Extra tooth designed for driven wheel so that its total number of teeth is
not a multiple of those of the driving pinion. Pryor, 3
A trigonal mineral, CaMg3 (CO3 )4 ; in white chalky
masses in caves; as a weathering product in vugs and veins in
magnesium-rich rocks; in magnesite deposits in Nevada.
Treatment of precious metal ores containing copper or zinc, using an
ammoniacal cyanide solution and recovering ammonia by boiling.
Liddell
A temporary screen or curtain to deflect the air upwards against the roof
to disperse gas. BS, 8
a. Scot. A temporary screen or curtain for clearing gas out of a pit. Used
esp. where gas has collected in potholes or caves in the roof. Fay
b. Scot. A screen used in underground firefighting that pushes the smoke
back toward the fire and allows the firefighting team to advance within
striking distance of the fire. McAdam, 1
A screen of brattice cloth erected across a roadway below a roof cavity or
at the ripping lip to divert the air current upwards to dilute and remove
an accumulation of combustible gases. See also:pocket of gas
Nelson
a. See:hurdy-gurdy wheel
b. A dance house in a mining camp. Standard, 2
A hand auger used to drill boreholes in soft rock or rock material, such
as soil, clay, coal, etc. Long
A water wheel operated by the direct impact of a stream upon its radialIy
placed paddles. Syn:hurdy-gurdy
A monoclinic mineral, Mn5 (PO4 )2 [PO3 (OH)]
2 .4H2 O ; in pegmatites.
Scot. A wheelbarrow. Standard, 2
A mechanical device for the rapid stemming of shotholes. It consists of a
sand funnel connected by a T-piece to the charge tube, one end of which is
provided with a valve and fittings to the compressed air column. The
funnel is filled with sand, which is held uppermost, and the charge tube
is inserted into the shothole. The sand is injected by the compressed air,
and the tube is gradually withdrawn as the hole is being filled.
Nelson
a. Scot. A screen or sieve.
b. To haul, pull, or push cars of coal in a mine. Fay
c. A chute, slide, or pass as for ore in a mine, or for coal discharged
from cars into vessels. Webster 2nd
d. Gr. Brit. A wooden staging on a navigable river from which to load
vessels with coal. Standard, 2
Scot. The fine material that passes through a screen or sieve.
Eng. To clear away (soil) from ore with a rush of water.
Standard, 2
See:hydraulic prospecting; booming. AGI
a. Corn. A cistern or box for washing ore. See also:jig
Syn:washing hutch
b. Scot. A basket for coal. Standard, 2
c. The bottom compartment of a coal or ore-dressing jig.
Webster 3rd
d. The part of a jig below the screen plate, in which the washbox rests
and the pulsating movement of the water takes place. BS, 5
e. A car on low wheels in which coal is drawn and hoisted out of a mine
pit. Webster 3rd
f. To wash ore in a box or jig.
g. A basket for measurement and transport of coal.
h. A small train or wagon for removing coal or ore from a mine.
i. An old and varying English measure, as (for coal) 2 Winchester bushels
(70.5 L). Webster 2nd
j. Scot. Two hundredweight (91 kg or 96 kg) of pyrites.
Standard, 2
k. The bottom compartment of an ore-dressing jig and/or the mineral
product that collects there. Webster 3rd
l. The part of a washbox situated below the screenplate in which the
controlled pulsating movement of the water takes place. BS, 5
The boards that form the sides, bottom, and ends of a mine car, or hutch.
Standard, 2
One who runs hutches. Webster 2nd
N. of Eng. Term used for tramming. Nelson
A repairer of tubs or hutches broken in a mine. CTD