One of the mysteries of the English language finally explained.
A shaft through which air leaves a mine.
mineshaft, tunnel, passage, pit, adit, downcastView synonyms
- ‘To supplement the flow of air, underground furnaces were at first built in the upcast shafts of some mines in the Crowsnest, and elsewhere, to heat the air and speed the process by which warm air was expelled and new air was drawn in.’
- ‘Approaching demolition, various holes appeared in the brickwork of the upcast shaft allowing access to the foolhardy.’
- ‘As regards the engine pit, one of the upcasts, the waste water from the pumps was so considerable as to keep the shaft constantly wet.’
- ‘One of the shafts at Whinney Hill then became the upcast shaft for both collieries.’
- ‘A new upcast shaft was sunk by Allied Constructions Pty Ltd.’
Cast (something) upward.‘upcast light’
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