The rapid growth and multiplication of plankton, usually plant forms,
producing an obvious change in the physical appearance of the sea surface,
such as coloration or slicks. Also called sea bloom; florescence.
Hy
Relating to the chiefly simple types of floating and surface-dwelling
forms of organisms of the ocean waters. Schieferdecker
The lining of a shaft with planks, spiked on the inside of curbs.
See also:tubbing
The predesign of the detailed layout, main roadways, and workings of a
mine or group of mines. The scheme usually involves the introduction of
mechanical equipment for the working and transport of the coal or mineral.
The selection of mining methods and machines properly adapted to the local
conditions is part of planning. Nelson
A mining engineer responsible for mine planning. The engineer is attached
to the planning department of a large mine or a group of smaller mines and
is qualified by training, experience, and technical qualifications to
envisage new development work and coordinate the ideas of other experts
such as a mechanization engineer, ventilation engineer, mining geologist,
etc. Nelson
Pictorial view of an object showing it in plan with oblique lines showing
the front, side, and thickness. See also:projection
A great soil group in the 1938 classification system; an intrazonal,
hydromorphic group of soils having a leached surface layer above a
definite clay pan or hardpan. These soils develop on nearly flat upland
surfaces under grass or trees in a humid to subhumid climate. AGI
a. The shaft or slope, tunnels, engine houses, railways, machinery,
workshops, etc., of a colliery or other mine.
b. To place gold or any valuable ore in the ground, in a mine, or the like
to give a false impression of the richness of the property. To salt, as to
plant gold with a shotgun. See also:salting a mine
c. In mining, the mechanical installations, machines, and their housings.
Earthworks are sometimes loosely included. Pryor, 3
d. Used to include the machinery, derricks, railway, cars, etc., employed
in tunnel work. Stauffer
The process of soil stabilization in which the soil is carried to a
stationary mixer, returned to the site after mixing and then spread.
CF:mix-in-place
Concrete that is mixed at a central mixing plant and delivered to a site
in special equipment designed to prevent its segregation. Hammond
A method of preparing aggregates for bituminous surfaces in which
aggregates and bitumen are combined in a plant situated at the road or at
a relatively long distance from the road. Also known as the premixed
method. Pit and Quarry
Scrap metal produced in the plant itself; e.g., sprues and gates in a
foundry or defective ingots and hot tops in a steel mill. Also called home
scrap. Newton, 1
a. Gas comprising equal amounts of positively and negatively charged
particles; a fourth state of matter (solid, liquid, gas, plasma) capable
of conducting magnetic force. Pryor, 3
b. A bright-, leek-, to emerald-green subtranslucent variety of
cryptocrystalline (chalcedonic) quartz. The green color is attributed to
chlorite. CF:bloodstone; heliotrope.
c. That part of a soil which can be or has been moved, reorganized, and/or
concentrated by soil-forming processes.
a. A jet formed by passing a high-speed current of nitrogen or a mixture
of nitrogen and hydrogen over a tungsten electrode placed in a specially
designed narrow orifice in a cutting torch. An arc is struck between this
electrode and the earthed nozzle of the torch, which is cooled by a water
jacket. When a plasma jet is used to cut rock, two separate zones of
action can be expected. Min. Miner. Eng., 1
b. Ionized gas produced by passing an inert gas through a high-intensity
arc, causing temperatures up to tens of thousands degrees centigrade.
Harbison-Walker
See:mudcapping
A machine consisting of a roller or set of rollers for grinding lime or
gypsum to powder. Fay
Derb. A gypsum mine.
a. A surface blasting method used when no rock drill is available or is
not necessary. It consists of placing a charge of gelignite, primed with
safety fuse and detonator, in close contact with the rock or boulder and
covering it completely with stiff damp clay. The charges vary from 8 to 16
oz/yd3 (297 to 593 g/m3 ) of rock. See also:popping;
snakeholing. Nelson
b. A form of secondary blasting in which the explosive is detonated in
contact with the rock without the use of a shothole.
See also:secondary blasting; mudcapping. BS, 12
See:gypsum
Said of a body in which strain produces continuous, permanent deformation
without rupture. CF:elastic
plastic and semiplastic explosive
Any of several explosives used for commercial purposes. The consistency is
such that the explosive can be shaped by moderate pressure to fill a drill
hole. The difference between plastic and semiplastic form is primarily
dependent on the difference in equipment which has been found necessary in
manufacturing cartridges of the explosive. The viscosity of the plastic
type makes it possible to produce cartridges by a process of extrusion
through tubes. Fraenkel