Core Natural Resources subsidiary Mingo Logan Coal received and had terminated an imminent danger order on April 29, 2026, at Mountaineer II mine due to elevated methane levels, with no injuries reported.
Key takeaways
Mingo Logan Coal LLC received 107(a) imminent danger order on April 29, 2026, at Mountaineer II mine in Logan County, West Virginia.
Order due to methane levels exceeding 5.0% between intake entry and stopping line, and 1.0%-2.2% in intake entry center with energized equipment.
Mine personnel promptly alleviated condition and restored acceptable methane levels.
MSHA terminated the order on the same day.
No injuries or illnesses resulted from the temporary condition.