{"schema_version":"secwatch.filing_event.v1","accession":"0001710366-25-000035","form_type":"8-K","ticker":"CNR","cik":"0001710366","company_name":"Core Natural Resources, Inc.","filed_at":"2025-12-18T23:59:59+00:00","discovered_at":"2026-05-14T18:02:40.229814+00:00","generated_at":"2026-05-16T12:45:40.346629+00:00","sec_items":["7.01","9.01"],"event_type":"other_material","sentiment":"positive","materiality_score":0.65,"confidence":"high","headline":"Core Natural Resources resumes longwall operations at Leer South mine; West Elk productivity normalizes","bullets":["Leer South longwall restarted after being idle since Jan 13, 2025 due to combustion-related activity.","Affected area permanently sealed; equipment (209 shields, shearer, etc.) recovered in good condition.","West Elk mine now at consistent productivity levels following B-Seam transition; expects continued improvement.","Company expects significant 2026 step-up from restart, better West Elk conditions, insurance recoveries, and merger synergies."],"urls":{"canonical":"https://secwatch.observer/filing/0001710366-25-000035","json":"https://secwatch.observer/filing/0001710366-25-000035.json","markdown":"https://secwatch.observer/filing/0001710366-25-000035.md","text":"https://secwatch.observer/filing/0001710366-25-000035.txt","edgar_index":"https://www.sec.gov/Archives/edgar/data/1710366/000171036625000035/0001710366-25-000035-index.htm","edgar_primary_document":"https://www.sec.gov/Archives/edgar/data/1710366/000171036625000035/cnr-20251218.htm"},"model":{"generated_by":"deepseek-v4-flash:cloud@v2","generated_at":"2026-05-16T12:45:40.346629+00:00"},"review":{"review_status":"machine_generated","human_reviewed":false,"corrected":false,"correction_note":null,"correction_timestamp":null,"superseded_by":null,"related_filings":[]},"source_grounded_claims":[],"license":"Source filings: public domain (SEC EDGAR). Summaries (headline + bullets): CC-BY-4.0; attribute https://secwatch.observer"}