Top Coal Caving

Top coal caving

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

Chief Executive Officer

GPO Box 358 [email protected]

Brisbane Qld 4001 M +61 409 008 942

www.consultmine.com.auABN: 65155280292

Tuesday 23rd October 2012: 11.45am

Conference Presentation

ABN: 65155280292

Curriculum Vitae

Masters in Mining Engineering at UNSW

Masters in Geomechanics at UNSW

Graduate Diploma in Ventilation

Statutory Ventilation Officer’s Ticket

Reading at Dundee University in Scotland for the Conjoint Masters in Business

Administration and Masters in Law, specializing in Australian Resource Law and

Policy.

Clubs and Affiliations

Associate Member of the Mine Managers Association of Australia

Member of the Australasian Institute of Mining and Metallurgy (formerly

Chairperson of the Central West NSW & Canberra Branch)

Member of Australian Mensa, formerly an officer for 3 years

Member of Australian Coal Preparation Society

Member of Engineers Australia

Member of Australian Geomechanics Society

Member of the Australian Mining Petroleum Law Association

Red Cross Volunteer

Member of Mines Rescue at Northparkes

First Aid Officer

Conspectus of Employment

Chief Executive Officer of ConsultMine

Technical Services Manager at Xstrata Coal Queensland, Oaky

North Colliery

Technical Services Superintendent and Ventilation Officer at

Centennial Coal (Banpu Public Company)

Mine Geotechnician at Northparkes Mines, (Rio Tinto)

11 years with various mining contractors

ABN: 65155280292

About ConsultMine:

We are group of mining professionals who concatenate our talents and abilities for

special projects. We are the trouble shooters bringing intelligence and education to

mining problems. We provide solutions employing cutting edge technology, the best

mining engineering practice and exemplary safety standards.


Chief Executive Officer

GPO Box 358 [email protected]

Brisbane Qld 4001 M +61 409 008 942

ABN: 65155280292

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

Presentation Summary

Methodology

Myth

Theory

Mining planning

Ventilation

Development panels

Roadways

The equipment

The skills

Training

“How does it all work?”

ABN: 65155280292Background

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 makehttp://www.itascacg.com/mining/expertise.html

ABN: 65155280292

Thick seam Mining in the western US – Geological Considerations, by DL Boreck, undatedhttp://ars.els-cdn.com/content/image/1-s2.0-S1674526411000664-gr1.jpg

Methodology

Same suite of machinery

Extracts higher than normal LW

Upper part of the seam is caved

ABN: 65155280292

Methodology

85-90% recovery

6.4Bt estimated

Australian reserves

suitable for LTCC

(UNSW/CSIRO)

Stimulation

Caving by gravity

LW at foot of seam

Two AFCs

Suits high fluidity

coal with good

fragmentationGolsby after Hebblewhite Et Al

http://www.sciencedirect.com/science/article/pii/S136516090900063X

ABN: 65155280292

Myth

http://www.cczmm.com/Technology/ShowArticle.asp?ArticleID=9

Use conventional longwall equipment

Full extraction

Low dilution

Theory ABN: 65155280292

http://www.womp-int.com/story/2007vol5/story025.htm

Benefits

Recovery

Lower face extraction

height

Increased face stability

Easier development

Reduced risk of goaf spon

com

Higher resource recovery

compared to cost of

development

Less wall moves

Theory ABN: 65155280292

Mining Methods M Venkat 2008

Risks

Spontaneous Combustion

Dilution

Conditioning – hydro fracing

or blasting

Gas make

Fire risk

Subsidence

Dust

Convergence of gate roads

Parts availability

TheoryABN: 65155280292

Arch under different angles of repose http://www.sciencedirect.com/science/article/pii/S136516090900063X

Geotechnical risk

Waste angle of repose

Top coal max radius

Top coal caving angles

Yield angles

Wall friction energy

Wall stress

Equipment selection

ABN: 65155280292

Case study

Rear AFC and back of roof supports http://http://www.austarcoalmine.com.au/AboutUs/LongwallTopCoalCaving/tabid/110/Default.aspx

Case study - Austar

Soutirage

ABN: 65155280292

How does top coal caving work?

