» »Unlabelled » Re: DGMS Mailing List: Fatal Accident by Fly rock of blasting
Sunday 24 April 2016

8:15:00 pm

 

I agree with you.
At the same time special care should be taken at the time of surface connection.
It is very dangerous if it's mix-up with different timings of Nonel(very common mistake).Therefore it is necessary to take care for selection of Nonel for different hole before priming. 
Above of all determination of optimum charge factor and direction blast face is most important. 
 
With regards,

Ujjwal Mandal
(Mining Engineer)
Proprietor
Engineers & Contractor
School Danga South
P.O & P.S :Barjora
Dist: Bankura
PIN-722202 WB
Mob.:+91 9476212180/ +91 8972916506
Email ID:ujjwalmandal@yahoo.co.in
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From: "Manoj Raoot manojraoot@yahoo.co.in [dgms_mail_list]" <dgms_mail_list@yahoogroups.com>
To: dgms_mail_list@yahoogroups.com
Sent: Wednesday, 20 April 2016 8:47 AM
Subject: Re: DGMS Mailing List: Fatal Accident by Fly rock of blasting

 
Hi,

As a practicing blasting engineer, in addition to the measures provided for avoiding flyrock, I would suggest to clear the blast surface of lying rock pieces manually, more particularly near the blasthole's area of about one square meter, as this zone is more prone to generate flyrock, in spite of optimum charge factor.

This is bit tedious, in today's mechanized era, but while hook up is  being done, each hole influence area clearing may not take more than 2/3 minutes. Believe me, prevention is better than cure.
I am sure my fellow colleagues will agree with me.

Regards!
 
 
Manoj Raoot


On Wednesday, 20 April 2016 12:11 AM, "P purushnaik25@gmail.com [dgms_mail_list]" <dgms_mail_list@yahoogroups.com> wrote:


 
500 mtrs is equal to about 1667 feet.
Sent via Micromax

"B Arunachalam iyer_arunachalam@yahoo.ca [dgms_mail_list]" <dgms_mail_list@yahoogroups.com> wrote:

 
1200 feet is much less than 500 mtrs


On Sunday, April 10, 2016 8:20 PM, "Gajanan Jibhakate jibhakateg@yahoo.in [dgms_mail_list]" <dgms_mail_list@yahoogroups.com> wrote:


 
Gajanan.Jibhakate@ relianceada. Com


 
accident sceneNews from MSHA, USA
Fatal Accident by Fly rock of blasting
On March 22, 2016, a 42-year old lead man with 6 years of mining experience was fatally injured at a surface limestone mine when he was struck by fly rock from blasting operations. The lead man was parked in his pickup truck at a location to prevent others from accessing the blasting site. He was approximately 1,200 feet from the blast area.
Best Practices
  • Review and follow site specific blast plan prior to loading any explosives.
  • Utilize technology, such as face profilers and borehole probes, to obtain specific geometric details of the material to be blasted.
  • Adjust stemming depth and/or decking to maintain adequate burden on all sections of the blast hole.
  • Develop a drill pattern by considering geology, face geometry, and surface topography.
  • Clear and remove all persons from the blast area unless suitable blasting shelters are provided to protect persons from flyrock. Allow at least 15 seconds after a blast for any flyrock to drop.
  • Examine blast site geology, communicate with the driller and review the drill log for angles, voids, competency of rock, loss of air, etc., prior to the loading any explosives. Make appropriate adjustments to ensure that the holes are not overloaded.
  • Ensure blasting and fly rock areas are properly calculated to ensure the blast site is clear of all persons.
  • Determine the actual burden for all face holes along their length and adjust the explosive power factor along the borehole accordingly.
 

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Posted by Mining Engineer at 8:15:00 pm

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