The collection of basic facts about, and the testing of, surface and
subsurface materials (physical properties, distribution, and geologic
structure) at a site, for the purpose of preparing suitable designs for a
mine, an engineering structure, or other use. AGI
A rivet driven on a construction site. See also:shop rivet
Hammond
To separate minerals according to various screen meshes.
Screen analysis of particle size (coal). Bennett
a. See:particle-size distribution
b. Analysis of crushed or ground materials on the basis of particle size.
Bennett
c. In sizing analysis of sands, the percentage of the sample retained on
each laboratory sieve in the range examined. Pryor, 3
A graphical representation of the size analysis of a mixture of particles
of various sizes, using an ordinary, logarithmic, or other scale.
BS, 5
The variation in dimensions of any ceramic product from the intended
dimensions.
Portion of a sample of sand lying between two size limits, the upper being
the limiting and the lower the retaining mesh. Pryor, 3
See:particle-size distribution
That between upper (limiting) and lower (retaining) mesh sizes with
reference to screened or classified material. Pryor, 4
The breaking of large coal, ore, or stone by primary breaker, or the
breaking of smaller sizes by grinding. See also:reduction ratio;
primary breaker. Nelson
A device attached to the intake of a dust-sampling instrument to remove
the bulk of the particles above 5 to 10 mu m in size; thus the resulting
sample is more representative of the health-hazard size range of dust--
mainly 5 mu m and smaller. See also:dust sampling
a. The arrangement, grading, or classification of particles according to
size; e.g., the separation of mineral grains of a sediment into groups
each of which has a certain range of size or maximum diameter, such as by
sieving or screening. AGI
b. See:screening
A punch used for pressing of the sintered compact during the sizing
operation. Osborne
A screen or set of screens normally used for dividing a product (for
example, washed coal) into a range of sizes. Also called grading screen
and classifying screen (undesirable usage). BS, 5
a. A hexagonal mineral, Mg6 Fe2 (CO3 )(OH)16
.4H2 O ; manasseite group; dimorphous with pyroaurite of the
hydrotalcite group.
b. The name was formerly used for the phosphates dufrenite and
chalcosiderite.
A pneumatic table of American design, for the drycleaning of coal. A
sizing ratio of 2:1 is desirably the maximum range of sizes that the table
can separate in one operation. See also:Kirkup table
See:scares
An old Swedish mining term for silicate gangue (amphibole, pyroxene,
garnet, etc.) of certain iron ore and sulfide deposits of Archean age,
particularly those that have replaced limestone and dolomite. Its meaning
has been generally expanded to include lime-bearing silicates, of any
geologic age, derived from nearly pure limestone and dolomite with the
introduction of large amounts of Si, Al, Fe, and Mg. In American usage,
the term is more or less synonymous with tactite.
See also:calc-silicate hornfels