Core Natural Resources updates Leer South restart; delay of up to 4 months, insurance recovery >$100M

Core Natural Resources, Inc.

Mine re-entered June 10; ventilation restored, longwall components in good condition.
On June 26, elevated CO levels forced evacuation and resealing of affected area.
Plan aims to reposition and restart longwall within next four months (Q4 2025).
Reiterates 2025 coking coal sales volume guidance despite delayed restart.
Expects Leer South-related insurance recoveries in excess of $100 million.

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