a. To restore the diameter of a borehole by reaming. Long
b. To break down the walls between two contiguous drill holes.
Long
c. A sharp-pointed chisel, used for rough dressing stone.
Webster 2nd
d. The perpendicular grooves machined into the bit mold in which inside
and outside gage stones are set. Long
a. Trimming or straightening a mine working.
b. A method of rock excavation employed where it is important that the
adjacent rock formation should not be shattered by explosive. A line of
closely spaced holes is drilled along the required line of breakage. The
rock between the holes is knocked out with a broach and removed with the
aid of wedges. See also:channeler
c. Removing metal stock from a workpiece with a broach. ASM, 1
A tool used to restore the dimensions of a borehole that has been
contracted by the swelling of the marl or clay walls; also used to break
down the intervening rock between two contiguous drill holes. A reamer.
Fay
A special design of oven, used mainly for coking certain grades of coal.
Eng. A main working.
Where two or more mining claims longitudinally bisect or divide the apex
of a vein, the senior claim takes the entire width of the vein on its dip,
if it is in other respects so located as to give the right to pursue the
vein downward outside of the sideline. In other words, a broad lode
bisected by the division sidelines between two mining claims belongs to
the claim having the prior location. The term lode has become extensively
used in the classification of ore deposits that are not comprehended by
the definition of a vein. Such an occurrence is called a broad lode or
zone. See also:broad vein
A type of refraction seismic shooting used to determine the structure
across the strike. The broadside lines are ordinarily laid out in
conjunction with the standard-type profiles that run along the strike. The
shot points and detector spreads are laid out along parallel lines, which
are generally across the strike. The distance between each line of shots
and the receiving line is chosen so that it will always be greater than
the double offset distance for the refractor being followed. Generally the
distance should be only slightly greater so that the primary refracted
event will be received as a second arrival. When this spacing is used, the
refracting point associated with the shot will be very close to that
associated with the detector, and each delay time will be approx. half the
intercept time. A single depth point (based on half the intercept time) is
then plotted midway between shot and receiver. All depth points are thus
placed along the "control lines" that are located halfway between the
shooting line and the receiving line. Dobrin
A paving slab, so called because it is raised broad and thin from the
quarries, not more than 2 to 3 in (5.08 to 7.62 cm) thick.
Where a broad vein apexes so that the boundary line between two claims
splits the apex, the extralateral rights go to the senior locator, who
takes the entire width of the vein on the dip; i.e., a broad lode that is
bisected by the division side line between two mining claims belongs to
the claim having the prior location. See also:broad lode
A monoclinic mineral, Cu4 (SO4 )(OH)6 ; has one good
cleavage; occurs in the oxidation zone of copper sulfide deposits; a
source of copper. Formerly called blanchardite, kamarezite.
Syn:waringtonite
A hexagonal mineral, (Ca,Th,Ce)(PO4 ).H2 O ; rhabdophane
group.
A thorian variety of uraninite. Also spelled broggerite.
a. A variety of asphalt from Peru. Tomkeieff
b. A variety of anthraxolite. Crosby
An old Cornish mining term referring to a collection of loose rock
fragments usually discolored by oxidation, and indicating the presence of
a mineral vein beneath the outcrop or gossan. Also spelled bryle; broyl.
A charge of explosive in a drill hole divided into two or more parts that
are separated by stemming. Fay
In anthracite only; coal that is small enough to pass through a 3-3/8- to
4-in (8.57- to 10.16-cm) square aperture, but too large to pass through a
2-3/4-in or 2-1/2-in (6.99-cm or 6.35-cm) mesh. Smaller than steamboat,
and larger than egg coal. See also:anthracite coal sizes
a. A shattered rock formation or a formation crisscrossed with numerous,
closely spaced, uncemented joints and cracks. CF:loose ground; breccia.
Long
b. Rock or mineral formations fragmented by blasting with explosives, such
as the broken material in a shrinkage stope. Syn:broken rock
Long
See:broken ground
a. Eng. The removal or extraction of pillars previously formed in bord and
pillar working. In Durham and Northumberland, the terms robbery and
robbing pillars imply incomplete extraction of the pillars. SMRB
b. Robbery.
c. Robbing pillars.
a. A diamond that has been shattered in use, or lost a portion of its size
by cleaving. Long
b. See:crushed stone
The working away or removal of blocks or pillars of coal formed by whole
workings. See also:working the broken