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Mining
Glossary
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Deep Mining - The exploitation
of coal or mineral deposits at depths exceeding about 3,000 feet.
Also known as underground mining.
Dragline - A type of excavating equipment which
casts a rope-hung bucket a considerable distance, collects the
dug material by pulling the bucket toward itself on the ground
with a second rope, elevates the bucket, and dumps the material
on a spoil bank, in a hopper, or on a pile.
Dredging - The removal of soils from under water,
using the water as a means of transportation to convey the soils
to final positions.
Drift - A horizontal underground passage. A
drift follows the vein rather than intersect it like a crosscut.
Drill - Any cutting tool or form of apparatus
using energy in any one of several forms to produce a circular
hole in rock, metal, wood, or other material.
Duckbill - The name given to
a shaking-type combination loading and conveying device, so named
from the shape of its loading end and which generally receives
its motion from the shaking conveyor to which it is attached.
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