A portable unit consisting of a prilled explosive reserve tank feeding
into an air-activated loading tube. The equipment should be grounded to
guard against buildup of static electricity and possible accidental
explosive detonation. The blasthole charger permits rapid loading of
prilled explosives into blastholes drilled in any direction.
Any rotary, percussive, fusion-piercing, churn, or other type of drilling
machine used to produce holes in which an explosive charge is placed.
Syn:shothole drill
An explosive material that meets prescribed criteria for insensitivity to
initiation. It is a material or mixture consisting of fuel and oxidizer
used in blasting, but not otherwise defined as an explosive. The finished
mixture used for shipment or transportation cannot be detonated by a No. 8
test detonator cap when unconfined.
A piece of iron pipe, usually about 1/2 in (1.3 cm) in diameter, used to
provide a smooth passageway through the stemming for the miner's squib. It
is recovered after each blast and used until destroyed. Fay
a. A detonator containing an ignition explosive mixture, a primary
initiating charge, and a high-explosive base charge, encapsulated in an
aluminum or copper shell. Caps are initiated either electrically or
nonelectrically. See also:waterproof electric blasting cap
b. A small sensitive charge placed in the larger explosive charge by which
the larger charge is detonated. See also:electric detonator
BCI
A cartridge containing an explosive to be used in blasting. Fay
A shotfiring cord together with connecting wires and electric blasting
caps used in preparation for the firing of a blast in mines, quarries, and
tunnels.
Explosive substances used in mining and quarrying. Hess
A screen erected to prevent damage to equipment and supports in the
vicinity of the blasting point. See also:curtain; shot-firing curtain.
Syn:blasting cord
a. A slow-burning fuse used in blasting operations. Standard, 2
b. A fine core of gunpowder enclosed in the center of jute, yarn, etc.,
for igniting an explosive charge in a shothole. See also:safety fuse
Nelson
An instrument that provides a simple means for testing electric blasting
circuits, enabling the blaster to locate breaks, short circuits, or faulty
connections before an attempt is made to fire the shot. With its use,
misfires may be prevented to a great extent. To test a circuit, one wire
should be placed on one terminal of the instrument and the other wire on
the other terminal. If the needle is not deflected, it indicates that the
circuit is broken; if it is an electric blasting cap that is being tested,
this should be discarded. Pit and Quarry
A high explosive, consisting of nitroglycerin and nitrocotton. It is a
strong explosive, and a rubberlike, elastic substance, unaffected by
water. Taken as a standard of explosive power. CF:dynamite
Fay; BS, 12
A written record of information about a specific blast as may be required
by law or regulations. Atlas
A portable dynamo that generates enough electric current to detonate
electric blasting caps when the machine rack bar or handle is given a
quick, downward push. Syn:battery
M.E. 6 exploder. Long
A mat of woven steel wire, rope, scrap tires, or other suitable material
or construction to cover blastholes for the purpose of preventing flying
rock missiles. Meyer
A pointed instrument for piercing the wad or tamp of a charge of
explosive, to permit introducing a blasting fuse. Standard, 2
Blasting the working face in a coal mine without providing a second free
face by cutting or shearing before blasting. CFR, 4
See:nitroglycerin