(a) Extralateral rights under shoreland, tideland, and submerged land are confirmed and granted to an owner of a lode mining claim located before January 3, 1959, under the mining laws of the United States. (b) In this section, 'extralateral rights' means rights given to an owner of a mining claim under 30 U.S.C. 26 to follow, and mine, any vein or lode the apex of which lies within the boundaries of the location of the surface of the mining claim, notwithstanding that the course of the vein or lode on its dip or downward direction may so far depart from the perpendicular as to extend beyond the planes which would be formed by the vertical extension downwards of the sidelines of the location.
Alaska Legal Code