494
Opinion of the Court
163, 179 (1989), the IMLA aimed to foster tribal self-determination by "giv[ing] Indians a greater say in the use and disposition of the resources found on Indian lands," BHP Minerals Int'l Inc., 139 I. B. L. A. 269, 311 (1997).
Prior to enactment of the IMLA, decisions whether to grant mineral leases on Indian land generally rested with the Government. See, e. g., Act of June 30, 1919, ch. 4, § 26, 41 Stat. 31, as amended, 25 U. S. C. § 399; see also infra, at 509 (describing § 399). Indian consent was not required, and leases were sometimes granted over tribal objections. See H. R. Rep. No. 1872, 75th Cong., 3d Sess., 2 (1938); S. Rep. No. 985, 75th Cong., 1st Sess., 2 (1937); 46 Fed. Cl. 217, 230 (2000). The IMLA, designed to advance tribal independence, empowers Tribes to negotiate mining leases themselves, and, as to coal leasing, assigns primarily an approval role to the Secretary.
Although the IMLA covers mineral leasing generally, in a number of discrete provisions it deals particularly with oil and gas leases. See 25 U. S. C. § 396b (requirements for public auctions of oil and gas leases); § 396d (oil and gas leases are "subject to the terms of any reasonable cooperative unit or other plan approved or prescribed by [the] Secretary"); § 396g ("[T]o avoid waste or to promote the conservation of natural resources or the welfare of the Indians," the Secretary may approve leases of Indian lands "for the subsurface storage of oil and gas."). The IMLA contains no similarly specific prescriptions for coal leases; it simply remits coal leases, in common with all mineral leases, to the governance of rules and regulations promulgated by the Secretary. § 396d.
During all times relevant here, the IMLA regulations provided that "Indian tribes . . . may, with the approval of the Secretary . . . or his authorized representative, lease their land for mining purposes." 25 CFR § 211.2 (1985). In line with the IMLA itself, the regulations treated oil and gas leases in more detail than coal leases. The regulations re-
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