In bituminous coal mining, a person who operates a machine to load coal in
mine (pit) cars. DOT
a. The angle between the horizontal and any linear feature, such as an ore
shoot or lineation, measured in the plane containing the linear feature.
See also:rake
b. The angle between the horizontal and an axial line passing through the
highest or lowest points of a given stratum in an anticline or syncline.
c. Loosely, the grade, rise, or incline of a seam or bed.
d. A vein-form deposit that follows dipping joint planes. This usage is
confined largely to the Upper Mississippi Valley lead-zinc deposits.
e. The slope of a roof, in inches (or centimeters), of vertical rise per
horizontal foot (or meter).
f. The distance between tooth centers, as in a gear wheel, or the number
of teeth per unit of diameter. See also:pitch line
g. The grade of an incline or the rise of a coal seam. BCI
h. The solid or semisolid residue from the partial evaporation of tar.
Strictly, pitch is a bitumen with extraneous matter, such as free carbon,
residual coke, etc. Nelson
i. The angular inclination of an ore shoot with respect to the surface,
measured in the direction of the strike. Nelson
j. Of a lode, angle of deviation from the vertical taken by a section of
ore having some special characteristic, such as enhanced value.
Pryor, 3
k. The angle that a directional feature, for example, slickensides, in a
plane makes with a horizontal line within the plane. BS, 11
l. In dredging, the distance between the center of any pin and that of the
pin in the next adjacent bucket. Fay
m. See:dip
n. The slope of a surface or tooth relative to its direction of movement.
Nichols, 1
o. In a roller or silent chain, the space between pins, measured center to
center. Nichols, 1
p. The amount of advance of a single-thread screw in one turn, expressed
in lineal distance along or parallel to the axis, or in turns per unit of
length. Standard, 2
q. The distance between corresponding points on adjacent projections
produced on work by a cutting tool. ASM, 1
One of the rods, usually adjustable, which determine the digging angle of
a blade or bucket. Nichols, 2
The massive variety of uraninite, UO(2+x) ; radioactive; black to
dark brown; the most important ore of uranium; occurs widely in
hydrothermal veins and the disseminated uranium-vanadium deposits of the
Colorado Plateau type. Syn:pitch ore
The circle passing through the chain joint centers when the chain is
wrapped on the sprocket. Jackson, 1
The diameter of a circle that passes through the points of average contact
between the teeth of two gears running in mesh, or between the teeth of a
sprocket and the roller of its companion chain, or between a male and a
female thread that are engaged. Brantly, 2
One who picks over dumps for pieces of ore. Webster 3rd
A kind of pick used, esp. by miners, in beginning a hole.
Webster 2nd
A chisel used for making an edge on the face of a stone. Also called
pitching tool. Webster 3rd
A highly inclined seam. In coal mining, called edge coal. Nelson
The length of an ore shoot in its greatest dimension.
a. The line on which the pitch of gear teeth is measured; an ideal line,
in a toothed gear or rack, bearing such a relation to a corresponding line
in another gear with which the former works that the two lines will have a
common velocity, as in rolling contact. See also:pitch
Webster 3rd
b. The line along which the pitch of a rack is marked out, corresponding
to the pitch circle of a spur wheel. CTD
A quarry worker's term for trimming an edge of a block of stone with a
hammer and set. Fay
See:pitchblende; pitchy copper ore.
A dark, resinous volcanic glass.
In coal mining, work done on shares. Standard, 2
Mine working in a steeply inclined seam.
adj. Resembling the appearance or properties of pitch.
a. A dark, pitchlike oxide of copper. Syn:pitch ore
b. A mixture of chrysocolla and limonite.