Except as otherwise provided by this chapter, the Secretary is directed to promulgate final regulations for the implementation of the [1] chapter within eighteen months from November 28, 1990 . All regulations promulgated pursuant to this chapter shall be developed by the Secretary with the participation of the affected Indian tribes. ( Pub. L. 101–630, title III, § 319 , Nov. 28, 1990 , 104 Stat. 4544 .) CFR Title Parts 25 163