wellhole


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wellhole

[′wel‚hōl]
(mining engineering)
A large-diameter vertical hole used in quarries and opencast pits for taking heavy explosive charges in blasting.
The sump, or portion of a shaft below the place where skips are caged at the bottom of the shaft, in which water collects.

well, wellhole

well, 1: W
1. The clear vertical space about which a stair turns; a stairwell.
2. The open vertical space between walls in which a stair or elevator is constructed.
3. Any enclosed space of small area but of considerable height, as an air shaft. well, 4.See bored well, dug well, etc.

wellhole

The open vertical space between walls in which a stair is constructed; see well, 1.