EE WAS OPENING A HATCH ON ROTARY FEEDER FOR 53CM02 COKE MILL WHEN HE LOST HIS GRIP ON THE DOOR WITH HIS RIGHT HAND. THE DOOR (HINGED ON BOTTOM) DROPPED OPEN, PINCHING EE'S LEFT HAND AGAINST THE HOUSING. RESULTED IN HAIRLINE FRACTURE TO LEFT INDEX FINGER. (FINGER DID NOT HEAL; SURGICAL IMPLANT OF PIN REQUIRED.)