The duckbill assembly consists of five major units: (1) a shovel trough to
which is attached the shovel head fitting inside the feeder trough, (2) an
operating carrier that controls the connection or coupling between the
feeder and shovel troughs, (3) a sliding shoe that moves to and fro on the
floor of the seam, (4) a swivel trough, and (5) a pendulum jack. The
function of the duckbill is to gather the coal and load it into the shaker
conveyor pan column. The shovel is forced into the prepared coal by the
forward motion of the pan column. As the shovel is propelled forward, the
coal is conveyed back along the shovel trough and then to the pan column.
Mason
A continuous miner designed for driving coal headings in medium to thick
seams. The machine is crawler-mounted and equipped with two triple-arm
rotating cutting units and a chain conveyor. The cut coal is discharged on
to the chain conveyor which delivers into shuttle or mine cars. Also
called Goodman-type 500 miner. See also:continuous miner
Nelson
A trade term for a lot, parcel, or shipment of diamonds without regard to
quality, composition, or quantity. Chandler
Arkansas. Coal that can be shot "off the solid" with a large proportion of
lump coal and little slack. Fay
A yellowish-green variety of grossular.
An inferior grade of iron sinter containing silver. Also called goose
silver ore. Fay
a. In drilling, the bent-tube part of a water swivel to which the water
hose is connected. Long
b. A T-shaped connection for supplying water to the top end of wash rods
in penetrating overburden. It is fitted with pipe handles by means of
which the wash rods may be turned. Long
In hydraulic mining, driving the gravel forward with the stream from the
giant. Opposite of drawing.
An irregular prospecting drift following or seeking the ore without regard
to maintenance of a regular grade or section. Also called gopher drift.
Fay
Horizontal opening in wall of quarry, perhaps chambered or tee-headed in
preparation for blasting. Also, an irregular pitting hole made when
prospecting. Gophering is random prospecting by such pits or by gopher
drift. Also called coyote hole. Pryor, 3
Terms applied to the method of blasting in which large charges are fired
in small adits driven into the face of the quarry at the level of the
floor. See also:tunnel blasting
a. A method of breaking up a sandy, medium-hard overburden where
blastholes tend to cave in. A series of shallow holes are made by a bar,
and an explosive charge is fired in each. The debris is removed, and the
holes are deepened and further charges fired until the holes are deep
enough to take sufficient explosives to break the entire deposit.
Nelson
b. The haphazard working of the easiest and richest portions of an ore
deposit by miners with little or no capital. Nelson
In metal mining, one who extracts ore located in pockets or other parts
not accessible for machine drilling in an open pit mine. DOT
York. Sticky, dirty clay. Also spelled gore. Arkell
A monoclinic mineral, BaAl3 (PO4 )(PO3 OH)(OH) (sub
6) ; crandallite group; pseudotrigonal; forms spheroids in fractured
novaculite, Garland County, AR; and as rolled pebbles (favas) in the
diamantiferous sands of Brazil and Guyana.
A triclinic mineral, MgAl2 (PO4 )2 (OH)2 .8H
2 O ; paravauxite group; in glassy lath-shaped crystals in crusts
with variscite; near Fairfield, UT.
A rule by which the capacity of hydraulic elevators is computed. It is as
follows: M = H x N/C, where M = cubic yards of material lifted per hour, H
= available head of water in feet, N = water flow in cubic feet per
second, C = the efficient working height of the elevator, taken as head H
in hundreds of feet multiplied by 15. Lewis
A monoclinic mineral, K2 Ca5 (SO4 )6 .H (sub
2) O ; forms small, tabular crystals with glauberite and minor halite in
salt deposits at Ischl, Austria. Syn:mikheevite
A diamond-bearing quartz and clay gravel of Brazil. Hess
A barrel or tub for carrying water underground. CTD
A colorless, white, or bluish beryl from Goshen, MA. Schaller