Utah. A variety of bitumen, probably elaterite. Tomkeieff
A device for screening and scalping that consists of a series of spaced
rotating, parallel rolls so constructed as to provide openings of a fixed
size. See also:grizzly
See:menilite
A miners' term for cinnabar.
A massive form of iron sulfide (marcasite and sometimes also pyrite and
pyrrhotite) having a dull liver-brown color.
A sandstone that breaks or cuts as readily in one direction as in another
and that can be worked without being affected by stratification; a dense
freestone that lacks natural division planes. AGI
A variety of barite that gives off a fetid odor when rubbed or heated.
A clay mineral intermediate to kaolinite and halloysite; a disordered
kaolinite.
Steam direct from the boiler and under full pressure. Distinguished from
exhaust steam, which has been deprived of its available energy.
Webster 3rd; Fay
A monoclinic mineral, HgSb4 S8 ; metallic lead gray.
A liquid medium that selectively extracts the desired metal from the ore
or material to be leached rapidly and completely, and from which the
desired metal can then be recovered in a concentrated form. SME, 1
See:leaching
See:leachate
A trigonal and hexagonal mineral, Mg3 Si2 O5 (OH)
4 ; kaolinite-serpentine group; polymorphous with antigorite,
clinochrysotile, orthochrysotile, and parachrysotile; forms a series with
nepouite; in platy masses as an alteration product of ultramafic rocks;
the most abundant serpentine mineral.
An approx. horizontal joint plane in igneous rocks.
Syn:primary flat joint
A term for an extensive tropical plain, with or without vegetation,
applied esp. to the generally treeless plains of northern South America
and the Southwestern United States. Etymol: Spanish. AGI
a. See:bit load
b. The act or process of placing an explosive in a borehole; also, the
explosive so placed. See also:charge
Load-bearing tests may be divided into two types, horizontal and vertical.
Both types require excavation of a test pit into the region that is being
investigated. This test pit must be excavated with a minimum of blasting,
with particular attention to the bearing surfaces to avoid disturbance of
the foundation rock. Load-bearing tests are being used to an increasing
extent as a source of information for the design of heavily loaded surface
structures and have supplanted seismic tests where the foundation rock is
highly shattered. Syn:horizontal load-bearing test
A wall carrying any load put upon it together with its own weight and the
wind load. Hammond
A lever that pulls two grabhooks together, and holds them by locking over
center. Nichols, 1
Consists essentially of a hollow steel cylinder capped top and bottom by a
steel plate. Strain gages are cemented on the inner wall of the cylinder
in such a way that, as the cylinder is compressed, the strain gages will
be distorted, with a resultant change in resistance. This instrument is
designed for measuring the load transferred from the hanging wall onto
props or other units used for support. Issacson