Removal of gold from pregnant cyanide solution by deoxygenation, followed
by precipitation on zinc dust, followed by filtration to recover the
resultant auriferous gold slimes. Pryor, 3
A type of plate and frame pressure filter.
a. High-purity zinc dust used to precipitate gold and silver in the
cyanide process.
b. See:whitlockite
See:bloomery
See:tasmanite
A monoclinic mineral, Ca3 Mg(SiO4 )2 ; colorless to
pale green.
An isolated, nearly level landmass standing distinctly above the
surrounding country, bounded by abrupt or steeply sloping erosion scarps,
and capped by a layer of resistant, nearly horizontal rock (often lava).
CF:plateau
See:natural ore
See:butte
Fine-quality tourmaline from a pegmatite near Mesa Grande, San Diego
County, CA.
a. In ventilation, a series of airways that form a closed loop.
Roberts, 1
b. The screen number of the finest screen of a specified standard screen
scale.
c. The number of apertures per unit area of a screen (sieve).
The dimension or dimensions of the aperture in a screen deck, usually with
a qualification as to the shape of aperture; e.g., round-hole,
square-mesh, and long-slot. BS, 5
That part of a material passing a specified mesh screen and retained by
some stated finer mesh. Henderson
The particle size at which substantially all of the valuable minerals are
detached from the gangue minerals. Fuerstenau
The designation of size of an abrasive grain, derived from the openings
per linear inch in the control sieving screen. Syn:grit number
ACSG, 2
Optimum particle size resulting from a specific grinding operation, stated
in terms of percentage of material passing (or alternatively being
retained on) a given size screen. The mesh of grind is the liberation mesh
decided on as correct for commercial treatment of the material. Abbrev.,
m.o.g. Pryor, 3
A structure resembling network or latticework that is found in certain
alteration products of minerals. Also called net structure; lattice
structure. Standard, 2; Fay
a. A texture resembling a network, caused by the alteration of certain
minerals; e.g., the serpentinization of olivine.
Syn:reticulate texture
b. An interlacing network of microveinlets of fibrous serpentine enclosing
cores of more weakly birefringent cryptocrystalline serpentine in which
relict remnants of olivine may survive. Also called net structure; lattice
structure.
A prefix meaning middle. CF:cata-; meta-. AGI
Applied to igneous rocks that are intermediate between leucocratic and
melanocratic rocks; they contain 30% to 60% dark minerals.
CF:melanocratic; leucocratic. CTD
Said of the texture of a rock intermediate between microcrystalline and
macrocrystalline; also, said of a rock with such a texture. AGI