{"schema_version":"secwatch.filing_event.v1","accession":"0001104659-25-003943","form_type":"8-K","ticker":"CNR","cik":"0001710366","company_name":"Core Natural Resources, Inc.","filed_at":"2025-01-16T23:59:59+00:00","discovered_at":"2026-05-14T18:03:04.538858+00:00","generated_at":"2026-05-28T00:09:23.068411+00:00","sec_items":["7.01","9.01"],"event_type":"other_material","sentiment":"negative","materiality_score":0.75,"calibrated_materiality_score":0.75,"confidence":"high","headline":"Core Natural Resources seals Leer South longwall panel due to combustion; expects longwall resumption mid-2025","bullets":["Temporarily sealing active longwall panel to extinguish isolated combustion-related activity.","Expects to resume continuous miner development within 3 months and longwall mining mid-year.","CEO says loss of around two quarters of longwall production at Leer South.","Plans to apply water and nitrogen; re-entry multi-phased with ventilation controls.","COO cites future mitigation steps in monitoring, degassing, and proactive systems."],"urls":{"canonical":"https://secwatch.observer/filing/0001104659-25-003943","json":"https://secwatch.observer/filing/0001104659-25-003943.json","markdown":"https://secwatch.observer/filing/0001104659-25-003943.md","text":"https://secwatch.observer/filing/0001104659-25-003943.txt","edgar_index":"https://www.sec.gov/Archives/edgar/data/1710366/000110465925003943/0001104659-25-003943-index.htm","edgar_primary_document":"https://www.sec.gov/Archives/edgar/data/1710366/000110465925003943/tm253501d1_8k.htm"},"model":{"generated_by":"deepseek-v4-flash:cloud@v2","generated_at":"2026-05-28T00:09:23.068411+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"}