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MINE4710 Mine Management > Wk4 - NSW Mine Safety Law > Flashcards

Wk4 - NSW Mine Safety Law Flashcards

1
Q

What is WRAC

A

Workplace Risk Assessment and Control

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2
Q

What type of assessment is open risk

A

semi-quantitative

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3
Q

What are the stress enviroments and joint types in open cut pits, why does blasting effect this?

A

these are heavy low stress environments where there is a clamping effect holding the joints and after a blast this effect of holding can lead to a reduced strength

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4
Q

What is the key differences in underground management operations in an UG to OC.

A

When looking at roof falls UG cannot afford roof falls as underground there will be injuries and fatalitites. In OC failures of the rock wall are not as detremental as exclusion zones can be set up.

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5
Q

Why is proactive management needed

A

the is risk of a lot of failure and the failures need to be managed from the beginning

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6
Q

Do faults change fast

A

faults can be discovered and change rapidly

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7
Q

How advanced are the methods of convergence monitoring

A

it can be very primative methods all the way to advanced

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8
Q

Why are qualitiative scales are given

A

the values lead to an unbaised result

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9
Q

What is used to show the risk in a situation instead of FOS

A

Probability of failure is used as it gives a compariable quantity for situations

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10
Q

How can OpenRisk software assesment be done more efficently.

A

risk rating can occur faster when the performance is determined and there is a list of controls provided to the mine where uses can allows comparison of stats across days or shifts compared to history. It can also show accross a company what mines are higher risk than others.

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11
Q

Why does manufacturing have better understanding/certainty

A

All materials are man made so there is more confidence in their product and its properties

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12
Q

What is Stochastic modelling based off

A

Monte Carlo Simulation

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13
Q

How is PoF calculated using modelling

A

Stochastic Modelling

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14
Q

How is PoF calculated using formula

A

It is highly complex wher a mechanistic formula is used in comparison to models that have failed to run a model that will result in a distribution of the FOS for each of the model that will give a log normal distribution for pillars.

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15
Q

What is the issue with using one produced distribution

A

It will result in bias

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16
Q

What is diffusion of coefficent

A

the rate of release of gas from coal particles

17
Q

What is the exposure of the product

A

is the consequence of the risk

18
Q

What is the function of EasyFit software

A

goodness of fit tests

19
Q

What is the function of RiskAMP

A

stochastic modeling/ monte carlo simulation

20
Q

What are characteristics of open cut coal mines

A

*fast moving faces
*shallow
*long straight benches
*short life of slopes
*things happen quickly

21
Q

Does an OC mine suit a detailed analysis after blasting

A

no

22
Q

What should the ground control principles in open cut mines

A

*appropriat designs
*proactive management
*continuous improvement
*no-surprise failure
*learn from all failures

23
Q

Why use OpenRisk software

A

*enable operation to make quality decision
*pro-active management
*avoid surprises
*lean from failures

24
Q

Why was OpenRisk developed

A

as part of the risk based operational practices when south africa required law to draw up codes of practice (CoP) as a risk based approach to open cut slope stability.

25
Q

What are advantages of OpenRisk

A

*unbaised standard quantified assessment of risk
*likelihood of failure and stabiltiy
*consequences/severity of failure
*risk of change
*controls/responses are pre-dertermined by geotech engineers
*change of likelihood of failure whn controls are implemented
*user-friendly
*dont need extensive training
*used after blasting
*automated controls
*text output
*chart output
*used for both highwalls and lowwalls
*used for portal and boxcuts

26
Q

What are the principles of OpenRisk

A
  1. Semi-quanitative risk management system
  2. Input parmeters can easily be update or changed
  3. assume risk is a funtion of given conditions parameters
27
Q

What are the outputs of geotechnical and mining risk

A

*Likelihood of failure
*Severity
*Risk Category

28
Q

Why should uncertainties be accounted for in Mining

A

*rock is inherently variable
*deterministic approach
*stochastic modelling accounts for quantitative uncertainties.

29
Q

What does a goodness of fit test measure

A

the compativbility of a random sample with a theoretical probability distribution function

30
Q

What are the 3 GOF tests

A

*Kolomogorov-Smirnov
*Chi-squared
*Anderson-Darling

MINE4710 Mine Management (11 decks)

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