A fan installed in an underground opening. A booster fan can be used as
the main mine fan but is more commonly used to improve or augment the
ventilation in a segment of the mine. Booster fans are illegal in U.S.
coal mines but are used in metal mines and coal mines in other countries.
Hartman, 2
a. A pump used to increase the pressure of fluids, such as to increase the
pressure of water delivered to a drill when the source pressure is too low
to be used for drilling operations. Long
b. A pump that operates in the discharge line of another pump, either to
increase pressure or to restore pressure lost by friction in the line or
by lift. Nichols, 1
In long-distance pumping of liquids or mineral slurries, an intermediate
pump station. Pryor, 3
a. A projecting portion of a reinforced concrete beam, acting as a corbel
to support the facing material, such as brick or stone; the lower end of a
bucket elevator. Hammond
b. A leather or tin joint connecting the blast main with the tuyere or
nozzle in a bloomery.
c. A suspended enclosure in the nose of a tank protecting a portion of the
surface and serving as a gathering opening. ASTM
d. The bottom of a bucket elevator, which receives feed for delivery into
an elevating bucket. Pryor, 3
A monoclinic mineral, CuSO4 .7H2 O ; melanterite group; of a
lighter blue than chalcanthite, from which it differs in its larger
proportion of water.
The ejection of balled drill cuttings from the collar in long, tubelike
masses. Long
a. The part of a drilled blasthole that remains when the force of the
explosion does not break the rock completely to the bottom of the hole.
See also:socket
b. See:trespass
One engaged in coal bootlegging. Applies to the worker in bootleg holes as
well as the worker who cleans the coal in a small, impermanent breaker,
and the trucker who conveys the coal to market. Bootleggers call
themselves independent miners. Korson
The mining and/or selling of coal produced from coal owned by others and
without permission or knowledge of the owner.
See:boose
An orthorhombic mineral, 8[Mg6 B14 O26 Cl2 ] ;
isometric above 265 degrees C in hard, glassy, cubic and octahedral
crystals; strongly pyroelectric; in evaporites, a source of boron.
Borate ore. Bennett
A salt or ester of boric acid; a compound containing the radical BO (super
3+)3 . CF:nitrate; carbonate. AGI
A monoclinic mineral, 4[Na2 B4 O5 (OH)4 .8H
2 O] ; soft; deposited by evaporation from alkaline
lakes, playas, hot springs, and as surface efflorescence or crystals
embedded in lacustrine mud. A source of boron. Syn:tincal
See also:octahedral borax
In blowpipe analysis, a drop of borax that when fused with a small
quantity of a metallic oxide will show the characteristic color of the
element; e.g., a blue borax bead indicates the presence of cobalt.
Standard, 2
A chemical test to disclose the presence of certain metals in a sample. A
clear glassy bead of borax fused in a wire loop will react chemically with
the salts of certain metals and yield colors that help to identify the
metal; e.g., manganese compounds produce a violet bead, cobalt produces a
deep blue, etc. See also:blowpiping
a. Newc. A passage or breast, driven up the slope of the coal from the
gangway, and hence across the grain of the coal. A bord 4 yd (3.7 m) or
more wide is called a wide bord, and one less than 4 yd in width is called
a narrow bord. Also spelled board.
b. A side gallery parallel with the main road or drift.
Standard, 2
c. A road with solid coal sides. Mason
d. A narrow coal drivage in the pillar-and-stall method of working.
Nelson
e. A joint in a coal seam. See also:cleat
f. Eng. A road driven at right angles to the main cleavage planes of the
coal. SMRB
A method of working coal seams. First bords are driven, leaving supporting
pillars of coal between. Next, cross drives connect the bords, leaving
supporting coal as rectangular pillars. Finally, the pillars are mined
(extracted, won, robbed) and the roof is allowed to cave in. The bordroom
is the space from which bord coal has been removed. Syn:bord-and-wall;
stoop-and-room. See also:breast-and-pillar; stret;
Warwickshire method. Pryor, 3
A system of mining in which the distinguishing feature is the winning of
less than 50% coal on the first working. It is more an extension of the
development work than mining. The second working is similar in principle
to top slicing. The remainder of the coal is won by a retreating system,
the cover being caved after each unit has been worked. The term
bord-and-pillar is not used to any great extent in American mining
literature, but has a place in English literature. Various names have been
applied to this method, such as checkerboard system, Brown panel system,
following up the whole with the broken, Lancashire bord-and-pillar system,
modified room-and-pillar working, narrow working, North Staffordshire
method, rearer method of working inclined seams, rock-chute mining, room
system, room system with caving, Warwickshire method of working contiguous
seams, wide or square work, and pillar-and-breast. Fay
N. of Eng. A system of mining in which interlacing roadways are driven at
right angles into the seam, leaving small square or rectangular pillars of
coal of from 30 to 50 yd (27 to 46 m) side length, which are then wholly
or partly extracted by a small group. Syn:tub-and-stall; bord-and-wall.
See also:room-and-pillar
See:bord-and-pillar; bord-and-pillar working.