secwatch.observer — SEC 8-K summary
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Issuer:     Core Natural Resources, Inc. (CNR)
CIK:        0001710366
Form:       8-K
Filed at:   2026-05-04T23:59:59+00:00
Accession:  0001710366-26-000034
Event type: regulatory
Sentiment:  negative
Materiality: 0.30
Item codes: 1.04
LLM model:  deepseek-v4-flash:cloud

Core Natural Resources subsidiary receives imminent danger order at Mountaineer II mine for methane
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- Mingo Logan Coal LLC received a 107(a) order on April 29, 2026 at Mountaineer II mine in Logan County, WV.
- Methane levels exceeded 5.0% in intake entry crosscuts and ranged from 1.0% to 2.2% in the center.
- Mine personnel took prompt actions to alleviate the condition; MSHA terminated the order the same day.
- No injuries or illnesses resulted from the temporary methane accumulation incident.

Source:
  EDGAR index:    https://www.sec.gov/Archives/edgar/data/1710366/000171036626000034/0001710366-26-000034-index.htm
  Primary doc:    https://www.sec.gov/Archives/edgar/data/1710366/000171036626000034/cnr-20260429.htm
  HTML page:      https://secwatch.observer/filing/0001710366-26-000034

License: Source filings: public domain (SEC EDGAR). Summaries (headline + bullets): CC-BY-4.0; attribute https://secwatch.observer