a. Cornwall stone.
b. Granite in its most kaolinized form, in which the feldspar is
transformed into kaolinite and the rock is so soft that it is readily
broken in the fingers. Arkell
Mine opening over the haulage level through which ore from the stope above
is drawn to waiting trucks as planking is removed. Usually, an opening
between stulls below the shrinkage stope. Pryor, 3
N.Z. A pebble or boulder made from a conglomerate of quartz pebbles
cemented by chalcedony. Jaspilite, quartz, and Chinaman pebbles are found
in many places. Hess
a. York. Shale baked to a hard, white, coarse, porcellaneous substance.
Arkell
b. Porcelain.
a. Partially kaolinized granite containing quartz, kaolin, and sometimes
mica and fluorite. It is harder than china-clay rock and is used as a
glaze in the manufacture of china. Syn:petuntze
AGI
b. A fine-grained, compact carboniferous mudstone or limestone found in
England and Wales. AGI
a. Scot. A gravel free from dirt. See also:shingle
b. That portion of a coal seam stowed away in the goaves to help support
the mine roof.
A tetragonal mineral, Na5 Al3 F14 ; massive;
granular; occurs with cryolite.
a. Small fragment of a diamond, usually thin and tabular in shape.
Long
b. To break small fragments from the surface of a diamond or other
material. Long
c. Small, angular, and generally flat pieces of rock or other materials.
Long
d. An imperfection due to breakage of a small fragment out of an otherwise
regular surface. ASTM
e. A small fragment from a crystal; specif. a diamond chip. AGI
f. A piece of rock to be cut into a thin section for microscopic
examination.
Shallow blasting of ledge rock. Nichols, 1
a. A notch or groove in the face of a tool parallel to the cutting edge,
to break the continuity of the chips. ASM, 1
b. A step formed by an adjustable component clamped to the face of a
cutting tool. ASM, 1
a. When referring to the character of diamond wear, it denotes loss of
diamond due to chips and fragments having been broken away from the body
of the diamond. Long
b. A surface pitted by loss of material in the form of chips. Long
a. Loosening of shallow rock by light blasting or airhammers.
Nichols, 1
b. The process of handsetting diamond fragments in a bit.
Nichols, 1
Crushed angular stone fragments ranging from 1/8 to 1 in (0.32 to 2.54 cm)
in size. See also:aggregate
A regular series of ore chips or rock chips taken either in a continuous
line across an exposure or at uniformly spaced intervals. AGI
a. The taking of small pieces of ore or coal, with a small pick, along a
line or at random, across the width of a face exposure. The samples are
usually taken daily and often confined to exploration. Reasonable care is
taken to chip a weight of material that corresponds to the length of
sample line. See also:bulk sample
b. A variant of channel sampling, in which, owing to extreme hardness of
rock, shape of deposit, or other working difficulty, a true channel sample
cannot be taken. Often used in preliminary prospecting. Pryor, 3
Symmetrical handedness. A mirror or center of symmetry changes the
chirality of asymmetric units. CF:improper
Bat guano.
a. A tool of great variety whose cutting principle is that of the wedge.
Crispin
b. The steel cutting tool used in percussive boring. It ranges from 6 to
12 in (15.2 to 30.5 cm) in length with variously shaped bits to suit the
nature of the ground. The chisel is made to strike a series of blows at
the bottom of a borehole. Water or mud is circulated to convert the
chippings into sludge and to keep the chisel cool. Nelson
a. See:chopping bit
b. A percussive-type, rock-cutting bit having a single, chisel-shaped
cutting edge extending across the diameter and through the center point of
the bit face. Also called chisel-edge bit; chisel-point; Swedish bit.
Long
The dressed edge of a stone, which serves as a guide in cutting the rest.
See:shiver