Very good suggestion by Manoj. I do agree and observe the same during my tenure at working mines that stone lying near the charged holes are prone to fly. Secondly the stemming material. Stemming should not contain bigger stones. Ofcourse the best stemming material is drilling chips (angular pieces) which can interlock from pressure of explosion. This will avoid huge fog of dust also if no dust is used for stemming.
Kind regards
On Wed, Apr 20, 2016 at 8:47 AM, Manoj Raoot manojraoot@yahoo.co.in [dgms_mail_list] <dgms_mail_list@yahoogroups.com> wrote:
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 RaootOn 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.
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"B Arunachalam iyer_arunachalam@yahoo.ca [dgms_mail_list]" <dgms_mail_list@yahoogroups.com> wrote:
1200 feet is much less than 500 mtrsOn 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
News from MSHA, USA
Fatal Accident by Fly rock of blastingOn 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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