9th May 2018 Floor Blowers in Goaf Methane HPI’s Grosvenor Mine?

The Mine Record Entry notes the last 2 appeared to be as a result of floor blowers in goaf.

The Inspectors reference what occurred at Cental Colliery.

A 24 page Report from Central Colliery in 2004 is attached

It was explained that the last two HPl’s appeared to be a result of floor blowers in the goaf. These coincided with high loading on LW shields and it is believed that this loading may be as a result of the thickening of overlying sandstone in the roof strata. Analysis is being undertaken to verify this, The Longwall has approximately 300m to retreat to clear this zone.

We explained that Central Colliery had significant issues with floor blowers and had success by drilling UIS holes into the seam below. These holes did not produce a lot of gas but acted to relieve the pressure so that at times of cyclic loading the floor blowers were effectively eliminated.

Central Colliery 312 German Creek Lower CH4 Floor Blower Review Sept 2004