DIVERTER NOT FULLY CLOSED, ALLOWING GILSONITE TO BUILD-UP ON BUTTERFLY GATE. EMPLOYEE FAILED TO TURN OFF & LOCKOUT BIN FEEDER. EE WAS ATTEMPTING TO EXPLORE/CLEAN OUT BUILD-UP WHEN HE PLACED HIS RT. HAND INTO THE OPERATING FEEDER. EE'S (3)MIDDLE FINGERS WERE AMPUTATED, DISTAL TO MIDDLE JOINT.