Core Natural Resources resumes longwall operations at Leer South mine; West Elk productivity normalizes

Core Natural Resources, Inc.

Leer South longwall restarted after being idle since Jan 13, 2025 due to combustion-related activity.
Affected area permanently sealed; equipment (209 shields, shearer, etc.) recovered in good condition.
West Elk mine now at consistent productivity levels following B-Seam transition; expects continued improvement.
Company expects significant 2026 step-up from restart, better West Elk conditions, insurance recoveries, and merger synergies.

item 7.01 item 9.01

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