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ERZ Studies. > 08---Tuesday---Mine General Questions > Flashcards

08---Tuesday---Mine General Questions Flashcards

1
Q

What is the purpose of Mine ventilation? List 4

A

Purpose to:
Provide at least 0.3m/s (V)(s344)
A general body concentration of CO2 < 1.25%, CH4 < 2.5% and O2 > 19% (s 343) and SCHEDULE 6
Intake airways provide clean uncontaminated air to work areas.
Return airways take heat, moisture, gas and dust away from the face and goaf areas.

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2
Q

List in order how we populate a mine Plan?

A

1) LABEL HEADINGS
2) CONVEYOR
3) VENTILATION
4) MINING EQUIPMENT AND SEQUENCE
5) ELECTRICAL INSTALLATIONS
6) GAS MONITORING
7) SERVICES
8) EMERGENCY RESPONSE
9) COMMUNICATION
10) STONEDUSTING
11) SIGNAGE

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3
Q

Why do we label Headings? List 4

A

LABEL HEADINGS
Gives us a reference point for areas underground
Cut throughs and Headings (populate outbye to inbye)
Allows identification of:
Where items are installed/stored
Personnel are working
Operations are taking place
Roadways/headings labelled alphabetically as ABCDE etc.
Cut throughs numbered.

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4
Q

list what is in the sections 256, 257 and 258 with respect to Conveyor belts?

A

s256
Certified FRAS conveyor belting and drum lagging
emergency stop system capable of being activated at any length along the conveyor where persons have access
s257
SHMS must provide for designing, installing, inspecting and maintaining
System must provide for circumstances in which stop conveyors must be inspected before being restarted
S258
Can?t ride on belt unless belts is designed for that purpose or
Cross over or under unless at designated cross over points
SHMS must have protection when travelling underneath conveyor

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5
Q

List advantages and disadvantages with Flanking returns?

A

Flanking returns
Ability to mine off each side of the mains
Rib emissions vent straight to returns
Decrease pressure differential across seals and stopping?s
More stopping?s required
Balancing roadway of overcast needed

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6
Q

Detail a production development VCD between an intake and a return? Pressure signage etc

A

14kPa (capable of withstanding an overpressure)
Stopping?s/ overcast/ regulators that are part of the panel ventilation system.
Max 6m from rib line
Man door on everyone for FF purpose (open towards intake ?CAUTION ENTERING ERZ1? sign were applicable)

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7
Q

Detail a production Mains VCD between an intake and a return? Pressure signage etc

A

35kPa (capable of withstanding an overpressure)
Stopping?s/ overcast/ regulators that are part of the main ventilation system.
Man door on every 2nd(open towards intake/ 1.5m from rib line/ min 0.3 & max 0.6 from floor/ ?CAUTION ENTERING ERZ1? sign were applicable)

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8
Q

Detail a Brattice VCD between an intake and a return? Pressure signage etc

A

Separation stoppings for primary escapeways
FRAS
Of substantial construction providing for minimal leakage
Separate conveyor roadways from primary (due to risk of fire/ heat/ dust)
Non rated, Cook use 14kPa stoppings
Man door on everyone for FF purpose(open towards intake)

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9
Q

What is a regulator used for?

A

Regulators
Used to regulate the flow of air (adding resistance)
Have a airlock were applicable (4m long)

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10
Q

What is a overcast used for?

A

Overcast
Separate airways
Intake & return air to cross
Machinery/ personnel and conveyor access through return airways

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11
Q

What is a machine door used for?

A

Machine doors
Required for mobile equipment access
Used so significant disruption to the mines ventilation circuit does not occur e.g. intake to return airways (similar to an airlock)
Doors open towards intake (min 20m apart to allow machine and attachment)

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12
Q

what is a coffin seal used for?

A

Coffin seal
Allows the belt to run from homotropal return airway to intake airway with minimal leakage.
Possible location for accumulation of coal and fines

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13
Q

What is brattice made of?

