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Prevent injury to people Prevent damage to property. Blasting & Flyrock Awareness Recognizing the Hazards. Blasting activities are carefully regulated by several governmental agencies. Legal Standards OSHA 29 CFR Part 1910 - General Industry 29 CFR Part 1926 - Construction MSHA

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Presentation Transcript

Prevent injury to people

Prevent damage to property

  • Blasting & Flyrock Awareness

  • Recognizing the Hazards



  • 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


Blaster qualifications
Blaster Qualifications

  • Knowledge and Experience

  • Training

  • Physical Ability

  • Evidence of Competency


Basic blasting terminology
Basic Blasting Terminology

  • Blaster-in-Charge

  • Blasting Plan

  • Blast Area

  • Flyrock

  • Early-Warning Signal

  • Final-Warning Signal

  • All-Clear Signal




  • Best Practices:

  • ensuring that all personnel have evacuated the blast area during 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.



  • Conduct Pre-Blast Meeting

  • Review of weather conditions

  • Communicate number of holes

  • Calculate bags per hole

  • Discuss reasons to turn off electronic

  • devices

  • Review personnel location

  • Discuss stemming process

  • Discuss gas and fume releases

  • Remind those working alone to stay

  • in communication w/supervisor







An example of a firing pattern which provides separate

delay time for the blastholes and gives good fragmentation

as well as good breakage.



Understanding warning signals signs
Understanding Warning Signals & Signs


Two warnings are common…

HOWEVER, some sites use only one signal!


Early warning signal
Early-Warning Signal

Every sites warning signals are unique!!

  • ___ minutes before shot is fired.

  • Warns holes have been loaded with explosives 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.


Final warning signal
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.


All clear signal
All-Clear Signal

  • Blaster can't order the all-clear signal just yet.

  • The blaster must inspect the area to see if there 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.


Warning signals
Warning Signals

  • Be alert and share information

  • Know the blasting time, blast area and clearing procedure; and

  • Do not enter the blast area

  • until an “all-clear” signal is sounded.



The location of the blast within the permit area allows the regulator to verify the distance
The location of the blast within the permit area allows the regulator to verify the distance.

  • Know the location of the blast

  • Check the distance!!

Permit Area

690 Feet

Jones

Residence

North


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.


Excavation crews working on sites involving blasting highway upgrades.

operations may be exposed to the hazards of undetonated

charges during removal of blasted rock.


Optimum Depth highway upgrades.

A B C D E

Flyrock is caused by a mismatch of the distribution

of the explosive energy, geomechanical strength

of rock mass, and confinement.


A professional baseball pitch averages 90 mph, or slightly faster.

Flyrock has been clocked at 400 mph. Can you dodge that?


Protect yourself
Protect Yourself! faster.

  • 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. It somehow missed both people. No one was hurt.


PPE faster.

  • Hard hat

  • Safety-toed shoes

  • Reflective vest

  • Safety glasses

  • Gloves

  • Hearing protection


Msha part 48
MSHA Part 48 faster.

  • State of Alaska: 11 AAC 95.335. Blasting Standards

  • (a) A person may not discharge an explosive in the following areas without first obtaining a variation under 11 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


  • Explosives Security Reminder faster.

  • Inspect, verify each magazine is properly secured

  • according to all applicable regulations, company

  • policy, as well as manufacturers recommendations




  • Explosives Security Reminder faster.

  • Verify that inventories of explosives are correct

  • Copy is maintained in magazine with duplicate at mine office


Explosives Security Reminder faster.

Verify person’s identify before allowing them to enter

explosive magazines or review inventory records


Explosives
Explosives faster.

MISFIRES

ARE

DEADLY


Misfires found during the post blast inspection
Misfires found during the post-blast inspection faster.

Exclude all employees from danger zone.

No other work except that required to clear the

misfire.

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.


Explosives Security Reminder faster.

  • Review facility’s security measures

  • Are further measures necessary to protect explosives from theft?





Conclusion
Conclusion: faster.

  • Good communication between the

  • driller, blaster, access control guard,

  • and miners is the key to a safe blasting

  • operation.

Thank you for your participation.


  • Other regulated operations faster.

    • 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


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