36 CFR §254.6

1. (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.
2. (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.
3. (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.