Short answer
Core Natural Resources, Inc. (CNR) filed an 8-K current report with the SEC on May 19, 2026 reporting Item 1.04 (Mine Safety: Reporting of Shutdowns and Patterns of Violations). Leer South mine received a section 107(a) imminent-danger order on May 13 over elevated methane concentrations.
Core Natural Resources, Inc. 8-K event analysis
AI summary of each reported item and its exhibits
Item 1.04 · Mine Safety: Reporting of Shutdowns and Patterns of Violations
- Leer South mine received a section 107(a) imminent-danger order on May 13 over elevated methane concentrations
- MSHA terminated the order early on May 14, limiting potential operational disruption
- MSHA vacated the order on May 18 after determining no imminent danger had existed
- Event underscores mine-safety and regulatory risk, but no continuing enforcement action is indicated
Generated from the filing text and exhibits; verify against the original. What 8-K item codes mean
Other Core Natural Resources, Inc. 8-K filings
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