43 C.F.R. § 3505.10 : Public Lands: Interior — REGULATIONS RELATING TO PUBLIC LANDS — BUREAU OF LAND MANAGEMENT, DEPARTMENT OF THE INTERIOR — MINERALS MANAGEMENT (3000) — LEASING OF SOLID MINERALS OTHER THAN COAL AND OIL SHALE — PROSPECTING PERMITS — What is a prospecting permit?
(a) A prospecting permit gives you the exclusive right to prospect on and explore lands available for leasing under this part to determine if a valuable deposit exists of:
(1) Phosphate;
(2) Sodium;
(3) Potassium;
(4) Sulphur;
(5) Gilsonite; or
(6) A hardrock mineral.
(b) Prospecting permits are not available for asphalt.
(c) You may remove only material needed to demonstrate the existence of a valuable mineral deposit.