EMPLOYEE WAS OPERATING A 24O TON DIRT HAUL TRUCKWAS SETTING UNDER A SHOVEL BEING LOADED WITH DIRT AS THE SHOVEL WAS SWINING INTO BED OF HAUL TRUCK SHOVEL LOST POWER CAUSING SHOVEL BUCKET TO SL AM INTO BED OF HAUL TRUCK, JARRING EMPLOYEE AROUND IN CAB, INJURING HER RIGHT SHOULDER.