underground coal mining presentation_dec 2011

Understanding of process and techniques

Company BHP Billiton Caroona Coal Project

Author Mick Barker

Date 5 December 2011

BHP Billiton has committed to:

no longwall mining underneath the floodplain;

no longwall mining underneath the alluvial irrigation aquifers;

no open cut mining anywhere within the EL; and

no mining of any description outside of the target area.

Longwall mining is a type of underground mining used for the

extraction of coal and the information in this presentation will

further explain this type of mining.

5 December 2011 2 Community Consultative Community Presentation Caroona Coal Project

Section 1 Underground coal mining Other terminology and methodology associated with underground mining

Overview of underground mining equipment

A comparison to open cut mining techniques

Section 2 Mine design and infrastructure Process to develop a mine design

Overview of infrastructure associated with underground mining


Underground coal mining


Contents Development mining Longwall mining Mining services

There are many types of underground mining which have evolved through the

development of technology improving safety, efficiency and level of impact on the

environment:

bord and pillar;

development;

drift longwall;

punch longwall.


1. Drift (rail) 2. Ventilation fan 3. Pit top 4. Offices 5. CHPP 6. Coal load out bins 7. Mine services 8. Longwall face 9. Coal seam 10.Development section 11.Coal pillar 12.Underground bin 13.Pit bottom 14.Shaft (elevator)



Cordeaux Colliery pit top - 10.75ha


Cordeaux Colliery pit top


Cordeaux Colliery

Dendrobium


Dendrobium

Mandalong

Specifically designed vehicles to transport men in and around the mine.



Continuous miner Designed to develop roadways for installation and operation of the longwall


Continuous miner At work in an underground environment.


Roof bolters Installing rock bolts in the roof.

Auxiliary fan Removes dust and gas from the working face.


Shuttle car The link between the continuous miner and the conveyor belt.


Load Haul Dump (LHD) Multiple purpose diesel machine used for material removal and lifting and carrying supplies around the mine.

LHD Heavy capacity lifting.

Grader Roadway maintenance.


Longwall shield and face


Shields Weight = 15-25

tonne Support 90 tonne of

roof pressure


Shearer cutting along coal face



Longwall shearer

Online Source http://undergroundcoal.com.au/fundamentals/07_advance-retreat_2ret.aspx


Double click middle of page to run graphic


Online source - http://undergroundcoal.com.au/fundamentals/07_caving.aspx Double click middle of page to run graphic

Pumping water management.

Compressed air energy source for tools/equipment.

Ventilation removes stale air.

High voltage electricity used to power plant.

Communication systems day to day and emergency.

Monitoring systems atmospheric levels.

Coal clearance movement of coal from underground to

surface.


Mine design and infrastructure


Contents Developing mine plans/design Other associated mine infrastructure

Resource factors

Deposit shape

Deposit type

Surface features/ constraints

Environmental impacts/constraints

Mine factors

Ventilation

Spontaneous combustion

Geological/ geotechnical factors

Subsidence management

Other factors

Development/ capital costs

Production costs

Resource recovery

Assessment and selection of layout options

Socio economic issues


Power lines

Telecommunications

Gas lines

Water supply facilities

Roads

Bridges

Natural surface features


Development of a number of options which are tested, refined

and optimised the essence of mine planning.

Outputs from successive iterations are examined and often form

the basis of developing a new suite of inputs for the next

iteration.

The iterative process is optimised through:

improved quality of input data;

modelling tools and capacity of model user;

experience in evaluating successive outputs;

reduce the options to a go forward case for implementation.


Structures have some of the largest impacts on mine layouts.

These include: faults;

dykes;

intrusions;

variable grades.

Other geological geotechnical factors affecting layout include: stress orientation;

strata strength;

lineament zones;

water make.


CH&PP (coal handling and preparation plants)

Stockpile areas and management

Rail load out facilities

Ship loading facilities



Mt Arthur Coal


Mt Arthur rail load out facility


Loading ships at Newcastle

The February 2012 presentation to the Community

Consultative Committee aims to address issues that have

been raised by stakeholders about subsidence such as:

what is subsidence?;

what causes subsidence?;

what are the potential impacts of subsidence on the natural and built environment?;

how are these impacts managed?;

regulatory controls;

case studies.


Questions


Slide Number 1IntroductionOutlineSection 1Underground (UG) coal miningUnderground mineUnderground mineUnderground mineUnderground mineUnderground mine Personnel transportDevelopment mining equipmentDevelopment mining equipmentDevelopment mining equipmentDevelopment mining equipmentDevelopment mining equipmentDevelopment equipmentLongwall layoutLongwall faceLongwall mining equipmentLongwall mining equipmentLongwall mining equipmentLongwall mining equipmentLongwall miningTop coal cavingMining servicesSection 2Mine plan factors consideredSurface facilitiesIterative processMine plan example layoutGeological/geotechnical Geological structure (Bowen Basin Symposium 2005)Completing the processCH&PPProcessing plant stockpileTrain load outShip loadingNext presentation subsidenceSummary

underground coal mining presentation_dec 2011

Documents

coal pillar

extraction of coal

coal seam

type of mining

type of underground

types of underground

underground environment

underground bin