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IRON AND STEEL COMMITTEE. ALBERT SAUVEUR, Chairman. A. A. STEVENSON, Vice-Chairman. HERBERT M. BOYLSTON, Secretary, Abbot Bldg., Cambridge, Mass. John Birkinbine, William Kelly, J. S. Unger, William H. Blauvelt, Charles Kirchhoff, Felix A. Vogel,. James Gayley, Richard Moldenke, Leonard Waldo, Henry D. Hibbard, Joseph W. Richards, William R. Walker, Henry M. Howe, C. F. W. Rys, William R. Webster, Robert W. Hunt, E. Gybbon Spilsbury, Frederick W. Wood: J. E. Johnson, Jr.,

Jan 12, 1913

By G. A. REINHA

GEO. F. COMSTOCK,* Niagara Falls, N. Y. (written discussion?).-On studying this paper it has occurred to the writer that possibly it was the drilling of the test cores that produced the strains which affected in-juriously the authors' unrested bars. They found that the machining had only a slight effect, but did they also investigate the effect of the drilling by trying rest applied to the bloom sections before the cores were drilled from then? The writer has heard of a similar effect of rest after machining on test bars from castings, and it would seem more reasonable that the ductility was increased because the rests relieved strains pro-duced in chilling the test cores from the blooms, than because of any peculiar combination of solidification and rolling strains in the blooms which did not exist in smaller billets.

Jan 11, 1919

By J. C. Kerkering, J. C. Franklin, T. O. Meyer, R. W. McKibbin

A continuous survey of radon gas was made in two interconnecting stopes in a southwestern U. S. uranium mine to determine how the various phases of the mining cycle affected the radon concentration. The radon was monitored continuously with five detectors. One detector monitored the intake air, one the exhaust air, and three the stope air. The radon concentrations present during slushing, blasting, and exhaust fan shutoff were compared with concentrations on a nonwork day as a base level. Inside the stope, the radon concentration increased about 40% during slushing and 425% after blasting. Intake air radon increased 1600% and the stope air increased 550% while the surface exhaust fan was off.

Jan 1, 1979

Gardner I?. Williams, authority on diamond mining, died at San Francisco, Cal., on Aug. 22, after an illness of nearly a year. Mr. Williams, who was in his eighty-first year, was born in Saginaw, Mich. He was graduated from the University of California in 1865, and afterward took a course at the Freiberg Mining Academy in Saxony. He was awarded the degree of LII. D. by the University of California in 1910, and Doctor of Engineering by the University of Michigan in 1917. Beginning in 1870, Mr. Williams spent two years as assistant assayer at the United States Mint in San Francisco. He successfully developed

Jan 1, 1923

By W. Robert Power

Petrographically these range from true granite and syenite to gabbro and anorthosite. Commercial limestone is any sedimentary rock composed predominantly of the minerals calcite and/or dolomite. Commercial marble is any crystalline rock composed predominantly of calcite, dolomite or serpentine that is capable of taking a polish. Marble comes in a wide variety of color, texture and pattern. Many commercial marbles are unmetamorphosed limestone, to the geologist or petrologist but if they take a polish, are classified as marble.

Jan 6, 1972

By H. Firmstone

Deposits of cadmia, or impure oxide of zinc, are of common occurrence in the upper parts of blast furnaces using ores containing zinc, and were very common in the charcoal furnaces of Virginia working the brown hematite ores found near the Cadent black slate. These deposits were known to the old charcoal founders as "sulphur rings," and the characteristic green flame of burning zinc frequently to be seen at the tymp of furnaces working ores containing zinc, was held by them to indicate the presence of a "sulphur fall." When zinc is burning in considerable quantities at the tymp, the

Jan 1, 1879

By Alan D. Hoagland

The Flat Gap mine, are important zinc deposit of the Appalachian type, is located in the Copper Ridge Belt in the Valley of Tennessee approximately 30 miles northeast of the Mascot-Jefferson City zinc district (Fig. 1). The ore is found in large stratigraphically linked deposits in solution and collapse breccias of the Kingsport, Longview and, to a minor extent, Mascot formations of Lower Ordovician age. The principal ore mineral is sphalerite and the principal gangue minerals are dolonmite and accessory pyrite. There is local minor galena and very rare barite and fluorite.

