Underground

Fatality #33 for Coal Mining 2010

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On Thursday, April 22, 2010, a 28-year old continuous mining machine operator with 5 years of experience was fatally injured when he was crushed between the conveyor boom of the continuous mining machine and the coal rib. The victim was located near the continuous mining machine while positioning it. The mining height in this area was approximately five feet.

Best Practices

  • Ensure the continuous mining machine operator is positioned beyond the turning radius, and away from the conveyor boom turning radius before starting or moving the equipment.
  • Frequently review, retrain, and discuss avoiding the “RED ZONE” areas when operating or working near a remote controlled continuous mining machine.
  • Pursue new technology, such as proximity detection, to protect personnel from accidents of this type. See the proximity detection single source page on the MSHA web site.
  • Minimize the number of miners working or traveling near continuous mining machines and maintain effective communications between miners and equipment operators.
  • Train all productions crews and management in programs, policies, and procedures for operating remote controlled continuous mining machines.

Click here for: MSHA Investigation Report (pdf), Spanish Fatalgram (pdf)

Fatality #3 – #31 for Coal Mining 2010

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On Monday, April 5, 2010, 29 miners were fatally injured and 2 miners received serious injuries when an explosion occurred in a large underground coal mine. The victims were located in different areas of the mine, some on their way out of the mine and others were involved with mining activities.

Best Practices

The following best practices are generally applicable to underground mining. An investigation is ongoing at Upper Big Branch which will determine the root cause(s) of the explosion on April 5, 2010.

  • EFFECTIVE VENTILATION SYSTEM – Properly design, frequently examine, and properly maintain a ventilation system that is effective at all times for all areas of the mine. This is the first line of defense against an explosion. Maintain proper air quality in bleeders for examiners.
  • ADEQUATE ROCK DUST – Apply rock dust liberally, even in wet areas, in all faces and outby areas. Maintain the applications to prevent the propagation of coal dust explosions.
  • PROPER EXAMINATIONS and IMMEDIATE CORRECTIVE ACTIONS – Conduct proper pre-shift, on-shift, supplemental, and electrical examinations. Immediately eliminate hazards involving inadequate ventilation, insufficient rock dust, methane accumulations, and permissibility violations.
  • METHANE AND OXYGEN CHECKS – Make frequent methane and oxygen measurements, especially during periods of rapid decline in barometric pressure.
  • COMBUSTIBLE MATERIAL – Clean up loose coal, coal dust, and other combustible material. The possibility of an explosion or fire can be diminished by reducing the fuel supply.
  • WATER SPRAYS and DUST COLLECTORS – Water sprays and dust collectors reduce the fuel available for a potential fire or explosion.
  • ESCAPEWAYS – Conduct escapeway drills and maintain escapeways in safe condition and assure that lifelines are being maintained.
  • ATMOSPHERIC MONITORING SYSTEMS (AMS) – Utilize AMS to monitor strategic locations for carbon monoxide, oxygen content, methane content, and air volumes.

Click here for: Single Source page MSHA Online (web page), Spanish Fatalgram (pdf)

Fatality #2 for Coal Mining 2010

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On Friday, January 22, 2010, at approximately 9:15 a.m., a 29 year old continuous miner operator with 12 years of mining experience was fatally injured when a rib roll, approximately 70 inches high, 63 inches long, and 103 inches wide, occurred. The victim was operating a remote control continuous mining machine to clean a previously bolted crosscut when he was struck by the coal rib and pinned against the mine floor.

Best Practices

  • Conduct a thorough visual examination of the roof, face, and ribs immediately before any work or travel is started in an area and thereafter as conditions warrant.
  • Adequately support or scale any loose rib or roof material before beginning work.
  • Perform careful examinations of pillar corners, particularly where the angles formed between entries and crosscuts are less than 90 degrees.
  • Permanently support openings that create an intersection before any work or travel in the intersection.
  • Be alert to changing geologic conditions which may affect roof/rib conditions.

Click here for: MSHA Investigation Report (pdf), Spanish Fatalgram (doc)

Fatality #12 for Metal/Nonmetal Mining 2009

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On June 20, 2009, a 52-year old equipment oiler/greaser with 24 years of experience was fatally injured at an underground salt mine. He was cleaning equipment when a large roof fall occurred.

Best Practices
  • When ground conditions create a hazard to persons, install effective ground support before other work is permitted in the affected area.
  • Design, install, and maintain a support system to control the ground in places where persons work or travel.
  • Examine and test ground conditions in areas where work is to be performed prior to work commencing and as ground conditions warrant during the shift.
  • Be alert to any change of ground conditions.
  • Identify and scale loose ground from a location which will not expose persons to falling material.

Click here for: MSHA Investigation Report(pdf), Overview(powerpoint), Overview(pdf)

Fatality #11 for Metal/Nonmetal Mining 2009

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On June 11, 2009, a 57-year old mechanic with 31 years of experience was fatally injured at an underground lead/zinc mine while checking for a hydraulic leak on a loader. The victim leaned into the ejector plate relief port in the back of the loader bucket. The ejector plate of the bucket was retracted, crushing him against the back of the bucket.

Best Practices
  • Train persons to recognize work place hazards.
  • Establish safe work procedures before a task is performed.
  • Securely block equipment and components against hazardous motion at all times while performing maintenance work.
  • If equipment and components are to be moved, always verify persons are aware and in a safe location prior to movement.
  • Consult and follow the manufacturer's recommended safe work procedures for the maintenance task.

 
Click here for: MSHA Investigation Report(pdf), Overview(powerpoint), Overview(pdf)