Ammunition and explosives – Blasting – Patterned blasting
Patent
1993-09-07
1997-01-21
Nelson, Peter A.
Ammunition and explosives
Blasting
Patterned blasting
102313, 102289, 149124, 149 46, 149 76, F42B 300, A45C 1310
Patent
active
055961657
ABSTRACT:
A method and composition for blasting wherein boreholes are loaded with pre-determined quantities of a high velocity explosive and a low velocity explosive. The high velocity explosive extends in a substantially continuous matter for a pre-determined length along the borehole column and a low velocity propellant is placed at pre-determined locations within the high velocity explosive column such that the high velocity explosive detonates substantially along its length in the column thus initiating a low velocity explosion at various predetermined points at the location of the low velocity explosive. The resulting explosion produces minimum ground vibration and air shock waves while substantially breaking and casting the rock material with minimal flyrock.
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