A variety of chrysocolla, containing more than the usual percentage of
water.
Pertaining to or containing asphalt; e.g., asphaltic limestone or
asphaltic sandstone impregnated with asphalt, or asphaltic sand
representing a natural mixture of asphalt with varying proportions of
loose sand grains. AGI
Asphaltlike ore carrying invisible uranium values. Ballard
Any rock naturally impregnated with asphalt. It is generally sandstone or
limestone.
Any one of the naturally occurring black solid bitumens that are soluble
in carbon disulfide and fuse above 230 degrees F (110 degrees C). Examples
are uintahite, glance pitch, and grahamite. AGI
A porous rock, such as a sandstone or limestone, that is impregnated
naturally with asphalt. Syn:asphalt stone; rock asphalt. AGI
See:asphalt rock
To suffocate; to choke. Mason
See:dedusting
An apparatus for moving or collecting gases, liquids, or granular
substances by suction. Webster 3rd
a. To analyze the proportions of metals in an ore; to test an ore or
mineral for composition, purity, weight, or other properties of commercial
interest. Syn:crucible assay
b. The test or analysis itself; its results. AGI
A very sensitive balance used in the assaying of gold, silver, etc., for
weighing the beads. It usually has magnifying lenses for reading the
graduations. See:balance
Person who analyzes ores and alloys, esp. bullion, to determine the value
and properties of their precious metals. DOT
In determining the assay value of an orebody, the multiplication of its
assay grade by the number of feet along which the sample was taken.
CF:assay inch; assay value. AGI
The percentage of valuable constituents in an ore, determined from assay.
CF:assay value; value. AGI
In determining the assay value of an orebody, the multiplication of its
assay grade by the number of inches along which the sample was taken.
CF:assay foot; assay value. AGI
A laboratory for examining ores, usually gold and silver ores, in order to
determine their economic value. Standard, 2
Map of a mine showing the assay, stope, width, etc., of samples taken from
positions marked. Used to control grade and quality of ore mined and
milled. Pryor, 3
In sampling, a term used to describe the rate that the head value bears to
the mine sampling. This percentage figure is useful in reducing any extant
or subsequent mine-sampling average to that which in actual production it
will likely prove to be. In South Africa this is generally known as the
"mine call factor." Syn:correction factor
Agreed average value, as between buyer's and seller's assay, used as
pricing basis in sale of mineral. Pryor, 3
A weight of 29.166+ g, used in assaying to represent proportionately the
assay value of an ore. Because it bears the same ratio to 1 mg that a ton
of 2,000 lb bears to the troy ounce, the weight in milligrams of precious
metal obtained from an assay ton of ore equals the number of ounces to the
ton. Abbrev. AT. AGI