Core Natural Resources seals Leer South longwall panel due to combustion; expects longwall resumption mid-2025

Core Natural Resources, Inc.

Temporarily sealing active longwall panel to extinguish isolated combustion-related activity.
Expects to resume continuous miner development within 3 months and longwall mining mid-year.
CEO says loss of around two quarters of longwall production at Leer South.
Plans to apply water and nitrogen; re-entry multi-phased with ventilation controls.
COO cites future mitigation steps in monitoring, degassing, and proactive systems.

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