Coal containing slaty material in its composition. Korson
See:bone
Undressed or untreated lead ore. Nelson
Som. A box holding 6 to 8 hundredweight of coal in which waste rock is
sent to the surface. Fay
Clay deposited in thin, leaflike laminae. Syn:leaf clay
Lumps of mica in which laminae have not been separated into thin sheets.
Pryor, 3
Crystals of crude mica obtained from a mine in various shapes and sizes.
Also called book. Syn:mine-run mica
The alternation of ore with gangue, usually quartz, in parallel sheets.
CF:ribbon
a. A spar or beam projecting out over the drill floor from the tripod or
derrick, by means of which heavy drill tools and equipment may be moved
and safely handled. Long
b. A long, adjustable steel arm on a drill jumbo on which drifter or other
types of pneumatic drills are mounted. Long
c. A cantilevered or overhanging member or structure that supports or
contains the component parts of a conveyor. It may be fixed, hinged, or
pivoted.
d. A pipe fixed across the last supports in a tunnel face to anchor the
tail sheave of a scraper loader installation. Nelson
e. In a revolving shovel, a beam hinged to the deck front, supported by
cables. Nichols, 1
f. Any beam attached to lifting or excavating equipment.
See also:dragline
g. Any heavy beam that is hinged at one end and carries a weight-lifting
device at the other. Nichols, 1
Any type of conveyor mounted on a boom.
a. The ditch from the dam used in booming.
b. A slight channel cut down a declivity into which is let a sudden head
of water to cut to the bedrock and prospect from the apex of any
underlying lode.
a. In placer mining, an automatic gate in a dam that holds the water until
the reservoir is filled, then opens automatically and allows the escape of
such a volume of water that the soil and upper gravel of the placer are
washed away. When the reservoir is emptied the gate closes and the
operation is repeated. On a smaller scale it may be used to furnish water
periodically for sluicing. Syn:automatic dam; flop gate. Hess
b. A sonar transducer, used in the exploration of bottom substrata.
Hy
c. Originally, an oilfield worker who migrated from one boom field to
another; now, commonly, a member of a drill crew who works one job a short
time, quits, and moves on to another locality to seek employment. Also
called drifter. Long
d. A combination ratchet and lever device used to tighten a chain or line
about a loaded truck or wagon to hold the load in place. Long
This free-instrument-type device can be dropped over the side of a moving
ship, where it will sink rapidly to the ocean floor, take a core of
sediment, release ballast, and automatically return to the surface for
retrieval. Hunt
The accumulation and sudden discharge of a quantity of water (in placer
mining, where water is scarce). In California, the contrivances for
collecting and discharging water are termed "self-shooters," an idea
suggested by the sudden and violent manner in which the water makes its
escape. In booming, snowmelt or water from small or ephemeral streams is
collected behind a dam with a discharge gate. Placer ore is placed below
the dam and when the water is released, the ore is washed through sluice
boxes, ground sluices, etc., in one large surge. The dam discharge gate is
closed to again begin collecting water for the next cycle. Syn:hushing
In bituminous coal mining, one who manipulates the controls of a loading
boom (conveyor) to regulate the height of the loading end of a boom, thus
controlling the flow of coal from shaking screens or picking tables into
railroad cars at the tipple. Also called boom operator; loader headman.
DOT
See:bort
a. Eng. Lead ore that separates easily from its matrix and does not have
to be buddled, Durham, Yorkshire, and Derbyshire. Hooson defines it as
veinstuff and ore mixed. Syn:booze; bowse. Arkell
b. Derb. Gangue rock mixed with ore. See also:bouse
An explosive of special character used in small quantities to improve the
performance of another explosive, the latter forming the major portion of
the charge. Nelson
Any type of powered conveyor used to regain elevation lost in gravity
roller or wheel conveyor lines. Syn:humper
An auxiliary drive at an intermediate point along a conveyor.