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STANDING COMMITTEES. Executive. CHARLES F. RAND, Chairman. JAMES F. KEMP, JOSEPH W. RICHARDS, ALBERT R. LEDOUX, BENJAMIN B. THAYER. Membership. BENJAMIN B. THAYER, Chairman. WALTER R. INGALLS, JOHN H. JANEWAY, JR., JOHN D. IRVING, HERMAN A. PROSSER. Finance. EDWARD L. YOUNG, Chairman. KARL EILERS, JAMES GAYLEY. Library. JAMES F. KEMP, Chairman. JOHN HAYS HAMMOND,3 E. GYBBON SPILSBURY,2 ALEX. C. HUMPHREYS,4 BRADLEY STOUGHTON.

Jan 9, 1913

Most lead-zinc mines worldwide have moved to further mechanized techniques to boost productivity, improve safety, and lower costs. The mining session, chaired by S. C. Fall, NL. Industries, and C. J. Beattie, Callahan Mining Co., reviewed mining methods at five operations in the US, Australia, Peru, and Japan. Where massive sulfide-type and irregular ore bodies are encountered, resourceful operators have modified and varied the mining method with the localized ore zones. In all cases, mechanization of operations has registered gains in productivity.

Jan 11, 1977

By R. J. Lytle, E. F. Laine

The in situ high frequency electrical conductivity and permittivity of Colorado oil shale were recently measured. The measurements were made at 45 MHz (45 million cps) by transmitting from one borehole to two receiving boreholes, all boreholes in line. A differential measurement using the received signals was used to calculate the conductivity and permittivity.

Jan 1, 1983

By William E. Ford, Edward Salisbury Dana

274. The PHYSICAL CHARACTERS of minerals fall under the following heads : I. Characters depending upon Cohesion and Elasticity - viz., cleavage, fracture, tenacity, hardness, elasticity, etc. 11. Specijic Gravity, or the Density compared with that of water. 111. Characters depending upon Light - viz., color, luster, degree of trans- parency, special optical properties, etc. IV. Characters depending upon Heat -viz., heat-conductivity, change of form and of optical characters with change of temperature, fusibility, etc. V. Characters depending upon Electricity and Magnetism. VI. Characters depending upon the action of the senses-viz., taste, odor, feel.

Jan 1, 1922

Jan 1, 1937

By Joseph W. Siefke

Jan 1, 1985

Iron and Steel ALBERT SAUVEUR, Chairman. A. A. STEVENSON. Vice-Chairman. HERBERT M. BOYLSTON, Secretary, Abbot Bldg., Harvard Sq., Cambridge, Mass. GUILLIAEM AERTSEN, HENRY M. HOWE, E. GYBBON SPILSBURY, JOHN BIRKINBINE. ROBERT W. HUNT, J. 8. UNGER, WILLIAM H. BLAUVELT, J. E. JOHNSON, JR.. FELIX A. VOGEL, CHARLES A. BUCK, CHARLES KIRCHHOFF, LEONARD WALDO, ERNEST F. BURCHARD, RICHARD MOLDENKE. WILLIAM R. WALKER, FRANK D. CARNEY, CHARLES F. RAND, WILLIAM R. WEBSTER JAMES GAYLEY, JOSEPH W. RICHARD$, FREDERICK W. WOOD. HENRY D. HIBBARD, C. F. W. RYS,

Jan 1, 1917

By W. E. Coughlin, R. L. Faverty, F. H. Lightner

The intent of this paper is to present the general strategy and method of implementation to achieve a "fast-track" mine development. The major objectives of a "fast-track or rapid development schedule are to minimize front-end development expenditures and to realize an early cash flow from operations. The Borealis project of Houston International Minerals Corp. (HIMCO) is used as the working example to illustrate the development schedule. Borealis is a 2.9 kt/d (2,500 stpd) gold-silver heap leach operation near Hawthorne, NV.

Jan 1, 1984

Jan 1, 1913

Jan 1, 1912

By M. E. Herrera

The use and effectiveness of sealants in under-ground mines is a recognized and well accepted practice by many people in the mining industry. Their use however in many cases is to correct, or attempt to correct, problems that might have been avoided with sealant use in the early stages of development, and continued thereafter.

Jan 1, 1982

By R. N. Stevens

Any consideration of the errors involved in determination of ?gb by previous workers should discuss their experimental methods in terms of the appropriate theoretical equation; this the authors have not done in a number of cases. To facilitate the present

Jan 1, 1969

STANDING COMMITTEES. Executive. CHARLES F. RAND, Chairman., JAMES F. KEMP, JOSEPH W. RICHARDS, ALBERT R. LEDOUX, BENJAMIN B. THAYER. Membership. BENJAMIN B. THAYER, Chairman. WALTER R. INGALLS, JOHN H. JANEWAY, JR., JOHN D. IRVING, HERMAN A. PROSSER. Finance. EDWARD L. YOUNG, Chairman KARL EILERS, JAMES GAYLEY. Library. JAMES F. KEMP, Chairman.1 JOHN HAYS HAMMOND 3 E. GYBBON SPILSBURY,2 ALEX. C. HUMPHREYS 4 BRADLEY STOUGHTON.

Jan 6, 1913

Jan 1, 1939

David THOMAS 1871 R. W. RAYMOND 1872-1874 A. L. HOLLEY 1875 ABRAM S. HEWITT 1876 T. STERRY HURT 1877 ECKLEY B. COKE 1878-1879 WILLIAM P.SHINN 1880 WILLIAM METCALF 1881 RICHARD P. ROTHWELL 1882 ROBERT W. HUNT 1883 JAMES C. BAYLES 1884-1885 ROBERT H. RICHARDS 1886 THOMAS EGLESTON 1887 WILLIAM B. POTTER 1888 RICHARD PEARCE 1889 ABRAM S. HEWITT 1890 JOHN BIRKINBINE 1891-1892

Jan 1, 1929

Jan 1, 1948

By William L. Swager

This is the second in Mining Engineering's series of articles on sources, uses, production, and conservation of strategic minerals. "Cobalt" first in the series, appeared in February 1951.

Jan 5, 1951

At a meeting of the Board of Directors, held Jan. 21, 1916, the following resolution was adopted: Resolved, that this Board has learned with indignation and sorrow of the unprovoked and brutal murder of 18 American citizens on January 10, in the State of Chihuahua, Mexico, and laments especially the death of Messrs. C. R. Watson, C. A. Pringle, H. C. Hase, and W. J. Wallace, who were members of the American Institute of Mining Engineers. As these men and their companies were engaged, in the lawful prosecution of their work, we trust that nothing will be allowed to prevent or delay appropriate action by our Government concerning the outrage by which they lost their lives;

Jan 3, 1916

By M. J. Scoble, W. J. P. Leigh

This paper aims to characterise the forms of slope instability incident in surface coal mines in Britain. These are related to observed controlling factors, with particular reference being given to slope geometry and structure. The work is based on specific data collection programmes considering actual stable and unstable mine slopes. Reference is made to field examples.

Jan 1, 1982

By P. A. Freeman, T. W. Healy, D. R. Dixon, L. O. Kolarik, D. N. Furlong

The effect of water, acid and alkali washing on the surface properties of natural magnetite were investigated by microelectro-phoresis. The general control on the isoelectric point ([i]ep) of the natural magnetite that is effected by colloidal and adsorbed silicate species can be reversed by various acid/alkali washing procedures. Added aqueous silicate and aluminium ions lower and raise the [i]ep to values consistent with hydrous silica and alumina coatings respectively.

Jan 1, 1980