The angle between the horizontal and the surface slope of any pile of
material formed by free fall of the material.
Assessment work on a mining claim.
The scale of a map, expressed in the form of a numerical fraction that
relates linear distances on the map to the corresponding actual distances
on the ground, measured in the same units (centimeters, inches, feet);
e.g., 1/24,000 indicates that one unit on the map represents 24,000
equivalent units on the ground. Abbrev: RF. AGI
In testing or valuation of a mineral deposit, samples large enough and
average in composition as to be considered representative of a specified
volume of the surrounding orebody. Blended large samples from different
exposures are not necessarily representative, since the mineral structure
may have varied so as to introduce special problems from area to area in
treatment. Pryor, 3
A small lightweight device, used in pairs that straddle and are locked to
each of the rails to retrack railroad cars and locomotives. Of Y-shaped
design, they permit both wheels to be retracked from either or both sides
of the rail at the same time. As the car is pulled across the device, the
derailed wheels are channeled back onto the tracks. Also called retracker.
See also:frog
To move live workers or dead bodies from a mine after a mine disaster.
Sometimes called recover. The latter applies esp. to putting the mine in
shape for operation again.
A name applied to certain types of apparatus worn by workers, permitting
them to work in noxious or irrespirable atmospheres such as obtained
during mine fires, following mine explosions, as a result of accidents in
ammonia plants, from smelter fumes, etc. Oxygen compressed in a cylinder,
a regenerating substance to purify the breathed air, and a closed system
constitute the general principle of the apparatus.
See also:mine rescue apparatus
See:mine rescue car
Mine chamber equipped with rescue gear, including oxygen apparatus, and
manned by trained rescue workers. Pryor, 3
A team of workers, from five to eight strong, trained in the use of
breathing apparatus and in rescue operations after colliery explosions or
mine fires. The team trains every week or so at a rescue station.
Nelson
Word often misused. Two broad meanings are reexamination of previously
accepted data in the light of current expansion of basic knowledge; and
search in reality, specific to an entirely novel concept and calling for
development of new approaches. Wrongly defined when descriptive of
original rehash. Pryor, 3
a. A method in surveying by which the horizontal position of an occupied
point is determined by drawing lines from the point to two or more points
of known position. Syn:intersection
b. A method of determining a plane-table position by orienting along a
previously drawn foresight line and drawing one or more rays through the
foresight from previously located stations. AGI
A fault-line scarp in which the structurally downthrown block is also
topographically lower than the upthrown block.
CF:obsequent fault-line scarp
a. The quantity of mineral that is calculated to lie within given
boundaries. It is described as total (or gross), workable, or probable
working, depending on the application of certain arbitrary limits in
respect of deposit thickness, depth, quality, geological conditions, and
contemporary economic factors. Proved, probable, and possible reserves are
other terms used in general mining practice. BS, 7
b. Sampled ore, developed, blocked out, or exposed on not less than three
sides. See also:development sampling; ore reserve; probable ore;
workable. CTD
c. The amount of payable ore, developed and ready for extraction, or
blocked out ahead of immediate requirements. Weed, 2
That part of an identified resource that meets specified minimum physical
and chemical criteria related to current mining and production practices,
including those for grade, quality, thickness, and depth. The reserve base
is the in-place demonstrated (measured plus indicated) resource from which
reserves are estimated. It may encompass those parts of the resources that
have a reasonable potential for becoming economically available within
planning horizons beyond those that assume proven technology and current
economics. The reserve base includes those resources that are currently
economic (reserves), marginally economic (marginal reserves), and some of
those that are currently subeconomic (subeconomic resources). The term
geologic reserve has been applied by others generally to the reserve-base
category, but it also may include the inferred-reserve-base category;
geologic reserve is not part of this classification system.
USGS, 2
Coal reserved from lease, as coal under buildings.
Defined by the U.S. Department of the Interior as "federal lands which are
dedicated or set aside for a specific public purpose or program and which
are, therefore, generally not subject to disposition under the operation
of all the public land laws." SME, 1
Economic minerals that are not the property of the landowner but belong to
the State. The State confers the right to prospect for and to mine these
minerals on any one who applies for this right on the form prescribed and
at the competent mining office. Such minerals as coal and iron ores are
included in this group. CF:unreserved mineral
a. An estimate within specified accuracy limits of the valuable metal or
mineral content of known deposits that may be produced under current
economic conditions and with present technology. Shanz
b. That part of the reserve base that could be economically extracted or
produced at the time of determination. The term reserves need not signify
that extraction facilities are in place and operative. Reserves include
only recoverable materials; thus, terms such as extractable reserves and
recoverable reserves are redundant and are not a part of this
classification system. Syn:mineral reserves
See also:measured resources
In flotation, the component of control action in which the final control
element is moved at a speed proportional to the extent of proportional
position action. This term applies only to a multiple action including
proportional position action. Fuerstenau
A bit made by reusing the sound diamonds salvaged from a used drill bit
and setting them in the crown attached to a new bit blank. Some new
diamonds usually are added to those salvaged, since generally not all of
the salvaged or recovered stones are reusable. Syn:replacement bit
Long