a. The outcrop of a horizontal layer of resistant rock, such as sandstone,
at the edge of a plateau, butte, or mesa; the cliff or ledge so formed.
b. The bedrock rising to form the boundary of a placer deposit.
Prospecting for carnotite on the Colorado Plateau, where the favorable
beds, more or less flat-lying, crop out in cliffs or rims.
A texture in ores where the metasome forms a narrow rim around grains of
the host mineral.
Prospecting a canyon rim with a Geiger counter. Ballard
a. A term used in the Southwestern United States for a recess or hollow in
a cliff or a reentrant in the borders of a mesa or plateau. Also called a
cove.
b. A term used in the Southwestern United States for a small, secluded
valley.
c. A bend in a stream.--Etymol: Spanish rincon, inside corner, nook.
a. A complete circle of tubbing plates around a circular shaft.
Syn:tunnel lining
b. Troughs placed in shafts to catch the falling water, and so arranged as
to convey it to a certain point.
c. See also:wedging crib
d. S. Staff. A circular piece of wrought iron, about 8 in (20 cm) deep,
placed on the top of a skip of coal to increase its capacity.
One composed of a series of straight, unbonded rows, one brick wide.
a. An old name for bituminous coal. Tomkeieff
b. Bituminous coal as opposed to stone coal or anthracite. Arkell
An association of ring dikes and cone sheets. AGI
a. A type of hammermill with a high-speed horizontal shaft upon which a
series of steel rings are swung. ACSG, 2
b. Impact mill, beater mill, or hammermill, in which the beaters are
loosely swinging rings. Pryor, 3
c. See also:hammermill
Holes in a ring around one central hole used to carry a cavity forward,
usually six. Pryor, 3
A subcircular to circular dike with steep dip. Ring dikes may be many
kilometers long, and hundreds or thousands of meters thick. Their radius
is generally from 1 to 20 km. Although some ring dikes may form a nearly
complete circle, more commonly they encompass 1/4 to 3/4 of a circle or
ellipse. They are commonly associated with alkalic igneous complexes and
carbonatites, so are probably related to deep shock effects or to cauldron
subsidence. Ring dikes are commonly associated with cone sheets to form a
ring complex. Syn:ring-fracture intrusion
A diamond bit in the face of which has been gouged a circular groove
deeper than, and at least as wide as, the diameter of one row of the inset
diamonds. Long
A crowbar. Fay
A steep ring-shaped fault, complete or incomplete. It is associated with
cauldron subsidence.
See:ring dike
The group of boreholes radially drilled from a common-center setup.
See also:horadiam; radial drilling. Long
An inductive method in which the primary coil and the measuring coil are
concentric. Schieferdecker
The audible or ultrasonic tone produced in a mechanical part by shock, and
having the natural frequency or frequencies of the part. The quality,
amplitude, or decay rate of the tone may sometimes be used to indicate
quality or soundness. ASM, 1
Closed loop of piping, including provision for entry of material,
circulation boost and controlled withdrawal points; used for circulating
solids such as pulverized fuel, or fluids such as lime slurry,
continuously without settlement or chokeup. Pryor, 3
Fragments of gangue covered with deposits of other minerals.
See also:cockade ore