drill drift

drill drift

[′dril ‚drift]
(engineering)
A steel wedge used to remove tapered shank tools from spindles, sockets, and sleeves.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
Other mining method names are merely variations or closer definition of others (Sublevel Stoping is typically Blasthole carried out with more than one drill drift per level interval and Sublevel Retreat simply defines the direction of the mining).
This will allow each subsequent stope, downwards, to have its drill drift developed in the bottom of the fill in the stope above.