Either party to an exchange may make reservations of timber, minerals, or easements, the values of which shall be duly considered in determining the values of the exchanged lands. Where reservations are made in lands conveyed to the United States the right to enjoy them shall be subject to such reasonable conditions respecting ingress and egress and the use of the surface of the land as may be deemed necessary by the Secretary of Agriculture; where mineral reservations are made in lands conveyed by the United States it shall be so stipulated in the patents, and that any person who acquires the right to mine and remove the reserved deposits may enter and occupy so much of the surface as may be required for all purposes incident to the mining and removal of the minerals therefrom, and may mine and remove such minerals upon payment to the owner of the surface for damages caused to the land and improvements thereon. All property, rights, easements, and benefits authorized by this section to be retained by or reserved to owners of lands conveyed to the United States shall be subject to the tax laws of the States where such lands are located.
16 U.S. Code § 486 - Exchange of lands in national forests; reservations of timber, minerals, or easements
Functions of Secretary of the Interior under this section and section 485 of this title, with respect to exchanges of non-Federal lands for national forest lands or timber, transferred to Secretary of Agriculture, see Pub. L. 86–509, June 11, 1960, 74 Stat. 205, set out as a note under section 2201 of Title 7, Agriculture.
Act June 25, 1935, ch. 308, 49 Stat. 422, provided that this section should be extended and made applicable to exchanges of lands under acts Feb. 14, 1923, ch. 75, 42 Stat. 1245, and Feb. 7, 1929, ch. 160, 45 Stat. 1154, which authorize the United States to acquire privately owned lands situated within certain townships in the Lincoln National Forest in the State of New Mexico, by exchanging therefor an equal value of unreserved and unappropriated public lands within said State.