a. Grubstake.
b. A pointed piece of wood driven into the ground to mark a boundary,
survey station, or elevation.
c. See:sprag
d. An iron peg used as power electrode to transfer current into the ground
in electrical prospecting. This term is also used to include all power and
search electrodes, such as iron pegs, copper coils, and copper screens;
also, a station marker used by field parties. AGI
e. A permanent interest, as in an enterprise or a mine.
The physical act of locating a lode or placer mining claim.
A conical or cylindrical mineral deposit that hangs from the ceiling of a
cave. See also:stalagmite
A conical or cylindrical mineral deposit that is developed upward from the
floor of a cave by the action of dripping water. See also:stalactite
Syn:dropping stones
An apparatus for determining surface tension. The mass of a drop of a
liquid is measured by weighing a known number of drops or by counting the
number of drops obtained from a given volume of the liquid.
Lowenheim
Eng. A mass of ore left in a mine.
a. A narrow coal drivage in pillar-and-stall. See also:narrow stall;
stallman. Nelson
b. A working place at the coal face; a term associated with narrow
workings. Mason
See:room-and-pillar
A pillar method of working a relatively thick coal seam by a system of
compartments; a modification of pillar-and-stall. Nelson
The blades of axial-flow fans are of aerofoil section, which when inclined
at a small angle (known as the angle of attack) to the air stream produce
a large lift or raising force for a small drag or retarding force. The
lift force is the useful one which gives the thrust to the air in an
axial-flow fan. The lift increases with increase in the angle of attack
until a point is reached when the lift begins to fall. This angle is the
"critical" or "stalling angle." Syn:critical angle
A collier who works at the face of a narrow stall or a longwall stall. The
collier is paid according to a pricelist of so much per ton of coal loaded
out and for other work, such as timbering. A stallman usually has another
miner alongside. Nelson
The roasting of ore in small enclosures of earth or masonry walls. The
enclosures are called stalls and may be open or closed. Fay
See:feeder breaker
a. To break up ore and gangue by machinery, for washing out heavier
metallic particles.
b. A heavy pestle raised by water or steam power for crushing ore. A stamp
in which the blow of the pestle is caused by its mere weight is called a
gravity stamp. Webster 3rd
See:stamp mill
The amount of ore (tons) that one stamp will crush in 24 h.
A stamp-mill mortar box. Fay
A power hammer that moves vertically. Webster 3rd
A heavy and nearly cylindrical cast-iron head fixed on the lower end of
the stamp rod, shank, or lifter to give weight in stamping the ore. The
lower surface of the stamp head is generally protected by a cheese-shaped
shoe of harder iron or steel that may be removed when worn-out. These
shoes work upon dies of the same form laid in the bottom of the mortar or
stamper box. See also:stamp
a. Reducing to the desired fineness in a stamp mill. The grain is usually
not so fine as that produced by grinding in pans. Fay
b. A general term covering almost all press operations. It includes
blanking, shearing, hot or cold forming, drawing, bending, and coining.
ASM, 1
c. A process for application, by hand or by machine, of decoration to
pottery ware; a rubber stamp with a sponge backing is used. Stamping is
particularly suitable for the application of backstamps and for some forms
of gold decoration. See also:backstamp
Leic. A heavy pick.