43 C.F.R. § 3505.10 What is a prospecting permit?
Title 43 - Public Lands: Interior
(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.
Title 43: Public Lands: Interior
PART 3500—LEASING OF SOLID MINERALS OTHER THAN COAL AND OIL SHALE
Subpart 3505—Prospecting Permits
§ 3505.10 What is a prospecting permit?