Eng. A portion of ore set aside for the payment of rental or royalty on
mineral lands. Fay
The right to enter, develop, and work a coal or mineral deposit.
See also:claim; lease. Nelson
See:toadstone
Eng. Shelly pink limestone in the Corbula Beds of the Purbeck Beds at
Durlston Bay. So called because it is full of the small gastropods
Pachychilus manselli that resemble eyes when seen in transverse section.
CF:rabbit-eye
A reddish or brownish variety of cassiterite in botryoidal or reniform
shapes with internal concentric or fibrous structure.
a. Applied earlier to various stones or stonelike objects likened in color
or shape to toads (batrachites, bufonites, crapodius). Syn:toadrock;
fiery dragon. Arkell
b. Eng. A kind of traprock.
c. An old Derbyshire name for amygdaloidal basalt lava in the
Carboniferous Limestone.
d. A fossilized object, such as a fish tooth or palatal bone, once thought
to have formed within a toad and frequently worn as a charm or an antidote
for poison. Syn:toadrock
A term used in the Southwest United States for a favorable host rock for
uranium, characterized by light yellow or gray color and by brown limonite
stains. AGI
An orthorhombic mineral, Ca9 Si12 O30 (OH)6
.4H2 O ; the principal cementing compound in Portland cement.
A mixture of columbite and samarskite.
A monoclinic mineral, (Na,Ca)0.5 (Mn,Mg)6 O12 .4H
2 O ; forms black spongy banded and reniform aggregates composed of
minute lathlike crystals; in Hokkaido, Japan.
a. The base of the coal, ore, or overburden face in a quarry or opencast
mine. Nelson
b. The front end of a frog, opposite the heel, in a car track.
c. The lowest part of a slope or cliff; the downslope end of an alluvial
fan. AGI
A raised edging around the perimeter of a work platform in drilling to
prevent hand-tools from being accidentally kicked or knocked off the
platform. Long
In underground blasting, the cut obtained by the use of single cut holes
inclined downward. Lewis
A blasting hole, usually drilled horizontally or at a slight inclination
into the base of a bank, bench, or slope of a quarry or open pit mine.
A quarry term for the wedging-in of the end of a granite sheet under an
overhanging joint, probably in consequence of the faulting of the sheets
along the joint. It is also applied to the overlapping of lenticular
sheets. Fay
The distance from the inner end of the hole to the adjacent free face
measured at right angles to the direction of the hole; or that portion of
the hole that is filled with powder; or that part of the seam to be broken
lying between the powder and a free face. Zern
See:toernebohmite
The drilling of large-diameter blasting holes in quarries and opencast
pits. They are put down vertically from top to bottom of the quarry face.
Deck loading is often adopted, with half to two-thirds of the total charge
at the bottom and the remainder in one or more deck charges as required.
Nelson
a. Made to gauge, or a size as specified, esp. as applied to the outside
set diameter of bits and reaming shells and the inside diameter of a
borehole. Long
b. To determine, by measurement or other test, the capacity, quantity, or
dimension. Long
Application of crushing force so that the distance moved diminishes
without change of input strength, between gape and set. Thus greatest
speed of movement of the approaching faces is applied with weakest thrust
and vice versa. Pryor, 4