During mining on the L/W face an uncharted gas well was exposed. Methane gas in excess of 1.5% inundated the area and caused monitors on the shearer and L/W Tailgate to de-energize the section power. Curtain was installed to ventilate the area to reduce the CH4 level. The exposed well was later plugged and minded through. There were no injuries or damages as a result of the event.