The percentage, usually by weight and sometimes by number or count, of
particles in each size fraction into which a powdered sample of a soil,
sediment, or rock has been classified--such as the percentage of sand
retained on each sieve in a given size range. It is the result of a
particle-size analysis. Syn:size distribution;
size-frequency distribution. AGI
The process of crushing or grinding material to reduce the particle size.
BS, 2
Separation of solid particles, in a fluid (air, water, etc.), because of
different densities or masses. Bennett
A measure of the intensity of ground vibration generated from a blasting
event, specif. the time rate of change of the amplitude of ground
displacement, given in inches (or millimeters) per second.
Refers to particles collected by filtration from ambient air.
SME, 1
a. A lamina or very thin sedimentary layer separating thicker strata of a
different type; e.g., a thin layer of shale or slate in a coal bed, or a
shale break in sandstone. Strata tend to separate readily at partings.
CF:band
b. A small joint in coal or rock, or a layer of rock in a coal seam.
See also:back
c. The physical property of some specimens of mineral species to break
along specific crystallographic planes because of twinning or chemical
alteration along them; e.g., rhombohedral parting in corundum.
CF:cleavage; fracture. Syn:mineral parting
d. Cutting simultaneously along two parallel lines or along two lines
which balance each other in the matter of side thrust.
e. The final process after cupellation to remove the silver from bullion
bead.
f. A side track or turnout in a haulage road on which empty or loaded cars
are collected for distribution to points for loading or for haulage to the
surface or to the shaft or slope bottom for hoisting.
In bituminous coal mining, a laborer who directs the movement of mine cars
from a parting (a side track). Also called connection man; parting boy.
See also:parting
See:parting and connection man
In bituminous coal mining, one who only picks out seam partings (layers of
rock) in the coal working face prior to blasting, using a long-handled
pick. DOT
Density maintained in the bath in dense media separation. Pryor, 4
A flask used to separate gold and silver, such as by quartation, in
assaying procedures. Syn:parting glass
See:parting flask
Any of several liquids--such as tetrabromethane, ethylene dibromide,
pentachlorethane, and trichlorethylene--that are used in the DuPont
mineral separation process. See also:DuPont process
A powder made from chalk, bone meal, or similar nonsiliceous material,
suitably waterproofed, which is applied to a pattern to ensure a clean
strip from the molding sand. Osborne
A term applied to a thin layer of slate between two seams of coal.
Fay
A curve indicating, for each specific gravity (or size) fraction, the
percentage that is contained in one of the products of the separation;
e.g., the reject. Syn:distribution curve
The density corresponding to 50% recovery as read from a partition curve.
Syn:tromp cut point
The percentage of a specific gravity (or size) fraction recovered in one
of the products of the separation; e.g., the reject.
Syn:distribution factor
A resistivity method in which a special electrode configuration is used,
consisting of five electrodes, instead of the usual number of four, to
provide a check on the observations. Schieferdecker
The separation size corresponding to 50% recovery as read from a size
partition curve. BS, 5