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Roof/Rib Fatalities (1994-1999)

Roof/Rib Fatalities (1994-1999). Roof/Rib Fatalities (1994-1999). CMS&H. Roof/Rib Fatalities. Roof/rib fatalities have increased in recent years Roof/rib fatalities represent almost 70% of all underground fatalities MSHA is focusing on roof/rib fatality prevention. Background Statistics.

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Roof/Rib Fatalities (1994-1999)

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  1. Roof/Rib Fatalities (1994-1999) Roof/Rib Fatalities (1994-1999) CMS&H

  2. Roof/Rib Fatalities • Roof/rib fatalities have increased in recent years • Roof/rib fatalities represent almost 70% of all underground fatalities • MSHA is focusing on roof/rib fatality prevention

  3. BackgroundStatistics

  4. Underground Coal Mine Fatalities Study Period Study period through September 6, 1999.

  5. Underground Fatality Mix Other Roof/Rib

  6. 4 7 2 8 7 13 20 Fatalities by Occupation

  7. Mine Size Rib Fall Roof Fall Employees

  8. Fatalities by Type of Mining 4 4 26 12 15

  9. 4 3 4 6 3 1 Roof/Rib Fatalities (‘94-’99) 14 12 7 8 2 By District

  10. Distance from Working Face Rib Fall Roof Fall Feet

  11. Citations Issued MULTIPLE

  12. ContributoryFactors

  13. Contributory Fatality Factors • New at mine • Intersection hazards • Inby support • Rib hazards • Boom holes/overcast openings • Traumatic asphyxiation

  14. Contributory Fatality Factors Occurrences Note: These factors are not mutually exclusive.

  15. Roof/Rib Fatalities (‘94-’99)Total Mining Experience Median = 16 yrs. Frequency

  16. Roof/Rib Fatalities (‘94-’99)Experience at Mine Frequency Median = 1 yr.

  17. New at Mine • Increased workforce relocation rate • Mature, experienced work force • Roof/rib control complex • Knowledge of roof does not transfer • Site-specific, roof/rib training deficit

  18. Victim 50% of Roof Fall Fatalities

  19. Intersections • One-half of roof fall fatalities in intersections • Intersections are typically 10-20% of developed area • 80% of these fatalities in wide intersections • Intersection roofs weaker due to lack of rib support

  20. Fatalities Inby Roof Support Inby Under

  21. Inby Fatalities - By Occupation 8 3 4 3

  22. Inby Fatalities • One-half of inby fatalities were bolters • Four fatalities were due to bolter not following plan (inby single boom ATRS) • Four fatalities were marking unsupported roof • Four CM operators inby support (all remote-control, extended cuts)

  23. Fatality Classification Outburst Rib Roof

  24. Rib Falls • Rib fall fatalities increasing • All rib fatalities mining heights greater than 7 ft. • Most rib falls depths greater than 1000 ft. • 80% of rib falls - roof had fallen or was mined • 75% of rib falls involved overhanging rock brow

  25. Overcast/Boom Holes • Several fatalities in overcast/boom holes • Most holes are shot and then re-supported • Miners often work under unsupported roof • ATRS can’t reach roof

  26. Traumatic Asphyxiation • Several causes of death were traumatic asphyxiation, compression asphyxiation, etc. • One victim’s last words were “Can’t breathe” • Moving rocks only an inch or so may mean life or death • Quicker means of relief needed

  27. Roof/Rib Fatality Targets • New, experienced miners • Intersections • Inby roof support • Rib hazards • Boom holes and overcast holes • Traumatic Asphyxiation

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