High-carbon ferrous product containing spheroidal graphite.
Bennett
Slow crack propagation that is accompanied by noticeable plastic
deformation and requires energy to be supplied from outside the body.
ASM, 1
The ability of a material to deform plastically without fracturing.
Sections of air duct. See also:ventilation tubing
A calcian variety of annabergite, (Ni,Ca)3 (AsO4 )2
.8H2 O, in which about one-third of the nickel is replaced by
calcium; Pibble Mine, Scotland.
The amount of royalty or ore payable to the lord of the manor or owner of
the soil. Fay
a. Fine dry coal (usually anthracite) obtained from a coal-preparation
plant. The size range is 3/16 to 0 in (4.8 to 0 mm). See also:gum;
slack. Nelson
b. Smalls, usually with an upper size limit of 3/8 in (9.5 mm).
BS, 4
c. Term used among British miners for a fine mixture of coal and rock.
Tomkeieff
d. Aust. The fine coal left after separating the lumps; very fine
screenings; dust.
e. Coal dust and other unsaleable small coal produced in anthracite mines.
See also:anthracite fines
Aust. An unproductive claim or mine. Hess
A furnace used for the manufacture of producer gas. Fay
A monoclinic mineral, Fe2+ Fe3+4 (PO4 )
3 (OH)5 .2H2 O ; forms green botryoidal crusts
commonly associated with limonite in gossans. Syn:kraurite;
green iron ore.
A monoclinic mineral, Pb2 As2 S5 ; sp gr, 5.6; in
crystalline dolomite in the Binnental, Switzerland.
An orthorhombic mineral, PbCu(AsO4 )(OH) ; adelite group; sp gr,
6.4; at Tsumeb, Namibia.
A gold-washing dish used in Jashpur, India.
Som. A method of hoisting coal on an incline from the working face to the
pit bottom by a rope attached to the winding engine at surface in such a
way that while the cage is going up, the empty trams are running down the
incline, and as the cage descends the loaded cars are brought up to the
shaft.
a. Brist. Slack ventilation; insufficient air in a mine.
b. As applied to the degree of luster of minerals, means those minerals in
which there is a total absence of luster, as chalk or kaolin.
A field term denoting the degree of luster of attrital coal as it compares
to the brilliant luster of vitrain associated in the same locality.
CF:bright attritus
Coal consisting of vitrain and durain with more or less minor clarain and
minor fusain. AGI
a. Any coal that absorbs the greater part of incident light instead of
reflecting it. Stopes recognizes two kinds of dull coal--durain and
fusain. Tomkeieff
b. The constituent of banded coal macroscopically somewhat grayish in
color, of a dull appearance, less compact than bright coal, and breaking
with a rather irregular fracture. It consists mainly of two kinds of
material; thin black bands interlayed by a lighter colored
granular-appearing matter. Microscopically, it consists of smaller
anthraxylon constituents together with a few other constituents, such as
cuticles and barklike constituents embedded in a general matrix, the
attritus. AGI
c. A variety of banded coal containing from 20% to 0% of pure, bright
ingredients (vitrain, clarain, and fusain), the remainder consisting of
clarodurain and durain. AGI
A Malayan term for hardwood pan shaped like a section of the surface of a
sphere and used as a miner's pan in prospecting, sample washing, and
manual concentration of cassiterite. See also:pan
A barge similar to a hopper barge, frequently used to take dredged
material from a dredger to the dumping ground. Hammond
Choked or clogged, as a grate or sieve in which the ore is beneficiated.
Fay