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Arizona FRANK A. WARDLAW, JR., Chairman GRANT R. RUBLY, Secretary-Treasurer Miami Copper Co., Box 505, Miami, Ariz. MICHAEL CURLEY C. R. KUZELL BURRELL R. HATCHER A. MENDELSOHN WILLIAM KOERNERA. C. REIFSNIDER Black Hills L. B. EAMES, Chairman ALEXANDER J. M. Ross, First Vice-Chairman FRANCIS CHURCH LINCOLN, Second Vice-Chairman NATHANIEL HERZ, Secretary-Treasurer Lead, S. D. JOSEPH P. CONNOLLY C. N. KRAVIG C. E. DAWSON EDWARD L. TULLIS

Jan 1, 1939

By Edward F. Fitzhugh

QUANTITATIVE appraisal of the chances of finding various tonnages and grades of ore clarifies any exploratory development proposal. Ways are discussed of appraising chances in conformance with probability principles, and graphs are suggested to show tonnages, grades and the corresponding judged expectancies.

Jan 1, 1947

Jan 1, 1962

By C. E. Shoenfelt

The outstanding development in Colorado in 1938 was the completion of the discovery well of the Wilson Crcek structure in Rio Blarlco County, on the western slope in the northwest corner of Colorado. Last year the Transactions (volume 127) carried an account of the discovery of oil in the Morrison sand in the Wilson Creek structure, in the joint test by The Texas Company and The California Company. This important

Jan 1, 1939

Jan 1, 1923

By Blair R. Benner, Ronald J. Roman

The rate of acid leaching of malachite from a sandstone ore was shown to be controlled by the diffusion of H+ ions through the host rock. The kinetics of the reaction can be expressed by a shrinking core model. Equations for calculating effective diffusivities from an "infinite" slab and a cylindrical core were derived. The effective diffusivity, of H+ ions in a sandstone ore was measured.

Jan 1, 1975

CLARENCE N. FENNER.-Mr. Gelstharp, chief chemist of the Pitts-burgh Plate Glass Co., has directed my attention to the fact that that company was using optical pyrometers obtained from the Leeds & Northrup Co. several months before the members of the Geophysical Laboratory arrived at Charleroi. I am glad to make this correction. The chief object of my paper was to emphasize the necessity of careful temperature control in the making of optical glass and to describe the kind of tests to which an optical pyrometer should be subjected at a glass plant in order to obtain information regarding the closeness with which its readings correspond with true temperatures under the condi-tions which prevail in each particular case.

Jan 12, 1919

By Herbert H. Mellus

TODAY the tractor-drawn carryall scraper has a very important role in the Open Pit div. of Inspiration Consolidated Copper Co. Carryalls have already moved over 3 million tons of material at costs comparable to or lower than for conventional truck and shovel operation, and a major program of scraper stripping and ore production schedules has developed from early isolated scraper applications.

Jan 10, 1953

I-Institute of Metals Division* PAUL D MERICA, Chairman ZAY JEFFRIRS, Vice-chairman W M CORSE, Secretary Executive Committee T R FREEMAN JR, Local Section S SKOWRONSKI, Papers Committee R S ARCHER Non-ferrous Data Sheets H C JENNISON, Membership Committee C BAIN, Journal Committee L W SPRING Local Section Committee J R FREEMAN, JR, Chairman R J ANDERSON Cincinnati R L DOWDELL Minneapolis R S WILLIAMS, Boston H CLAMER, Philadelphia W A SCHEUCH, Chicago R F WOOD, New York Papers Committee S SKOWRONSKI, Chairman H S ARCHER-Aluminum W K FRANK-BRONZE F W HARRIS-Copper H BASSETT-BRASS G O HIERS-Lead Alloys M CORSE-White Nickel Base Alloys PAUL D MERICA-Nickel

