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 62 STAT.] 80TH CONG., 2D SESS.-CH. 379-JUNE 3, 1948 permit suspension of operations under any such leases when market- ing conditions are such that the leases cannot be operated except at a loss." SEC. 4. Section 11 of the Act (41 Stat. 440, 30 U. S. C., sec. 213) is hereby amended to read as follows: "SEC. 11. Any lease to develop and extract phosphates, phosphate rock, and associated or related minerals under the provisions of sec- tions 9 to 12, inclusive, of this Act shall provide that the lessee may use so much of any deposit of silica or limestone or other rock situated on any public lands embraced in the lease as may be utilized in the processing or refining of the phosphates, phosphate rock, and asso- ciated or related minerals mined from the leased lands or from other lands upon payments of such royalty as may be determined by the Secretary of the Interior, which royalty may be stated in the lease or, as to the leases already issued, may be provided for in an attach- ment to the lease to be duly executed by the lessor and the lessee." SEC. 5. Section 12 of the Act (41 Stat. 441, 30 U. S . C., sec. 214) is amended to read as follows: "SEC. 12 . The holder of any lease issued under the provisions of sections 9 to 12, inclusive, of this Act shall have the right to use so much of the surface of unappropriated and unentered public lands not a part of his lease, not exceeding eighty acres in area, as may be determined by the Secretary to be necessary or convenient for the extraction, treatment, and removal of the mineral deposits, but this provision shall not be applicable to national forest lands." SEC. 6. The first sentence of section 27 of such Act, as amended (41 Stat. 448, 30 U. S . C ., sec. 184), is amended to read as follows: "No person, association, or corporation, except as herein provided, shall take or hold coal or sodium leases or permits during the life of such lease in any one State, exceeding in the aggregate acreage five thousand one hundred and twenty acres for each of said minerals: Provided, That the Secretary of the Interior may, in his discretion where it is necessary in order to secure the economic mining of sodium compounds leasable under this Act, permit a person, association, or corporation to take or hold sodium leases or permits for up to fifteen thousand three hundred and sixty acres in any one State. No person, association, or corporation, except as herein provided, shall take or hold at one time oil or gas leases exceeding in the aggregate fifteen thousand three hundred and sixty acres granted hereunder in any one State; and no person, association, or corporation shall take or hold at one time phosphate leases or permits exceeding in the aggregate five thousand one hundred and twenty acres in any one State, and exceed- ing in the aggregate ten thousand two hundred and forty acres in the United States." SEC. 7 . The first sentence of section 39 of such Act of February 25, 1920, as amended (47 Stat. 798,30 U. S . C ., sec. 209), is amended to read as follows: "The Secretary of the Interior, for the purpose of encouraging the greatest ultimate recovery of coal, oil, gas, oil shale, phosphate, sodium, potassium and sulfur, and in the interest of conservation of natural resources, is authorized to waive, suspend, or reduce the rental, or minimum royalty, or reduce the royalty on an entire leasehold, or on any tract or portion thereof segregated for royalty purposes, whenever in his judgment it is necessary to do so in order to promote develop- ment, or whenever in his judgment the leases cannot be successfully operated under the terms provided therein." SEC. 8 . The Act entitled "An Act to grant extensions of time under coal permits", approved March 9, 1928, as amended (45 Stat. 251, 30 U. S . C., sec. 201a), is hereby repealed. 291 Use of silica or lime- stone deposits. Ante, p. 290; supra; infra. Use of surface of other lands. Ante, p. 290; supra. Ante, p. 285. Restrictionson hold- ings. Coal or sodium. Oil or gas. Phosphate. Waiver, etc., of rent- al or royalty. Repeal.

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