---
schema_version: "secwatch.filing_event.v1"
accession: "0001104659-22-097651"
form_type: "8-K"
ticker: "PPTA"
cik: "0001526243"
company_name: "PERPETUA RESOURCES CORP."
filed_at: "2022-09-06T23:59:59+00:00"
generated_at: "2026-06-23T15:18:13.734737+00:00"
event_type: "other_material"
sentiment: "neutral"
materiality_score: 0.65
calibrated_materiality_score: 0.65
confidence: "high"
source: SEC EDGAR
---

# Perpetua Resources expects USFS to publish Supplemental DEIS for Stibnite Gold Project in Q4 2022

## Summary
- USFS cooperating agency review complete; SDEIS in final reviews in Washington D.C.
- Company believes SDEIS will show improved environmental outcomes and may lead to preferred alternative.
- Project designed to become only domestic mined source of critical mineral antimony.
- Antimony essential for defense supply chains; US currently reliant on China, Russia, Tajikistan.
- Congress authorized 10% production tax credit for antimony in Inflation Reduction Act.

## SEC filing metadata
- accession: 0001104659-22-097651
- form_type: 8-K
- ticker: PPTA
- cik: 0001526243
- company_name: PERPETUA RESOURCES CORP.
- filed_at: 2022-09-06T23:59:59+00:00
- event_type: other_material
- sentiment: neutral
- materiality_score: 0.65
- calibrated_materiality_score: 0.65
- confidence: high
- sec_items: 8.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1526243/000110465922097651/0001104659-22-097651-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1526243/000110465922097651/tm2225160d1_8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001104659-22-097651
- JSON: https://secwatch.observer/filing/0001104659-22-097651.json
- Plain text: https://secwatch.observer/filing/0001104659-22-097651.txt

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