A system of reduction of levels by working out the rise or fall of staff
readings from each level point to the one following it.
See also:collimation
A face advancing toward the rise of a coal seam. Briggs
A heading driven to the rise in a long-way workings. See also:heading
a. A shaft excavated from below upward. See also:raise; rise.
Fay
b. See:column pipe; rising main.
a. An excavation carried from below upward; a rise or riser.
Standard, 2
b. Eng. The horizontal division of the stratum, from which the blocks of
stone are lifted; e.g., in the Portland quarries. Arkell
See:rising main
The direction in which a drill circulation fluid is flowing after it has
passed the bit and continues toward the collar of a borehole. Long
A soil permeability test in which the level of water in a borehole is
reduced and then the rate at which the water recovers is observed.
Mining
a. The length of steel piping that conveys the water from a pump to the
surface or to a higher pump in the shaft. The term rising main is
obsolete; delivery column preferred. Syn:delivery column
Nelson
b. See:column pipe
Excavating a shaft upwards from mine workings. See also:rise;
staple shaft. Nelson
See:xanthoconite
The energy required for reduction in particle size of a solid is directly
proportional to the increase in surface area. CF:Kick's law
CCD, 2
A side-bump table with plane surface, actuated by a cam, spring, and
bumping post. Liddell
A pick with one or two points, formed of flat iron, used to undercut coal
by scraping instead of striking. Fay
A ridge or mound of boulders, gravel, sand, and mud found along or in a
stream channel at places where decrease in velocity causes deposition of
sediment.
a. Gravel flats and terraces laid down by rivers when flowing at higher
levels than at present. The deposits are sometimes gold or tin-bearing.
See also:bench placer
b. A term used in Alaska for placers on gravel flats in or adjacent to the
beds of large streams.
A claim that includes the bed of a river.
The gravel deposits accumulated by a river in its torrential stages.
See:alluvial flat
Mining or excavating beds of existing rivers after deflecting their
course, or by dredging without changing the flow of water.
Applied in Florida to a certain class of phosphatic pebbles, or
concretions, found in rivers as distinguished from land pebble phosphate.