A

Brattice
FRAS
Spraying the floor and roof and using snap jacks/telescopic poles, reduces leakage and enable efficiency of a sail to be extended 100m.

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14
Q

SEALS (provide a high resistance barrier between the general body workings and sealed atmospheres What is a Type B seal used for? And what overpressure can they withstand?

A

SEALS(provide a high resistance barrier between the general body workings and sealed atmospheres
Type B seal
capable of withstanding an overpressure of 35kPa
If the level of naturally occurring flammable gas at the mine is insufficient to reach the LEL under any circumstances (s325)

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15
Q

SEALS (provide a high resistance barrier between the general body workings and sealed atmospheres What is a Type C seal used for? And what overpressure can they withstand?

A

Type C seal
Capable of withstanding an overpressure of 140kpa
FB200 is used in the construction
Used if intake air travels across the face of a permanent seal (s346)
The seal has the following:
Leakage to the seal is minimised & damage to the seal prevented.
Seal is a minimum Type C.
Monitoring device installed in each intake airway on the return side of the seal to detect GB:
O2
CO2 if behind the seal in concentration greater than 3%.
Any other gases behind the seal likely to create a risk if it enters the adjacent intake roadway.

The monitor above must:
For a longwall, positioned at the intersection of the face & intake airway.
Triggers an alarm to warn persons who may be affected.

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16
Q

SEALS (provide a high resistance barrier between the general body workings and sealed atmospheres What is a Type D seal used for? And what overpressure can they withstand?

A

Type D seal. capable of withstanding an overpressure of 345kPa
Used if persons remain UG and an explosive atmosphere exists and there is a possibility of spon com, incendive spark or other ignition source.
3 rings of PUR are injected around the opening.
40Mpa concrete is used in the construction
500mm for every 10m of water head pressure
Keyed into the roof floor and ribs

17
Q

List some of the installation details that seals are installed / comply with? List 5

A

Water trap installed at height 0.25m ? 0.5m
All seals have a 150mm Victaulic service pipe capped (allows Inertisation to be applied)
Gas sample lines/pipes at respective heights (6 lines installed in total, 3 on each side)
#1 0.3m ? 0.6m from roof
#2 0.8m ? 1.3m from floor
#3 0.3m ? 0.6m from floor thickness of seals depends on the surface area of the roadway and if they have a water head rating (Have depth gauges for thickness)
Seals are sprayed with 150mm front and back walls, then filled
Seal to be installed on clean solid rock floor
Located a minimum of 8m into the cut through (allow machine turning access and room if another seal needs to be constructed)

18
Q

List the requirements of an escapeway? 6 required

A

Escapeways
At least 2 trafficable (escapeways) from the surface (s296)
Primary escapeways(s298) (At least 1 escapeway mentioned in-s296)
Intake airway or combination of intake airways
Designated as primary escapeway
Separated as far as practicable from all other roadways by a separation stopping.
Free from risk of fire
Fire fighting equipment located on or near any installed equipment on it.
Trafficable by mechanised equipment (unless being driven as single entry or 2 heading development)

19
Q

List the mining equipment and sequence of populating a development?

A 
MINING EQUIPMENT AND SEQUENCE
Development:
Conventional or board and pillar/place change
Miner
Shuttle car
Boot end
Auxiliary Fans
Cable mats
Water reelers
Cable boats
Vent tubes
Bolters
20
Q

List equipment in a crib room?

A

Crib room (T1 location)
Signage: (both sides of c/t)
First aid, telephone, Emergency Response Location, cribroom, DRSABCD
Communication, phone/DAC, current phone list (non-verbal)(Is phone working)
First aid & Trauma kit, entonox, 20l distilled water, stretcher
PPE, Esky, Rubbish bin?s
Crib table
Housekeeping,
Self contained breathing apparatus (Oxy K, CABA)
Brattice sail
Ballasted/ dry/ rib meshed

21
Q

List documentation in a crib room?

