a. A condition existing when the drive rod of the drill swivel head is not
centered and parallel with the borehole being drilled. Long
b. A borehole that has deviated from its intended course. Long
c. A condition existing wherein any linear excavation (shaft, drift,
borehole, etc.) deviates from a previously determined or intended survey
line or course.
Electricity drawn at a period when the power station that supplies it is
not fully loaded. Pryor, 3
A hexagonal mineral, (K2 ,Ca)5 Al10 Si26 O
72 .30H2 O ; zeolite group; commonly intergrown with erionite
and levyne as a vein or cavity filling in mafic lavas.
a. A short drift or crosscut driven from a main gangway or level.
Fay
b. The horizontal distance between the outcrops of a dislocated bed.
Fay
c. Of a fault, the horizontal component of displacement, measured
perpendicular to the disrupted horizon. See also:normal shift
AGI
d. A side (horizontal) measurement of distance perpendicular to a line,
usually a transit line. Seelye, 2
e. To collar and drill a borehole at some distance from the designated
site to avoid a difficult setup. Long
f. To drill a borehole near one previously drilled, which may have been
lost, for purposes of correlation or to determine the lateral extent of
mineralization. Long
g. An abrupt change in the trend of a drill hole, usually caused by a
small shelflike projection of rock alongside one wall of the drill hole.
Long
h. A well drilled near the boundary of a lease opposite a completed well
on an adjacent lease. Syn:offset hole; offset well. Long
i. To offset a well by drilling the next adjoining location in accordance
with a spacing pattern. Wheeler, R.R.
j. A spur or minor branch from a principal range of hills or mountains.
k. The distance along the strain coordinate between the initial portion of
a stress-strain curve and a parallel line that intersects the
stress-strain curve at a value of stress which is used as a measure of the
yield strength. It is used for materials that have no obvious yield point.
A value of 0.2% is commonly used. ASM, 1
a. A mineral deposit, esp. of sulfides, formed partly by magmatic
segregation and partly by hydrothermal solution, near the source rock.
AGI
b. At Sudbury, ON, Canada, the term refers to dikelike bodies radiating
from the Sudbury Complex, thought to have been filled from above by
xenolithic rock fragments and massive pyrrhotite-chalcopyrite-pentlandite.
AGI
In a ladder ditcher, digging with the boom not centered in the machine.
Nichols, 1
See:offset
In surveying, a line established parallel to the main survey line, and
usually not far from it; e.g., a line on a sidewalk, 2 ft (0.6 m) from the
established street line, or a line parallel to the centerline of a bridge
and 50 ft (15.2 m) from it. Seelye, 2
A ridge that is discontinuous because of faulting. AGI
In surveying, a rod, usually 10 links (0.2012 m) long, used in measuring
short offsets. Webster 2nd
See:offset
A driller or drill-crew-worker working on the opposite shift. Also called
drill helper. Long
A length of boring rods unscrewed and detached at the top of a borehole.
Also called rod stand; setout. BS, 9
See:shackler
One of the auxiliary rods at the top of a winding shaft for guiding and
steadying the cages during decking or loading and unloading operations.
Nelson
Hauling that takes place off the public highways, generally on a mining or
excavation site. The hauling units used are generally higher and wider
than those used in over-the-road hauling since highway restrictions do not
limit size, weight, etc. CF:over-the-road hauling
In this type of blasting, coal is blasted from the solid with no
precutting or shearing. McAdam, 2
The space before the fire in a kiln. Also called killogie.
Standard, 1
The practical mks unit of electric resistance that equals the resistance
of a circuit in which a potential difference of 1 V produces a current of
1 A; the resistance in which 1 W of power is dissipated when 1 A flows
through it. The standard in the United States. Symbols, Omega and omega .
Webster 3rd; Zimmerman
A type of galvanometer that directly indicates the number of ohms of the
resistance being measured. Crispin
The formula expressing Ohm's law is I = E/R, in which I is the electric
current in amperes; E is the electromotive force in volts; and R is the
resistance in ohms. Handbook of Chemistry and Physics, 2