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Prep LabCrushed Fingers Injury
Prep Lab Incident
In December of last year (2011) a supervisor in the prep lab was crushing ore samples with a rolls crusher. Oversized material became jammed in-between the roller heads, a common occurrence. The employee proceeded to turn the power off to the unit and attempted to remove the rock prior to locking out the unit.
The residual energy contained within the roller heads was sufficient enough pull in and crush the ring finger and middle finger of the employee.
Prep Lab Incident
Rolls Crusher before modifications were made to guarding
Prep Lab Incident
Rolls Crusher before Modifications were made to guarding
Prep Lab Incident
Basic Operation of a Rolls Crusher:
Large Ore Particles
The two rolls force the particles between their rotating surface into the ever smaller gap area, this fractures the rock from the compressive forces presented by the rotating rolls
Crushed material down to 10 mesh (about 2mm)
***WARNING*** The next slide shows the workers glove
caught between the rollers of the unit, this picture was taken right after the incident
Viewer discretion is advised(but I am sure many of you have seen much worse)
Prep Lab Incident
Picture taken after incident, this is the workers glove that was left in the rollers.
Prep Lab Incident • The employees injury is displayed in red.
• His bandages are still being changed on a daily basis, but the healing process is going very well.
• His only concern at the moment is his golf swing...
• Very positive attitude, realizing that this injury could have been much worse
Prep Lab Incident
• Steps taken at time of Incident:• Worker was given first aid and sent to
hospital• Scene was frozen, an investigation was
started and work area was shut down• Prep lab crew was assembled and
informed about the incident • New lock-out procedure implemented
immediately• Plans to review and update all Prep lab
SOP’s
Prep Lab Incident• Steps taken since Incident
• New hopper top over feed chute of rolls
Prep Lab Incident• Steps taken since Incident
• SOP for rolls crusher and other lab equipment have been reviewed and updated (including pictures and visual aids)
Prep Lab Incident• Steps taken since Incident
• Lock out procedure has been laid out step by step in SOP with picture representation
Rolls lock out
Prep Lab Incident• Direct causes:
• Failure to follow proper lock out procedure• Improper sequence (bypassing jaw crusher
which would create material of proper size for rolls crusher ) • Worker put hand in unsafe location• Inadequate guarding of rollers/chute
• Latent Causes • Experienced worker became complacent in
his position and put himself in a dangerous situation
Prep Lab Incident• Conclusion
• Supervisor has been put on light duty as he continues to recover• New hopper guard has been put in place to
keep workers from accessing moving rollers• Updated and more detailed SOP’s involve
locking out any machine in the prep lab when a jam or hang up occurs and,• Workers are being re-trained in safe work
practices with input from the JHSC, prep workers and management
Safety is Everyone's Responsibility... Especially Yours!
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