cover hole

cover hole

[′kəv·ər ‚hōl]
(mining engineering)
One of a group of boreholes drilled in advance of mine workings to probe for and detect water-bearing fissures or structures.
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References in periodicals archive ?
'This 'Dig Hole Cover Hole' attitude of LPRC as exposed by online watchdog must be investigated and perpetrators brought to book.
The Midlands, of course, was the industrial forge of heavy metal, and Hetfield dedicated Black Sabbath cover Hole In The Sky to Tony Iommi, who sat in the front row.
Mark the cover hole on the tile and cut it out with an abrasive blade in a jigsaw.
UNACCEPTABLE: Kitchen facilities, left, and paper being used to cover holes in the wall at Oban Police Station
Roof decking had been completed, with plywood sheeting used to cover holes until proper lids were fitted.
"Why do we have to mortgage this wealth today in order to cover holes in public finances?" he asked.