EE traveled to get backsight in order to advance survey station in the #5 entry of the 2nd Butt Right off of South Mains section. The backsight was outby a run-thru check curtain. He was struck by a loaded shuttle car as it traveled from the #6 face to the feeder through the run-thru check, and incurred fatal injuries. He was found by the shuttle car operator on his return trip.