EE WAS OPERATING THE MINE IN #3 ENTRY OF 001-0 SECTION EE BACKED THE MINOR OUT OF THE RIGHT CUT& WAS PREPARING TO CUT THE LEFT SIDE WHEN THE MINE ROOF BGAN WORKING AT THE FACE. HE WAS WAITING FOR THE DRAW ROCK AT THE FACE TO QUIT FALLING AND WAS 24' OUTBY THE UNSOPPORTED AREA WHEN WITHOUT WARNING A PIECE OF OBLONG SHAPED SLATE MEASRING 42""LONGX73""WX1/16/"" TO 2"" THICK