AT THE TIME OF THE INJURY, THE INJURED EE WAS OPERATING A CAT 793 ROCK TRUCK. HE WAS IN THE PROCESS OF BEING LOADED BY THE ELECTRIC SHOVEL. DURING ONE OF THE PASSES (SWINGS) THE SHOVEL STRUCK THE SIDE OF THE TRUCK BED. THE SUDDEN IMPACT CAUSED THE INJURED TO BE THROWN, RESULTING IN NECK & ARM PAIN.