Extralateral Rights

Extralateral rights are the statutory right of a lode claim owner to follow a vein or lode on its downward course beyond the vertical planes drawn through the side lines of the claim, provided the apex of the vein lies within the surface boundaries of the claim. This right is codified at 30 U.S.C. 26.

Statutory framework (30 U.S.C. 26): - The locators of lode claims shall have the exclusive right of possession and enjoyment of all the surface included within the lines of their locations - They possess the right to follow veins or lodes to any depth, although such veins may extend outside the vertical side lines of the surface location

Conditions for extralateral rights: - The apex of the vein must lie within the surface boundaries of the claim - The right extends only between the vertical planes drawn downward through the end lines of the claim, extended in their own direction - End lines must be parallel (or substantially so) - The claim must have been properly located

Limitations: - Rights extend only between the end line planes - Cannot follow the vein beyond the vertical end line planes - Subject to senior claim rights - Does not apply to placer claims

Practical significance: Extralateral rights can make lode claims far more valuable than their surface area suggests, as a deep-dipping vein may extend well beyond the claim's surface footprint. These rights have been the subject of extensive litigation throughout mining history.