Entrance to an oven. Noke
A twin-jawed bucket without teeth; usually hung from the boom of a crane
that can be either crawler or wheel mounted. The bucket is dropped in the
open position onto the material to be excavated or handled. It is then
closed, encompassing material between the two hinged halves.
A grab-type loader activated by cables. Used in mucking operations.
Lewis
A compositional category for classifying igneous rocks; e.g., the
rhyolite-granite clan. A clan may be defined either by mineralogical or by
chemical composition. Clans are subdivided into families. AGI
In inclined shaft timbering, a joint in which the end pieces are checked
into the cap and sill for a distance of approx. 1 in (2.5 cm), with a
bevel on the inner side. Higham
The wave pattern established when waves are reflected by a barrier so that
the crests and troughs occur alternately in the same places with water
particle motion limited to vertical movement, while a quarter wavelength
away the particle motion is horizontal (back and forth). This is a
standing wave phenomenon. Hy
A coal lithotype characterized macroscopically by semibright, silky luster
and sheetlike, irregular fracture. It is distinguished from vitrain by
containing fine intercalations of a duller lithotype, durain. Its
characteristic microlithotype is clarite. CF:clarite; fusain; vitrain.
AGI
a. The cleaning of dirty or turbid liquids by the removal of suspended and
colloidal matter. See also:recirculation of water
b. The concentration and removal of solids from circulating water to
reduce the suspended solids to a minimum. BS, 5
A centrifuge, settling tank, or other device for separating suspended
solid matter from a liquid. Hess
A tank for clarifying cyanide or other solutions; frequently provided with
a filtering layer of sand, cotton waste, matting, etc. Fay
a. The major maceral or micropetrological constituent of clarain. It is a
heterogeneous material that is generally translucent in thin section, and
in which there may be intercalated lenticels of such other ingredients,
such as xylinite, fusinite, resinite, suberinite, periblinite, collinite,
and ulminite. AGI
b. Strictly, not a maceral, but may be used for repetitive description.
Tomkeieff
A coal microlithotype that contains a combination of vitrinite and exinite
totalling at least 95%. The proportions of these two macerals may vary
widely, but each must be greater than the proportion of inertinite, and
neither must exceed 95%. Distinction may be made between spore clarite,
cuticular clarite, and resinous clarite. Clarite is widely distributed and
very common, particularly in clarain-type coals and occurs in fairly thick
bands. CF:clarain
The average abundance of an element in the crust of the Earth.
CF:clarke of concentration
A mineral, (Na,Ca,Pb)2 U2 (O,OH)7 ; strongly
radioactive; metamict; massive; dense; forms as an alteration product of
uraninite. Syn:brown gummite
The concentration of an element in a mineral or rock relative to its
crustal abundance. The term is applied to specific as well as average
occurrences. CF:clarke
A sample-reducing device that splits a batch sample of ground ore into two
equal streams as it falls across an assembly of deflecting chutes.
Pryor, 3
A rock-type coal consisting of the maceral vitrinite (tellenite or
collinite) and large quantities of other macerals, mainly micrinite and
exinite. Micrinite and exinite are present in larger quantities than
vitrinite. Syn:clarodurite
The term clarodurain was introduced by G.H. Cady in 1942, and in the
modified form, clarodurite was adopted by the Nomenclature Subcommittee of
the International Committee for Coal Petrology in 1956 to designate the
microlithotype with maceral composition between that of clarite and
durite, but closer to durite than to clarite. It occurs in fairly thick
bands; is widely distributed; and, like duroclarite, is a common
constituent of most humic coal. Syn:clarodurain
A rock-type coal consisting of the macerals fusinite and vitrinite and may
contain all other macerals. Fusinite is present in a larger quantity than
in fusoclarain. CF:fusoclarain
A rock-type coal consisting of the maceral vitrinite (collinite or
telinite) with smaller amounts of other macerals. CF:vitroclarain
AGI
See:clastic rock