PUBLIC LAWS-CH. 724-AUG. 1, 1946 opinion of the Commission are unimportant or the reporting of which will discourage independent prospecting for new deposits. Source materials. (5) ACQUISITION.- The Commission is authorized and directed to purchase, take, requisition, condemn, or otherwise acquire, supplies of source materials or any interest in real property containing deposits of source materials to the extent it deems necessary to effectuate the provisions of this Act. Any purchase made under this paragraph may be made without regard to the provisions of section 3709 of the Po, p.809 . Revised Statutes (U. S . C., title 41, sec. 5) upon certification by the Commission that such action is necessary in the interest of the common defense and security, or upon a showing that advertising is not reason- ably practicable, and partial and advance payments may be made Guaranteed prices. thereunder. The Commission may establish guaranteed prices for all source materials delivered to it within a specified time. Just com- pensation shall be made for any property taken, requisitioned, or condemned under this paragraph. (6) EXPLORATION.- The Commission is authorized to conduct and enter into contracts for the conduct of exploratory operations, inves- tigations, and inspections to determine the location, extent, mode of occurrence, use, or conditions of deposits or supplies of source mate- rials, making just compensation for any damage or injury occasioned thereby. Such exploratory operations may be conducted only with the consent of the owner, but such investigations and inspections may be conducted with or without such consent. (7) PrUBLI LANDS. -Al l uranium, thorium, and all other materials determined pursuant to paragraph (1) of this subsection to be peculiarly essential to the production of fissionable material, con- tained, in whatever concentration, in deposits in the public lands are hereby reserved for the use of the United States subject to valid claims, rights, or privileges existing on the date of the enactment of this Act: rdividual benefit, Provided, however, That no individual, corporation, partnership, or association, which had any part, directly or indirectly, in the develop- ment of the atomic bomb project, may benefit by any location, entry, or settlement upon the public domain made after such individual, corporation, partnership, or association took part in such project, if such individual, corporation, partnership, or association, by reason of having had such part in the development of the atomic bomb proj- ect, acquired confidential official information as to the existence of deposits of such uranium, thorium, or other materials in the specific lands upon which such location, entry, or settlement is made, and subsequent to the date of the enactment of this Act made such loca- tion, entry, or settlement or caused the same to be made for his, its, tRervaton of ma- or their benefit. The Secretary of the Interior shall cause to be inserted in every patent, conveyance, lease, permit, or other authorization hereafter granted to use the public lands or their mineral resources, under any of which there might result the extraction of any materials . toso reserved, a reservation to the United States of all such materials, prpght oet U. twhether or not of commercial value, together with the right of the United States through its authorized agents or representatives at any time to enter upon the land and prospect for, mine, and remove the same, making just compensation for any damage or injury occa- Use of lands. sioned thereby. Any lands so patented, conveyed, leased, or otherwise disposed of may be used, and any rights under any such permit or authorization may be exercised, as if no reservation of such materials had been made under this subsection; except that, when such use results in the extraction of any such material from the land in quan- tities which may not be transferred or delivered without a license under this subsection, such material shall be the property of the Com- mission and the Commission may require delivery of such material to it by any possessor thereof after such material has been separated 762 [60 STAT.