A methane ignition occurred in face of #3 Right crosscut on 5 Right Section, 26' right handed of survey station #23740. Ignition occurred when sandstone roof fell in cut while continuous miner rippers were running. Ignition occurred approx 30' from face on left rib. Flame duration was approx 6-8 seconds, & was extinguished w/fire extinguisher. No injuries, no equip damaged.