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SLOPE & SHAFT SINKING TEAM

NOISE PROJECT. SLOPE & SHAFT SINKING TEAM . Shafts Conventional Drill, Blast, Muck or Clam-Shell Drill - Either Raise-Bore or Blind-Drill. Slopes Conventional Drill, Blast , Muck (Air or Diesel) Continuous Miner Cut. PROJECT TYPES.

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SLOPE & SHAFT SINKING TEAM

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  1. NOISE PROJECT SLOPE & SHAFT SINKING TEAM

  2. Shafts Conventional Drill, Blast, Muck or Clam-Shell Drill - Either Raise-Bore or Blind-Drill Slopes Conventional Drill, Blast , Muck (Air or Diesel) Continuous Miner Cut PROJECT TYPES Several different types of shaft/slope sinking methods employed:

  3. PROJECT CONSIDERATIONS • Determine where objective noise levels could be evaluated • Very few current projects available • Short duration of most projects • Logistics for team members • Use of specialized equipment • Initial visit and evaluation of projects • Recommend changes or improvements • Follow up on recommendations

  4. PROJECT SITE VISITS • Sampled noise levels at different jobs • Determined noise exposures • Evaluated noise sources • Determined if any noise controls were being utilized • Determined their effectiveness • Determined if hearing protection used

  5. PROBLEM AREAS • In Slopes/Shafts where air-powered equipment is used • During drilling, mucking, air-cleaning operations • On surface area near stationary equipment • In vicinity of hoists, compressors and ventilation fan • Ambient or background noise in the shafts/slopes

  6. RESULTS OF MINE VISITS • Air-Powered Equipment Drilling 111 dBA to 124 dBA Mucking 98 dBA to 110 dBA Air cleaning 100 dBA to 110 dBA • Surface Installations Hoists 99 dBA to 103 dBA Compressors 84 dBA to 98 dBA Fans 85 dBA to 93 dBA • Ambient Noise in Shafts/Slopes Range 87 dBA to 94 dBA

  7. Air-Powered Drills - BEFORE -Heavy Cumbersome Designs -No noise considerations -111dBA to 124dBA

  8. Air-Powered Drills - NOW - Jacketed Body - Light-weight materials - Improved Engineering Designs - Improved noise level ranges 111-118 dBA

  9. MUCKERS Poor muffler systems 98DbA TO 110DbA

  10. New Mucker/Loader Designs Diesel or Hydraulic Muckers Backhoemodified 101 dBA Alternate Loading Methods Clam-Shell 83 dBA

  11. Drilling - Recommendations • Always use mufflers to reduce internal hammer noise • Use smallest diameter drill steel needed • Collar holes before applying full air pressure • Regulate air pressure to manufacturer specifications

  12. Mucking - Recommendations • Use equipment mufflers as provided by manufacturer • Reduce operating air pressure • Monitor and regulate air pressure • Keep equipment properly serviced and well lubricated • Explore alternative powered muckers (diesel, hydraulic) or methods of loading (Clam-shell)

  13. Surface Installation -Recommendations • Use prudent site planning to locate equipment away from work areas and entrances to slopes/shafts • Provide sound deadening enclosures • Provide noise barriers • Equip fans with inlet and exhaust silencers

  14. Ambient Noise -Recommendations • Use prudent site planning to locate equipment away from openings • Use flexible connections to stop fan noise transmission • Use insulating hangers or anchors to install fan tubing • Explore different types of fan tubing, sound deadening tubing/fan blades

  15. Hoist Installations - Before Noise levels ranged from 99 dBA to 103 dBA

  16. New Hoist Installations Sound deadening in operators cab. Hoist noise < 70.3 dBA

  17. Fan Installations - Improved New Fan Designs Silencers and Isolation surround 83 - 85 dBA

  18. Compressor Installations Before: 93- 98 dBA After: 92-95 dBA Effective Isolation Barriers

  19. Improved Compressor Design Manufacturer’s applied noise reduction technology 83 dBA

  20. Future Plans • Continue to monitor shaft/slope sinking projects (both conventional and drilling types) • Measure effectiveness of new site layout plans • Pursue and encourage new equipment developments • Share findings/results with industry

  21. Future Plans • Visited shaft sinking site using backhoe adapted mucker design (Feb 7-8) • Test an improved low dBa air-powered drill (March 13-14) • Visit slope sinking project using diesel scoops for mucking operation (projected March) • Survey and Review Metal/Non Metal Shaft/Slope sinking sites for different methods/technologies (projected Feb-March)

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