Method of smelting galena concentrates in a reverberatory furnace with a
crucible well in its hearth. Pryor, 3
See:ultramylonite
A touchstone consisting of siliceous slate. AGI
System of pulleys incorporated in the return-side tracking of a belt
conveyor, which turns it through 180 degrees , so that any adherent
abrasives do not come in contact with idler pulleys. Pryor, 3
a. Widening of underground roadway by removing rock from sides.
Pryor, 3
b. The working of 2 to 5 yd (1.8 to 4.6 m) or more of the rib side coal in
a narrow stall or heading. See also:skipping
Collier who moves a coal cutter to a new working place; to flit is to
shift equipment. Pryor, 3
A low truck or trolley used in pillar methods of working to transport face
machines from one heading or bord to another. Nelson
a. A general term for loose fragments of ore or rock, esp. on a hillside
below an outcropping ledge or vein. Syn:floater
float ore.
b. Fine gold that floats in panning and other operations and is lost.
von Bernewitz
c. A timber platform, faced with boiler iron on both sides, and provided
with rings at the corners for lifting. It is used in shaft work to prevent
the crushing of the bottom timbers by flying fragments of rock.
Stauffer
d. The tendency of the bit in a flat-angle borehole to follow an
increasingly flat course as the depth of the borehole increases.
Long
e. In mineral concentration, the response of a specific mineral to the
flotation process. Pryor, 3
f. The fine dust that does not settle out of the air current in the
grinding mills but is filtered out by fine cloth bags. Also, the fine dust
collecting on the roof and timbers in a mine.
g. Metal particles so fine that they float on the surface of water in
crushing or washing, as float gold.
h. Various forms of ball-and-seat valves commonly inserted in casing and
rod strings in such a manner as to keep drilling fluid out of the casing
or rod string when lowered into a borehole. Also called float valve.
Long
i. To lift a material by the buoyant action of a strong current or flow of
a liquid medium; also, that material buoyant enough to float on the
surface of a liquid medium. Long
j. The buoyant part of an apparatus for indicating the height of water in
a steam boiler or of liquid in a tank.
In mineral concentration, word used in connection with response of a
specific mineral to flotation process. Pryor, 3
Use of a series of heavy liquids diminishing (or increasing) in density by
accurately controlled stages for the purpose of dividing a sample of
crushed coal into gravimetric fractions either equal-settling or
equal-floating at each stage. The floats at a given specific gravity are
defined as the percentage floating at that density and the sinks have a
defined higher density. Each product (minus one density and plus another)
is analyzed after weighing and the ash sulfur and Btu content is found.
From this testing, a washability curve is drawn that relates density with
ash sulfur and Btu content, in the form of cumulative float, sink, and
specific gravity curves. The ash curve plots ash against density for
successive fractions. The densimetric curve plots specific gravity against
cumulative weight. The Mayer curve (M-curve) plots cumulative weight
against that of a constituent (e.g., ash). Pryor, 3
Small, irregularly shaped isolated deposits of coal imbedded in sandstone
or in siltstone. They appear to have been removed from the original bed by
washout during the peat stage and to have been carried a short distance
and redeposited. Syn:raft
Fine scales of metallic copper that do not readily settle in water.
Fine particles of coal suspended in the air.
A single fragment of float. See also:float
Particles of gold so small and thin that they float on water and may be
carried off by it.
Said of large particles in a sedimentary rock that are not in contact with
each other and are contained in a fine-grained matrix; e.g., quartz grains
disseminated in limestone.
In seismic operations in a watercovered area, a cable connecting geophones
suspended by floats. AGI
A method of designing optimum extraction sequences for an open pit mine.
"Cones" of material are built using an ore block as a base and economic
net value of the cone is calculated. The process is repeated for each ore
block in a deposit, considering cone overlaps. The term "floating" is
derived from the "movement" of the cone throughout the model.
As used in flotation, a system in that the rate of change of the
manipulated variable is a continuous function of the actuating signal.
Fuerstenau
A pipe supported on pontoons that is used for removing spoil from a
suction dredger. Hammond
An isolated, displaced rock mass in alluvium. CF:float