A local and sudden flood or torrent of relatively great volume and short
duration, overflowing a stream channel in a usually dry valley (as in a
semiarid area), carrying an immense load of mud and rock fragments, and
generally resulting from a rare and brief but heavy rainfall over a
relatively small area having steep slopes. It may also be caused by ice
jams and by dam failure. See also:freshet
a. An opal in which the play of color is limited to a single hue.
b. Opal in which the play of color is pronounced in one direction only.
a. Sympathetic detonation between explosive charges or between charged
blast holes. Dick, 2
b. The transmission of detonation from a cartridge to another one in line;
also, the tendency of a blast hole to be detonated by the shock wave from
an adjacent borehole. Syn:sympathetic detonation
The minimum temperature at which sufficient vapor is released by a liquid
or solid to form a flammable vapor-air mixture at atmospheric pressure.
Rapid removal of sulfur, as finely divided sulfide mineral is allowed to
fall through a heated oxidizing atmosphere. Flash roasting or melting is
widely used in the copper industry. Pryor, 3
A smelting process in which dried metal sulfide concentrates are blown
with oxygen or oxygen-rich air in a hot hearth-type furnace such that the
particles react rapidly with the oxygen to generate a large amount of
heat, partially (controlled) oxidizing the concentrates and producing a
molten matte phase containing the metal values, which will be further
processed, and a molten slag.
a. In foundry work, a molding box that holds the sand into which molten
metal is poured. The top half or part is its cope, the bottom half is its
drag, and it is furnished with locating lugs. Pryor, 3
b. An iron bottle in which mercury is marketed. It contains 76-1/2 lb
(41.3 kg). Fay
c. A tinned vessel in which a miner carries oil for a lamp or beverage for
a lunch.
d. A necked vessel for holding liquids; esp., a broad, flattened vessel of
metal or sometimes glass. Webster 3rd
a. In mine timbering, horizontal crosspiece or cap used in roof support.
b. Of a mining lode, one less than 15 degrees from horizontal in its dip.
Pryor, 3
c. A horizontal orebody, regardless of genetic type. AGI
d. A flat coal seam. Korson
e. A railroad car of the gondola type for shipping coal.
f. A dull diamond bit. See also:going bord
a. An arch in that both outer and inner surfaces are horizontal planes.
Harbison-Walker
b. In furnace construction, a flat structure spanning an opening and
supported by abutments at its extremities; the arch is formed by a number
of specially tapered bricks, and the brick assembly is held in place by
their keying action. Also called a jack arch. Harbison-Walker
A type of belt conveyor in that the carrying run of the conveyor belt is
supported by flat belt idlers or by a flat surface.
An idler consisting of one or more rolls supporting the belt in a flat
position.
A manner of placing the boreholes, for the first shot in a tunnel, in
which they are started about 2 to 3 ft (0.6 to 0.9 m) above the floor and
pointed downward so that the bottom of the hole is about level with the
floor.
See:lentil
A rotary end-cutting tool constructed from a flat piece of material
provided with suitable cutting lips at the cutting end. ASM, 1
Thin cleavages from the faces of a diamond crystal.
A borehole following a near horizontal course. Long
A belt idler that supports the belt in a flat position. NEMA, 1
One of a series of short, triangular hogbacks forming a spur or ridge on
the flank of a mountain, having a narrow apex and a broad base, resembling
(when viewed from the side) a huge flatiron; it usually consists of a
plate of steeply inclined resistant rock on the dip slope. AGI
In igneous rock, a joint dipping at an angle of 45 degrees or less. Rarely
applied to joints dipping more than 20 degrees . AGI
A lode which varies in inclination from the horizontal to about 15 degrees.
A cylindrical tool with a valve at the bottom, for boring through soft
clay. Fay