Longwall Methane HPI’s Grosvenor 2017 to 1st July 2019. 24 HPI’s in 2018. 16 HPI’s 1st Jan to 1st July. 5.47% CH4 Peak (Explosive). All outside Inquiry Time Frames
There are 2 in 2017 and 24 in 2018.
Methane HPI Tables 2017 and 2018
There are 16 Methane HPI’s in the Longwall in the 6 months till 1st of July that I am aware of
Methane Longwall HPI Tables 1st Jan 1st July 2019
Included in this is an exceedance for eight hours where it peaked at 5.47% CH4 (Explosive) at 11:48 pm on the 31st May 2019 at a tailgate sensor.
A cavity was reported in the tailgate at chocks 142 to 140 with partial airway obstruction.
This Post Has 4 Comments
All well and good to post the HPI exceedances at Grosvenor, maybe post the responses /directives from the inspectorate for each one. The post can be construed as a continued violation to monitor and apply industry and mine standards to prevent reoccurrence or maybe construed as a lack of control by the inspectorate to monitor apply and enforce industry best practice for the prevention of these HPI’s.
it appears adequate Goaf management (Gas Drainage, ventilation and support) is being neglected by both parties otherwise we would not have 3 mines in the Bowen Basin shut down because of spontaneous combustion or frictional ignition ( to be determined) within the past 4 years.
Bruce I published multiple mine records book entries
https://www.qldminingcrisis.com.au/category/underground-coal-mine-safety/explosions/grosvenor/page/9/
https://www.qldminingcrisis.com.au/2020/10/15/mine-record-entry-march-16th-2018/
Bruce;
You have hit the nail on the head with that question. There are precious few Directives issued over the life of Grosvenor.
It does not matter whether from trapping four men inbye a development fall immediately after deciding to stop inserting megabolts.
Gas exceedance after gas exceedance.
Inrush after inrush.
The mine has not had the methane drained from the floor and roof seams and the ventilation system is incapable of keeping the tailgate of the longwall below 2.5% within a couple of hundred metres in the very first block.
The whole gas drainage system, the design of the mine ventilation and the design of the mine is shown as flawed from the start
I have started making a collection of the Recommendations and Suggestions the Inspectors make over time.
The Inspectors have to answer for themselves which they can starting Tuesday