The storm hit the Jefferson County operation late Wednesday and damaged the preparation plant and overland conveyor system as well as other infrastructure.

“All mine operations employees are accounted for and safe with no known injuries at this point in time,” the company said.

However, the company believed the damaged infrastructure will have an impact on future deliveries to its customers.

“[I]t is extremely early in the damage assessment process being conducted by its operations team, and therefore, difficult to accurately forecast potential business impact,” an official said.

The large string of storms has torn through seven southeastern US states and is responsible for more than 250 fatalities. Many have occurred in Alabama.

The Oak Grove mine in Adger, opened in 1975, extracts metallurgical coal from the Blue Creek seam. It employs approximately 310 workers, and produced 877,000 tons in 2009.