---
schema_version: "secwatch.filing_event.v1"
accession: "0001104659-22-112172"
form_type: "8-K"
ticker: "PPTA"
cik: "0001526243"
company_name: "PERPETUA RESOURCES CORP."
filed_at: "2022-10-28T23:59:59+00:00"
generated_at: "2026-06-22T22:35:58.662510+00:00"
event_type: "regulatory"
sentiment: "positive"
materiality_score: 0.7
calibrated_materiality_score: 0.7
confidence: "high"
source: SEC EDGAR
---

# USFS selects Perpetua's Stibnite Gold Project as Preferred Alternative in SDEIS

## Summary
- USFS published SDEIS on Oct 28, 2022; 75-day comment period ends Jan 10, 2023.
- Modified Mine Plan reduces footprint by 13%, mined material by 10%, eliminates 168 acres of waste rock storage.
- Project would be only U.S. mined source of antimony; China, Russia, Tajikistan control 90% of global supply.
- SDEIS identifies Perpetua's proposed action as Preferred Alternative, a major NEPA milestone.
- Project aims to restore legacy environmental conditions and produce gold and antimony.

## SEC filing metadata
- accession: 0001104659-22-112172
- form_type: 8-K
- ticker: PPTA
- cik: 0001526243
- company_name: PERPETUA RESOURCES CORP.
- filed_at: 2022-10-28T23:59:59+00:00
- event_type: regulatory
- sentiment: positive
- materiality_score: 0.7
- calibrated_materiality_score: 0.7
- confidence: high
- sec_items: 7.01, 8.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1526243/000110465922112172/0001104659-22-112172-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1526243/000110465922112172/tm2229138d1_8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001104659-22-112172
- JSON: https://secwatch.observer/filing/0001104659-22-112172.json
- Plain text: https://secwatch.observer/filing/0001104659-22-112172.txt

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