A clay suitable for manufacture of stoneware (ceramic ware fired to a
hard, dense condition and with an absorption of less than 5%); used for
items such as crocks, jugs, and jars. It possesses good plasticity,
fusible minerals, and a long firing range. AGI
See:diamond content
a. All underground work involving the excavation, loading, or handling of
rock or dirt, such as ripping, dinting, tunneling, packing, etc. In thin
coal seams, stonework is a major cost item. See also:dead work
Nelson
b. The process of working in stone; the shaping, preparation, or setting
of stone. Webster 3rd
See:yellow ocher
Eng. Compressed clays with sandstone layers interspersed, Midlands.
Arkell
The last stump or corner block of coal left when extracting pillars by
means of lifts, in pillar methods of working. Nelson
a. The point where a miner stops digging downward to work outward.
Hess
b. The assembly carrying the return rollers and brackets for connecting
standard sections together in belt conveyors. Nelson
Eng. Applied to a vein cut vertically for some distance.
A supporting pillar mine. Webster 3rd
See:bord-and-pillar
A miner in pillar methods of working employed in pillar robbing; a
practice now obsolete. Nelson
A passageway, the height of which requires a person to stoop or crouch in
traversing it. AGI
a. Any cleat or beam to check the descent of a cage, car, pump, pump rods,
etc.
b. In mining, a variation of stope.
A simple arrangement of two stout timbers, sliding on pivots, one of which
can be placed across the track rail and held in position by the other
block. They are often used on haulage landings to prevent trams running
down the incline uncontrolled. Syn:nubber
a. An excavation from which ore has been removed in a series of steps. A
variation of step. Usually applied to highly inclined or vertical veins.
Frequently used incorrectly as a syn. for room, which is a wide-working
place in a flat mine. Standard, 2
b. To excavate ore in a vein by driving horizontally upon it a series of
workings, one immediately over the other, or vice versa. Each horizontal
working is called a stope because when a number of them are in progress,
each working face under attack assumes the shape of a flight of stairs.
When the first stope is begun at a lower corner of the body of ore to be
removed, and, after it has advanced a convenient distance, the next is
commenced above it. This is called overhand stoping. When the first stope
begins at an upper corner, and the succeeding ones are below it, it is
called underhand stoping. The term stoping is loosely applied to any
subterranean extraction of ore except that which is incidentally performed
in sinking shafts, driving levels, etc., for the purpose of opening the
mine.
c. Commonly applied to the extraction of ore, but does not include the ore
removed in sinking shafts and in driving levels, drifts, and other
development openings. Lewis
d. The working above and below a level where the mass of the orebody is
broken. A stope is the very antithesis of a shaft, tunnel, drift, winze,
or other similar excavation in a mine. Ricketts
e. Any excavation in a mine, other than development workings, made for the
purpose of extracting ore. The outlines of the orebody determine the
outlines of the stope. The term is also applied to breaking ground by
drilling and blasting or other methods. See also:caving
f. A body of mineral left by running drifts about it. Standard, 2
A timber staging on the floor of a stope for setting a rock drill. The
stage is tilted to enable the bottom holes being drilled in the same
inclined direction. Nelson
The driving of subsidiary openings designed to prepare blocks of ore for
actual extraction by stoping.
In metal mining, one who operates compressed air, percussion-type rock
drill in a stope (an underground opening from which ore is extracted in a
series of steps). Also called stoper. DOT
Broken mullock or rock or the broken low-grade portion of a lode or vein
used to fill stopes on abandonment. Nelson
A small portable compressed-air hoist for operating a scraper-loader or
for pulling heavy timbers into position, often used in narrow stopes.
Nelson
See:miner