GSA delegates authority to the Secretary of the Interior to—

(a) Maintain custody, control, and accountability for mineral resources in, on, or under Federal real property that the Administrator or his designee occasionally designates as currently utilized, excess, or surplus to the Government's needs;

(b) Dispose of mineral resources by lease and to administer those leases that are made; and

(c) Determine that Federal agencies do not need Department of the Interior controlled excess real property and related personal property with an estimated fair market value, including all components of the property, of less than $50,000; and to dispose of the property by means most advantageous to the United States.