a. A short expansible-retractable device deliberately set in a cased or
uncased well bore to prevent upward or downward fluid movement; generally
for temporary use. AGI
b. A miner employed in stowing or packing the waste area. Also called
gobber. Nelson
Chinese. A silver-white alloy of copper, zinc, and nickel; German silver.
Case carburizing, using a solid carburized medium, followed by a hardening
treatment. CTD
The space adjacent to a gate end at the face and between the face end of a
gate-side pack and the coal face into which packs will be inserted when
the gate is ripped or dinted. TIME
a. Occurs in crushing plants when the material in the chamber is so
compacted as to be nearly without voids. It occurs when free downward
movement is inhibited. South Australia
b. The filling of a waste area with stones and dirt.
See also:solid stowing
c. The method of giving support to a roof by the insertion of waste
material placed or built into space from which coal or ore has been
extracted. TIME
d. The spacing or density pattern of the mineral grains in a rock.
CF:fabric
e. See:blocking
f. With gyratories, packing copy refers to an accumulation of sticky fines
on the diaphragm. South Australia
The bulk density of a granular material, when packed under specified
conditions. It is commonly determined, particularly for foundry sands.
Ratio of true volume to bulk volume. Van Vlack
An explosion-proof entrance for conductors through the wall of an
explosion-proof enclosure, to provide compressed packing completely
surrounding the wire or cable, for not less than 1/2 in (1.27 cm) measured
along the length of the cable.
A very fine-grained sandstone that is so loosely consolidated by a little
calcareous cement as to be readily cut by a spade. AGI
A dry-stone wall built along the side of a roadway, or in the waste area,
of a coal or metal mine. The wall helps to support the roof and also to
retain the packing material and prevent it spreading into the roadway.
Nelson
a. Ground-contact part of a crawler-type track. Nichols, 1
b. See:wallplate
c. The refractory brickwork below the molten iron at the base of a blast
furnace. Dodd
a. Numbered wooden marker which shovelers put in the cans of ore that they
load. Hess
b. A straight iron tool for stirring ore in a furnace. Standard, 2
c. A bat or pallet, as used in tempering clay. Standard, 2
d. A scoop for stirring and mixing, as used in glassmaking.
Standard, 2
See:paddle-type mixing conveyor
A belt loader equipped with chain-driven paddles that move loose material
to the belt. Nichols, 1
A form of worm conveyor having two noncontinuous spirals that form
paddles; the shafts are contrarotating and the spirals opposite.
See also:paddle-type mixing conveyor
A type of conveyor consisting of one or more parallel paddle conveyor
screws. See also:blending conveyor; paddle conveyor.
A type of conveyor consisting of one or two inclined parallel paddle
conveyor screws in a conveyor trough having a receiving tank and an
overflow weir at the lower end and a discharge opening at the upper end.
A centrifugal fan with radial blades. Strock, 2
A borehole drill bit having cutters that expand on pressure. Also called
expansion bit; paddy bit. Long
See:paddy
A portable battery-operated lamp attached to the front or rear of a
personnel train. BS, 13