Three types of face belt joints are used: (1) hinged-plate type, which is
attached to the belt by means of copper rivets and interconnected by means
of pins; (2) wire-hook joints, the most popular type--the hooks are
inserted by means of a hand-operated machine and are connected by a
flexible steel pin; and (3) spliced joint, in which a portion on each side
of the belt is cut away so as to provide a splice, and this is secured by
cramped-type pins, which are inserted and knocked over by hand.
Mason
In bituminous coal mining, a foreman in charge of all operations at the
working faces where coal is undercut, drilled, blasted, and loaded. Also
called face foreman. DOT
The major joint or cleavage system in a coal seam. CF:butt cleat
See also:cleat; face.
The ratio of pithead output (tons) to length of face (yard) or tons per
yard of face. The management objective is to keep this figure as high as
practicable. See also:concentration of output
a. Any type of conveyor employed at the working face that delivers coal
into another conveyor or into a car. Nelson
b. See:underground mine conveyor
c. A conveyor, generally 10 to 100 ft (3.0 to 30.5 m) in length, used in
room and pillar mining to move material from the face to a room or section
conveyor. See also:armored flexible conveyor; gate conveyor.
NEMA, 2
Applied in the trade to a natural mass of quartz bounded by one or more of
the original crystal faces. Am. Mineral., 2
A bit designed for drilling in soft formations and for use on a
double-tube core barrel, the inner tube of which fits snugly into a recess
cut into the inside wall of the bit directly above the inside reaming
stones. The bit is provided with a number of holes drilled longitudinally
through the wall of the bit, through which the circulation liquid flows
and is ejected at the cutting face of the bit. Also called
bottom-discharge bit; face-ejection bit. Long
An entry driven at right angles to the face cleat and parallel to the butt
cleat. BCI
Face equipment is mobile or portable mining machinery having electric
motors or accessory equipment normally installed or operated inby the last
open crosscut in an entry or room.
Eng. A longwall face crossing the main cleavage planes of the seam at an
angle of 45 degrees . SMRB
Used for rough dressing stones. It has one blunt end and one cutting end.
Crispin
The transportation of mined coal from the working face to an intermediate
haulage. It is accomplished by shuttle cars, conveyors, locomotives, and
mine cars, or by combinations of such equipment. See:primary haulage
Woodruff
The vertical height of a quarry or opencast face from top to toe; i.e.,
the height of overburden and coal, ore, or stone. A face height is chosen
that can be reached by the excavator so that all scaling of loose material
can be accomplished by the machine, thus eliminating the necessity for
workers to go over the face on ropes to bar off loose ground. Where the
height exceeds this figure, a form of benching may be adopted.
See also:face
See:face right
See:kaliophilite
A shaker conveyor pan or trough that has been widened for one-half of its
length to provide a greater loading surface when used at the face.
Jones, 1
On a longwall face, the term implies the use of some type of cutter loader
with perhaps self-advancing ports, giving a quicker turnover and higher
productivity. In the case of a rock drivage the term would mean the
regular use of a shovel loader. See also:conventional machine mining
Nelson
The bottom of a borehole. Long
a. A location where the face of the breast or entry is parallel to the
face cleats of the seam. See:face
b. Working of a mine in a direction parallel to the natural cleats.
CF:end-on
See:end face