In bituminous coal mining, a foreman who is in charge of workers picking
impurities from coal as it is dumped into railroad cars at the mine
surface. DOT
a. The steel or timber frame at the top of a shaft, which carries the
sheave or pulley for the hoisting rope and serves various other purposes.
Also called gallows frame; hoist frame; head stocks. CTD; Hess
b. The shaft frame, sheaves, hoisting arrangements, dumping gear, and
connected works at the top of a shaft or pit. Also called headgear.
Pryor, 3
c. Includes all the raised structure around the shaft that is used for
loading and unloading cages. Mason
d. Can. Gallows over the shaft to which cable for hoisting is attached.
Hoffman
a. See:headframe
b. That portion of the winding machinery attached to the headframe, or the
headframe and its auxiliary machinery. Fay
See:hard way
a. The house or building that encloses the headframe. Fay
b. The structure on a hillside to control the lowering of coal to the
tipple. BCI
a. A passage leading from the gangway, commonly at right angles in a coal
mine. Korson
b. A smaller excavation driven in advance of the full-size section; it may
also be driven laterally, as a cross heading or side drift. A heading may
be driven at the top or the bottom of the full-size face. Stauffer
c. The vein above a drift. Fay
d. An interior level or airway driven in a mine. Fay
e. A road in the solid strata but also in the seam; a road in solid coal.
Mason
f. In a tunnel, a digging face and its work area; the end of a drift or
gallery that is being advanced by the mining operation. Nichols, 1
g. A gangway, entry, or airway. Hudson
h. The gravel bank above a sluice in a placer. Standard, 2
i. A continuous passage between two rooms, breasts, or other working
places. Fay
j. A collection of close joints. Fay
k. Sometimes applied to the preliminary drift or pioneer bench in tunnel
driving. Fay
A method of tunneling in hard rock. The heading is in the upper part of
the section and is driven only a round or two in advance of the lower part
or bench. Fraenkel
A stoping method used in thicker ore where it is customary first to take
out a slice or heading 7 to 8 ft (2.1 to 2.4 m) high directly under the
top of the ore and then to bench or stope down the ore between the bottom
of the heading and the bottom of the ore or floor of the level. The
heading is kept a short distance in advance of the bench or stope.
Syn:heading-and-stope mining
See:room-and-pillar
A method of quarry blasting in which the explosive is confined in small
tunnel chambers inside the quarry face. The charges are placed at suitable
intervals according to the burden to be blasted. In large blasts, several
tunnels and cross tunnels may be employed. See also:chamber
Syn:tunnel blast
The heading is the lower part of the section and is driven at least a
round or two in advance of the upper part, which is taken out by overhand
excavating. Syn:inverted heading and bench
a. Coarse gravel or drift overlying placer deposits. Fay
b. The portion of a vein that is above a level.
c. Highly jointed parts of granite. Arkell
d. In ore beneficiation, the purest ore obtained by washing, as opposed to
middlings and tailings. Also called concentrates. See also:heads
See:joint
See:footwall
See:footwall
In dredging, the line that holds the dredge up to its digging front. This
line is anchored well ahead of the dredge pond or paddock and attached to
a winch on the dredge. Lateral movement is controlled by sidelines
similarly led from winches to land anchorages, usually two on each side.
See also:sideline
Vibrator of shaking table that imparts reciprocating motion to the deck.
Pryor, 3
A fill structure consisting of any materials, other than a coal processing
waste or organic material, placed in the uppermost reaches of a hollow
where side slopes of the existing hollow measured at the steepest point
are greater than 20 degrees , or the average slope of the profile of the
hollow from the toe of the fill to the top of the fill is greater than 10
degrees . In fills with less than 250,000 yd3 (191,000 m (super
3) ) of material, associated with steep slope mining, the top surface of
the fill will be at the elevation of the coal seam. In all other
head-of-hollow fills, the top surface is the fill, which when completed,
is at approx. the same elevation as the adjacent ridge line, and no
significant area of natural drainage occurs above the fill draining into
the fill areas.
The top poling boards in a heading. Stauffer
a. The discharge pulley of the conveyor. It may be either an idler pulley
or a drive pulley. A head pulley that is mounted on a boom is termed an
extended head pulley; a head pulley that is separately mounted is termed a
detached head pulley. NEMA, 2
b. The crowned pulley or idler mounted at the extreme front end or
delivery point of a belt conveyor. The belt, after passing around this
pulley, begins its travel toward the tail end or foot section of the
conveyor. Jones, 1