The blasting out of different sections of rocks against each other.

Related Terms

PLASTER SHOOTING

A surface blasting method used when no rock drill is necessary or one is not available; consists of placing a charge of gelignite, primed with safety fuse and detonator, in close contact with the rock or boulder and covering it completely with stiff damp clay.

PILOT TUNNEL

A small tunnel or shaft excavated in advance of the main drivage in mining and tunnel building to gain information about the ground, create a free face, and thus simplify the blasting operations.

PARALLEL CUT

A group of parallel holes, not all charged with explosive, to create the initial cavity to which the loaded holes break in blasting a development round. Also known as burn cut.

MULTIPLE SERIES

A method of wiring a large group of blasting charges by connecting small groups in series and connecting these series in parallel. Also known as parallel series.

MULTIPLE FIRING

Electrically firing with delay blasting caps in a number of holes at one time.

LEG WIRE

One of the two wires forming a part of an electric blasting cap or squib.

HORIZONTAL AUGER

A rotary drill, usually powered by a gasoline engine, for making horizontal blasting holes in quarries and opencast pits.

BLASTING

1. Cleaning materials by a blast of air that blows small abrasive particles against the surface. 2. The act of detonating an explosive.

BULLING BAR

A bar for ramming clay into cracks containing blasting charges which are about to be exploded.

CAP CRIMPER

A tool resembling a pliers that is used to press the open end of a blasting cap onto the safety fuse before placing the cap in the primer.

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