A method of blasting an open cast blast hole
AssigneeMaster Blaster Proprietary Limited
InventorMark Rodney DAVIS
Life of this patent
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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.
Claims8
A method of blasting 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.
-8. (canceled)
An initiation method for a propellant powder cartridge in which an igniter having a delay time of 400 ms difference with that of an explosive charge is placed in a same hole below the propellant powder cartridge.
Dependencies are inferred from the claim text.