Core Natural Resources subsidiary receives imminent danger order at Mountaineer II mine for methane

Core Natural Resources, Inc.

Mingo Logan Coal LLC received a 107(a) order on April 29, 2026 at Mountaineer II mine in Logan County, WV.
Methane levels exceeded 5.0% in intake entry crosscuts and ranged from 1.0% to 2.2% in the center.
Mine personnel took prompt actions to alleviate the condition; MSHA terminated the order the same day.
No injuries or illnesses resulted from the temporary methane accumulation incident.

item 1.04

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