WHILE HOISTING ORE FROM THE MINE TO THE SURFACE, THE HOIST WOULD NOT MOVE AFTER THE SKIP WAS FILLED. AN IMMEDIATE INVESTIGATION REVEALED A PROBLEM WITH THE AIR PRESSURE AND THE BRAKE WOULD NOT RELEASE. THE HOIST OPERATOR CALLED AN ELECTRICIAN, THEN CALLED THE SHIFT FOREMAN ON DUTY IN THE MINE. ALL PRODUCTION IN THE MINE HAD ALREADY STOPPED AS THE CREWS WERE MAKING SHIFT CHANGE.