CRITICAL MATERIALS TO THE UNITED STATES HEARINGS BEFORE THE SPECIAL SUBCOMMITTEE ON MINERALS, OF THE U.S. Courres's. Senate. COMMITTEE ON INTERIOR AND INSULAR AFFAIRS EIGHTY-THIRD CONGRESS FIRST SESSION PURSUANT TO S. Res. 143 A RESOLUTION TO INVESTIGATE THE ACCESSIBILITY AND PART 1 United States Department of the Interior: Bureau of Mines OCTOBER 20, 21, 23, AND 24, 1953 Printed for the use of the Committee on Interior and Insular Affairs ЬЕМИВА 3HT UNITED STATES GOVERNMENT PRINTING OFFICE WASHINGTON: 1953 COMMITTEE ON INTERIOR AND INSULAR AFFAIRS HUGH BUTLER, Nebraska, Chairman SPECIAL SUBCOMMITTEE ON MINERALS, MATERIALS, AND FUELS ECONOMICS Blue, Hon. Delwin D., Assistant Chief, Light Metals Branch Bureau Irving, Hon. Donald R., Ceramic and Fertilizer Branch, Bureau of Johnson, Hon. Charles H., Chief of the Base Metals Branch, Bureau 12 299 249 120, 125 Josephson, Hon. G. W., Chief, Construction and Chemical Materials 277 Kline, Hon. Mitchell H., Chief, Rare and Precious Metals, Bureau of Mines, Department of the Interior.. McKay, Hon. Douglas, Secretary of the Interior. Melcher, Hon. Norwood B, Chief, Ferrous Metals and Alloys Branch, Wormser, Hon. Felix E., Assistant Secretary of the Interior. Zinner, Hon. Paul, Chief, Minerals Division, Bureau of Mines, Depart- |