A long-handled, plierlike device similar to a certain type of blacksmith
tongs used to handle wash or drill rods in place of a safety clamp in
shallow borehole drilling. Also called adjustable pipe tongs; extension
tongs; lowering tongs. Long
A brown earthy variety of limonite. See also:limonite
A heavy, upright timber used for underpinning in opening a station for a
level in a mine. See also:brow bar
Ore imperfectly smelted, mixed with cinder and clay. Fay
Lanc. An inclined roadway driven to the rise. Also called brow; up-brow.
a. A trigonal mineral, Mg(OH)2 ; brucite group; perfect basal
cleavage; an alteration product of periclase in contact-metamorphosed
limestone; a magnesia refractory raw material.
b. The mineral group amakinite, brucite, pyrochroite, and theophrastite.
Pac. A form of revolving roasting furnace. See also:Bruckner furnace
Fay
Horizontal cylindrical furnace revolving on end trunnions.
See also:Bruckner cylinder
A Canadian term used to describe a windfall of dead trees and brush.
Syn:slash
Brunauer, Emmett, and Teller method
A procedure for the determination of the total surface area of a powder or
of a porous solid by measurement of the volume of gas (usually N2 )
adsorbed on the surface of a known weight of the sample. The mathematical
basis of the method was developed by S. Brunauer, P. H. Emmett, and E.
Teller--hence the usual name, B.E.T. method. Dodd
A compact pocket instrument that consists of an ordinary compass, folding
open sights, a mirror, and a rectangular spirit-level clinometer, which
can be used in the hand or on a staff or light rod for reading horizontal
and vertical angles, for leveling, and for reading the magnetic bearing of
a line. It is used in sketching mine workings, and in preliminary
topographic and geologic surveys on the surface, e.g., in determining
elevations, stratigraphic thickness, and strike and dip.
Syn:pocket transit
A mechanical sampling device that automatically selects 1/625 part of the
ore passing through the sampler, by means of an oscillating deflector
placed in a falling stream of the ore. Fay; Pryor, 3
a. To remove rock from the roof or floor of an opening to increase the
height of working (coal mines). See also:brushing
b. In a coal mine, a road through the goaf, gob, or worked-out areas
packed with waste. CTD
c. To clean up fine coal from the floor. CTD
d. Forest of Dean. A rich brown hematite.
e. Mixed load of large and small coal into a colliery tub.
Pryor, 3
f. Mid. To mix gas with air in a mine by buffeting it with a jacket.
g. To rip; to enlarge.
h. To remove bisque in a definite pattern by means of a brush.
See also:bolt-hole brush
A device consisting of bristles set in a suitable backing used for
cleaning a conveyor belt. It is usually of the rotary type.
In high-intensity electrical fields, discharge from sharp points along a
conductor. Electricity concentrates at these points and charges ambient
molecules of air, which are then repelled, carrying away charge. The
phenomenon is exploited in mineral processing in high-tension separation.
Pryor, 3
A short, stout, heavy hooked blade with a sharpened iron edge, attached to
an axe handle; typically used by surveyors for cutting brush. AGI
a. Scot. That part of the roof or floor of a seam removed to form
roadways.
b. Digging up the bottom or taking down the top of an entry or room, where
the seam of coal is too thin or shallow for the purpose of admitting cars.
See also:brush
c. Cutting or blasting down the roof of a coal seam. Arkell
d. Ripping; normally enlarging a road by taking down the roof, but
extended to sides and floor as well. Also called canch. Mason
e. Removal of dry enamel by brushing through a stencil or along an edge to
produce a design or edging. Bryant
Scot. The stratum brushed or rippled. See also:brush
a. A charge fired in the air of a mine to blow out obnoxious gases or to
start an air current.
b. A shot so placed as to remove a portion of the roof to increase the
height of a haulageway. See also:brush
A monoclinic mineral, CaHPO4 .2H2 O ; generally massive or
in slender crystals. Syn:metabrushite
A rake blade having a high top and light construction. Nichols, 1