---
schema_version: "secwatch.filing_event.v1"
accession: "0001493152-25-014390"
form_type: "8-K"
ticker: "USGO"
cik: "0001947244"
company_name: "U.S. GoldMining Inc."
filed_at: "2025-09-22T23:59:59+00:00"
generated_at: "2026-05-17T06:01:02.637101+00:00"
event_type: "other_material"
sentiment: "positive"
materiality_score: 0.7
calibrated_materiality_score: 0.7
confidence: "high"
source: SEC EDGAR
---

# Whistler gold recovery improves to 85.3% via flotation+leach, up 22% from prior test

## Summary
- Combined flotation and cyanide leach achieved 85.3% Au, 79.1% Cu, 55.3% Ag recoveries.
- Copper concentrate graded 23.7% Cu with 0.6% mass pull; leach recovered additional 31.2% Au from tails.
- Previous metallurgy yielded ~70% Au recovery; new 22% increase due to sequential leach step.
- Test program used master composite representing average Whistler deposit resource grade (0.68 g/t AuEq).
- Results provide key inputs for the ongoing Preliminary Economic Assessment (PEA).

## SEC filing metadata
- accession: 0001493152-25-014390
- form_type: 8-K
- ticker: USGO
- cik: 0001947244
- company_name: U.S. GoldMining Inc.
- filed_at: 2025-09-22T23:59:59+00:00
- event_type: other_material
- sentiment: positive
- materiality_score: 0.7
- calibrated_materiality_score: 0.7
- confidence: high
- sec_items: 7.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1947244/000149315225014390/0001493152-25-014390-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1947244/000149315225014390/form8-k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001493152-25-014390
- JSON: https://secwatch.observer/filing/0001493152-25-014390.json
- Plain text: https://secwatch.observer/filing/0001493152-25-014390.txt

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