See:manometer
The science of determining the density of gases and vapors.
Standard, 2
A car or carriage designed for the riding of miners to and from the
workings. The car body has a low center of gravity to avoid the risk of
overturning and is fitted with track brakes and an overspeed clutch. The
train set is arranged to brake from the rear to avoid pileup, and the
brakes are applied immediately on overspeed from a preset velocity.
Nelson
A worker appointed by the mine manager to be in charge of the running of a train of man-riding cars. This worker is the responsible person for
starting and stopping the vehicles, for giving the proper signals, and for
seeing that the safe seating capacity is not exceeded. During the shift
this worker is employed on other duties. Nelson
An orthorhombic mineral, AlAsO4 .2H2 O ; variscite group;
forms a series with scorodite.
The output or work done by a worker in one shift; a basis for assessing
the magnitude of a job to complete. Nelson
An alloy containing 0.35% carbon as maximum, from 0.25% to 1.75%
manganese, 0.10% to 0.30% silicon, 0.01% to 0.25% copper, 0% to 0.40%
molybdenum, and 0% to 0.20% vanadium. Used for bodies and doors of
stripping shovel dippers, which have manganese steel for bail, lip, and
renewable teeth. Lewis
a. The soil or other unconsolidated rock material commonly referred to as
overburden. See:surface
b. A sheath of manganese steel that fits over the iron or steel cone of
the breaking (gyrating) head of a gyratory crusher. Pryor, 3
c. That part of a blast furnace that carries the weight of the stack,
continuing up from the bosh. Pryor, 3
d. See:mantle rock; regolith.
e. The outer zone in a zoned crystal; an overgrowth. AGI
f. The zone of the Earth below the crust and above the core, which is
divided into the upper mantle and the lower mantle, with a transition zone
between. AGI
See:regolith
A flat-lying, bedded deposit; either a sedimentary bed or a replacement
strata-bound orebody. Etymol: Spanish, vein, stratum. CF:bed vein
AGI
The practice of pushing tubs, trams, etc., by hand.
See also:hand tramming
A hand-operated mechanism for adjusting the takeup or movable pulley.
NEMA, 2
manual-type belt-tensioning device
A hand-operated mechanism for adjusting a takeup pulley to vary the
tension in a conveyor belt. The most common types are chain-jack,
sylvester, rack, and screw. NEMA, 1
A system in which the winder is controlled in the conventional manner by
the driver, following the usual bell signals from the onsetter and the
banksman. The system of control ensures that the speed of the winder
follows closely the position of the driver's level, driving or dynamic
braking being applied automatically to the motor as needed to preserve the
chosen speed. See also:automatic cyclic winding
A mixture of gaseous hydrocarbons produced from coal or oil.
See also:gas
a. A mixture of marble dust and plastics.
b. A mixture of powdered stone and plastics.
Fine aggregate produced by crushing rock. AIME, 1
a. A compartment, vertical or inclined, for the accommodation of ladders,
pipes, and timber chutes. The drivage may be a winze or a raise and its
purpose is to give convenient access to a stope. Also called ladderway.
Nelson
b. A passageway for the use of miners only; an airshaft; a chute.
Standard, 2
c. Eng. See:manhole
d. A passage in or into a mine used as a footpath for workers.
Korson
e. A short heading between two chutes.
a. A horizontal projection of surface plants, mine workings, or both,
drawn to a definite scale, upon which is shown all the important features
of the mine; a plan; a plat.
b. The act of preparing such plans of a mine.
c. A representation to a definite scale on a horizontal plane of the
physical features of a portion of the Earth's surface (natural or
artificial or both) by means of symbols, which may emphasize, generalize,
or omit certain features as conditions may warrant. A map may be derived
from ground surveys made by transit, plane table, or camera, or from
aerial photographic surveys, or both. Seelye, 2
A method of representing the curved surface of the Earth on a flat map. As
the true shape of the Earth is a globe, it is impossible to make a map of
large areas of the Earth's surface without some distortion.
Hammond
A form of tube mill used in the cement industry, in which the pulverizing
is done by long pieces of hardened steel shafting. Liddell