a. A metal disk charged with an abrasive, used for the first work in
grinding gems. Standard, 2
b. A set of roughing rolls. Standard, 2
The rolls of a train that first receive the pile, ingot, bloom, or billet,
and partly form it into the final shape. Also called breaking-down or
roughing-down rolls. Fay
The ordinary tool used by machinists for removing the outer skin and
generally for heavy cuts on cast iron, wrought iron, and steel.
Crispin
a. See:rough diamond
b. A gemstone that has not yet been polished or cut.
Corn. A quarry term to designate a direction along which there is no
natural cleavage in a rock. See also:cleaving way; quartering way.
a. A planned pattern of drill holes or series of shots intended to be
fired either simultaneously or with delay periods between shots; also, the
muck pile obtained when the round is blasted.
b. A round generally consists of cut holes, easers, and trimmers.
See also:drill-hole pattern; shot firing in rounds. Nelson
c. The holes drilled for blast, the advance from a blast, or the ore, or
rock from a single blast. Ballard
d. A blast including a succession of delay shots. Nichols, 1
e. In the operation of a blast furnace, one complete charge of ore, coke,
and limestone. Henderson
See:circuits
A bullnose bit; also, any bit the cutting face of which is rounded, such
as a single- or double-round nose bit. Long
A mass concrete dam constructed of parallel buttresses thickened at the
upstream end until they conjoin. See also:multiple-arch dam
Hammond
A hook that has a smooth inner surface and will slide along a chain.
Nichols, 1
A forming or swaging tool having a semicylindrical groove; a blacksmith's
swage or collar tool. Standard, 2
See:beehive kiln
a. A rounded rock fragment of any size larger than a sand grain; a group
name for pebbles, cobbles, or boulders -- any or all of these.
Stokes
b. A diamond crystal with an arched facet. Hess
c. A term proposed by Fernald (1929) for any naturally rounded rock
fragment of any size larger than a sand grain (diameter greater than 2
mm), such as a boulder, cobble, pebble, or granule.
See also:cobblestone
A rope composed of a number of strands, generally six in number, twisted
together or laid to form the rope around a core of hemp, sisal, or
manilla, or, in a wire-cored rope, around a central strand composed of
individual wires. Sinclair, 5
The process of pulling the drill string from a borehole, performing an
operation on the string (such as changing a bit, emptying the core barrel,
etc.), and then rerunning the drill string into the borehole.
See also:trip
a. Corn. Coarse, undressed tin ore; refuse from stamping mills.
Arkell
b. N. Staff. A seam or bed of coal.
c. A line of points in a lattice. See:lattice
An orthorhombic mineral, Ca2 Mn2 B4 O7 (OH)
6 ; forms a series with fedorovskite; forms light brown laths; at
Franklin, NJ.
An amorphous mineral, Y4 FeSi4 O14 F2 (?) ;
massive; dark-green where fresh; becomes brick red on alteration.
In a large blast, setting off the row of holes nearest the quarry face
first, and other rows behind it in succession. Nichols, 1
A nonpermitted gelatinous explosive; medium strength, high density, and
good water resistance. Used in tunneling in nongassy mines in rocks of
medium hardness. Nelson
Solution overflowed from first ion-exchange column in a series that is
receiving and stripping pregnant uranium liquor; contains some uranyl.
Pryor, 3