An apparatus, and the building containing it, in which rock is crushed by
descending pestles (stamps), operated by water power or steam power.
Amalgamation is usually combined with crushing when gold or silver is the
metal sought, but copper, tin, and other ores are stamped to prepare them
for dressing. The technique is obsolete. Syn:stamp battery
The heavy, chilled-iron casting, attached to the lower end of a stamp
piston, which does the actual crushing of rock in a stamp mill. It drops
on a round steel block called a die. Weed, 2
Person who attends or operates a stamp or stamp battery. Fay
A term used in the Lake Superior region for rock containing disseminated
native copper.
a. A vertical prop or strut. Zern
b. A support or post of iron or wood. Crispin
a. Two or more lengths of drill rod or casing coupled together and handled
as a unit length as they are taken from a borehole and set upright in a
drill tripod or derrick. See also:double; forble; treble. Long
b. A drill floor. Long
c. To allow a cement slurry to remain undisturbed in a borehole until it
hardens or sets. Long
d. To set a string of casing in a borehole. Long
a. Reservoir or storage capacity, said of water and of mine cars.
Mason
b. See:sump
c. The capacity of a sump or lodge. BS, 10
d. See:lodge
A length of roadway provided near a shaft bottom to stock loaded mine cars
and/or empty cars: (1) during peak hours when the coal reaches the pit
bottom at a faster rate than the shaft can wind; and (2) during emergency
periods, such as plant breakdown at the surface, thus permitting coal
production to continue. In general, the standage room accommodates 45-min
to 1-h winding capacity. See also:bunker conveyor; bunkering capacity.
Nelson
In mine ventilation, the standard density of air for mine ventilation work
is considered to be 0.075 lb/ft3 (1.2014 kg/m3 ). This
is based upon the weight of 1 ft3 (0.028 m3 ) of dry air
at 70 degrees F (21.1 degrees C) at a sea-level pressure of 29.9 in (759
mm) of mercury.
A bit the size and design of which are as specified in standards accepted
by the drilling industry. Long
In refrigeration, an evaporation temperature of 5 degrees F (-15 degrees
C), condensing temperature of 86 degrees F (30 degrees C), liquid
temperature before the expansion valve of 77 degrees F (25 degrees C), and
suction temperature 14 degrees F (-10 degrees C). Strock, 2
Practically any brand of 96%, or higher, fineness.
See:standard bit
Electrode used as a standard in measurements of electrode potential,
because its potential is constant and reproducible; used for pH
measurements, polarographic analysis, etc.
A method developed for testing coal dust to obtain the limits of
explosibility. Rice, 2
For many years, the Greenburg-Smith impinger was the routine dust sampling
instrument in this country. It is still relied upon as a standard, but
because of its size and weight, is little used underground today.
Hartman, 1
See:regular lay
Concrete mixed in the proportions of 1 part cement, 2 parts sand, and 4
parts coarse material. See also:aggregate; cement. Nelson
An adequate amount of ventilation to dilute and render harmless all
noxious and flammable gases to such an extent that all roads and workings
in a mine shall be kept in a fit state for working or passing therein.
Mason
a. A parallel of latitude that is selected as a standard axis on which to
base a grid system; specif. one of a set of parallels of latitude (other
than the base line) of the U.S. Public Land Survey system, passing through
a selected township corner on a principal meridian, and on which standard
township, section, and quarter-section corners are established. Standard
parallels are usually at intervals of 24 miles north or south of the base
line, and they are used to limit the convergence of range lines that
intersect them from the south so that nominally square sections and
townships can be laid out. Syn:correction line
b. A parallel of latitude that is used as a control line in the
computation of a map projection; e.g., the parallel of a normal-aspect
conical projection along which the principal scale is preserved.
AGI
c. A parallel of latitude on a map or chart along which the scale is as
stated for that map or chart. AGI