Jan 10, 1962

The primary purpose of the Institute is to advance the technologic and engineering arts embraced by it through interchange of knowledge. This can best be done by the presentation and discussion of technical papers by its members. Short practical papers are especially welcome. An author should always satisfy himself that his material is of a quality that will be a credit to him and to the Institute. The preparation of a good paper frequently leads to a reorientation of the author's thoughts, and publication contributes much to the professional standing of the author. Members are urged to submit papers presenting the results of their work. Attention to the following suggestions will greatly further the prompt and efficient handling of manuscripts.

Jan 1, 1944

Gardner I?. Williams, authority on diamond mining, died at San Francisco, Cal., on Aug. 22, after an illness of nearly a year. Mr. Williams, who was in his eighty-first year, was born in Saginaw, Mich. He was graduated from the University of California in 1865, and afterward took a course at the Freiberg Mining Academy in Saxony. He was awarded the degree of LII. D. by the University of California in 1910, and Doctor of Engineering by the University of Michigan in 1917. Beginning in 1870, Mr. Williams spent two years as assistant assayer at the United States Mint in San Francisco. He successfully developed

Jan 1, 1923

By James B. Fletcher

Leaching of the block caved mine from 1941 through 1970 is described, and the improvements made are listed. Detailed is the increased knowledge of leaching gained through this operation, including methods used in forecasting production, prediction of the economical end point, rate of recovery, and ultimate recovery.

Jan 1, 1972

By J. F. Kemp

The death, on the 30th of May, 1896, at Paris, of the venerable Gabriel Auguste Daubrée, an honorary member of the Institute, recalls with emphasis the great value of his varied contributions to geology, mineralogy and hydrology. In fact, more and more as the years pass, and as attention is given to the obscure problems of metamorphism, of the development of joints, of slaty cleavage, of schistosity, of fault-systems, of the subterranean circulations of water, and of many other agencies which are often closely involved in the production of ore-bodies, the appreciation of his work increases, and quotations from his papers are made. Daubrde was born June 25, 1814, at Metz. After receiving

Jan 1, 1897

Coal Division Industrial Minerals Division Minerals Beneficiation Division Mineral Economics Division Mineral Industry Education Division Mining, Geology and Geophysics Division MINING BRANCH AND DIVISIONS OFFICERS AND COMMITTEES Council Ralph E Kirk, '55, Chairman (Coal). C M Cooley, Secretary, M D Cooper, '56 (Coal), Harold Bannennan. '55 (Ind Min Div ). R C Stephenson, '56 (Ind Min Div ) , E P Pfleider, '55 (MGGD) . J D Forrester. '56 (MGGD) , Donald W Scott, '55 (MBD). S D Michaelson, '56 (MBD). J K Richardson (MED). J R Van Pelt, Jr (MIED) COAL DIVISION Established as a Division September 20, 1929 M D Cooper. Chairman H F Yancey, Chairman-elect David R Mitchell, Secretary-Treasurer Professor of Mining The Pennsylvania State University State College. Pennsylvania

Jan 1, 1954

By Young C. Kim, William C. Cassun

A proper economic analysis of pit slope design must reflect the trade-off between the benefits and the increased risk of slope failure inherent in steeper slope angles. This paper describes the results of a case study in which a newly developed probabilistic economic analysis procedure was applied to the selection of a pit slope design at a large porphyry copper mine in the southwestern U.S. The paper also demonstrates the availability of the required data such as the probability of failure schedule and cost of failure models, under "real-life" conditions.

Jan 1, 1978

IRON AND STEEL COMMITTEE ALBERT SAUVEUR, Chairman A. A. STEVENSON, Vice-Chairman HERBERT M. BOYLSTON, Secretary, Abbot Bldg., Cambridge, Mass. Guilliaem Aertsen, Henry M. Howe, E. Gybbon Spilsbury, John Birkinbine, _Robert-W. Hunt, J, S. 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, F. D. Carney, Charles F. Rand, William R. Webster, James Gayley, Joseph W. Richards, Frederick W. Wood. Henry D. Hibbard, C. F. W. Rys, There will be a meeting of the Institute in Pittsburg on Oct. 8, 9, and 10, 1914. This meeting will be under the joint auspices of the Iron and Steel Committee, the Committee on Coal and Coke, and the Committee on Petroleum and Gas. The iron and steel papers will probably be presented on Oct. 8. The following papers have been received and accepted and will be read at the October meeting.

