(a) Appeals from BIA decisions under this part may be taken under part 2 of this chapter, except our decision to disapprove a right-of-way grant or any other right-of-way document may be appealed only by the applicant or an Indian landowner of the tract over or across which the right-of-way was proposed.

(b) For purposes of appeals from BIA decisions under this part, “interested party” is defined as any person whose land is subject to the right-of-way or located adjacent to or in close proximity to the right-of-way whose own direct economic interest is adversely affected by an action or decision.