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Jan 1, 1947

By John D. Nelson

Jan 1, 1985

Jan 1, 1953

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Jan 1, 1938

[Executive HERBERT G. MOULTON, Chairman WILLIAM WRAITH, Vice-Chairman ,PAUL D. MERICA W. M. PEIRCE H. Y. WALKER Finance H. T. HAMILTON, Chairman ERLE V. DAVELER HENRY KRUMB Admissions FELIX E. WORMSER, Chairman GEORGE D. BARRON, Vice-Chairman CHESTER A. FULTON PHILIP KRAFT EDWARD MEAGHER Alternates P. B. BUCKY LLOYD C. GIBSON F. T. SISCO]

Jan 1, 1940

By Bruce Vandre

Jan 1, 1985

By F. S. McNicholas

Various methods of block caving and draw practice are classified and the advantages, disadvantages, rock, treatment, size of orebody, costs, and profit comparisons, and other factors which determine the selection of the proper method are outlined.

Jan 1, 1951

Executive SIDNEY J. JENNINGS, Chairman GEORGE D. BARRON J. E. JOHNSON, JR. EDWIN LUDLOW ROBERT M. RAYMOND Membership KARL FILERS, Chairman LEWIS W. FRANCIS J. E. JOHNSON, JR. LOUIS D. HUNTOON ARTHUR L. WALKER Finance GEORGE D. BARRON, Chairman CHARLES F. RAND BENJAMIN B. THAYER Library E. GYBBON SPILSBURY,1 Chairman ALEX C. HUMPHREYS3 GEORGE C. STONE 2 J. H. JANEWAY4 BRADLEY STOUGHTON

Jan 5, 1918

By R. J. Blackwell

By Lawrence Adler

The authors are to be complimented on using a novel and potentially helpful technique to analyze the effects of mine roof trusses. However, some criticisms of their application and analysis seem appropriate to further its acceptance. This discussion will deal with the normal structural analysis format covering: 1) material, 2) load, 3) structure, and 4) analysis. It will then briefly review the testing procedures and finally cover miscellaneous items.

Jan 12, 1978

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Jan 1, 1938

Executive SIDNEY J. JENNINGS, Chairman GEORGE D. BARRON J. E. JOHNSON, JR. EDWIN LUDLOW ROBERT M. RAYMOND Membership KARL EILERS, Chairman LEWIS W. FRANCIS J. E. JOHNSON, JR. LOUIS D. HUNTOON ARTHUR L. WALKER Finance GEORGE D. BARRON, Chairman CHARLES-F. R AND BENJAMIN B. THAYER Library E. GYBBON SPILSBURY,1 Chairman ALEX C. HUMPHREYS8 GEORGE C. STONE2 J. H. JANE WAY' BRADLEY STOUGHTON Papers and Publications BRADLEY STOUGHTON, Chairman

Jan 4, 1918

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Jan 1, 1938

By Michael J. Abrams

The large amount of data available from Landsat has made digital processing necessary to extract and display that subset of data relevant to the problem being considered. Computer image processing techniques developed and used at the Jet Propulsion Laboratory can be divided into four categories: rectification, cosmetics, display, and analysis. These techniques have been applied to various geologic problems, including mineral exploration, lithologic mapping, hydrology, and tectonics.

Jan 1, 1977

By R. E. Zimmerman, Shiou-Chuan Sun

An evaluation of the mechanism surrounding the froth flotation of coarse coal and mineral particles as a result of experiments conducted at The Pennsylvania State College. Maximum size ranges for both bituminous and anthracite coals were established as well as the factors affecting the floating of coarse particles.

Jan 5, 1950

Jan 1, 1889

Jan 3, 1976

By Jack A. Caldwell

Jan 1, 1985

Jan 1, 1892

Jan 6, 1953