality_score: 0.65
confidence: "high"
source: SEC EDGAR
---

# USACE publishes Notice of Intent to prepare EIS for Trilogy's Arctic Project

## Summary
- US Army Corps of Engineers published NOI on Sept 21, 2026, formally commencing NEPA review and public scoping.
- Arctic Project is high-grade copper-zinc-lead-gold-silver deposit in Alaska's Ambler Mining District, advanced by Ambler Metals LLC.
- Ambler Metals is Trilogy Metals' 50/50 JV with South32 (ASX/LSE/JSE: S32; ADR: SOUHY).
- Targets draft EIS in October 2027 and Record of Decision in September 2028, completing overall permitting by November 2028.
- USACE received Clean Water Act Section 404 permit application on April 20, 2026; FAST-41 schedule aims to speed review.

## SEC filing metadata
- accession: 0001279569-26-000898
- form_type: 8-K
- ticker: TMQ
- cik: 0001543418
- company_name: Trilogy Metals Inc.
- filed_at: 2026-09-21T12:32:05+00:00
- event_type: regulatory
- sentiment: positive
- materiality_score: 0.65
- calibrated_materiality_score: 0.65
- confidence: high
- sec_items: 7.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1543418/000127956926000898/0001279569-26-000898-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1543418/000127956926000898/form8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001279569-26-000898
- JSON: https://secwatch.observer/filing/0001279569-26-000898.json
- Plain text: https://secwatch.observer/filing/0001279569-26-000898.txt

This AI-assisted summary is a reading aid. Review the linked SEC EDGAR filing before relying on any specific claim.