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50 Advanced Mine Ventilation
Figure 4.6 Ventilation layout for a longwall panel in very gassy coal seams.
in-mine horizontal drilling to remove nearly 70% of in-place gas before mining as
shown in Fig. 4.7. Horizontal boreholes are drilled at 200- to 300-foot intervals and
are extended beyond the longwall panels to intersect and degas the next development
section.
Figure 4.7 Degasification plan for a longwall panel in very gassy coal seams.
