ROOF BOLTER OPERATOR WAS INSTALLING A DYWIDAG ROOF BOLT APPROXIMATELY 15 FEET OUTBY THE FACE, ENTRY 2, XC 20-21, 22 HEADGATE. WHILE SPINNING THE BOLT, THE WRENCH CAME IN CONTACT WITH THE METAL MAT, CAUSING FRICTION THAT IGNITED METHANE. WATER AND A FIRE EXTINGUISHER WERE USED TO COOL AND EXTINGUISH THE FLAME.