US Mine Safety and Health Administration spokeswoman Amy Louviere told ILN that the driver, whose name was not released, was operating a Cat 777 haul truck at Blaschak Coal’s Logan surface mine in Colombia County.
He became trapped in the vehicle when it came to a rest at the bottom.
It was not known how far the victim and truck fell.
Louviere said the driver was rescued from the wreckage at 12.12pm local time.
She earlier confirmed that a crane would be needed to lift the unit as part of the efforts to pull the worker out.
“[The] miner is alive and receiving medical treatment,” she said Wednesday afternoon, adding that the individual was being transported to a hospital.
No cause is yet known but MSHA personnel responded and were onsite at press time.
The Blaschak anthracite mine near Mahanoy City in Conyngham Township is controlled by Blaschak Holding.