43 CFR § 30.271
How must the tribe pay for the interests it purchases?
June 11, 2020
(a) A tribe must pay the full fair market value of the interests purchased, as set forth in the appraisal or other valuation report, or as determined after hearing under §30.268, whichever is applicable.
(b) Payment must be made within 2 years from the date of decedent's death or within 1 year from the date of notice of purchase, whichever is later.