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Respirable dust measured downwind during rock dust application.

M L Harris1, J Organiscak1, S Klima1

  • 1M.L. Harris, J. Organiscak, member SME, S. Klima, member SME, and I.E. Perera are lead general engineer, mining engineer, mining engineer and chemist, respectively, at the National Institute for Occupational Safety and Health (NIOSH), Pittsburgh, PA, USA.

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This study quantified respirable rock dust generation during mining operations. Results highlight the need for administrative controls when applying rock dust to minimize airborne dust exposure.

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Area of Science:

  • Occupational Health and Safety
  • Mining Engineering
  • Environmental Science

Background:

  • Respirable dust in mines poses significant health risks to workers.
  • Rock dusting is a common method for dust control in mining.
  • Effectiveness of different rock dust treatments and application methods requires evaluation.

Purpose of the Study:

  • To quantify respirable rock dust generation from treated and untreated rock dust.
  • To assess dust levels during different rock dusting application methods.
  • To inform best practices for minimizing dust exposure in mining environments.

Main Methods:

  • Underground evaluations using personal dust monitors.
  • Application of untreated and treated rock dust (with anticaking additive) on surfaces.
  • Testing with rock dust from which the respirable component was removed, applied via bantam duster.
  • Measurement of downwind respirable dust levels.

Main Results:

  • Quantified respirable rock dust generation during flinger-type application on rib and roof surfaces.
  • Measured dust levels from rock dust with reduced respirable components.
  • Data presented and discussed for downwind dust measurements.

Conclusions:

  • Rock dusting practices require continuous administrative controls to minimize dust.
  • Effective dust control strategies are essential for miner health.
  • Further research may be needed to fully assess miner exposure under acceptable mining practices.