A 
Panel documentation
Report book:
Incident/accident
Statutory inspection
Tell tale record 
Production 
Electrical and mechanical 
Frictional ignition
Permit to mine, ATM
Current mine plan, Emergency evacuation plan
Panel hazard plan (Geotechnical)
Mine Managers support plans
RA of panel first workings
Frictional ignition Procedures
No go zones
Extension of drive sights
SHMS (PHMPs, TARPs, SOPs, PSWPs, SWPs STDs)
BIN (goaf wells or gas drainage)
ChemAlert
Sequence plan
S & H notices
22
Q

List advantages and disadvantages with BI DI and UNI DI?

A 
BI-DI:
\+ Good for short seams
\+ Faster
\+ Creep easily managed
- Dusty
- More technical for operators
UNI-DI:
\+ Operator free from dust
\+ Good for high seams
\+ Less training
\+ Horizon is easily maintained
- Takes longer
- Can cause creep
23
Q

List the mining equipment and sequence of populating a longwall?

A 
Longwall:
Shields
Maingate/Tailgate
Shearer
BSL (crusher/boot end)
Pump station
Monorail
Cutting method:
24
Q

What is an ERZ0?

A

ERZO(S287)

Part of the mine has GB concentration of CH4 >2%, identified by risk assessment.

25
Q

List 8 places that is an ERZ1 as per the Regs?

A

ERZ1(S288)
Part of the mine has GB concentration of CH4 range from 0.5% - 2%, identified by risk assessment.
Also following places:
1. Coal or other material being mined (other than brushing in an outbye location)
2. Ventilation doesn?t meet the requirements of s343 or344
3. Connections or repairs to a CH4 pipeline.
4. Holes being drilled UG in the coal seam or adjacent strata for exploration or seam drainage.
5. Inbye the panels last completed C/T (not longwall)
6. Goaf area (if below 2% CH4)
7. Return side of all of the above (unless ERZ0)
8. Single entry drives with exhaust ventilation inbye the last ventilation duct.

26
Q

What is a NERZ? List 2

A

NERZ (S287)
Part of the mine has GB concentration of CH4 <0.5%, identified by risk assessment.
Submerged by water
NERZ may be divided into sub-zones to enable differences between tripping electricity supply when GB CH4 is detected, each sub-zone is a NERZ

27
Q

list 3 types of gas monitoring and the advantages and disadvantages

A 
Gas Chromatagraph
\+used for locations outside fixed points
- human error and samples have to be physically delivered
1. Tube bundle:
\+ Instrument does not need to be IS
\+ Independent of UG power
- Time delay for results
- Leaks are not immediately apparent
- Don?t have a trip function
2. Trolex (telemetric):
\+ Results are available in real time
\+ Sensor failure is recognised immediately
- High level of maintenance
- Not suitable for low O2
- Have a trip function
28
Q

A gas monitoring system must? list 6 items.

A

Gas monitoring system must:
Continually monitor mine atmosphere to detect O2, CH4, CO & CO2.
Automatically detect or calculate values & trends of:
Gas concentrations
Ratio of CO2 & O2 deficiency (graham?s ratio)
Ratio of CO & CO2.
Gas explosibility
Automatically activating an alarm.
Record values & trends (recorded at the surface and easily accessible by persons)
Alternate electricity supply for failure of normal electricity.

29
Q

The SHMS must provide for continuous monitoring at:?list 5 places

A

S223
The SHMS must provide for continuous monitoring at:
Return airway of each ventilation split.
Return airway from each unsealed waste, idle workings & goaf area.
Return of each airway at upcast shaft
Other places stated in the mines PHMP for gas monitoring
Return side of each conveyor belt
Automatically activate an alarm at the surface that is under observation by a person.
There must be a regular updated plan of each sampling point and each VCD (regulator)
No person shall relocate sampling equipment without the VO authorisation

ERZ Studies. (29 decks)

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