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Top Coal Caving
Top Coal Caving
Top Coal Caving
Top Coal Caving
Top Coal Caving
Top Coal Caving
Top Coal Caving
Top Coal Caving
Top Coal Caving
Top Coal Caving
Top Coal Caving
Top Coal Caving
Top Coal Caving
Top Coal Caving
Top Coal Caving
Top Coal Caving
Top Coal Caving
Top Coal Caving
Top Coal Caving
Top Coal Caving
Top Coal Caving
Top Coal Caving
Top Coal Caving
Top Coal Caving
Top Coal Caving
Top Coal Caving
Top Coal Caving
Top Coal Caving
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Top Coal Caving

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Allison Golsby, Chief Executive Officer, from ConsultMine delivered this presentation at 2012 Longwall conference in the Hunter Valley Australia. Building on eleven years of excellence it’s rare that …

Allison Golsby, Chief Executive Officer, from ConsultMine delivered this presentation at 2012 Longwall conference in the Hunter Valley Australia. Building on eleven years of excellence it’s rare that such a large gathering of underground coal operators come together under the one roof, providing a great opportunity to catch up with friends, industry leaders, former colleagues and longwall mining specialists.
For more information, please visit: http://www.longwallconference.com.au

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  • 1. Top coal caving Allison Golsby MAusIMM(CP), RPEQ, MEngSc(Min Man), MMinEng(Geomech), GDipMVent Chief Executive Officer GPO Box 358 allison@golsby.org Brisbane Qld 4001 M +61 409 008 942 www.consultmine.com.au ABN: 65155280292 Tuesday 23rd October 2012: 11.45am Conference Presentation
  • 2. 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
  • 3. 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. Allison Golsby MAusIMM(CP), RPEQ, MEngSc(Min Man), MMinEng(Geomech), GDipMVent Chief Executive Officer GPO Box 358 allison@golsby.org Brisbane Qld 4001 M +61 409 008 942
  • 4. 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?”
  • 5. 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 make http://www.itascacg.com/mining/expertise.html
  • 6. ABN: 65155280292 Thick seam Mining in the western US – Geological Considerations, by DL Boreck, undated http://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
  • 7. 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 fragmentation Golsby after Hebblewhite Et Al http://www.sciencedirect.com/science/article/pii/S136516090900063X
  • 8. ABN: 65155280292 Myth http://www.cczmm.com/Technology/ShowArticle.asp?ArticleID=9  Use conventional longwall equipment  Full extraction  Low dilution
  • 9. 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
  • 10. 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
  • 11. Theory ABN: 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
  • 12. 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
  • 13. 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
  • 14. 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
  • 15. 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
  • 16. 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
  • 17. 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
  • 18. 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
  • 19. 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
  • 20. ABN: 65155280292 Maingate support to the rear BSL – Case study Austar http://www.womp-int.com/story/2007vol5/story025.htm The equipment
  • 21. ABN: 65155280292 Commissioning Caving – Case study Austar http://www.womp-int.com/story/2007vol5/story025.htm The equipment
  • 22. ABN: 65155280292 Moving forward - Case study Austar  Recovery sequence  Roof support  Anticipated increased stress and floor heave http://www.womp-int.com/story/2007vol5/story025.htm Is new technology available?
  • 23. ABN: 65155280292 Moving forward - Case study Austar  Increased roadway size  Increased valve functions to supports  Maintenance engineering  Ventilation – gas/heat  Automation http://www.womp-int.com/story/2007vol5/story025.htm Is new technology available?
  • 24. ABN: 65155280292 New Technology  Vibration  Automation http://www.uow.edu.au/eng/longwall/images/equipment/lwred.jpg
  • 25. 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
  • 26. 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
  • 27. ABN: 65155280292 How does it all work?  Systems  Experience  Training  Management  Analysis  Change management  Culture  Continuous improvement Geological and Geotechnical Influences on thre Caveability and Drawability of Top Coal in Longwalls, P Humphries B Poulson 2008
  • 28. Top coal caving Allison Golsby MAusIMM(CP), RPEQ, MEngSc(Min Man), MMinEng(Geomech), GDipMVent Chief Executive Officer GPO Box 358 allison@golsby.org Brisbane Qld 4001 M +61 409 008 942 www.consultmine.com.au ABN: 65155280292 Tuesday 23rd October 2012: 11.45am Conference Presentation Thank you. Any Questions?

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