EE WAS STANDING IN THE HEADING BI 7280 ATTEMPTING TO HELP THE LHD OPERATOR CLEAR THE HEADING FOR BOLTING. HE HAD APPROX 4' OF CLEARANCE UNTIL THE R FRONT WHEEL OF THE LHD FELL INTO A HOLE WHIL E BACKING THROUGH A TURN. HE SAW THAT THE BUCKET WAS CLOSE AND PUT UP HIS RIGHT ARM TO PROTECT HIMSELF WHEN IT BECAME PINCHED FROM THE HAND TO THE ELBOW AND BUCKET TO RIB. FRACTURED HIS ULNA