43 CFR §3933.31

1. (a)File in triplicate at the proper BLM office a separate instrument of assignment for each assignment. File the assignment application within 90 calendar days after the date of final execution of the assignment instrument and with it include the:
   1. (1)Name and current address of assignee;
   2. (2)Interest held by assignor and interest to be assigned;
   3. (3)Serial number of the affected lease or license and a description of the lands to be assigned as described in the lease or license;
   4. (4)Percentage of overriding royalties retained; and
   5. (5)Dated signature of assignor.
2. (b)The assignee must provide a single copy of the request for approval of assignment which must contain a:
   1. (1)Statement of qualifications and holdings as required by subpart 3902 of this chapter;
   2. (2)Date and the signature of the assignee; and
   3. (3)The filing fee found in the fee schedule in § 3000.12 of this chapter.
3. (c)The approval of an assignment of all interests in a specific portion of the lands in a lease or license will create a separate lease or license, which will be given a new serial number.