A mill for dry-grinding mica by means of fluid energy. It consists of a
chamber containing two horizontal directly opposed jets. Mica is fed
continuously from a screw conveyor into this chamber. The particle size of
the product from this mill can be controlled over a broad range down to
the micrometer sizes. USBM, 7
Formerly called outside diameter. It refers to the largest diameter of a
thread on a screw or nut. Crispin
Used in widely different meanings in different manufacturing plants; the
meaning of the term depends on the special process of cutting used. Thus,
the faces of the major rhombohedron r 1011 are spoken of as the major face
when BT wafers are cut directly from a faced mother crystal. Also applied
to the prism faces that terminate in the faces of the major rhombohedron,
etc. Am. Mineral., 2
Defined by the Mine Safety and Health Administration, U.S. Department of
Labor, as any accident that results in the death of five or more persons.
Federal Mine Safety
The plane normal to the direction of the major principal stress.
ASCE
The largest (with regard to sign) principal stress. ASCE
A wide portion of a lode. CF:pinch
Mid. To yield or produce gas. A seam of coal that gives off combustible
gas is said to make gas. Fay
The rate of entry of water into a mine or part of a mine. Also called
growth. BS, 10
To assemble; to couple or screw together. Usually applied to the process
of assembling the component parts of a drill string or pipe system.
Long
See:makeup shed
Medium or medium solids added to the circuit to replace losses during the
separating operation. BS, 5
A surface building at which explosives, drawn from the magazine, are
issued and where the charges are prepared or made up.
Syn:makeup bunker
The time required to couple together the component parts of a drill or
casing string and the lowering of such a string to the working position in
a borehole. Long
a. Water supplied to a washery to replace that lost from the circuit.
BS, 5
b. Water supplied to replenish that lost by leaks, evaporation, etc.
Strock, 2
a. The depth gained in the day's drilling. Hess
b. The act of, or portion of work time spent in, actual drilling and
advancement of a bore or drill hole.
Newc. The small coal hewn out in undercutting or channeling. Also, in some
localities, called bug dust. Fay
A monoclinic mineral, Cu2 CO3 (OH)2 ; dimorphous with
georgeite; bright green; occurs with azurite in oxidized zones of copper
deposits; a source of copper. Syn:Atlas ore
a. A pale-colored, translucent variety of diopside with good (001)
parting; also diopside from Sala, Sweden.
b. See:diopside
A metamict variety of zircon. Also spelled malakon, malacone.
An isometric mineral, Au2 Bi ; pink to silver-white; intermetallic
compound. Syn:black gold