Method of controlled blasting
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United States of America Patent
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Sep 24, 2002
Grant Date -
N/A
app pub date -
Jul 20, 1999
filing date -
Oct 18, 1996
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The invention of the present application provides a method of controlled blasting comprising dispersing an explosive (9) within a blasthole (1) to form a dispersed explosive having a lower average bulk density than said explosive (9) prior to dispersion and detonating said dispersed explosive. Typically the explosive (9) is dispersed in air, however the explosive (9) may be dispersed in other matrices such as other gases or liquids or in gases comprising particulate matter. The explosive (9) may be dispersed using a number of different techniques such as, using a discharge of pressurised fluid or by detonation of a small propellant charge or by falling under gravity in the blasthole. The invention of the present application is particularly useful where a reduced concentration of explosive energy is required such as in perimeter control, presplitting or soft rock conditions, can be controlled by a method which involves dispersion the explosives composition (9) within a blasthole prior to initiating the blast. The dispersion of the explosive composition (9) within a blasthole (1) provides an in situ low density explosives composition.
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