secwatch.observer — SEC 8-K summary
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Issuer:     Core Natural Resources, Inc. (CNR)
CIK:        0001710366
Form:       8-K
Filed at:   2026-05-19T20:02:02+00:00
Accession:  0001710366-26-000045
Event type: regulatory
Sentiment:  neutral
Materiality: 0.10
Item codes: 1.04
LLM model:  deepseek-v4-flash:cloud@v2

Core Natural Resources receives vacated MSHA imminent danger order at Leer South mine
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- Wolf Run Mining LLC subsidiary received 107(a) order on May 13, 2026 for elevated methane at Leer South (Barbour County, WV).
- MSHA terminated the order early on May 14, 2026 after corrective actions.
- On May 18, 2026, MSHA determined no imminent danger had ever existed and vacated the order.
- No production impact or penalties disclosed beyond the reporting requirement.

Source:
  EDGAR index:    https://www.sec.gov/Archives/edgar/data/1710366/000171036626000045/0001710366-26-000045-index.htm
  Primary doc:    https://www.sec.gov/Archives/edgar/data/1710366/000171036626000045/cnr-20260513.htm
  HTML page:      https://secwatch.observer/filing/0001710366-26-000045

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