A covellite that occurs in cubes with cubic cleavage and is probably
pseudomorphous after chalcopyrite that had replaced galena; from the
Canton Mine, Georgia. Hess
Usually applied to brattice cloth, which is a heavy canvas of cotton,
hemp, or flax, frequently fireproofed. Jones, 1
A simple square frame of about 2-in by 2-in (5.1-cm by 5.1-cm) pieces tied
with diagonal strips and covered with brattice; used for deflecting air
currents at inby points where the pressure is low. Nelson
Inclined rectangular table covered with canvas. The pulp, to which clear
water is added if necessary, is evenly distributed across the upper
margin. As it flows down, the concentrates settle in the corrugations of
the canvas. After the meshes are filled, the pulp feed is stopped, the
remaining quartz is washed off with clear water, and finally the
concentrates are removed (by hose or brooms). Liddell
a. A long, deep, relatively narrow steep-sided valley confined between
lofty and precipitous walls in a plateau or mountainous area, often with a
stream at the bottom; similar to, but larger than, a gorge. It is
characteristic of an arid or semiarid area (such as the Western United
States) where stream downcutting greatly exceeds weathering; e.g., the
Grand Canyon. AGI
b. Any valley in a region where canyons abound. Etymol: anglicized form of
American Spanish canon. CF:canada
c. A precipitous valley; a gorge. Also spelled canon.
d. Mex. A mine-level drift or gallery.
a. A detonator or blasting cap. Nelson
b. To seal, plug, or cover a borehole. Long
c. The roof or top piece in a three-piece timber set used for tunnel
support. Nichols, 1
d. A piece of plank or timber placed on top of a prop, stull, or post.
Long
e. The horizontal member of a set of timber used as a roadway support.
Nelson
f. Another name for crown. ASTM
g. Barren rock and/or soil covering an ore deposit. See also:cap rock
Long
h. Overburden consisting of unconsolidated material overlying or covering
bedrock. Also called cover; mantle. Syn:top
i. See:blue cap
a. The capacity to store electrical energy; measured in farads,
microfarads, or micro-microfarads. Hunt
b. In flotation, a property expressible by the ratio of the time integral
of the flow rate of material or electric charge to or from a storage,
divided by the related potential change. Fuerstenau
An alternative to inductive control is to employ a capacitor in series
with the choke and therefore to obtain a leading power factor for the
circuit. The current in a capacitive circuit is less affected by changes
in voltage than that in an inductive circuit. Therefore, should there be a
sudden drop in mains voltage, the capacitively controlled lamp is less
likely to be extinguished than the inductively controlled lamp.
Roberts, 2
An electric appliance or an adjustable electric appliance used in circuit
with a motor to adjust the power factor. Pryor, 3; Kentucky
capacitor-discharge blasting machine
A blasting machine in which electrical energy, stored in a capacitor, is
discharged into a blasting circuit containing electric detonators.
a. As applied to mines, smelters, and refineries, the maximum quantity of
product that can be produced in a period of time on a normally sustainable
long-term operating rate--based on the physical equipment of the plant,
and given acceptable routine operating procedures involving labor, energy,
materials, and maintenance.
b. As applied to diamond and rotary drills, the load that the hoisting and
braking mechanism of a diamond or rotary drill is capable of handling on a
single line, expressed in feet or meters as the depth to which the drill
can operate with different size bits. Long
c. In ore dressing, the capacity of a screen is the measure of the amount
of material that can be screened in a given time, and is typically
measured in tons per square foot per hour per millimeter of aperture.
Newton, 1
a. The ratio between the breaking strength of a winding rope and the load
suspended on it (excluding the weight of the rope itself). Nelson
b. A method of assessing the size of a rope. The capacity factor of the
rope is the static factor of safety of the rope at the capping; i.e., the
breaking strength of the rope divided by the weight of the loaded cage or
skip and the suspension gear comprising the chains, or equivalent
equipment, and a detaching hook. Sinclair, 5
The maximum load that can be carried safely. Crispin
As applied to mining, the ability of the market to buy, esp. with regard
to the quantity that can be placed in the market, and to the prices that
can be obtained. Stoces
A mechanical device for crimping the metallic shell of a fuse detonator or
igniter cord connector securely to a section of inserted safety fuse.
See also:crimper
Crocidolite asbestos found near Prieska, South Africa.
See also:crocidolite
A diamond with a yellowish tinge. Pryor, 3
a. A wall of a lode; so called by Cornish miners, primarily where the
country rock adjacent to the lode has been more or less altered by the
same mineralizing agencies through which the lode was formed.
Syn:carrack; cappel; capping. See also:capel lode
b. A fitting at the end of the winding rope to enable the bridle chains of
the cage to be connected by a pin through the clevis.
Corn. A lode composed of hard unpromising feldspar containing minute
particles of chlorite. See also:capel
Brilliantly red garnet, gem stone. Other varieties are carbuncle and
Bohemian garnet. CF:pyrope
a. The action by which a fluid, such as water, is drawn up (or depressed)
in small interstices or tubes as a result of surface tension.
Syn:capillary action
b. The state of being capillary. AGI
c. A phenomenon observable when making borehole inclination surveys by the
acid-etch method, wherein the upper surface of the acid curves upward,
forming a concave surface. When the acid bottle is in a vertical or
horizontal position, the concave surface is symmetrical, and the resultant
etch plane is horizontal. When the bottle is tilted, the concave surface
is asymmetric; the resultant etch plane is not horizontal, and the angle
so indicated is always greater than the true inclination of the borehole.
A capillarity correction is applied. See also:etch angle;
capillarity correction. Long
d. The action by which the surface of a liquid, where it is in contact
with a solid, is elevated or depressed depending upon the relative
attraction of the molecules of the liquid for each other and for those of
the solid. Esp. observable in capillary tubes, where it determines the
elevation or depression of the liquid above or below the level of the
liquid in which the tube is dipped. Webster 3rd