An orthorhombic mineral, MgAlBO4 ; structurally analogous to
olivines; yellow.
a. To excavate or drive a shaft or slope.
b. The depression in a shaft made by a center blast. Standard, 2
c. A water lodgment. See also:sump
d. To put standpipe or casing down through overburden by rotation or by
driving, chopping, or washing-- these methods being employed singly or in
combination. Long
e. To drill or put down a borehole. Long
f. A depression in the land surface, esp. one having a central playa or
saline lake with no outlet; a hollow in a limestone region communicating
with a cavern or subterranean passage so that waters running into it
disappear. Also called sinkhole; swallow hole. Webster 3rd
g. Lanc. Natural cavity found in iron mines.
a. A rock drill for drilling blasting holes in a sinking shaft.
Nelson
b. A special movable pump used in shaft sinking.
c. See:sinker bar
d. A person who sinks mine shafts and puts in supporting timber or
concrete. Webster 3rd
a. A heavy rod used to increase the snatching effect of the sliding jars
in rope drilling. BS, 9
b. A short bar or stem placed above the drill jars to give force to the
upward jar in well drilling with cable tools. Webster 3rd
a. A one-person drill that can be held in the hand but is frequently
mounted. This drill has found wide application in sinking shafts and is
made in several sizes, each suited for a particular kind of work. Also
called plugger drill. Lewis
b. A rock drill of the jackhammer type commonly used in shaft sinkings.
Also called sinker. Webster 3rd
c. A hand-held compressed-air rock drill used in boring down holes such as
in shaft sinking. Pryor, 3
Processes that separate particles of different sizes or composition on the
basis of specific gravity. When ore or coal particles are introduced into
a liquid (or into a medium: a solid suspension), those having a specific
gravity higher than that of the liquid will sink, while those that are
lighter than the liquid will float. Chem. Eng.
A circular depression in a karst area. Its drainage is subterranean, its
size is measured in meters or tens of meters, and it is commonly funnel
shaped. Syn:doline; sink; leach hole. Partial syn: collapse sink.
AGI
a. The process by which a shaft is driven. BCI
b. Extending excavations downward at or near the vertical plane.
See also:raising; shaft sinking. Nelson
A forge in which wrought-iron scrap or refined pig iron is partly melted
or welded together by means of a charcoal fire and a blast.
See:deadhead
Shaft sinking in rock usually comprises the following cycle: drilling a
round of holes, blasting, removing the broken rock, trimming the shaft to
form, placing the sets or concrete in position, and then preparing to
drill the next round. Lewis
A large bucket for raising the stones, etc., from a shaft being sunk.
Sometimes called bowk; hoppett. Peel
A lift (pump) of small size with esp. heavy castings to resist the force
of blasting; used in shaft sinking. A sinking pump, which is also
sometimes called a sinker. Standard, 2; Fay
In a shaft, a sinking plant consists of the headframe, hoisting equipment,
air-compressor for drills, concrete-mixing equipment, and suitable pumps.
It may be temporary or permanent. Lewis
A scaffold or staging designed for use during shaft sinking, particularly
during lining operations. Nelson
A long, narrow pump designed for keeping a shaft dry during sinking
operations. It is usually large enough to deal with 1,000 gal/min (3,780
L/min) from the greatest depth at which water will be encountered. A
sinking pump must be slung from the surface and be fairly easy to raise
and lower when shot firing takes place at the shaft bottom. Most are of
the electrically driven centrifugal type and allow for additional stages
to be fitted as the shaft depth increases. It may be suspended by a
single-drum, worm-driven, capstan engine with a very slow speed.
See also:borehole pump; water barrel. Nelson
Fractions with a defined upper limit of specific gravity and so described,
e.g., sinks 1.60 specific gravity. BS, 5
A red or brownish-red variety of quartz containing inclusions of hematite.
Also spelled sinopal; sinopel.
a. A chemical sedimentary rock deposited as a hard incrustation on rocks
or on the ground by precipitation from hot or cold mineral waters of
springs, lakes, or streams; specif. siliceous sinter and calcareous sinter
(travertine). The term is indefinite and should be modified by the proper
compositional adj., although when used alone it usually signifies
siliceous sinter. Etymol: German sinter, cinder. CF:tufa
b. A ceramic material or mixture fired to less than complete fusion,
resulting in a coherent mass when cooled.
c. A process for agglomerating ore concentrate in which partial reduction
of minerals may take place and some impurities be expelled prior to
subsequent smelting and refining.
d. To heat a mass of fine particles for a prolonged time below the melting
point, usually to cause agglomeration. ASM, 1
e. A process commonly used in making diamond bits, whereby powdered metal
is compacted in a diamond-set mold or die, and the temperature is raised
to a point just below melting, thus fusing the entire mass together. Also
called sintered. Long