A GOLF CART BROKE DOWN & WAS SENT TO SURFACE TO BE REPAIRED. AN ENDLOADER WAS USED TO PICK CART OFF LOWBOY - WHEN LOAD WAS PICKED UP IT WAS NOT CENTERED. THE MINE FOREMAN STOOD ON END OF CART TO BALANCE LOAD. WHEN LOAD WAS MOVED, CART SHIFTED ON FORK OF ENDLOADR CAUSING CART TO FLIP MINE FOREMAN IN AIR AND FALL TO GROUND ON HIS BACK.