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Dust Control In Hard Rock Mines


Many items discussed in this presentation requires problem solving at ... Also spray bars in close proximity can knock down goodly amounts of generated dust. ... – PowerPoint PPT presentation

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Title: Dust Control In Hard Rock Mines

Dust Control In Hard Rock Mines
  • What You Cant See Can Kill You.

Dust Control In This Mine Is A Large Complex
  • Many items discussed in this presentation
    requires problem solving at all levels of an
  • It may require engineering, operations, or
    maintenance groups to assist to ultimately solve.
  • It requires a total team effort from all
    underground personnel other site-wide groups.

Dust Control In Any Mine Is A Large Complex
  • Dust can cause health related issues whether it
    is a short acute related health problem or a long
    term systemic problem like silicosis.
  • Prevention of dust is everyones problem. We all
    breath the same air, if we dont take care of it.
    In other words It can kill you.

Why Can Dust Get So Bad Here?
  • Fact Major dust compliance problems in hard
    rock mines is caused by silica (quartz) in the
    rock. Mines high in silica content rock, 8 or
    more, are far more likely to have dust problems
    than those where there is less silica.
  • Fact On average the rock in this mine is 40
    silica content. Depending where you mine it can
    go higher.
  • Fact Exposure to silica dust can cause silicosis.

Major Source of Dust Generation
  • Blasting
  • Mucking Haulage
  • Drilling Bolting
  • Ore passes
  • Crushers
  • Conveyors Systems
  • Backfill Process
  • Road Headers
  • Shotcreting
  • Fresh Intake Mine Dust

Control Measures for Correction Reduction in
  • Water sprays Spray Bars
  • Ventilation
  • Control of drill dust
  • Control of conveyor dust
  • Control of ore pass dust
  • Control of mucking haulage dust
  • Control of blasting dust
  • Control of road-header dust
  • Control of fresh air intake dust

Control Measures
Drill Dust Control
  • Factors that can lead to high dust levels on
  • Lack of Proper Maintenance
  • Failure to use water
  • Inadequate quantities of water
  • Plugged water holes in drill steels
  • Dull drill bits
  • Dry collaring.
  • Poor Maintenance on dust collector systems
  • Good Dust Control
  • Requires Good Regular Consistent Maintenance

Crushers Rock Breakers
  • Water Sprays Systems
  • Dust Collector Systems
  • Ventilation Systems
  • All require regular maintenance attention.
  • Disabling dust control systems are a bad practice
    that can cause long term health threats.

Conveyor Belt Dust Control
Possible Solutions to Conveyor System Dust
Solutions to Conveyor Transfer Box Dust May
Require Installing Properly Maintaining Dust
Collector Systems Moving Rock Moves Air.
Maintenance of Water Spray Sprinkler Systems
Solving Ore Pass Dust
  • A critical step in dust control is to prevent
    its escape dispersal.
  • Confinement can be accomplished by systems of
    stoppings air tight doors, curtains, spray
    bars, or isolations of passes away from
  • Dust can be reduce by wetting before delivery
    adding water at the tipping site by spraying rock
    as it falls into passes.

Mucking Haulage Dust Control
  • Large Strides can be made to improve dust during
    this cycle.
  • Improvement to water trucks sprinklers.
  • Installation of mine wide sprinkler systems.
  • Dust surfactants testing implementations.
  • Wetting down entire muck area prior to removal of

Blasting Dust Control
  • Thoroughly wetting down area surrounding the
    blast (Back, Ribs Seal) before a blast will
    help settle dust from previous operations from
    becoming airborne.

Blasting Dust Control
  • Uniform rock moisture content of only 1 greatly
    reduces dust compared to dry rock both before
    after a blast.

Shotcreting Dust Control
  • Note Predampening washing down of rock
    surfaces in shotcreting zone will greatly improve
    adhesion of product eliminates a lot of dust
    that can be liberated during pneumatic
    application of product.
  • When dry systems are utilized predampening of
    product can reduce dust.
  • Also spray bars in close proximity can knock down
    goodly amounts of generated dust.

Road Header Dust Control
  • Dust Control for machines like roadheaders
    usually depend on some degree of dust cloud

Road Header Dust Control Managed Through
Ventilation Water Sprays
Fresh Air Intake Dust
  • Dust is liberated from other sources (i.e.
    process facilities, haul roads, backfill
  • Possible solutions
  • Surface application of dust surfactants around
    fresh air intakes.
  • Increased water trucks scheduling.
  • Better dust control at surface crusher facilities.

Respiratory Protection
  • Ultimately it is the objective of the safety
    department to do away with mandatory respiratory
    protection for all underground personnel. This
    will only be possible by diligent efforts of all
    personnel underground.
  • There are definitely in roads that need to be
    made. Some of it is behavioral. Some of it is
    improvement in conditions that create dust
    releases. It will require everyones help
    active participations to solve.

Lets Talk About Near Misses Accidents
  • We all know that accidents near misses are when
    conditions behaviors run close enough together
    to cause an incident the only way to control them
    is to separate conditions away from behaviors.
    The farther apart these are the greater margin of
  • You say, What does that have to do with dust

Conditions Can Drive Behaviors Behaviors Can
Drive Conditions
  • What conditions can drive behaviors?
  • How do we correct them?
  • What behaviors can drive conditions?
  • How do we correct them?
  • The Key to solving this problem is what?

  • You may not be able to control how your fellow
    worker will react.
  • The Key is being able to control how you react.
  • Proactive Safety can help solves problems.
  • Collectively if we all choose to do the most
    productive correct solution to this problem,
  • It wont belong to until we all have eaten this
  • It starts with the first bite.

In Summary
  • Dust is by product of the mining process.
  • It take daily commitment from all personnel
    underground to solve this problem every shift.
  • Remember controlling dust every day can keep the
    respirator 02 bottle away.
  • Please do your part every day.

Created by Pat GazewoodA.k.a. Capt. Shotcrete
  • Thanks to Niosh for source information used in
    this presentations.
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