See:goergeyite
A hexagonal mineral, K2 Ca4 Al2 Be4 Si (sub
24) O60 .H2 O ; osumilite group; forms colorless to greenish
prisms. (Not millerite.)
Mellowed or ripened by weathering; said of brick clay; opposite of short
and rough. Standard, 2
Eng. Soft, loamy clay suitable for brickmaking, as opposed to stiffer clay
below, which is suitable for making tiles and drainpipes. Kimeridge clay,
Brill, Buckinghamshire. Arkell
Steel that contains from 0.12% to 0.25% carbon. Also called low-carbon
steel; soft steel. See also:yield stress
A standard of resistance in wire. The resistance of 1 ft (30.5 cm) of wire
that is 1 mil (25.4 mu m) in diameter. Crispin
See:colloidal sulfur
A translucent, milk-white to green, yellow, or blue variety of common
opal.
A milk-white, nearly opaque variety of quartz, commonly with a greasy
luster. The milkiness is due to the presence of minute, fluid-filled
inclusions. Syn:greasy quartz
a. A mineral treatment plant in which crushing, wet grinding, and further
treatment of ore is conducted. Also, separate components, such as ball
mill, hammer mill, and rod mill. See also:ball mill; hammermill;
rod mill; grinding mill; pug mill.
b. A passage connecting a stope or upper level with a level below,
intended to be filled with broken ore that can then be drawn out at the
bottom as desired for further transportation; an opening in the floor or
bottom of a stope, through which the ore or mineral is passed or thrown
downward along the footwall to the level. See also:glory hole
Fay
c. To fill a winze, or interior incline, with broken ore, to be drawn out
at the bottom. Fay
d. A finishing plant where blocks of stone are sawed and trimmed.
e. In quarrying, usually applied to the finishing plant where blocks are
sawed into slabs; all other manufacturing processes are classed as shop
work. AIME, 1
f. An excavation made in the country rock, by a crosscut from the workings
on a vein, to obtain waste for filling. It is left without timber so that
the roof may fall in and furnish the required rock. Fay
g. Can. Reducing plant where ore is concentrated and/or metals are
recovered. Hoffman
h. A single machine or a complete plant for rolling metals.
i. See:cogging mill
j. To grind or cut away steel or iron with a toothed or serrated face bit;
also, the tool so used. Long
k. Eng. That part of an ironworks where puddle bars are converted into
merchant iron; i.e., rolled iron ready for sale in bars, rods, or sheets.
See also:forge
l. A preparation facility within which metal ore is cleaned, concentrated,
or otherwise processed before it is shipped to the customer, refiner,
smelter, or manufacturer. A mill includes all ancillary operations and
structures necessary to clean, concentrate, or otherwise process metal
ore, such as ore and gangue storage areas and loading facilities.
SME, 1
m. By common usage, any establishment for reducing ores by other means
than smelting. More strictly, a place or a machine in which ore or rock is
crushed. Fay
A rough bar rolled or drawn directly from a bloom or puddle bar for
conversion into merchant iron in the mill.
A car without a roof for carrying hoisting apparatus. Standard, 2
A metal object lost in a borehole that has been cut or ground away with a
milling bit. Long
A four-index type of Miller indices, useful but not necessary in order to
define planes in crystal lattices in the hexagonal system; the symbols are
hkil, in which i = -(h + k). CF:Miller indices
Integers used to designate crystallographic planes. They are found as
follows: (1) Determine where the plane intercepts each crystallographic
axis in terms of multiples of the axial parameters; (2) take the
reciprocals of these numbers and clear of fractions and common factors.
These three numbers, designated (hkl), are the Miller indices for that
plane. CF:Bragg indices; Miller-Bravais indices; crystal face;
crystal indices; intercept. See also:symbols of crystal faces;
indices of a crystal face.
A brass-yellow to bronze-yellow rhombohedral mineral: NiS. It usually has
traces of cobalt, copper, and iron, and is often tarnished. Millerite
generally occurs in fine hairlike or capillary crystals of extreme
delicacy, chiefly as nodules in clay ironstone. Syn:capillary pyrite;
nickel pyrite; hair pyrite. (Not milarite.) AGI
In ore dressing, smelting, and refining, a laborer who regulates flow of
ore, coke, flue scrapings, or other materials from bins, chutes, or belts
into crushers, furnaces, or other equipment, or onto conveyor belts
leading to equipment. Syn:conveyor-feeder operator
A furnace for reheating iron that is to be rerolled, or welded, under a
hammer. Standard, 2
Som. Triassic dolomitic conglomerate.
a. Ore accepted for treatment in a concentrator, after any preliminary
rejection such as waste removal. Pryor, 4
b. Assay value, or units of value per ton, in ore accepted for treatment
in a concentrating plant or mill. Pryor, 3
The grade of ore as it comes from a mine and goes to a mill.
McKinstry