Short answer
Core Natural Resources, Inc. (CNR) filed an 8-K current report with the SEC on May 4, 2026 reporting Item 1.04 (Mine Safety: Reporting of Shutdowns and Patterns of Violations). Imminent danger order issued at Mountaineer II mine for methane exceeding 5.0% near energized equipment.
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
- Imminent danger order issued at Mountaineer II mine for methane exceeding 5.0% near energized equipment
- MSHA terminated the order the same day after personnel restored acceptable methane levels
- No injuries or illnesses reported from the temporary condition
- Short-lived operational and regulatory disruption, with potential safety scrutiny at the Logan County, West Virginia mine
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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