If the top or apex of the lode in its longitudinal course extends beyond the exterior lines of the claim at any point on the surface or as extended vertically downward, such lode may not be followed in its longitudinal course beyond the point where it is intersected by the exterior.
S.D. Codified Laws § 45-4-11
Longitudinal limits of claim
Source: PolC 1877, ch 31, § 10; CL 1887, § 2006; RPolC 1903, § 2541; RC 1919, § 8735; SDC 1939, § 42.0112.
Official source: South Dakota Legislature. Reproduced from public-domain South Dakota statutes; confirm against the official source for the current text. Not legal advice.