Dense, insensitive, high-velocity explosives of great power and very high
water resistance. They are usually mixtures of an explosive such as TNT,
which is a reducing agent, or an oxidizing agent, such as ammonium nitrate
and/or sodium nitrate, and water. A thickening or jelling substance such
as guar gum is usually added. Slurries may also be made with nonexplosive
reducing agents, including finely divided metals such as magnesium or
aluminum, and with organic compounds such as sugar, molasses, or
emulsified oil. These slurries are used chiefly in open pit mines where
rock is hard and/or holes are wet. Also called DBA (dense blasting agent).
Nichols, 1
A laborer who makes slurry for use by furnace sprayer, mixing specified
amounts of silica, clay, and water in large drums with air-pressure hose.
DOT
The process of filling in joints with slurry. Osborne
See:furnace sprayer
Any natural or artificial pond or lagoon for settling and draining the
solids from washery slurry. BS, 5
A screen to recover a granular product from the circulating water in a
washer, usually after a preliminary concentration of the solids and with
or without the use of water sprays. BS, 5
a. To fill mine workings with sand, culm, or other material, by hydraulic
methods. See also:hydraulic mine filling
b. Silt.
c. To move ore or waste filling with a scraper (slusher) hoist.
a. See:scraper loader
b. A mechanical dragshovel loader. Mason
c. A mobile drag scraper with a metal slide to elevate the bucket to dump
point. Nichols, 1
Drift in stope block above haulage level, down which scraper loader
conveys broken ore to loading chutes, which are usually without gates.
Pryor, 3
In metal mining, one who operates the hoisting engine of a scraper loader,
known as a slusher, to load ore into cars or to scrape it into chutes, or
to move sand or rock fill in the stopes. DOT
Term sometimes applied to hydraulic stowing and also to scraper loader
operations. Nelson
A drift in an orebody, equipped wth a scraper loader, for loading ore
directly into cars in the haulage level. The drift is formed at right
angles to the haulage level and over it so that the ore drops into the
cars. Nelson
Used to coat metals, machine parts, etc., to prevent corrosion. It usually
is nondrying oil or grease, which coats the metal very well but is easily
removed when desired. Crispin
An excavation dug near a drill to form a reservoir in which the returns
from a borehole are collected and stored. Also called drill sump, mud pit,
sludge pit, slush pond, sump. Long
See:slush pit; sump.
Eng. Soft, black, bituminous shale with a white efflorescence on exposure.
A hard calcareous band near the base, Middle Purbeck Beds, Swanage.
Arkell
a. Coal broken into small pieces, usually smaller than stove size; slack.
Standard, 2
b. Coal with a top size less than 3 in (7.6 cm). BS, 2
Gr. Brit. Generally a colliery producing less than 1,000 st/d (907 t/d).
See:large colliery
Multiple row blasting with holes 1 to 3 in (2.5 to 7.6 cm) in diameter in
low-face quarries. Short-delay blasting is usually adopted using explosive
factors similar to those of large diameter holes. With smaller diameter
blastholes, the explosive charges can be brought up higher in the holes
and so provide better breakage in blocky ground. Nelson
A method for desulfurizing iron and steel with metal hydrides in which a
molten slag is floated on a mass of molten ferrous metal and at least one
metal hydride is introduced into the mass. The molten ferrous metal is
separated from the slag, the metallic hydrides breaking down into metal
and nascent hydrogen. Hydrides of the alkali metals have been found very
satisfactory and are readily available. Osborne
A coal mine employing not more than 50 persons below ground.