---
schema_version: "secwatch.filing_event.v1"
accession: "0001628280-23-023332"
form_type: "8-K"
ticker: null
cik: "0001571371"
company_name: "Summit Materials, LLC"
filed_at: "2023-06-23T23:59:59+00:00"
generated_at: "2026-06-13T18:01:11.848416+00:00"
event_type: "regulatory"
sentiment: "negative"
materiality_score: 0.15
calibrated_materiality_score: 0.15
confidence: "high"
source: SEC EDGAR
---

# Summit Materials receives MSHA imminent danger order at Norris Quarries plant, quickly resolved

## Summary
- MSHA issued 107(a) order on June 21, 2023, during routine inspection of Norris Quarries Plant #65 near Savannah, MO.
- Three miners observed working at ~15 ft without fall protection; order terminated same day after corrective action.
- No injuries or damages; mine returned to normal operations.
- Item 1.04 disclosure under Dodd-Frank Section 1503.

## SEC filing metadata
- accession: 0001628280-23-023332
- form_type: 8-K
- cik: 0001571371
- company_name: Summit Materials, LLC
- filed_at: 2023-06-23T23:59:59+00:00
- event_type: regulatory
- sentiment: negative
- materiality_score: 0.15
- calibrated_materiality_score: 0.15
- confidence: high
- sec_items: 1.04, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1571371/000162828023023332/0001628280-23-023332-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1571371/000162828023023332/sum-20230621.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001628280-23-023332
- JSON: https://secwatch.observer/filing/0001628280-23-023332.json
- Plain text: https://secwatch.observer/filing/0001628280-23-023332.txt

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