Jan 6, 1914

By C. R. Boyd

Without attempting to do more than give a preliminary or skeleton report upon the geology and minerals of Southwestern Virginia at this time, I am led to hope that the great commercial importance of the sixty miles of cross-section here crudely treated of

W. McA. JOHNSON.-My idea is simply that a very large excess of coal is ordinarily used as the reducing Material in a zinc charge.. By fine-grinding you increase the surface, and by adding some agent like sawdust or small pieces of wood, or cotton stalks, the charge is made porous., However, the fineness of the ore and of the coal makes the charge, a very poor conductor of heat, and therefore it has to be briquetted. 0. C. RALSTON, Niagara -Falls, N. I'.-The present large, tonnage of flotation concentrate handled by the zinc smelters is often a considerable embarrassment -to them. Nearly all of them complain of the great amount of flue-dust formed during the roasting of this material. This would suggest that it is necessary to briquette, or otherwise agglomerate flotation concentrate before it is .placed in the roasting furnace, although Mr. Johnson's particular proposal merely involves briquetting after

Jan 4, 1918

POSITIONS VACANT (Under this heading will be published notes sent to the Secretary of the Institute by members or other persons.) A copper company in Arizona desires a young engineer to assist the superintendent and take charge of the surveying, sampling and assaying. A graduate mining engineer with a few years' experience in mine surveying and sampling preferred. Salary, $125 to start. No. 10. A company in Quebec desires a metallurgist familiar with copper smelting to remodel an old plant and carry on experimental work to determine whether its ore can be smelted profitably in the district. No. 11. A foundry making a specialty of medium and light weight. steel castings of high grade waists a competent man as assistant manager capable of taking complete charge of production in the absence of the general manager. No. 12.

Jan 3, 1914

By V. D. Perry

AS the traveler approaches Chuquicamata from the seaport of Antofagasta, crossing in a northeasterly direction the 150 miles of coast range and completely barren pampa with its low, rolling hills and broad depressions, the gradual rise to an elevation of 9000 ft is imperceptible, and it is hard to realize that the smoothly contoured hills east and west of the mine are from 10,000 to 11,000 ft above the level of the sea. The deceptive monotony of the scene is relieved only by the background of an unbroken line of lofty volcanic peaks, part of the Andean Cordillera, which rise, snow covered, against the eastern skyline. The drab geographical foreground is matched by the geological monotony of unaltered, gray rock

Jan 1, 1952

By John J. Elango

Strain gage load cells, the most widely used type of nonmechanical weight sensor, are capable of taking measurements between 0.45-4.5 million kg (1-1 million lb) with an accuracy of 0.05%. They are available in a wide range of standard capacities, configurations, and accuracies, and special load cells may be custom-manufactured to meet unusual requirements. Typical applications include automated batch processing, process monitoring and control, mixing of powders and liquids, weighing coal or other materials in silos, and in large platform systems that weigh trucks and railcars. Because the strain gage load cell produces an electrical signal proportional to the applied load, it readily interfaces with readouts, keyboards, computer terminals, and alarm systems.

Jan 6, 1979

By Paul L. Allsman

Butte mining district contains extensive manganese vein deposits forming a peripheral zone. Oxidation in the veins studied usually extends to a depth of about 75 ft. Secondary minerals formed by oxidation were found to be ramsdellite-always accompanied by intermixed pyrolusite-and cryptomelane. Enrichment of the gossan is accomplished by reduction of weight upon oxidation; theoretical enrichment is 32.2 pct. Additional enrichment is caused by leaching of soluble minerals, particularly calcium and magnesium carbonates. Butte mining district contains extensive manganese vein deposits in the outer zone, surrounding the copper and zinc deposits and corresponding to the well known silver zone. This article describes the mineralogy of the manganese veins, the oxidation and enrichment processes, and the use of this information in prospecting.

Nov 1, 1956