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Definition of rifling
i. Working coal which was left behind over the waste.
Ref: Nelson
ii. The spiral grooving in the walls of a drill hole and/or on the surface of a drill core.
Ref: Long
iii. A borehole following a spiraled course.
Ref: Long
Ref: Nelson
ii. The spiral grooving in the walls of a drill hole and/or on the surface of a drill core.
Ref: Long
iii. A borehole following a spiraled course.
Ref: Long
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New Locality Added: Kawarau River, Cromwell, Central Otago, Otago, South Island, New ZealandFrom Steve Sorrell, 25th May 2013 11:39:40