Cite as: 523 U. S. 696 (1998)
Opinion of the Court
252 U. S. 159 (1920). Surface interests in the ceded strip were thereafter conveyed to non-Indians, but the United States holds rights to minerals underlying the strip in trust for the Tribe. Since 1904, the State and the Counties of Big Horn, Treasure, and Yellowstone have exercised full legal authority and responsibility for public services on the ceded strip, and the Tribe has not exercised civil jurisdiction over this area. See Crow Tribe v. Montana, 650 F. 2d 1104, 1107 (CA9 1981) (noting the Court of Appeals' understanding, in Little Light v. Crist, 649 F. 2d 683, 685 (CA9 1981), that "the ceded area is not a part of the reservation").
In 1972, with the approval of the Department of the Interior and pursuant to the Indian Mineral Leasing Act of 1938 (IMLA), 52 Stat. 347, 25 U. S. C. § 396a et seq., Westmoreland Resources, a non-Indian company, entered into a mining lease with the Tribe for coal underlying approximately 31,000 acres of the ceded strip. After executing the 1972 lease, Westmoreland signed contracts with its customers, four Midwest utility companies, allowing Westmoreland to pass on the cost of valid taxes to the utilities. Westmore-land began mining the coal in the spring of 1974.
In November 1974, Westmoreland and the Tribe renegotiated the 1972 lease. The renegotiated royalties were recognized at the time as being among the highest in the United States. Crow Tribe v. United States, 657 F. Supp. 573, 587 (Mont. 1985); see App. 376 (testimony of Westmoreland's president that the renegotiated royalty was "by far the highest royalty that was being paid in the nation").1 A settlement agreement attending the 1974 renegotiation stated that the Tribe found the amended lease and associated documents "satisfactory in that they provide the financial, economic and social protections that the Tribe deems necessary." Id., at
1 Westmoreland's president contrasted the 35 and 40 cents per ton royalties Westmoreland had agreed to pay the Tribe with federal royalties which were "at that time . . . 17 and a half cents a ton, maybe 20 cents a ton." App. 375-376.
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