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Final Report - Fatality #3 through #31 - April 5, 2010

Accident Report: Fatality Reference

Fatality Overview

Performance Coal Company
Upper Big Branch Mine-South
Massey Energy Company 
Mine ID: 46-08436

Fatal Underground Mine Explosion
April 5, 2010

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Summary of Investigation

Mine Accident Scenario Video


  • Entire Set of Appendices (64.3 MB)
  • By Appendix
    • Appendix A - List of Deceased and Injured Miners
    • Appendix B - Map of the Mine
    • Appendix C - List of Massey's Corporate Structure and Employees
    • Appendix D - List of Personnel Who Exercised Their Fifth Amendment Rights
    • Appendix E - Mine Rescue Personnel and Teams Responding
    • Appendix F - UBB Boreholes
    • Appendix G - Accident Investigation Protocols
    • Appendix H - Post-Accident Mapping Team Map
    • Appendix I - PIL No. 110-V-8 Procedures for Copying Photographs
    • Appendix J - Mine Dust Results
    • Appendix K - Inspection History
    • Appendix L - Mine Map Showing Direction of Primary Forces and Mine Dust Sampling Areas
    • Appendix M - Seismic Events in Southern West Virginia
    • Appendix N - WVDEP Surface Blasting
    • Appendix O - Geochemistry of Natural Gas and Coalbed Methane
    • Appendix P - Reconstruction of Ventilation Map
    • Appendix Q - Petrographic Analyses
    • Appendix R - Water Supply System to the Longwall Shearer Dust Sprays
    • Appendix S - Sediment Analysis from Water Baskets and Spray Nozzels
    • Appendix T - Detailed Discussion of Elimination of Electrical Ignition Sources
    • Appendix U - Testing Results for All Equipment Tested at A&CC
      • Appendix U-1 - Executive Summary of Investigation of Remote Control Units
      • Appendix U-2 - Executive Summary of Investigation of Longwall Lighting System Components
      • Appendix U-3 - Executive Summary of Investigation of Electrohydraulic Shield Control Components
      • Appendix U-4 - Executive Summary of Investigation of Longwall Communication System Components
      • Appendix U-5 - Executive Summary of Investigation of Portable Methane and Multi-gas Detectors
      • Appendix U-6 - Executive Summary of the Investigation of Power Supply, Amplifier Battery, Tracking Tag, and Tag Reader Components Associated with Pyott-Boone Tracking Boss Tracker System and Minecom UHF Leaky Feeder System
      • Appendix U-7 - Executive Summary of Investigation of Koehler-Bright Star Model 5100 and 5200 Series Cap Lamps and Cap Lamp Components
      • Appendix U-8 - Executive Summary of the Investigation of Seven Power Air Purifying Respiratory (PAPR) Helmet Battery Assemblies and Pieces
      • Appendix U-9 - Executive Summary of Investigation of Low-Energy Non-Permissible Electrical Items (Watches and Calculators)
      • Appendix U-10 - Executive Summary of Investigation of Machine-Mounted Methane Monitors
      • Appendix U-11 - Executive Summary of Investigation of High-Energy Non-Permissible Electrical Items
      • Appendix U-12 - Executive Summary of Investigation of a Nelson-Kellerman Anemometer
      • Appendix U-13 - Executive Summary of Investigation of Portable Radios
      • Appendix U-14 - Executive Summary of Investigation of Pyott-Boone CO Monitors
      • Appendix U-15 - Executive Summary of Investigation of Programmable Logic Controller Components
    • Appendix V - Vaisala National Lightning Detection Report 258028
    • Appendix W - Mine Electrical System
    • Appendix X - Examination of Components of JOY Mining Machinery JNA Control System
    • Appendix Y - Executive Summary of Investigation of a Digital Video Recorder (DVR)
    • Appendix Z - Mine Map Showing Extent of Flame, Incombustible Content and Coke
    • Appendix AA - Results of Proximate Analysis Testing
    • Appendix AB - Rock Dust Crew Notebook
    • Appendix AC - Belt Examination Book (4/1/2010) - 4/5/2010)
    • Appendix AD - Belt Examination Book (3/16/2010 - 4/1/2010)
    • Appendix AE - Additional Information on UBB MMU's
    • Appendix AF - Methane and Dust Control - Safety Precautions from Ventilation Plan
    • Appendix AG - Specifications of Water Sprays
    • Appendix AH - Roof Control Plan - Headgate and Tailgate Support
    • Appendix AI - Stability Analysis of Gateroad Design
    • Appendix AJ - Operation of the Minecom UHF Leaky Feeder System, Pyott-Boone Tracking, and Pyott-Boone Carbon Monoxide Monitoring System
    • Appendix AK - Mine Emergency Evacuation
    • and Firefighting Plan
      • Appendix AL - Summary of Examination of Three Refuge Alternatives
      • Appendix AM - Examination and Testing of Self-Contained Selt-Rescuers (SCSRs)
      • Appendix AN - List of Personnel Assisting in the Investigation


• Review of MSHA's Actions at the Upper Big Branch Mine-South