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11th February 2016 Ventilation Audit MRE

POINTS TO NOTE

THE SIG SYSTEM is the tool used in the audit by the DNRME. Its use and the associated MRE also
dated the 11th February touch on areas such as Contractor Management and Respirable Dust

Regulation 340 – VO Appointment
May hold another position provided performance of VO role is unaffected
Did Mr. Bobeldyk hold another position?
If so what? Not stated yes or no.
Mark Bobeldyk (Linked in profile)
• Develop and Implement Ventilation, Outburst, Spontaneous Combustion and Gas Drainage SHMS
documentation from Project to Operating Mine.
Transitioned ownership of Seamgas budget and resources to site through SLT support.
• Held Superintendent and Statutory V.O Position for period of tenure.
• Implement and optimize Ventilation, Bulk Air Cooling and Gas Drainage underground networks in
collaboration with Anglo Technical Principals.

Adequate Ventilation.
This is first indication of how ventilation restricted the Mine is
A Heading single return for 11 cut-throughs (approx. 1km at an estimate) with first balancing overcast
at 11 cut through.
Poor design. Have high resistance built into the mine from the start. The mine ventilation system is
automatically running at a higher resistance than desirable, it causes the mine to run at less ventilation
capacity per second (expressed in cubic metres per second.
The second last sentence about how panels will be ventilated using refrigeration and shafts in the gate
roads shows how the mine is ventilation restricted on the return side. They are trying to fix the problem
by increasing the number and capacity of the intake.
An analogy would be the Brisbane airport tunnel is not carrying enough traffic. Instead of fixing the end
bottleneck you just put more feeder roads in and make it toll free and then wonder why the no matter
how many more feeder roads you put in, only so much traffic can come out.
Mark Bobeldyk designed this.

The Ventilation Plan.
If the key is not legible except when printed to full size control document (not stated) then what good is
it?
Does not seem to be any documented process that has a documented inspection reporting process that
the VCD is being constructed as specified including keying into the rib and installation of anchors if
necessary
Monthly Ventilation Surveys
There is a Six (6) day gap between VO and Mine Manager signing off.
GRO-69-SOP – Action Taken if Methane is Detected
Post ventilation change summary – EG Opened Mains AB 1 ICT Regulator 14 August 2015
How does this relate to action for excess methane?
Is it the only document that could be found?

GRO-2956-FRM – Ventilation Control Device Defect
*Practical evidence was seen during the inspection of good quality stoppings.
No mention of meeting design criteria. Mentions looks visually good quality. Any process of sign off
sheets audits to ensure VCD is constructed to standard; eg anchored to strata as required.

If GB > 25% CH4 then deemed dangerous withdrawal required other than transient
Documentation provided was –
TARP-3442- Evacuation Triggers
Given the circumstances two days previously no mention of sighting when and how many times it has
been enacted

3.0 Close-out Comments
The Mine has a robust well documented system. A small sample of the system was examined with, in
most cases practical evidence of effective implementation.
The Mine is relatively uncomplicated at present but it is anticipated that the future will present more
challenging conditions especially in regard to working temperatures and effective pre-drainage of
methane from Goonyella Middle seam and surrounding strata.
POINTS TO MEASURE FUTURE EVENTS AND VENTILTION AND METHANE AGAINST

11.02.2016 Vent audit MRE + Comments – Grosvenor Coal Mine –

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