As used in this chapter “mineral leasing laws” shall mean the Act of October 20, 1914 (38 Stat. 741
); the Act of February 25, 1920 (41 Stat. 437
et seq.]; the Act of April 17, 1926 (44 Stat. 301
et seq.]; the Act of February 7, 1927 (44 Stat. 1057
et seq.]; and all Acts heretofore or hereafter enacted which are amendatory of or supplementary to any of the foregoing Acts; “Leasing Act minerals” shall mean all minerals which, upon August 11, 1955, are provided in the mineral leasing laws to be disposed of thereunder; “lignite” shall mean coal classified as ASTM designation: D 388–38, according to the standards established in the American Society for Testing Materials on Coal and Coke under standard specifications for Classification of Coals by Rank, contained in public-land deposits considered as valuable under the coal-land classification standards established by the Secretary of the Interior and prescribed in section
, Code of Federal Regulations, part 201; and “source material” shall mean uranium, thorium, or any other material which is determined by the Atomic Energy Commission pursuant to the provisions of section
to be source material.