Development Methane >2.5% HPI’s Floor Blowers inbye 21 cut-through in gate roads. All outside the Board of Inquiry Time Frame.
Between 2017 and June 2019 I am aware of some 13 Methane HPI’s that occurred in Development.
All of these fall outside the terms of reference time frames
Eight of these are associated with Floor Blowers from the Goonyella Lower Seam and “Floor Heave”.
All of these are noted after about 21c/t in MG 103 and 104.
This event occurred on the 17th of January 2019 and lasted 30 minutes and reached over 5%.
You do not need to resurrect Albert Einstein to that having floor blowers in development means that there will be a major problems during longwall extraction.
A floor heave event occurred releasing CH4 gas into working face in MG104. The Gas release event caused the Continuous Miner to trip power on the GB gas sensor and the development crew withdrew from the area.
Hand held Gas Detector at the continuous miner recorded peak readings of 5% CH4.
The outbye general body gas sensor at the dogleg read a peak of 0.45% CH4.
The internal Methane monitors in the Auxiliary fans recorded peak readings of 2.36% and 2.97% CH4 respectively. Ventilation at working face with both aux fans running was 30m3sec
