New technique vacuums gob gas. Cross-measure boreholes controlled longwall gob gas at a Bethlehem mine.
Campoli AA; Cervik J; Burns F
Coal Min Process 1983 Mar; 20:48-51
The cross-measure borehole technique is being developed jointly by the Bureau of Mines and Bethlehem Mines Corp. as an alternative to current U.S. longwall methane control techniques. Small-diameter inclined boreholes are drilled from underground locations into roof strata that will be fractured when the longwall panel is removed. Methane contained in the fractured strata is collected in the cross- measure boreholes and drawn through an underground pipeline to a central surface borehole by a vacuum pump.
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