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K

 

Kettle Bottom

A smooth, rounded piece of rock, cylindrical in shape, which may drop out of the roof of a mine without warning. The origin of this feature is thought to be the remains of the stump of a tree that has been replaced by sediments so that the original form has been rather well preserved.

 
Kerf

The undercut of a working face.

 
Keystone

A wholesaler's term, usually meaning half the marked price for a quantity purchase.

 
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