A small ignition of gas was experienced at 1:15 P.M. on 8-21-07. The incident occurred in the face of #1 entry on MMU001-1. Rock obstruction was contacted by miner creating a spark which ignited a bleeder at base of rock obstruction. A flame of 3' in length & 6"" in diameter came from the face. The miner was at the 20' mark of a 40' cut. MSHA Inspector came to investigate