Industry Glossary

Industry Glossary

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Term Definition
Ultimate analysis
Precise determination, by chemical means, of the elements and compounds in coal.
Umpire sample or assay
An assay made by a third party to provide a basis for settling disputes between buyers and sellers of ore.
Uncut value
The actual assay value of a core sample as opposed to a cut value which has been reduced by some arbitrary formula.
Undercut
To cut below or undermine the coal face by chipping away the coal by pick or mining machine. In some localities the terms undermine or underhole are used.
Underground mine
Also known as a deep mine. Usually located several hundred feet below the earth's surface, an underground mine's coal is removed mechanically and transferred by shuttle car or conveyor to the surface.
Underground station
An enlargement of an entry, drift, or level at a shaft at which cages stop to receive and discharge cars, personnel, and material. An underground station is any location where stationary electrical equipment is installed. This includes pump rooms, compressor rooms, hoist rooms, battery-charging rooms, etc.
Unit train
A long train of between 60 and 150 or more hopper cars, carrying only coal between a single mine and destination.
Upcast shaft
A shaft through which air leaves the mine.
Uraninite
A uranium mineral with a high uranium oxide content. Frequently found in pegmatite dykes.
Uranium
A radioactive, silvery-white, metallic element.

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