a. Syn:overburden
b. The overburden or rock deposit overlying a body of mineral or ore.
Nelson
c. See:gossan
d. The preparation of capped fuses. Nelson; Lewis
e. The process of sealing or covering a borehole and/or the material or
device so used.
f. The separation of a block of stone along the bedding plane.
g. The attachment at the end of a winding rope.
See also:continental gland-type capping;
interlocking wedge-type capping; white-metal cappel; capel.
Sinclair, 5
h. The fixing of a shackle or a swivel to the end of a hoisting rope.
CTD
i. The operation of fastening steel rope to a winding cage.
Pryor, 3
j. The name given to a method by which the spouting flow of a liquid or
gas from a borehole may be stopped or restricted; also, the mechanism
attached to borehole collar piping and so used. Long
A special room or building used solely for the preparation of capped
fuses. Nelson
a. Barren vein matter, or a pinch in a vein, supposed to overlie ore.
Syn:cap
b. A hard layer of rock, usually sandstone, a short distance above a coal
seam.
c. A disklike plate over part of or all of the top of most salt domes in
the Gulf Coast States and in Germany. It is composed of anhydrite, gypsum,
limestone, and sometimes sulfur. AGI
d. A comparatively impervious stratum immediately overlying an oil- or
gas-bearing rock. AGI
e. Eng. The cap rock of the alum shale, Estuarine sandstones on the
Yorkshire coast. Arkell
See:capstan
The sensitivity of an explosive to initiation by a detonator. An explosive
material is considered to be cap sensitive if it detonates with a No. 8
strength test detonator. Atlas
A term used in square-set mining methods to designate a set of timber
using caps as posts, resulting in a set of timber shorter than the normal
set.
A light shot of explosive placed on the top of a piece of shale that is
too large to handle, in order to break it. BCI
The upper horizontal beam in the timber framing of a bridge, viaduct, etc.
Fay
a. A spoollike drum mounted on a vertical axis used for heave hoisting or
pulling. It is operated by steam, electric power, or hand pushes or pulls
against bars inserted in sockets provided in the upper flange or head.
Long
b. Sometimes used as a syn. for cathead. Long
Aust. A mine that produces coal or mineral for use by the same company.
Nelson
The quantity of mineral product from a mine produced solely for use by the
parent company or subsidiary.
In a crystal structure, the substitution of a trace element for a major
element of lower valence; e.g., Ba+2 for K+ . Captured
trace elements generally have a higher concentration relative to the major
element in the mineral than in the fluid from which it crystallized.
CF:admittance; camouflage. AGI
a. A wheeled vehicle used for the conveyance of coal or ore along the
gangways or haulage roads of a mine. Also called mine car; tramcar; tub;
wagon; mine wagon. Zern; Fay
b. A wheeled carrier that receives and supports the load to be conveyed.
Generally attached to a chain, belt, cable, linkage, or other propelling
medium. See also:tray
A monoclinic mineral, Na3 Pb2 (SO4 )3 Cl ;
pseudohexagonal; forms crystalline incrustations.
An etchant consisting of 5 g of ferric chloride dissolved in 96 mL of
ethyl alcohol to which has been added 2 mL of hydrochloric acid; used in
etching nonferrous metals and manganese steels. Osborne
a. A unit of weight for diamonds, pearls, and other gems; formerly equal
to 3-1/6 troy grains (205 mg). The international metric carat (abbreviated
M.C.) of 200 mg was made the standard in the United States in 1913, as it
was the standard in Belgium, Denmark, Great Britain, France, Germany,
Japan, the Netherlands, and Sweden. A carat grain is 1/4 carat.
Syn:international metric carat
CF:point
b. Employed to distinguish the fineness of a gold alloy, and meaning 1/24
part. Pure gold is 24-carat gold. Goldsmiths' standard is 22 carats fine;
it contains 22 parts of gold, 1 part of copper, and 1 part of silver.
Fay
See:carat weight
The number of near-equal-size diamonds having a total weight of 1 carat or
200 mg; hence, 40 small diamonds weighing 1 carat would be called 40-count
diamonds, or 8 diamonds weighing 1 carat would be called 8-count diamonds.
Long
Diamonds averaging about 1 carat each in weight. Long
Amount of diamond material lost or worn away by use in a drill bit,
expressed in carats. Long
Total weight of diamonds set in a drill bit, expressed in carats. Also
called caratage. Long