A turbo distributor that spreads sand evenly around a circular leaching
tank in gold cyanidation. Pryor, 3
A hexagonal mineral, Cu19 Cl4 (NO3 )2 (OH)
32 .2H2 O .
See:butt entry
a. A joint between two abutting members lying approx. in the same plane. A
welded butt joint may contain a variety of grooves. ASM, 1
b. See:butt cleat
a. A corner formed by two coal faces more or less at right angles, such as
the end of a working face; the fast side; any short piece of coal approx.
at right angles to the face; a rib; the rib side. See also:rib
Mason
b. Eng. That portion of a working face of coal, next to be taken down.
Fay
c. The rib of coal exposed at one or both ends of a longwall face, to
enable a cutter loader to commence its run; the coal removed by a cutter
loader. See also:stable; web. Nelson
d. Coal that has been undercut and is ready to be broken. Pryor, 3
a. A globule of metal remaining in an assaying crucible or cupel after
fusion has been completed. ASM, 1
b. That part of a weld that tears out in the destructive testing of
spot-seam or projection-welded specimens. ASM, 1
c. Globule of lead formed during fire assay of gold or silver ore.
Pryor, 3
A small, very delicate balance used for weighing assay buttons.
See:button test
A test designed to determine relative fusibility of frit or powder. So
called because the completed specimens resemble buttons.
In coal mining, a charge placed so that the face or burden is nearly
parallel with the borehole.
The side of the working face of a coalbed in which the joints or cleats
are least pronounced, as distinguished from the face side in which the
joints are most pronounced. Hess
A weld made between two abutting unscarfed ends or edges without
overlapping. Both the pin- and box-thread portions of petroleum drill pipe
generally are butt-welded electrically to upset end tubing to form a
complete section of drill pipe or rod. Long
A tube made by drawing mild steel strip through a bell, so that the strip
is coiled into a tube, the edges being then pressed together and welded.
CTD
Synthetic material, copolymer of butadiene and isobutane. Pryor, 3
One of a set of tests carried out in a gallery at the Safety in Mines
Research Station at Buxton, England. The tests are made to determine the
likelihood or limits at which an explosive will ignite gas or coal dust,
before it can be placed on the official permitted list.
See also:permitted explosive
Letter name specifying the dimensions of bits, core barrels, and drill
rods in the B-size and W-group wireline diamond drilling system having a
core diameter of 42 mm and a hole diameter of 60 mm. Syn:BX
Cumming, 2
Letter name specifying the dimensions of core, core barrels, and casing in
the B-size and X-series wireline diamond drilling system having a core
diameter of 42 mm and a hole diameter of 60 mm. The BX designation for
coring bits has been replaced by the BW designation. Syn:BW
Cumming, 2
See:bank water
a. A short passage used to get by or around a place it is not advisable to
cross; e.g., a mine shaft. Also spelled byepass.
b. To pass to the side of an obstruction in a borehole by deflecting the
hole. Syn:drill by
c. An alternative path, in a duct or pipe, for a fluid to flow from one
point to another, with the direction determined by the opening or closing
of valves or dampers in the main line as well as in the bypass.
Strock, 2
d. An arrangement of screens and chutes, or of piping, allowing material
to be passed around a given part of a flow line. Much used to avoid
feeding fine ore through a relatively coarse crusher, thus reducing load,
wear, and chance of blockage. Pryor, 3
e. A small passage to permit equalization of the pressure on the two sides
of a large valve so that it may be readily opened or closed.
Scot. A pit nearer the outcrop than the engine pit; an air pit.