Jan 1, 1923

Jan 1, 1937

Jan 1, 1931

EXECUTIVE COMMITTEES OF LOCAL SECTIONS Arizona E. P. MATHEWSON, Chairman W. V. DECAMP, First Vice-chairman F. W. MACLENNAN, Second Vice-chairman E. D. GARDNER, Secretary-Treasurer, U. S. Bureau Of Mines, Tucson, Ariz. MICHAEL CURLEY J. P. HODGSON HENRY F.1 ASTER CLYDE E. WEED Boston Meets first Monday each winter month GEORGE A. PACKARD, Chairman FRANKLIN B. RICHARDS, Vice-chairman F. LEROY FOSTER, Secretary-Treasurer Rooms 8-219 Mass. Inst. of Tech., Cambridge, Mass. G. W. METCALFE D. H. MCLAUGHLIN

Jan 1, 1932

By Lap-yan Chan

Chan and Goodman (1983) presented a procedure for simulating joint traces and identifying key blocks on an excavation. This paper defines six measures of support requirements that characterize the number and dimensions of key blocks, taking into account the frictional properties of joints and actions of support systems. When correlated with case histories, these measures of support requirements can help in choosing an optimal design for shallow excavations in discontinuous hard rocks.

Jan 1, 1984

By John W. Hughes

During the course of any truck loading operation, it will become necessary to replace hauling and loading units. Timing of replacement can be selected on the basis of necessity, or guesswork, or on a schedule derived from past performance records. Replacing units too soon results in high capital costs per hour. Waiting too long results in high maintenance costs per hour. As with any phase of a mining operation, a planned schedule can reduce overall costs and keep breakdowns within reason.

Jan 10, 1976

By E. C. Felton

At the Pennsylvania Steel Works, Steelton, Pa., a series of trials has been made with oil as fuel in steel-heating and open-hearth steel-furnaces with the following results : First Trial.—Hot 14-inch ingots, six to a charge, were heated in two Siemens' heating furnaces in the blooming mill, the oil being put in first in March, 1888. The oil used had been partly refined, so that the paraffine and some of the naphtha were removed. During a run of six weeks the consumption of oil was about 61/2 gallons per ton of blooms, including the oil required to keep the furnace hot over Sunday.

Jan 1, 1889

Jan 1, 1937

PRESIDENT AND DIRECTOR JOHN M. LOVEJOY NEW YORK, N. Y. PAST PRESIDENTS AND DIRECTORS HOWARD N. EAVENSON PITTSBURGH, PA. HENRY A. BUEHLER ROLLA, Mo. VICE-PRESIDENT, TREASURER AND DIRECTOR KARL EILERS NEW YORK, N. Y. VICE-PRESIDENTS AND DIRECTORS LOUIS S. CATES NEW YORK, N. Y. PAUL D. MERICA NEW YORK, N. Y. WILFRED SYKES CHICAGO, ILL. R. C. ALLEN CLEVELAND; OHIO HENRY KRUMB NEW YORK, N. Y.

Jan 1, 1936

REPORT OF PRESIDENT C. F. RAND FOR THE YEAR 1917 The noteworthy occurrences during 1917 were the creation of Engineering Council; the completion of the addition to the Engineering Societies Building. and the occupation by the American Society of Civil engineers of the space thus provided for it; the addition of 67,000 vol-

Jan 3, 1918

ARIZONA Established July 10, 1915 ROBERT W. THOMAS. Chairman ROBERT W. HUGHES, Vice-Chairman HUBERT O. WOODS. Secretary-Treasurer American Smelting & Refining CO., Hayden, Ariz. FRANK A. WARDLAW, JR., National Director THEODORE BROOKS I H. C. HENBIE THOMAS C. CHAPMAN P. D. I. HONEYMAN CARL H. COLE JOHN E. LANNING JOHN H. DAVIS ALBERT MENDELSOHN EDWARD G. DENTZER BRENT N. RICKARD MORRIS G. FOWLER F. A. WARDLAW, JR.

Jan 1, 1942

Calculation of the Cap from Torsion-balance Data, Hoskins Mound Salt Dome, Brazoria County, Texas BY DONALD C BARTON (Tech Pub 719 3800 words) Depth, thickness, and edge of the cap rock were calculated from the results of a torsion-balance survey of the dome The cap rock was predicted to extend 1000 to 1500 ft north and east beyond the previously surmised position of the edge of the dome Confirmation by subsequent drilling shows that the calculated depths were within 30 per cent of the true depths and for the most part within 15 per cent

Jan 1, 1937