A METHOD OF BLASTING AN OPEN CAST BLAST HOLE
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United States of America Patent
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Issued Date -
Sep 26, 2019
app pub date -
May 12, 2017
filing date -
May 26, 2016
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Abstract
The invention provides a method of Wasting an open cast blast hole the method including placing one or more explosive charge in the blast hole, stemming the blast hole with stemming material above said one or more explosive charge, placing a propellant powder cartridge into the stemming material so that there is a layer of stemming material between the propellant powder cartridge and the explosive charge which is closest to the open end of the blast hole, and initiating the propellant powder charge with an igniter, or a detonator, or a fuse head, or any electronic initiation system.
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