A MINE EMPLOYEE FELL APPROXIMATELY 4.5 FEET FROM THE BACK OF A FRONT END LOADER WHILE ATTEMPTING TO DISLODGE A TIRE THAT HAD FALLEN AGAINST THE RADIATOR COWLING. THE TIRE WAS BEING USED AS A M ERKER TO PREVENT THE OPERATOR FROM EXCAVATING NEAR A PROCESS LINE. WHEN THE EMPLOYEE FELL HE TRIED TO BREAK HIS FALL WITH HIS LEFT ARM, THE IMPACT RESULTED IN A MINOR FRACTURE TO HIS LEFT WRI