5
likely to be working. During each test, twenty 60-second
samples were taken, along with additional samples at the
17.5, 20, and 25-minute marks. The gas inflow timeline for
each test scenario ranged from 15.5 to 16.5 minutes.
Figure 5 illustrates the gas flow paths for a 340-cfm
inflow test scenario. The inserted gas flows directly towards
the tailgate entries, moving inby the longwall face towards
the BEP and the mine bleeder fan. In this scenario, minimal
gas flows toward the GVB, and the longwall face remains
Figure 4. Breached gas inlets to the mine
Figure 5. Gas flow path and GC sample results at the sampling locations
likely to be working. During each test, twenty 60-second
samples were taken, along with additional samples at the
17.5, 20, and 25-minute marks. The gas inflow timeline for
each test scenario ranged from 15.5 to 16.5 minutes.
Figure 5 illustrates the gas flow paths for a 340-cfm
inflow test scenario. The inserted gas flows directly towards
the tailgate entries, moving inby the longwall face towards
the BEP and the mine bleeder fan. In this scenario, minimal
gas flows toward the GVB, and the longwall face remains
Figure 4. Breached gas inlets to the mine
Figure 5. Gas flow path and GC sample results at the sampling locations