Laborer who builds walls to support backfilling. See:pack builder
Fay
Scot. The face of the coal wall; the working face. Fay
a. The drag created in the flow of a liquid or gas because of contact with
the wall surfaces of its conductor, such as the inside surfaces of a pipe
or drill rod or the annular space between a drill string and the walls of
a borehole. Long
b. The drag resulting from compaction of loose materials around the
outside surfaces of drive pipe, casing, etc. Also called skin friction.
Long
a. The brick or stone lining of shafts. Fay
b. Derb. Stacking or setting up ironstone, etc., in heaps, preparatory to
being measured or weighed. Fay
See:curb; foundation curb; water ring.
A movable wooden scaffold suspended from a crab on the surface, upon which
the workers stand when walling or lining a shaft. Fay
The building up of a layer of mud cake or compacted cuttings on the
borehole sidewalls; the filling of cracks or caved portions of the
borehole walls with cement. Long
To seal cracks, crevices, etc., in the wall of a borehole with cement, mud
cake, compacted cuttings, or casing. Long
The compaction of sticky cuttings that collect and adhere to the walls of
a borehole. Long
a. A horizontal timber supported by posts resting on sills and extending
lengthwise on each side of a tunnel. Roof supports rest on wallplates.
Syn:pad
b. A horizontal member, usually of wood, bolted to a masonry wall to which
the frame construction is attached. Also called headplate. ACSG, 1
A machine-bolt anchor with a head at one end and threaded at the other,
and fitted with a plate or punched washer so that when embedded in the
masonry it will be securely anchored and will hold a wallplate in place.
ACSG, 1
a. See:country rock
b. The rock forming the walls of a borehole. Long
c. The rock adjacent to, enclosing, or including a vein, layer, or
dissemination of ore minerals. It is commonly altered. The term implies
more specific adjacency than host rock or country rock.
Syn:walls of a vein
d. The rock mass comprising the wall of a fault. AGI
A dispersion pattern formed in the rock adjoining mineral deposits where
the chemical composition has been modified by the ore-forming fluids.
See:halo
A channel dispersion pattern in which the minor elements of the walls of
the channels have been modified. Wall-rock dispersion patterns of
importance usually are those formed at the time the orebodies were being
deposited. Lewis
a. Coal roadways in pillar-and-stall mining. Nelson
b. The side of an orebody defining where the ore ceases and the country
rock begins. Walls may be definite or indefinite. See also:footwall;
hanging wall. Nelson
See:nitrocalcite
A rotary bit used to enlarge the diameter of a borehole. BS, 9
Eng. A grade of coal for household purposes: originally from Wallsend, on
the Tyne, but now from any part of a large district in and near Newcastle.
Standard, 2
See:wall; wall rock.
A triclinic mineral, Bi4 O4 (UO2 )(AsO4 ).2H
2 O ; radioactive; yellow-orange; associated with troegerite,
zeunerite, uransphaerite, torbernite, and uranospinite. Also spelled
walpurgin.