Core Natural Resources subsidiary receives imminent danger order at Mountaineer II mine due to elevated methane

Core Natural Resources, Inc.

Mingo Logan Coal LLC received a 107(a) order on January 8, 2026 at the Mountaineer II mine in Logan County, West Virginia.
An inspector found elevated methane levels in an isolated section; mine personnel restored acceptable levels promptly.
The Mine Safety and Health Administration terminated the order, and no injuries or illnesses resulted.
Core Natural Resources, Inc. (NYSE: CNR) is the parent company of Mingo Logan Coal LLC.

item 1.04

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