Rear AFC and back of roof supports http://www.mirmgate.com/index.php?gate=appgate&pageId=document&docId=2&docItem=46&printmode=1

Case study – Austar Acknowledge the

assistance of:

Austar website

Ellton Longwall website

China National Coal

Mining equipment

website

China Overseas

Development co website

Kurt Ekanayake – Austar

commissioning and now

Principle Mining

Engineer AMC

ABN: 65155280292

Plan

Capital

Seam thickness

Coal recovery

Same roof and floor

conditions as normal LW

Gassy – non simultaneous

multislice

Sealing and spon com

Ventilation

Mine planning and panel layout

ABN: 65155280292

- Maintenance

- Operations

Gas

Spon com

Dust

Heat

Good ventilation is important

Ventialtion across shearere drum, ACARP C14036TingX Ren, Rao Balusu, B Plush, M Burgess, http://www.resources.nsw.gov.au/__data/assets/pdf_file/0007/368746/Barry-McKay-Welding.pdfAPP Gate: Asia Pacific Partners, http:/www.mirmgate.com/index.php?gate=appgate&pageId=document &docId=2&doc…

Ventilation

ABN: 65155280292

- Predictive tools

Fragmentation

Waste slope angle

Flow analysis

Coal arch behaviour

Coal breakage angle

Particle size

Hard to model

Longwall Mining Venkat, undated, A) TCC with vibration B) TCC without vibration http://www.sciencedirect.com/science/article/pii/S136516090900063X

Mine planning



ABN: 65155280292

Larger

roadways

Consider

support needs

Entries for

vent

Services

Self advancing hydraulic supports to keep roadways open http://www.mirmgate.com/index.php?gate=appgate&pageId=document&docId=2&docItem=47

Development

ABN: 65155280292

Specialist

support

Sliding roof

bar supports

Keep

roadways

open longer

Self advancing hydraulic supports to keep roadways open http://www.mirmgate.com/index.php?gate=appgate&pageId=document&docId=2&docItem=47

Roadways

ABN: 65155280292

- Conventional

Longwall

Powered face supports

Shearer

Armoured Face

Conveyor

Conveyor System

Electricals and

communication

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

The equipment

- LTCC

Same equipment modified to suit

ABN: 65155280292

Maingate support to the rear BSL –

Case study Austar


The equipment

ABN: 65155280292

Commissioning

Caving – Case study Austar


The equipment

ABN: 65155280292

Moving forward -

Case study Austar

Recovery sequence

Roof support

Anticipated increased

stress and floor heave


Is new technology available?

ABN: 65155280292

Moving forward - Case study Austar Increased roadway size

Increased valve functions to supports

Maintenance engineering

Ventilation – gas/heat

Automation


Is new technology available?

ABN: 65155280292

New Technology Vibration

Automation

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

ABN: 65155280292

Skills?

http://www.undergroundcoal.com.au/longwall/facesupports.aspx

Base skills

same as LW

Equipment

operation

Caving

behaviour

Strata

behaviour

Gas and dust

ABN: 65155280292

Training?

http://www.undergroundcoal.com.au/longwall/facesupports.aspx

Change management

Engineering experience

Bench marking

Operational training

Change in equipment

More manual use of the LW

Development cutting and set

up needs

Gas and dust management

Engineering knowledge

ABN: 65155280292

How does it all work?

Systems

Experience

Training

Management

Analysis

Change

management

Culture

Continuous

improvementGeological and Geotechnical Influences on thre Caveability and Drawability of Top Coal in Longwalls, P Humphries B Poulson 2008

Top coal caving


Chief Executive OfficerGPO Box 358 [email protected]

Brisbane Qld 4001 M +61 409 008 942

www.consultmine.com.auABN: 65155280292

Tuesday 23rd October 2012: 11.45am

Conference Presentation

Thank you.Any Questions?