upcast(redirected from upcast shafts)
Also found in: Dictionary, Thesaurus.
The opening through which the return air ascends and is removed from the mine; the opposite of downcast or intake.
An upward current of air passing through a shaft.
Material that has been thrown up, as by digging.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.