25 U.S. Code § 400a - Lease for mining purposes of land reserved for agency or school; disposition of proceeds; royalty
The Secretary of the Interior is authorized under such rules and regulations as he may prescribe, to lease at public auction upon not less than thirty days’ public notice for mining purposes land on any Indian reservation reserved for Indian agency or school purposes, in accordance with existing law applicable to other lands in such reservation, and the proceeds arising therefrom shall be deposited in the Treasury of the United States to the credit of the Indians for whose benefit the lands are reserved subject to appropriation by Congress for educational work among the Indians or in paying expenses of administration of agencies: Provided, That a royalty of at least one-eighth shall be reserved in all leases.
For transfer of functions of other officers, employees, and agencies of Department of the Interior, with certain exceptions, to Secretary of the Interior, with power to delegate, see Reorg. Plan No. 3 of 1950, §§ 1,2, eff. May 24, 1950, 15 F.R. 3174,64 Stat. 1262, set out in the Appendix to Title 5, Government Organization and Employees.