Casts of short grooves (up to 5 cm) widest and deepest in middle and
fading out at both ends; presumably formed by objects grazing against
bottom and rebounding. See also:impact cast
Pettijohn, 1
Corn. An area taken up for tin mining; a tin bound. Standard, 2
a. A line between areas of the Earth's surface occupied by rocks or
formations of different type and age; esp. used in connection with
geologic mapping; also, a line between two formations or cartographic
units on a geologic map.
b. The limit, border, or termination of a coal or mineral take; a line
along which workings must stop in the vicinity of a fault or old
waterlogged workings. Also called march. Nelson
A major fault with a considerable displacement. A number of collieries and
coalfields are limited along one side by such a fault. Nelson
Films of one constituent of an alloy surrounding the crystals of another
constituent. CTD
A map created for the purpose of delineating a boundary line and the
adjacent territory. AGI
A pillar left in mines between adjoining properties.
A hard, lenticular, cemented mass of sand and gravel occurring in the
region of the water table; it is often mistaken for bedrock. AGI
Pressure gage, made from elliptical curved tube, which straightens
somewhat under pressure, and is made to move a measuring needle over a
dial. Pryor, 3
An orthorhombic mineral, 4[PbCuSbS3 ] ; shows wheel-shaped twin
crystals; a source of lead, copper, and antimony. Syn:wheel ore;
cogwheel ore; endellinite; endellionite; berthonite.
N. of Eng. Ore mixed with veinstone; second-class ore that must undergo
further preparation before going to the smelter. See also:boose
N. of Eng. The place where bouse is deposited outside a mine, ready to be
dressed or prepared for the smelter.
Derb. A method of measuring lead ore. Nelson
A peculiar green and very pure glass, found as rolled pebbles. Also called
bottle stone; pseudochrysolite--the latter from its resemblance to
olivine. It is not solely a rock, as it may be prehistoric slag or glass.
See also:moldavite
a. Scot. A road by which the miners can reach the surface.
b. A passage around a shaft at a landing.
c. A traveling road from one seam to another.
a. Scot. A mass of roof consisting of stone or shale.
b. Scot. A projecting stone in a shaft or underground road.
a. A hard, compact, greenish-white to yellowish-green serpentine once
thought to be nephrite jade; translucent; massive, fine-grained; consists
of a dense feltlike aggregate of colorless antigorite fibers with patches
of magnesite, flakes of talc, and grains of chromite.
Syn:bowenite jade
b. N.Z. Serpentine rock (serpentinite). Syn:tangiwai; tangiwaite;
tangawaite.
See:bowenite
See:reaction series
a. S. Staff. A small wooden box in which iron ore is hauled underground.
Syn:hudge
b. Aust. An iron bucket used for raising rock, etc., while sinking.
Syn:hudge
the coal beneath.
d. Bucket; kibble; hoppit, as used in sinking. Mason
e. A large iron barrel used for men's tools and debris when sinking a
shaft. CTD
f. The noise made by the escape of gas under pressure.
a. The bucket or body of a carrying scraper. Nichols, 1
b. The moldboard or blade of a dozer. Nichols, 1
c. Stationary part of a Symons crusher, which surrounds the cone (the
grating member). Pryor, 3
d. See:spider