In mining law. An underground passage driven horizontally along the course of a mineralized vein or approximately so. Distinguished from "shaft'' which is an opening made at the surface and extending downward into the earth vertically, or nearly so, upon the vein or intended to reach it; and from "tunnel," which is a lateral or horizontal passage underground intended to reach … [Read more...]
DRIFT
TheLaw.com Law Dictionary & Black's Law Dictionary 2nd Ed.