top coal caving presentationv5 - consultmine coal caving presentation.pdf · top coal caving...

Top coal caving

Allison Golsby

Tuesday 23rd October

Conference Presentation

Allison Golsby MAusIMM(CP), RPEQ, MEngSc(Min Man), MMinEng(Geomech

Chief Executive Officer

GPO Box 358

Brisbane Qld 4001

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Top coal caving

Tuesday 23rd October 2012: 11.45am


MAusIMM(CP), RPEQ, MEngSc(Min Man), MMinEng(Geomech), GDipMVent

Chief Executive Officer

[email protected]

M +61 409 008 942

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Presentation Summary

� Methodology

� Myth

� Theory

� Mining planning

� Ventilation

� Development panels

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http://mining.delgos.org/?p=80

� Roadways

� The equipment

� The skills

� Training

� “How does it all work?”

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http://mining.delgos.org/?p=80

��Background

Thick seam mining

�More than 4.8m

�Strata control

�Premature pillar failure

�Spontaneous combustion

�Heavier supports required

�Subsidence

��Higher capital

�Easier to plan

�More dilution

�Higher extraction ratio

�Higher gas make��

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Methodology

� Same suite of machinery� Same suite of machinery

� Extracts higher than normal LW

� Upper part of the seam is caved

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Extracts higher than normal LW

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Methodology

� 85-90% recovery� 85-90% recovery

� 6.4Bt estimated

Australian reserves

suitable for LTCC

(UNSW/CSIRO)

� Stimulation

� Caving by gravity� Caving by gravity

� LW at foot of seam

� Two AFCs

� Suits high fluidity

coal with good

fragmentation�� %

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Myth

� Use conventional longwall equipment � Use conventional longwall equipment

� Full extraction

� Low dilution

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Use conventional longwall equipment Use conventional longwall equipment

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Theory ��

Benefits

� Recovery� Recovery

� Lower face extraction

height

� Increased face stability

� Easier development

� Reduced risk of goaf spon

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� Reduced risk of goaf spon

com

� Higher resource recovery

compared to cost of

development

� Less wall moves

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Theory ��

Risks

� Spontaneous Combustion� Spontaneous Combustion

� Dilution

� Conditioning – hydro fracing

or blasting

� Gas make

� Fire risk

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� Fire risk

� Subsidence

� Dust

� Convergence of gate roads

� Parts availability

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Theory��

� Geotechnical risk

� Waste angle of repose

� Top coal max radius

� Top coal caving angles

� Yield angles

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� Wall friction energy

� Wall stress

� Equipment selection

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Case study

�� Case study - Austar

� Soutirage

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How does top coal caving work?

� Case study – Austar� Case study – Austar� Acknowledge the

assistance of:

� Austar website

� Ellton Longwall website

� China National Coal

Mining equipment

website

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website

� China Overseas

Development co website

� Kurt Ekanayake – Austar

commissioning and now

Principle Mining

Engineer AMC

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How does top coal caving work?

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Mine planning and panel layout

� Plan

� Capital

� Seam thickness

� Coal recovery

� Same roof and floor

conditions as normal LW

�� Gassy – non simultaneous

multislice

� Sealing and spon com

� Ventilation

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Mine planning and panel layout

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Ventilation

- Maintenance

- Operations

� Gas

� Spon com

� Dust

� Heat

� Good ventilation is important

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- Predictive tools

Mine planning

- Predictive tools

� Fragmentation

� Waste slope angle

� Flow analysis

� Coal arch behaviour

� Coal breakage angle� Coal breakage angle

� Particle size

� Hard to model

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�Larger

Development

�Larger

roadways

�Consider

support needs

�Entries for �Entries for

vent

�Services

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Roadways

�Specialist

support

�Sliding roof

bar supports

�Keep �Keep

roadways

open longer

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- Conventional

Longwall

The equipment

- LTCC

�Longwall

� Powered face supports

� Shearer

� Armoured Face

Conveyor

� Conveyor System

� Electricals and

http://www.rlv.si/en/files/default/ANG%20BROSURA%20VOM

� Same equipment modified to suit

� Electricals and

communication

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LTCC

http://www.rlv.si/en/files/default/ANG%20BROSURA%20VOM.pdf

Same equipment modified to suit

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The equipment

�Maingate support to the rear BSL

Case study Austar

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support to the rear BSL –

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�CommissioningThe equipment�Commissioning

�Caving – Case study Austar

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Austar

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Is new technology available

�Moving forward -

Case study Austar

� Recovery sequence� Recovery sequence

� Roof support

� Anticipated increased

stress and floor heave

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Is new technology available?

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�Moving forward - Case study Is new technology available�Moving forward - Case study � Increased roadway size

� Increased valve functions to supports

� Maintenance engineering

� Ventilation – gas/heat

� Automation

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Case study AustarIs new technology available?

Case study Austar

Increased valve functions to supports

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New Technology� Vibration � Vibration

� Automation

http://www.uow.edu.au/eng/longwall/images/equipment/

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http://www.uow.edu.au/eng/longwall/images/equipment/lwred.jpg

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Skills?Skills?

� Base skills

same as LW

� Equipment

operation

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operation

� Caving

behaviour

� Strata

behaviour

� Gas and dust

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Training?

� Change management

� Engineering experience

� Bench marking

� Operational training

� Change in equipment

� More manual use of the LW� More manual use of the LW

� Development cutting and set

up needs

� Gas and dust management

� Engineering knowledge

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How does it all work?

� Systems

� Experience

� Training

� Management

� Analysis

� Change � Change

management

� Culture

� Continuous

improvement

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Top coal caving

Allison Golsby



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Allison Golsby MAusIMM(CP), RPEQ, MEngSc(Min Man), MMinEng(Geomech), G

Chief Executive OfficerGPO Box 358

Brisbane Qld 4001

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Top coal caving



MAusIMM(CP), RPEQ, MEngSc(Min Man), MMinEng(Geomech), GDipMVent

Chief Executive [email protected]

M +61 409 008 942

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