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Dust in Underground Hard Rock Mines

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Benjamin Hales

on 30 October 2013

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Transcript of Dust in Underground Hard Rock Mines

Dust in Underground Hard Rock mines
Presenters:
Benjamin Hales 3873432
Alex Tuckey

4076813
Kris Gorman 4064124
Junaid Safdar 3973839
Introduction
Dust can cause many problems, so monitoring and record keeping are fundamentals in the mining industry.
Most of the information presented comes from NSW legislation.
All information presented is from our research and is not the extent to which dust may be controlled.

Legislation
Inhalable dust limit 10 mg/m3
Respirable dust limit 2.5 mg/m3
Silica dust limit 0.12 mg/m3
Managing Dust
Dilution ventilation
Displacement ventilation
Water spray
Airbourne capture
Dust scrubbing
Isolating personnel
Monitoring
Monitoring dust levels in underground environments can ensure that all requirements are met and that the working environment is kept safe.
Measure dust levels that worker experiences
Worn by people working in critical areas
Personal Sampling
Works similar to personal sampling
Can be placed in a fixed location and on equipment
Gravimetric Sampling
Instantaneous dust levels
Calibrated to measure dust particle sizes
Photometric Sampling
Measures dust at set intervals
See concentration changes over time
personalDataRam
Develop a dust management and mitigation plan for an underground hard rock mine to satisfy relevant legislation and guidelines. Describe briefly your environmental monitoring system to ensure compliance with license conditions.
Sources and Mitigation planning
Ore Pass
Drilling
Blasting
Transport (ore)
Transfer points
Crushers
Load-Haul-Dump
Roadheaders
Summary
Many sources of dust in mining.
There are also many ways of managing these problems that mining engineers can use.
Can cause problems for workers and employers as compo payout are not cheap.
Bottom line; manage dust and the law will not be after your head.
Underground blast at McArthur River Mine
Reference List
Chief Inspector.2007. Notice – Airborne Dust Limits, Collection and Analysis.
Howes, M.J. 2011. Ventilation and Cooling in Underground Mines.
Centre for Disease Control. 2013. Handbook for Dust Control in Mining.
Spraying Systems Co. 2008. A Guide to Spray Technology for Dust Control.
Best Practice Environmental Management in Mining, Environment Australia, 1998.
Reference List
The Hazardous Nature of Dusts Chapter 19, Malcolm J McPherson, c. 2006.
Best Practices for Dust Control in Metal/Nonmetal Underground Mining, Greg Chekan.
Dust Suppression Solution -­‐ Dust Control System -­‐ Dust Solutions. 2013.
Conveyor Specialties, Inc.. 2013. Dust Control Systems.
Ore Pass
Gravity fed ore pass, colliding generates dust.
Management
Dampening rock
Auxiliary fan
Drills
Spinning and cutting action.
Management
Down-the-hole (air hammer drilling)
Wet drilling
Blasting
Shockwave and movement of rock.
Management
Wet blasting zone
Blast between shifts or during downtime
Monitor return dust levels
Ore transport
Dumping ore on to conveyor belt and vibration from conveyor belt and of pneumatic tyred equipment in transport drifts.
Management
Water sprays
Conveyor belts rather than mining trucks
Transfer points
Moving of bulk material between conveyances.
Management
Water sprays
Curtains
Crushers
This process liberates small particles and can violently distribute them in to the surrounding area.
Management
Use of water
Limit exposure to personnel
Load-Haul-Dump
Digging in to ore and the action created by pneumatic tyred vehicles on ground.
Management
Equipment selection
Use skilled operators
Roadheaders
Rotating head digging in to ore/rock.
Management
Water jets in cutting blades
Experienced personnel
Full transcript