Graphic representation of cumulative curve results of screen analysis, in
which the cumulative percentage of weight is plotted against the screen
aperture, usually both to logarithmic scale. Pryor, 3
The curve obtained from the results of a float and sink analysis by
plotting the cumulative yield of sinks at each specific gravity against
the mean ash of the total sinks at that specific gravity. BS, 5
Said of the texture of a porphyritic igneous rock in which the
phenocrysts, not necessarily of the same mineral, are clustered in
irregular groups; also said of a rock exhibiting such texture.
Syn:glomeroporphyritic
a. Scot. The spaces from which coal has been worked out, partly filled
with dirt and rubbish between the packs. See also:openset; goaf.
Fay
b. Aust. The passage under a roadway into which an endless rope passes out
of the way at the end of its track. Also called conduct. A variation of
conduit. Fay
c. Any small passageway made to improve ventilation or facilitate movement
of materials. It is generally made through a pack or along the rib side of
a longwall face. See also:airhole
A machine for charging a shaft furnace, consisting of an iron hopper with
a large central opening, which is closed by a cone or bell pulled up into
it from below. In the annular space around this cone, the ore, fuel, etc.,
are placed, then the cone is lowered to drop the materials into the
furnace, after which it is again raised to close the hole.
Syn:bell and hopper; closed top. Fay
a. A small bone-ash cup used in gold or silver assaying with lead.
b. The hearth of a small furnace used in refining metals.
a. The process of assaying for precious metals with a cupel.
b. Oxidation of molten lead containing gold and silver to produce lead
oxide, thereby separating the precious metals from the base metal.
One who refines gold and silver in a type of reverberatory furnace known
as a cupel. DOT
A colorless crystalline salt, C6 H5 N(NO)ONH4 , that
is a precipitant for copper and iron from solutions and is also used in
the analysis of other metals, esp. of the uranium group. Used for
separating iron and copper from other metals. Precipitates iron
quantitatively from strongly acid solutions.
a. A cylindrical vertical furnace for melting metal, esp. gray iron, by
having the charge come in contact with the hot fuel, usually metallurgical
coke. ASM, 1
b. A dome-shaped projection of the igneous rock of a batholith. Many
stocks are cupolas on batholiths. CF:roof pendant
A shaft furnace used in melting pig iron (with or without iron or steel
scrap) for iron castings. Metal, coke, and flux (if used) are charged at
the top, and air is blown in near the bottom. CTD
See:lampadite
See:copper sulfide
Yielding or containing copper. Standard, 2
See:chalcopyrite
An isometric mineral, Cu2 O ; red (crimson, scarlet, vermillion,
brownish-red); sp gr, 6.1; in oxidized parts of copper veins; an important
source of copper. Also called ruby copper; ruby copper ore.
Syn:red copper ore; red copper oxide; red glassy copper ore;
red oxide of copper; octahedral copper; cuprous oxide; copper suboxide.
See also:chalcotrichite; plush copper ore.
A variety of apatite from Chile containing copper. Standard, 2
A former name for auricupride. Syn:gold cupride
A mixture of cuprite and calcite(?).
A triclinic mineral, CuFe4 (SO4 )6 (OH)2 .20H
2 O ; copiapite group.
A former name for mottramite.