TRUCK DRIVER WAS BACKED AGAINST A RAMP THAT IS STATIONED ON THE WEST SIDE OF STRIPPING AREA, SO SAFE ACCESS CAN BE ACHIEVED TO SHOVEL DIRTY MATERIAL OUT OF THE CORNERS OF THE BED OF THE HAUL T RUCK. UPON LEAVING, THE DRIVER TOOK A SHORT CUT DOWN THE SIDE OF THE RAMP INSTEAD OF WALKING TO THE END OF THE RAMP AND AROUND TO THE CAB, AND FELL.