LOOKING UNDER CM BOOM WHEN HE WAS STRUCK ON THE LEFT SIDE OF THE FACE AND RIGHT WRIST WITH A PIECE OF SHALE 1/2""X 10""ROUND THAT FELL FROM BETWEEN ROOF CHANNEL ON 24"" CENTERS. HE SUSTAINED A LA CERATION TO THE FACE THAT REQUIRED 11 SUTURES & A FRACTURED RT. WRIST.