In mining law. An under-ground passage driven horizontally along the course of a mineralized vein or approxl-mately so. Distinguished from “shaft,” which is an opening made at the surface and extending downward Into the earth vertically, or nearly so, npon the vein or in-tended to reach it; and from “tunnel,” which is a lateral or horizontal passage un-derground intended to reach the vein or min-eral deposit, where drifting mny begin. Jur-genson v. Diller, 114 Cal. 491, 46 Pac. 610,. 55 Am. St. Rep. 83
Source: Black’s Law Dictionary 2nd Ed (1910)
