a. A sliding member working in a guide, interposed between a cam and the
push rod or valve system that it operates, to eliminate side thrust on the
latter. CTD
b. The collar under which a cam is inserted so as to lift a stamp. Also
called disk. Fay
a. Opening the outlet of a melting furnace to remove molten metal.
ASM, 1
b. Removing molten metal from a furnace. ASM, 1
c. The act of boring a hole into old workings to release gradually any
accumulation of water and gas. This may be followed by driving an advance
heading into the area. As the heading is extended, boreholes are kept in
advance of the face to prevent the sudden breakthrough of water.
See also:inrush of water
A mechanical device consisting of a short piece of casing cemented in the
collar of a borehole at the upper end of which is affixed a gate or large
plug valve followed by a rod stuffing box. Utilizing this assembly,
underground drilling can be accomplished safely in areas of high
hydrostatic pressure. Long
See:tap bar
A plastic clay used in plugging the tap-hole of a smelting furnace.
Standard, 2
Boring a hole into old workings to release gradually any accumulation of
water and gas. The borehole tapping may be followed by driving an advance
heading into the area. As the heading is extended, boreholes are kept in
advance of the face to prevent the sudden breakthrough of water.
See also:inundation; inrush of water. Nelson
a. A thick brown to black viscous organic liquid, free of water, which is
obtained by condensing the volatile products of destructive distillation
of coal, wood, oil, etc. It has a variable composition, depending on the
temperature and material used to obtain it. AGI
b. Any of various dark brown or black, bituminous, usually odorous,
viscous liquids or semiliquids that are obtained by the destructive
distillation of wood, coal, peat, shale, and other organic material, and
yield pitch on distillation. Webster 3rd
c. Soft pitch or thickened petroleum, found in cavities of some
limestones. Fay
An orthorhombic mineral, Ba4 Fe4 (B2 Si8 O
27 )O2 Cl ; forms a series with titantaramellite; forms
reddish-brown radiating fibrous aggregates; at Candoglia, Piemont, Italy.
A monoclinic mineral, Na2 CaFe3 Al2 (Si6 Al
2 )O22 (OH)2 ; amphibole group with magnesium
replacing iron toward magnesiotaramite; black; at Wali-tarama, Mariupol,
Ukraine.
An orthorhombic mineral, K2 CrO4 ; has the olivine
structure; yellow.
An interstratified mica and clay.
A triclinic mineral, Zn2 (PO4 )(OH) ; forms a series with
paradamite; at Broken Hill, Kabwe, Zambia. Syn:salmoite
a. To weigh mine cars when empty in order to determine the weight of coal
in a car when the loaded car is weighed, done at specific intervals so
that miners paid on a tonnage basis may receive proper credit for coal
that they have loaded. BCI
b. Allowance for weight of packing or container in which goods are moved.
The difference between gross and net weight. Pryor, 3
a. Sliding weight on a leveling rod used in surveying, to enable the
staffman to read the line of collimation. In underground leveling, a bead
on a hanging plumbline used for the same purpose; distance from this to
the roof or working is then measured. Pryor, 3
b. The point a borehole or exploration work is intended to reach.
c. The distinctive marking or instrumentation of a ground point to aid in
its identification on an aerial photograph. It is a material marking so
arranged and placed on the ground as to form a distinctive pattern over a
geodetic or other control-point marker, on a property corner or line, or
at the position of an identifying point above an underground facility or
feature. AGI
d. The image pattern on an aerial photograph of the actual mark or target
placed on the ground prior to photography. AGI
e. The vane or sliding sight on a surveyor's level rod; a device, object,
or point upon which sights are made. AGI
A type of leveling staff provided with a sliding target, which can be
moved by the staffman, under direction from the leveler, to a position in
which it is in line with the line of sight of the level, the staff reading
being recorded by the staffman. CTD
Asphalt that is made artificially from grit, crushed stone, or gravel and
is bonded or coated with tar or a tarbitumen mixture. See also:premix
Nelson
A thin alteration film that forms on mineral surfaces, esp. on copper
minerals, with color and luster different from that on fresh fractures.
A metallurgical process in which large charges of lead ore are roasted at
low temperatures in furnaces and treated substantially, such as in the
Carinthian process. The residual containing considerable lead is remelted
in special furnaces. Fay
a. The coating of piles used for permanent work with prepared acid-free
tar before driving. The tar is obtained from the high-temperature
carbonization of coal in horizontal retorts. Nelson
b. The act of coating, (as of a pipe) with tar.
The number of tons or the amount of ore or material that can or should be
loaded either by mechanical loaders or by hand loaders. Also called score.
Jackson, 2
Specific training given to a miner prior to performing a task where the
worker has had no previous work experience. CF:new miner training;
refresher training. Federal Mine Safety