AT APPROX 1:00, THE SHOVEL OPERATOR AND TRUCK OPERATORS STOPPED FOR LUNCH. THE EQUIPMENT WAS WORKING IN THE PIT EAST OF THE PARKING LOT. THE SHOVEL WAS PARKED ON THE MIDDLE SEAM AND THE TRUCKS WERE PARKED 10 FT ABOVE THE SHOVEL ON THE TOP SEAM. EMPLOYEE WALKED FROM SHOVEL TO TRUCK, HE CLIMBED UP THE SLOPED LOOSE MATERIAL, HE TRIPPED LOSING HIS BALANCE, FALLING TO GROUND.