---
schema_version: "secwatch.filing_event.v1"
accession: "0001104659-22-117496"
form_type: "8-K"
ticker: "PPTA"
cik: "0001526243"
company_name: "PERPETUA RESOURCES CORP."
filed_at: "2022-11-14T23:59:59+00:00"
generated_at: "2026-06-21T20:02:39.971650+00:00"
event_type: "other_material"
sentiment: "positive"
materiality_score: 0.65
calibrated_materiality_score: 0.65
confidence: "high"
source: SEC EDGAR
---

# Perpetua Resources receives USFS Preferred Alternative for Stibnite Gold Project; DoD funds antimony study

## Summary
- USFS identified Perpetua's Modified Mine Plan as Preferred Alternative on Oct 28, 2022, a major NEPA milestone.
- Awarded Department of Defense funding to study production of military-grade antimony trisulfide from Stibnite.
- Clean Water Act stay with Nez Perce Tribe extended through Jan 31, 2023; productive mediation ongoing.
- Completed summer field program including stream diversion and removal of legacy waste rock dump.

## SEC filing metadata
- accession: 0001104659-22-117496
- form_type: 8-K
- ticker: PPTA
- cik: 0001526243
- company_name: PERPETUA RESOURCES CORP.
- filed_at: 2022-11-14T23:59:59+00:00
- event_type: other_material
- 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/1526243/000110465922117496/0001104659-22-117496-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1526243/000110465922117496/tm2230391d1_8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001104659-22-117496
- JSON: https://secwatch.observer/filing/0001104659-22-117496.json
- Plain text: https://secwatch.observer/filing/0001104659-22-117496.txt

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