The process of lining a shaft with bricks or masonry; the lining itself.
CTD
A journey set or train of tubs, trams, or trucks, or a self-acting
incline, in a coal mine. CTD
A person working on an endless chain haulage. CTD
Eng. A small railway truck for transporting constructive materials.
Standard, 2
A monoclinic mineral, Ca2 B14 O23 .8H2 O ;
transparent to translucent; occurs as pellets embedded in a matrix of
sassolite and clay within colemanite-veined basalt at Death Valley, CA;
also as minute lozenge-shaped plates aggregated into masses with calcite
in veins in sandstone at Sasso Pisano, Tuscany, Italy.
CF:strontioginorite
A shallow mine, the hoisting from which is done by a gin. Fay
The circular path that a gin horse travels. Syn:gin ring
Standard, 2; Fay
See:gin race
The cylinder of a gin or winch. Standard, 2
See:magnesite
See:gypsum plate; accessory plate.
a. A cagelike mine car esp. adapted for inclines, having the frame higher
at one end than at the other. Standard, 2
b. A mechanical appliance for receiving and tripping a car of ore, etc.,
when it arrives at the surface. Fay
c. A multiple-deck skip. Fay
a. A name applied to many gemstones with a girasol effect, e.g.,
moonstone; specif. a translucent variety of "fire opal" with reddish
reflections in bright light and a faint bluish-white floating light
emanating from the center of the stone.
b. adj. Said of any gem variety, e.g., sapphire, chrysoberyl, that
exhibits a billowy, gleaming round or elongated area of light that
"floats" or moves about as the stone is turned or as the light source is
moved.
c. A name for glass spheres used in the manufacture of imitation pearls.
a. A thin sandstone stratum. Standard, 2
b. Flattened lenticles or nodules of any hard stone in softer beds.
Sometimes extended also to beds. Arkell
c. In stratigraphy: (1) a thin stratum, particularly said of sandstone or
coal, esp. when exposed in a shaft or borehole or (2) flattened lenticles
or nodules of any hard stone in softer beds.
d. In gemology, the line that encompasses a cut gem parallel to the
horizon; or that determines the greatest horizontal expansion of the
stone.
e. In structural petrology, on an equal-area projection, a belt or
concentration of points representing orientations of fabric elements. If
this belt coincides approx. with a great circle of the projection, it is
referred to as a great-circle girdle. If the belt of concentration
coincides approx. with a small circle of the projection, it is called a
small-circle or "cleft girdle"
In this process, fluorspar, soda ash, carbon, lime, and mill scale were
thrown on to the bottom of a hot ladle, and thus sintered. On tapping the
steel from the open hearth furnace into the ladle, the resulting boil
removed part of the phosphorus. Osborne
a. A brace member running horizontally between the legs of a drill tripod
or derrick. Long
b. In square-set timbering, a horizontal brace running parallel to the
drift. Long
See:Geographic Information System
An artificial-current conductive direct-current method of measuring ground
resistivity which avoids polarization by continually reversing the current
with a set of commutators. AGI
A monoclinic mineral, Ca2 Al4 Si4 O16 .9H (sub
2) O ; zeolite group; pseudotetragonal; vitreous, transparent to
translucent; in cavities in leucitic tephrites and related lavas; also
zeolite zones in basaltic lavas where it is associated with chabazite,
thomsonite, and phillipsite. Also spelled gismondite.
A cavity lined with refractory material used in metal working to enclose
large ingots, in order to preserve them at a high temperature, and thus
avoid the necessity of reheating. Fay
a. Of or relating to the presence and activities of ice or glaciers, as
glacial erosion. AGI
b. Pertaining to distinctive features and materials produced by or derived
from glaciers and ice sheets, as glacial lakes. AGI
c. Pertaining to an ice age or region of glaciation. AGI
d. Suggestive of the extremely slow movement of glaciers. AGI
e. Used loosely as descriptive or suggestive of ice, or of below-freezing
temperature. AGI