A wire rope comprising 7 wires of the same size covered by 12 wires
alternately large and small. Lewis
An orthorhombic mineral, (Mg,Ti,Fe,Al)2 (BO3 )O ; forms
dull, brownish-black prismatic crystals having perfect cleavage.
A safety appliance placed near the upper end of an inclined haulage road
to stop a tram running wild down the incline. It consists of a heavy beam
longer than the height of the roadway and is normally held up entirely at
roof level, but is hinged at the lower end. In the event of a tram running
away from above, a haulage hand can pull a rope that releases the upper
end of the beam that drops and stops the tram. Nelson
A method of mining contiguous seams. See also:bord-and-pillar
Fay
a. Loose or eroded surface material (such as gravel, sand, silt)
collected, transported, and deposited by running water, such as on the
lower slopes of a mountain range; esp. coarse alluvium. Syn:wash stuff
AGI
b. An alluvial placer. AGI
c. In coal mining, a washout. Nelson
d. The wet cleaning of coal or ores. Nelson
e. Auriferous gravel. Fay
f. To clean cuttings or other fragmental rock materials out of a borehole
by the jetting and buoyant action of a copious flow of water or a
mud-laden liquid. The similar ejection of core or drill spring equipment
from a borehole. See also:alluvial cone
Coal properties determining the amenability of a coal to improvement in
quality by mechanical cleaning. BS, 5
A curve or graph showing the results of a series of float-and-sink tests.
A number of these curves are drawn to illustrate different conditions or
variables, usually on the same axes, thus presenting the information on
one sheet of paper. Washability curves are essential when designing a new
coal or mineral washery. There are four main types of washability curves:
characteristic ash curve, cumulative float curve, cumulative sink curve,
and densimetric or specific gravity curve. Nelson; BS, 5
a. Drilling by use of jet water applied inside a casing pipe, in
unconsolidated ground. Pryor, 3
b. A test hole from which samples are brought up mixed with water.
Nichols, 1
A drill rig utilizing the jet action of a high-pressure stream of water to
produce a borehole in soft or unconsolidated material. Long
a. A bottle or flask fitted with two glass tubes passing through the
stopper, so that on blowing into one tube a stream of water issues from
the other tube. The stream may be directed upon anything to be washed or
rinsed. Newer wash bottles are made of flexible plastic with a single
tube. Hess
b. A bottle for washing gases by passing them through liquid contained in
it. Hess
In coal preparation, the jig box in which feed is stratified and separated
into fractions (heavier below and lighter above). A feldspar washbox has a
bedding of that mineral. Pryor, 3
The valve-timing cycle determining the periods of air admission and
exhaust. BS, 5
The individual portions into which the part of a washbox below the screen
plate is divided by transverse division plates, each being capable of
separate control. BS, 5
A sill fitted over a center extraction chamber. BS, 5
An adjustable plate situated between the feed end and the discharge end of
a washbox and serving to regulate the forward movement of material through
the box. BS, 5
The sections into which a washbox is divided by transverse division plates
that extend above the screen plate to form a weir; each compartment
usually comprises two or more cells. BS, 5
That part of the washbox over which the washed coal passes out of the box.
Usually the discharge sill is a part of the discharge-end refuse
extraction chamber. BS, 5
That part of the washbox over which the feed passes when it enters the
box. Usually the feed sill is a part of the feed-end refuse extraction
chamber. BS, 5
a. The perforated plate or grid that supports the bed of material being
treated. BS, 5
b. Also called grid plate; sieve plate; bedplate.
A washbox air valve operated by means of a reciprocating motion. Also
called washbox piston valve. BS, 5
a. The tailings or material discarded in the operation of washing an
alluvial deposit for gold. Nelson
b. Gold-bearing earth worth washing. Also called wash stuff; wash gravel.
See also:washing stuff