In the quarry industry, one who loads broken rock into a large box, placed
on a small truck running on a narrow gauge track, to be hoisted out of the
quarry pit. Syn:grouter; rock loader. DOT
See:scraper
An open wooden channel or flume for conveying placer sand. The gold or
heavy minerals settle at the bottom. The method is cleaner and requires
less water than ground sluicing. Nelson
See:bell tap
Use of rectangular close frame for lining shafts or drives.
See also:plank timbering
A network of intersecting blades or plates of limonite or other iron
oxide, deposited in cavities and along fracture planes from which sulfides
have been dissolved by processes associated with the oxidation and
leaching of sulfide ores, esp. porphyry copper deposits. AGI
Local name for probertite. English
Staff. A bluish iron ore. See also:boilum
A 5% solution of nitric acid in absolute ethyl or methyl alcohol, used for
the general etching of normal carbon steels. Syn:nital
Bone phosphate of lime. AGI
Letter name specifying the dimensions of bits, core barrels, and drill
rods in the B-size and Q-group wireline diamond drilling system having a
core diameter of 36.5 mm and a hole diameter of 60 mm. Cumming, 2
A platform or landing at the top of a shaft. The upper brace is the
platform built in the headgear above the shaft collar. Nelson
A cross handle attached at the top of a column of drill rods by means of
which the rods and attached bit are turned after each drop in
chop-and-wash operations while sinking a borehole through overburden. Also
called brace key. Long
The shorter lateral axis in the crystals of the orthorhombic, monoclinic,
and triclinic systems. Webster 3rd
a. A pinacoid parallel to the vertical axis and the brachydiagonal.
Standard, 2
b. The pinacoid 010 intersecting the brachy-axis in orthorhombic and
triclinic systems (obsolete). CF:pinacoid
In crystallography, comparatively short. Standard, 2
a. Diagonal or horizontal members used to prevent swaying of structures,
i.e., conveyor-supporting structures.
b. Eng. See also:lacing
A monoclinic mineral, Pb2 (Mn,Fe)(VO4 )2 .H2 O.
A process by which fine ores are moistened with water to which a binding
medium is added, and the wet mass, without any heating, is rotated in a
drum until it forms into spherical lumps of varying size. The moisture is
then dried out by evaporation, and the product remains in the form of
hard, very porous balls of ore, which are of great reducibility as
compared with sintered ore or briquettes. Osborne
A platform over a shaft entrance. Standard, 2
Water in which salinity values range from approx. 0.50 to 17.00 parts per
thousand. Hy