Other

Patrick L Carney

Robert W Perry

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.

Blasting method and composition

The present invention describes a method of using 1.1 solid rocket propellant in the detonation process for explosives. The use of the 1.1 solid rocket propellant is described as a booster for use in a blasting cap.

Beneficial use of class 1.1 rocket propellant

A method of quarry blasting is provided wherein boreholes are loaded with alternating layers of ANFO and AP propellant. A primary charge is used to detonate the composition column. The low velocity propellant enhances the ANFO explosion, and produces high pressure gas and high temperatures for breaking and casting the rock, while minimizing fly rock, ground vibrations, and air noise.

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Dubuque, IA, United States of America

Patrick L Carney