Use of vertical boreholes for assisting ventilation of longwall gob areas.
Washington, DC: U.S. Department of the Interior, Bureau of Mines, TPR-13, :1-6
An experimental degasification program using a vertical borehole and vacuum pump to drain gas from the gob area of a longwall panel was successful at Bethlehem Mines Corporation, Cambria Division, No. 33 coal mine. Sixty-one million cubic feet of methane has been exhausted during a 9-month period . Daily production time in the panel increased as a result of lower methane levels in the returns . Removal of large quantities of methane in this way and the exclusion of it from the ventilating system will provide reduced cost in mine ventilation and provide a safer environment for the mine.
Mine-gases; Mining-industry; Methanes; Methane-drainage; Methane-control; Underground-mining; Longwall-mining; Coal-mining; Explosive-gases; Explosive-atmospheres
Washington, DC: U.S. Department of the Interior, Bureau of Mines, TPR-13