Blasting Awareness

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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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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Report missing explosivesimmediately


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Ensure that any vehicle used totransport explosives is properly

secured and attended.


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Verify that inventories of explosivesare correct

Copy is maintained in magazine with

duplicate at mine office



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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?



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Post proper authorities phone

numbers in conspicous locations


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Periodically inspect magazines forevidence of tampering or theft


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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

Blasting Awareness

Documents

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