---
schema_version: "secwatch.filing_event.v1"
accession: "0001104659-25-101285"
form_type: "8-K"
ticker: "PPTA"
cik: "0001526243"
company_name: "PERPETUA RESOURCES CORP."
filed_at: "2025-10-21T23:59:59+00:00"
generated_at: "2026-05-17T03:01:09.846043+00:00"
event_type: "other_material"
sentiment: "positive"
materiality_score: 0.85
confidence: "high"
source: SEC EDGAR
---

# Perpetua Resources starts construction on Stibnite Gold Project after posting $139M surety bond

## Summary
- Posted $139M surety bond with Endurance Assurance for construction-phase reclamation; annual premium 1.5% of penal sum.
- Obtained $35M standby letter of credit from Bank of Nova Scotia, secured by $40.5M cash deposit, under a $39.5M credit facility.
- Also posted $4.2M letter of credit with USACE for Clean Water Act Section 404 off-site mitigation.
- Received USFS and IDL notices to proceed; early works construction began October 21, 2025.
- Indemnity agreement requires minimum $200M in collateral/cash/marketable securities; contingent liability up to $139M plus costs.

## SEC filing metadata
- accession: 0001104659-25-101285
- form_type: 8-K
- ticker: PPTA
- cik: 0001526243
- company_name: PERPETUA RESOURCES CORP.
- filed_at: 2025-10-21T23:59:59+00:00
- event_type: other_material
- sentiment: positive
- materiality_score: 0.85
- confidence: high
- sec_items: 2.03, 8.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1526243/000110465925101285/0001104659-25-101285-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1526243/000110465925101285/tm2529203d1_8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001104659-25-101285
- JSON: https://secwatch.observer/filing/0001104659-25-101285.json
- Plain text: https://secwatch.observer/filing/0001104659-25-101285.txt

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