A long, narrow structural trough that is bounded by normal faults; a
graben of regional extent. CF:rift valley
a. A valley that has developed along a rift structure.
Syn:fault trough
b. The deep central cleft in the crest of the mid-oceanic ridge.
Syn:midocean rift
a. A system of parallel crustal fractures; a rift structure. AGI
b. In Hawaii, a zone of volcanic features associated with underlying dike
complexes. Syn:volcanic rift zone
a. A drill machine complete with auxiliary and accessory equipment needed
to drill boreholes. Long
b. To assemble and set up a tripod, derrick, and/or drill machine and put
it in order for use. Syn:rig up
c. A general term denoting any machine. More specif., the front or
attachment of a revolving shovel. See also:drilling rig
Nichols, 1
Drill machine and equipment in place at a drill site and ready to start
drilling. Long
One who, with special equipment and tackle, moves and transports heavy
machinery, etc. Crispin
a. Process of setting up a drill and its auxiliary equipment preparatory
to drilling. Syn:setting up
b. The cables or ropes anchoring a drill derrick, mast, or tripod.
See also:guy
c. Sometimes used as a term for derrick, mast, or tripod complete with
anchor, stay ropes, and cables. Long
d. The equipment or gear such as hoists, tackle, winches, chains, or rope
used by riggers in their work.
e. The engineering design, layout, and fabrication of pattern equipment
for producing castings; including a study of the casting solidification
program, feeding and gating, risering, skimmers, and fitting flasks.
ASM, 1
A long, extension-type jack bar or drill column for use underground, on
which a drilling machine can be mounted. Long
In quarrying, a block of stone bounded by three pairs of parallel faces,
all adjacent faces meeting at right angles.
The bank of a stream that is on the right when one looks downstream.
A cutter, all of whose flutes twist away in a clockwise direction when
viewed from either end. ASM, 1
A diamond-drill feed screw that rotates in a clockwise direction.
Long
Rope or strand construction in which wires or strand are laid in a helix
having a right-hand pitch. See also:lay
Wire or fiber rope or cable in which the individual wires or fibers
forming a strand and the strands themselves are both twisted to the right.
Also called right long lay. Long
A fault on which the displacement is such that the side opposite the
observer appears displaced to the right. CF:left-lateral fault
Syn:dextral fault
Wire or fiber rope or cable in which the strands formed from a group of
individual wires or fibers are twisted to the right. Long
A straight line; the shortest distance between two points. Crispin
See:right lang lay
A grant by Act of Congress, to convey water over or across the public
domain, for mining purposes.
Wire or fiber rope or cable in which the wires or fibers in the strand are
twisted to the left and the strands to the right.
Syn:regular-lay right lay
a. N. of Eng. Applied to a vein carrying ore in beds often unproductive.
b. N. of Eng. Rake veins extending approx. east and west.