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.
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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.
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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.
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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.
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MULTIPLE FIRING
Electrically firing with delay blasting caps in a number of holes at one time.
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LEG WIRE
One of the two wires forming a part of an electric blasting cap or squib.
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HORIZONTAL AUGER
A rotary drill, usually powered by a gasoline engine, for making horizontal blasting holes in quarries and opencast pits.
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BLASTING
1. Cleaning materials by a blast of air that blows small abrasive particles against the surface. 2. The act of detonating an explosive.
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BULLING BAR
A bar for ramming clay into cracks containing blasting charges which are about to be exploded.
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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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