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© 2010 Boart Longyear. All rights reserved.
TM
Company confidential – unauthorized use or
distribution prohibited
Fall Arrest Incident
2
© 2010 Boart Longyear. All rights reserved.
TMCompany confidential – unauthorized use or distribution prohibited
Fall Arrest Incident
On November 13/2010, there was a Fall Arrest Incident that could have had dire consequences if procedures were not followed.
A worker was in the process of cleaning the floor with a blow pipe on a blast that benched when the ground he was standing on failed.
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© 2010 Boart Longyear. All rights reserved.
TMCompany confidential – unauthorized use or distribution prohibited
Fall Arrest Incident
Through the investigation there are some key points that have come to light.
A 6’ X 6’ drop raise was blasted without any incident On November 10, 2010 a driller on N/S was instructed
to assist the client to blast 3 rings to open the slot and then to go to another level and continue drilling
The client decided to blast 13 rings into the slot raise against the advice from our driller. The blast subsequently benched.
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© 2010 Boart Longyear. All rights reserved.
TMCompany confidential – unauthorized use or distribution prohibited
Fall Arrest Incident
What went wrong There was no blast letter issued hence no engineering control The decision to blast that much ground into a 6’X6’ opening
didn’t allow for the swell of the rock. Possibly what caused the blast to bench
The failure of the bench was slow enough that the locking mechanism of the Sala block didn’t engage
The worker fell approximately 15 feet into the open stope When he fell he lost his hard hat While the worker was suspended, material was falling from the
edge, striking him
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© 2010 Boart Longyear. All rights reserved.
TMCompany confidential – unauthorized use or distribution prohibited
Fall Arrest Incident
What went right A site inspection was done on the mucking level and on the
working level to inspect bench Worker was trained and using a fall arrest system There were other workers present on watch There was a rescue ladder nearby The spotter was well experienced and knew what to do
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© 2010 Boart Longyear. All rights reserved.
TMCompany confidential – unauthorized use or distribution prohibited
Fall Arrest Incident
What could have been done better There should have been a rescue plan in place Worker should not have been working on the bench. There should have been 3 anchors in place. One for the
worker, one for the spotter and one for the rescue ladder The rescue ladder should have been anchored and ready for
use A Sala block should not have been used in this situation. Use
fall restraint instead
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© 2010 Boart Longyear. All rights reserved.
TMCompany confidential – unauthorized use or distribution prohibited
Fall Arrest Incident
Here are some pictures
from the scene
See if you can spot any mistakes
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© 2010 Boart Longyear. All rights reserved.
TMCompany confidential – unauthorized use or distribution prohibited
Fall Arrest IncidentPlan view
Benched area wherefloor failed (3 rings blasted)
Pillar
Open Hole (10 rings blasted)
Sala block
Worker blowingbench here
6’X6’ Drop Raise
Drift
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© 2010 Boart Longyear. All rights reserved.
TMCompany confidential – unauthorized use or distribution prohibited
Fall Arrest Incident
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© 2010 Boart Longyear. All rights reserved.
TMCompany confidential – unauthorized use or distribution prohibited
Fall Arrest Incident
Shock absorber on harness Shock absorbing lanyard
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© 2010 Boart Longyear. All rights reserved.
TMCompany confidential – unauthorized use or distribution prohibited
Fall Arrest Incident
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© 2010 Boart Longyear. All rights reserved.
TMCompany confidential – unauthorized use or distribution prohibited
Fall Arrest Incident
Improper anchor, not rated for 5000 lbs
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© 2010 Boart Longyear. All rights reserved.
TMCompany confidential – unauthorized use or distribution prohibited
Fall Arrest Incident
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© 2010 Boart Longyear. All rights reserved.
TMCompany confidential – unauthorized use or distribution prohibited
Fall Arrest Incident
Snap hooks are connected together , roll out could occur
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© 2010 Boart Longyear. All rights reserved.
TMCompany confidential – unauthorized use or distribution prohibited
Fall Arrest Incident
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© 2010 Boart Longyear. All rights reserved.
TMCompany confidential – unauthorized use or distribution prohibited
Fall Arrest Incident
Ladder wasn’t secured before incident
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© 2010 Boart Longyear. All rights reserved.
TMCompany confidential – unauthorized use or distribution prohibited
Fall Arrest IncidentBench failure – Top view
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© 2010 Boart Longyear. All rights reserved.
TMCompany confidential – unauthorized use or distribution prohibited
Fall Arrest Incident
Draw point was empty before incident
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© 2010 Boart Longyear. All rights reserved.
TMCompany confidential – unauthorized use or distribution prohibited
Fall Arrest Incident
Questions?