Core Natural Resources receives vacated MSHA imminent danger order at Leer South mine

Core Natural Resources, Inc.

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.

item 1.04

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