ADVANCE MINING WAS BEING CONDUCTED IN THE #6 ENTRY 36 INBY SPAD #1251 WHEN AN UNCHARTED GAS WELLWAS CONTACTED BY THE CONTINUOUS MINER RIPPER HEAD. THE OUTER CASINGS OF THE WELL WERE DAMANGED; THE MAIN PRODUCTION PIPE CASING WAS NOT DAMAGED.NO INJURIES & VENTILATION WAS NOT INTERRUPTED. ENTIRE MINE WAS EVACUATED, POWER PULLED, FEDERAL& STATE AGENCIES NOTIFIED.