Core Natural Resources (CNR) Resumes Longwall Operations at Leer South Mine

The share price of Core Natural Resources, Inc. (NYSE:CNR) surged by 3.98% between December 12 and December 19, 2025, putting it among the Energy Stocks that Gained the Most This Week.

Core Natural Resources (CNR) Resumes Longwall Operations at Leer South Mine

Core Natural Resources, Inc. (NYSE:CNR) is a world-class producer and exporter of high-quality, low-cost coals, including metallurgical and high calorific value thermal coals.

Core Natural Resources, Inc. (NYSE:CNR) received a boost on December 18 when the company revealed that it had resumed longwall operations at its Leer South metallurgical mine in West Virginia. The longwall operations at the site had been idle since the beginning of the year due to a combustion-related event. The company sealed the affected area of the mine and successfully retrieved its equipment, which was generally in good condition despite the prolonged shutdown.

Core Natural Resources, Inc. (NYSE:CNR) now expects a significant improvement in financial performance due to the restart at Leer South. Moreover, the company reported that its West Elk longwall mine in Colorado is also now operating at consistent productivity levels following its transition to the B-Seam.

Jimmy Brock, Chairman and CEO of Core Natural Resources, Inc. (NYSE:CNR), commented:

“On behalf of the entire board and management team, I commend the operations team for making safety their highest priority in the successful recovery, repositioning, and restart of the longwall system. In addition, we want to again extend our appreciation to federal, state and local regulatory officials for their collaboration and support. Leer South is a highly strategic asset, and we fully expect this world-class operation to execute at a high level in 2026 and beyond. While the issues at Leer South and West Elk adversely affected Core’s performance in 2025, we are looking forward to strong cost improvement and profitability at both these operations going forward.”

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