US Mine Safety and Health Administration spokesperson Amy Louviere told ILN Thursday morning that the incident occurred Wednesday at 10am local time at Arch Coal’s Slone Branch operation in Knott County.

Slone Branch is part of the ICG Knott County complex, one of the International Coal Group mines Arch acquired earlier this year in its takeover of the company.

State Office of Mine Safety and Licensing spokesperson Linda Potter confirmed that the injured miner was David Bolen, 52, of Pinetop.

“He was struck in the back when a piece of draw rock fell from the roof,” she said.

“He was transported by ambulance to the McDowell ARH Hospital in McDowell … [and] released.”

The OMSL also noted that it sent a roof inspector underground to evaluate the accident scene. A federal review has also commenced.

The ICG Knott County complex, according to Arch records, produced 400,000 tons in 2010.

Production from the underground continuous miner sections is sent to the Supreme Energy preparation plant, where it is delivered to customers via CSX rail.