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.
References in periodicals archive ?
Oil-lubricated, oil-cooled gyrators induce flow and eliminate bridging and ratholing.
Paddle action gently massages material down into the metering screw, eliminating ratholing and bridging, while conditioning material into a uniform bulk density.
Problems with arching and ratholing in bins and hoppers can lead to erratic flow or complete flow stoppages.
Limiting (worst-case) conditions for ratholing can be encountered after storage and hold periods, which are typically a part of manufacturing operations handling powder blends in bins.