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By A. M. Gaudin, J. G. Morrow

FLOTATION requires the existence of a definite contact angle. This contact angle, the surface tension of the solution, and adsorption at the solid- fluid interface are quantitatively related. Adsorption of dodecylammonium acetate on hematite was measured for a wide range of concentrations of reagent in solution. Similar measurements for quartz have already been made.1 Contact angle measurements were then made on polished surfaces of hematite and of quartz immersed in aqueous dodecylammonium acetate solutions, and a functional relationship was sought between adsorption density at the mineral-solution interface and the contact angle. Finally, the surface tension of the aqueous amine acetate solutions was measured. These data were combined to give an evaluation of the work of adhesion for the three-phase system.

Jan 12, 1954

By Allan T. Fisk, Carl R. Peterson, Richard E. Brooks, James J. Olson

Development of a continuous drill-and-blast excavation capability in mining and high-speed tunneling has been a long recognized goal. Ideally, a machine to meet the challenge should simultaneously perform drilling, explosive loading, initiation, mucking, ventilation, and other functions while remaining at the face, since the elimination or modification of the cyclic nature of the system would significantly improve the advance rate and economy of drill-and-blast tunneling. The Rapidex continuous spiral drill-and-blast concept, one of the continuous excavation schemes presently under evaluation in the US Bureau of Mines' Bedded Deposits subprogram, utilizes an unusual blasting pattern that provides effective fragmentation and involves a partially self-shielding geometry that permits a lightly shielded machine to remain at the face during blasting.

Jan 6, 1977

By W. J. Croft, R. J. Arnott

A series of commercial titanium diboride powders have been characterized in terms of X-ray crystallography, composition, particle size distribution, and particle shape. These materials were used in sintering experiments from which the effect of impurities on the sintering temperature was observed. Transmission electron microscopic observations have been made on Ion milled and chemically milled hot pressed material. Dislocations have been observed as well as grain boundary phases. Limited bonding between grains seems to account for poor mechanical properties. Observations have been made of preferred crystallographic orientation in hot pressed material.

Jan 1, 1985

By Rudyard Kipling

Through the courtesy of the British Museum of Natural History we have received a copy of an address delivered by Rudyard Kipling at Folkestone, Feb. 15, 1918. We take pleasure in reproducing it in full, because its sentiments are just as appropriate here and now as they ever were. If you will allow me. I will tell you a story. Once upon a time, a. hundred years ago, there was a large and highly organised community in India who lived by assassination and robbery. They Were educated to it from their infancy; they followed it

Jan 9, 1918

By R. W. Shoenberger, J. A. Grina, R. J. VanPelt

The many alternatives open to coke plant operators for improving overall coke quality and strength are discussed in this paper. Programs undertaken by US Steel research and coal operations during the previous ten years to improve coke strength are described. New techniques in use, or being considered for future use, are also discussed.

Jan 1, 1982

Here are the details . . . . . of how a $2.5 million research gamble, now backed by five years of intensive development in cooperation with the Chemical Construction Corp. resulted in a hydrometollurgical process that yields pure metal powders from sulphide concentrate - a process that offers potential savings of $2.5 million a year.

Jan 6, 1953

Modern, mechanized coal mine ranks with largest in the West - plays major part in CF&I's broad expansion program

Jan 11, 1953

By Charles Fairhust

Although the term 'rock mechanics' started to become popular about the time of the First U.S. Rook Mechanics Symposium in 1956, study of the mechanical behavior of rock certainly pre-dates this event. Bucky, Phillips, Von Karman, Fayol, Galileo...the list of significant contributors can be traced back over centuries, - not surprising for the oldest structural material used by man. Started with a strong mining orientation by the Colorado School of Mines, University of Minnesota, and Pennsylvania State University, joined soon after by Missouri School of Mines and the University of Texas, the Annual U.S. Symposium on Bock Mechanics has evolved into the main U.S. form for discussion of all aspects of rock mechanics, basic and applied - tectonophysics to comminution; near-surf ace foundations to deep mine support design. Although dominantly a U.S. event the annual symposium has benefitted from regular and important contributions from abroad. It would be presumptuous to attempt a comprehensive statement of significant developments over the 25-year history of the U.S. Bock Mechanics Symposium. This anniversary address will attempt instead to present a personal view of developments that appear to be of broad general significance and that may indicate directions for the future. Among the developments to be discussed in the address arc the following: - Energy Basis of Book Fracture Early rock mechanics investigators often overlooked the important distinction between a failure initiation stress and structural collapse. Although essentially synonymous in the

Jan 1, 1984

The Institute assembled in the room of the Board of Trade, Mercantile Library Building, on Tuesday evening, May 20th, at 8 o'clock P.M, Hon. W. D. Kelley made an address of welcome to the Institute, which was responded to by President Raymond. The Council reported, through the President, that the Institute had during' the past year, held three meetings, in New York, Pittsburgh, and Boston. Thirty-nine papers of great professional value had been read, and sixty-nine members and twenty-four associates added to the Institute. The finances of the Institute were in good condition, the report of the Treasurer, Mr. T. D. Rand, showing a balance on hand of $1569.74. The report was accepted. Prof. L. Gruner, of Paris, France, and Prof. Peter von Tunner, of Leoben, Austria, having been proposed by ten members of the Institute, and approved by the Council, were unanimously elected honorary members. The Council reported the names of the following gentlemen, with recommendation for election as members or associates. They were unanimously elected. *Barker, Prof. G. F.,.....Philadelphia, Pa. Chalfant, John W.,.....Pittsburgh, Pa. *Crawford, John J.,.....Philadelphia, Pa. *Crusius, O. H.,.Columbus, Ohio. Dibble, Theo. Hoyt,.....Pottsville, Pa. Everson, John,. Pittsburgh, Pa. Field, Robt. P.,.Philadelphia, Pa. *Fisher, F. A.,.Bristol, Tenn. *Fleming, W. E.,.Pioche, Nev. *Harden, E. B ,..Philadelphia, Pa. *Harding, G. E.,.New York. Hartshorne, J.,..'Philadelphia, Pa. Haupt, H., Jr.,.Philadelphia, Pa.

Annual Meeting, Philadelphia May, 1873 THE Institute assembled in the room of the Board of Trade, Mercantile Library Building, on Tuesday evening, May 20th, at 8 o'clock P.M, Hon. W. D. Kelley made an address of welcome to the Institute, which was responded to by President Raymond. The Council reported, through the President, that the Institute had during the past year, held three meetings, in New York, Pittsburgh, and Boston. Thirty-nine papers of great professional value had been read, and sixty-nine members and twenty-four associates added to the Institute. The finances of the Institute were in good condition, the report of the Treasurer, Mr. T. D. Rand, showing a balance on hand of $1569.74. The report was accepted. Prof. L. Gruner, of Paris, France, and Prof. Peter von Tunner, of Leoben, Austria, having been proposed by ten members of the Institute, and approved by the Council, were unanimously elected honorary members. The Council reported the names of the following gentlemen, with recommendation for election as members or associates. They were unanimously elected. *Barker, Prof. G. F., - Philadelphia, Pa. †Chalfant, John W., - Pittsburgh, Pa. *Crawford, John J., - Philadelphia, Pa. *Crasius, O. H., - Columbus, Ohio. †Dibble, Theo. Hoyt, - Pottsville, Pa. †Everson, John, - Pittsburgh, Pa. †Field, