25 CFR §1000.2425

1. (a)The IBIA has 15 days from the date the Secretary receives timely written objections to modify, adopt, or reverse the recommended decision. If the IBIA does not modify or reverse the recommended decision during that time, the recommended decision automatically becomes final.
2. (b)When reviewing the recommended decision, the IBIA may consider and decide all issues properly raised by any party to the appeal, based on the record.
3. (c)The decision of the IBIA must:
   1. (1)Be in writing;
   2. (2)Specify the findings of fact or conclusions of law that are modified or reversed;
   3. (3)Give reasons for the decision, based on the record; and
   4. (4)State that the decision is final for the Department.