EMPLOYEE WAS BOLTING ON MINER 8A SECTION, HAD STARTED MINING IN #2 ENTRY MINING FROM 82 TO 83 BLOCK. HAD TESTED AREA WITH SLATE BAR 5 TO 10 MINUTES PREVIOUSLY. CONTINUED TO BOLT. A PIECE OF COAL FELL STRIKING EMPLOYEE ON LEFT SHOULDER AND NECK. COAL MEASURED 2' X 2' & UP TO 10"" THICK. HE CONTINUED TO WORK UNTI 12/1/04. RECEIVED DIAGNOSIS 12/6/04.