STARTED MINING ON 7A SECTION, #1 ENTRY 67 BLOCK PLUS 80 FEET. A PIECE OF HEAD COAL MEASURING 4"" THICK X 18"" WIDE X 2' LONG FELL FROM BETWEEN ROOF STRAPS. EMPLOYEE LOST BALANCE, CAUGHT SELF WITH RIGHT HAND ON MINER TRAY AT MONITOR. COAL STRUCK HIS RIGHT HAND, AMPUTATING RIGHT INDEX FINGER; 10 SUTURES TO THUMB.