36 C.F.R. § 254.6 – Segregative effect.

(a) If a proposal is made to exchange Federal lands, the authorized officer may request the appropriate State Office of the Bureau of Management (BLM) to segregate the Federal lands by a notation on the public land records. Subject to valid existing rights, the Federal lands shall be segregated from appropriation under the public land laws and mineral laws for a period not to exceed 5 years from the date of record notation.
(b) Any interests of the United States in the non-Federal lands that are covered by the exchange proposal may be noted and segregated from appropriation under the mineral laws for a period not to exceed 5 years from the date of notation.
(c) The segregative effect terminates as follows:
1. (1) Automatically, upon issuance of a patent or other document of conveyance to the affected lands;
2. (2) On the date and time specified in an opening order, published in the Federal Register by the appropriate BLM State Office, if a decision is made not to proceed with the exchange or upon removal of any lands from the exchange proposal; or
3. (3) Automatically, at the end of the segregation period not to exceed 5 years from the date of notation on the public land records, whichever occurs first.