EE was rehabilitating back in the 344 west just past the 989 cross cut. He finished drilling a 6' hole with jack leg & had pushed the bolt into the hole; there was a plate 8' matt hanging off the bolt. He felt that the bolt was secure. He turned to grab jack leg when he turned back the bolt fell from the hole cut his lip. The injured went & had the cut cleaned and had 13 stitches.