rathole
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rathole [′rat‚hōl]

(mining engineering)

A shallow, small-diameter, auxiliary hole alongside the main borehole, drilled at an angle to the main hole; after core drilling is completed, the rathole is reamed out and the larger-size hole is advanced, usually by some noncoring method.

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rathole (redirected from ratholes)

rathole
(redirected from ratholes)