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7/28/2019 Blasting Awareness
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Blasting & Flyrock Awareness
Recognizing the Hazards
Prevent injury to people
Prevent damage to property
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Blasting activities are carefully regulated by
several governmental agencies.
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Legal Standards
OSHA
29 CFR Part 1910 - General Industry
29 CFR Part 1926 - Construction
MSHA
56.6000 - Metal & Non-Metal Mines
Bureau of Alcohol, Tobacco and Firearms
DOT
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Blaster Qualifications
Knowledge and Experience
Training
Physical Ability
Evidence of Competency
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Basic
Blasting
Terminology
Blaster-in-Charge
Blasting Plan Blast Area
Flyrock
Early-Warning
Signal Final-Warning
Signal
All-Clear Signal
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Rock blasting is thecontrolled use of
explosives to
excavate or
remove rock.
It is a technique
used most oftenin mining and civil
engineering.
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7/28/2019 Blasting Awareness
8/74Blaster-in-Charge
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Best Practices:
ensuring that all personnel have evacuated the blast areaduring shot firing;
using adequate blasting shelters for employees whose
presence is required in the blast area
controlling and monitoring all entrances to the blast area;
ensuring that the blast is properly designed,
drilled, and loaded; and
emphasizing education and training to enhance skill
levels for implementation of engineering control techniques.
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Conduct Pre-Blast Meeting Review of weather conditions
Communicate number of holes
Calculate bags per hole
Discuss reasons to turn off electronicdevices
Review personnel location
Discuss stemming process
Discuss gas and fume releases Remind those working alone to stay
in communication w/supervisor
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Stemming
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Blasting Shelter
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Drilling Blast Holes
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Storage of Explosives
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Transport of Explosives
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An example of a firing pattern which provides separate
delay time for the blastholes and gives good fragmentation
as well as good breakage.
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Blast Area
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Understanding
WarningSignals & Signs
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Two warnings are
common
HOWEVER, some sites
use only one signal!
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Early-Warning Signal
___ minutes before shot is fired.
Warns holes have been loaded withexplosives and prepared.
Means blast area is clear, guards have
stopped traffic into area. Blast crew inspects grounds to make sure
no people or equipmen is in the blast area.
Every sites warning signals are unique!!
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Final-Warning Signal
___ minutes before
firing.
Timing is different on
each site.
Radio silence is
necessary.
Guards will halt blast
if they sight anyone
in area.
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All-Clear Signal
Blaster can't order the all-clear signal just
yet.
The blaster must inspect the area to see ifthere are any misfires.
It may take minutes, hours or days to
determine if there is a misfire.
Stay out until the All-Clear signal sounds.
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Warning Signals
Be alert and share information
Know the blasting time, blast area
and clearing procedure; and
Do not enter the blast areauntil an all-clear signal is sounded.
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Blast Logs - Recorded Evidence
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The location of the blast within the
permit area allows the regulator toverify the distance.
Know the location of the blast
Check the distance!!
North
Jones
Residence
690 Feet
Permit Area
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Rock blasting in northern Ontario to make way for new highway upgrades.
The six exposures were taken over a span of 3 seconds.
This animation is displayed over 6 seconds.
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E ti ki it i l i bl ti
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Excavation crews working on sites involving blasting
operations may be exposed to the hazards of undetonated
charges during removal of blasted rock.
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Flyrock is caused by a mismatch of the distribution
of the explosive energy, geomechanical strength
of rock mass, and confinement.
A B C D E
Optimum Depth
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A professional baseball pitch averages 90 mph, or slightly faster.
Flyrock has been clocked at 400 mph. Can you dodge that?
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Protect Yourself!
July 2002 - West Virginia
A truck driver and his supervisor were
watching a blast from 1/2 mile away -waiting for the "all clear" signal.
A rock slammed into the front
windshield and exited the rear. Itsomehow missed both people. No
one was hurt.
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PPE
Hard hat
Safety-toed shoes
Reflective vest
Safety glasses
Gloves
Hearing protection
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MSHA Part 48
State of Alaska: 11 AAC 95.335. Blasting Standards
(a) A person may not discharge an explosive in the following areas withoutfirst obtaining a variation under11 AAC 95.235:
(1) Type A or Type B stream riparian areas in Region I; and
(2) within all riparian areas in Region II or III.
(b) During blasting, an operator shall minimize the amount of flyrock
materials deposited into fish-bearing waters.
Authority:
AS 41.17.010
AS 41.17.080
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Explosives Security Reminder
Inspect, verify each magazine is properly secured
according to all applicable regulations, company
policy, as well as manufacturers recommendations
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Explosives Security Reminder
Report missing explosivesimmediately
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Explosives Security Reminder
Ensure that any vehicle used totransport explosives is properly
secured and attended.
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Explosives Security Reminder
Verify that inventories of explosivesare correct
Copy is maintained in magazine with
duplicate at mine office
Explosives Security Reminder
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Explosives Security Reminder
Verify persons identify before allowing them to enter
explosive magazines or review inventory records
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Explosives
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Misfires found during the post-blast
inspection
Exclude all employees from danger zone.
No other work except that required to clear themisfire.
Only the Blaster-in-Charge handles all the
sequence of events following a misfire.
Extra care must be taken, as the designed pattern
HAS changed.
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E l i S it R i d
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Review facilitys security measuresAre further measures necessary to protect explosives from theft?
Explosives Security Reminder
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Explosives Security Reminder
Post proper authorities phone
numbers in conspicous locations
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Explosives Security Reminder
Periodically inspect magazines forevidence of tampering or theft
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Explosives Security Reminder
Immediately report shortages, loss ortheft of any explosive material to:
1-888-ATF-BOMB
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Conclusion:
Good communication between the
driller, blaster, access control guard,
and miners is the key to a safe blastingoperation.
Thank you for your participation.
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Other regulated operations
Underground transportation of
explosives - 1926.903
Use of safety fuse - 1926.907
Use of detonating cord - 1926.908
Underwater blasting - 1926.912
Blasting in excavation work under
compressed air - 1926.913