{"url_path":"/sec/cnr/8-k/2026-05-19/item-1-04","section_key":"item-1-04","section_title":"Item 1.04 Mine Safety – Reporting of Shutdowns and Patterns of Violations.","topic":"sec","document":{"doc_type":"8-K","doc_date":"2026-05-19","source_url":"https://www.sec.gov/Archives/edgar/data/1710366/0001710366-26-000045-index.html","accession_number":"0001710366-26-000045","cik":"0001710366","ticker":"CNR","issuer_name":"Core Natural Resources, Inc.","edgar_url":"https://www.sec.gov/Archives/edgar/data/1710366/0001710366-26-000045-index.html","primary_entity_key":"0001710366","primary_entity_name":"Core Natural Resources, Inc."},"word_count":170,"has_tables":true,"body_markdown":"Item 1.04 Mine Safety – Reporting of Shutdowns and Patterns of Violations.\n\nOn May 13, 2026, Wolf Run Mining LLC, a subsidiary of Core Natural Resources, Inc., received an imminent danger order under section 107(a) of the Federal Mine Safety and Health Act of 1977 at the Leer South mine located in Barbour County, West Virginia. The order stated that an inspector found elevated methane concentrations in an area of the mine. The Mine Safety and Health Administration (“MSHA”) terminated the 107(a) order early on May 14, 2026, and after further discussion between Leer South’s mine management and MSHA, on May 18, 2026, MSHA determined that an imminent danger had never existed and the order was vacated.\n\nSIGNATURES\n\nPursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.\n\nCore Natural Resources, Inc.\n\n(Registrant)\n\nBy: /s/ MITESHKUMAR B. THAKKAR\n\nMiteshkumar B. Thakkar\n\nPresident and Chief Financial Officer\n\nDated: May 19, 2026"}