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Qld Coal Mining VO Law Exam
Qld Coal Mining VO Law Exam
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Qld Coal Mining VO Law ExamAn auxiliary fan in an underground section is protected by a methane detector that
measures the concentration of methane in the general body. At what concentration of
methane must the detector automatically trip the electricity supply to the auxiliary fan? -
ANS-2%
And the detector located between the LW face and return airway? - ANS-Electricity
supply to LW equipment in the LW face and return airway
At what concentration does a booster fan automatic methane detector automatically
activate an audible and visible alarm to allow the necessary action to be taken
promptly? - ANS-1.25%
At what concentration of methane in the general body, must the electricity supply to non
intrinsically safe plant in the adjacent ERZ1 be automatically switched off by an
automatic methane detector located in the intake airway at the interface between a
NERZ and ERZ1? - ANS-0.5%
At what concentration of methane must hot work be stopped if it is being carried out
underground? - ANS-0.5%
At what concentration of methane must people be withdrawn from a part of a mine that
is required to be ventilated? - ANS-2.5 %
At what concentration of methane must the visual alarm be automatically activated by
an automatic methane detector located in the intake airway at the interface between a
NERZ and ERZ1? - ANS-0.25%
At what concentration, detected by an automatic methane detector on a longwall
shearer, must the electricity supply to the cutters be automatically tripped? - ANS-1.25%
At what concentration, detected by an automatic methane detector on or near a longwall
face, must the electricity supply to equipment on the longwall face be automatically
tripped? - ANS-2%
At what concentrations does the methane detector alarm and trip Non explosion
protected plant? - ANS-Visible alarm at 0.25%,Trips electrical motor or internal
combustion engine at 0.5% Or within 3 minutes if the detector fails
,At what general body concentration would you immediately shut off power to an
explosion protected electrically powered loader, vehicle or plant with a trailing cable? -
ANS-1.25%
At what points underground must the air flow rate be recorded at least once on each
working shift? - ANS-The mine's working faces
Explain what type B, C and D ventilation control devices are and under what conditions
they must be used? - ANS-Type B 35pka (5psi) - naturally occurring flammable gas is
insufficient to reach the lower explosive limit under any circumstances, Type C 140pka
(20psi) - used in areas not mentioned in type B or D, Type D 345kpa (50psi) - if person
remain underground when an explosive atmosphere exists and a possible ignition
source
How are objects of the Act achieved? - ANS-PRIME.
PROVIDE for SHMS to manage risk, SSHR's to represent CMW's, Inspectors/other
officers, Competencies assessed and recognised, Appropriate coal mines rescue
capability, Satisfactory level of emergency preparedness, Health assessments of
workers, Management structures
IMPOSE S&H obligations,
MAKE Regulations and recognised standards, ESTABLISHING, S&H advisory
Committee, Commissioner for Mine Safety and Health
How can obligations be discharged if regulation or recognised standard is made? -
ANS-If regulation prescribes a way of achieving ALARA, follow the prescribed way.
If a regulation prohibits exposure to a risk, ensure prohibition is not contravened.
By adopting and following stated way or way that achieves a level of risk that is equal to
or better
How can obligations be met if no regulation or recognised standard is made? - ANS-By
choosing an appropriate way, taking reasonable precaution and exercising proper
diligence to ensure the safety and health obligation is discharged in relation to the risk
How do you decide if the level of risk is within acceptable limits? - ANS-Have regard to
the likelihood and severity of the injury or illness arising out of the risk
How is an acceptable level of risk achieved? - ANS-Requires mgt and operating
systems be put in place.
, Systems must incorporate Risk Mgt elements & practices to: Identify analyse & assess
risk
Avoid or remove unacceptable level of risk
Monitor the level of risk and the adverse consequences of retained residual risk
Investigate & analyse the causes of serious accidents & HPIs to prevent reoccurrence
Review effectiveness of control measures & take appropriate corrective/preventative
action
Mitigate the potential adverse effect of residual risk Prescribed through regulation
How is the location and type of ERZ determined? - ANS-SSE must ensure risk
assessment is carried out to identify the location and type of each ERZ
How long is a single entry drive? - ANS-A drive longer than 350m
How long is a temporary absence for a Ventilation Officer? - ANS-The UMM may
assume the duties of the VO during the absence if the absence is for not longer than 7
days and the manager holds a ventilation officer's certificate of competency.
How many temporary stoppings can be installed in a line of ventilation stoppings
separating intake from return? - ANS-No more than 2 immediately adjacent to the last
line of cut-throughs in the panel unless a separate panel is to be developed and there is
a plan for installing permanent VCDs
How must each device operate if it detects a significant departure from the fan's normal
operating parameters? - ANS-Triggers a visible alarm; and Trips the electricity supply to
the fan; and Records the date and time of the action.
How often must a worker holding a certificate of competency be given refresher training
under a mine training scheme? - ANS-At least once every 5 years
How often must the air quality and flow rate be measured in each return airway at a
main upcast fan? - ANS-At least once each month
How often must the operation of each airlock installed for an entrance at the mine be
tested, other than pressure tested? - ANS-At least once per year
If a continuous miner is fitted with 2 automatic methane detectors where are they
located and what are their trip settings? - ANS-Near cutters- alarm at 1%, trip cutters at
2%, General Body- alarm at 1%, trip power to machine at 2%
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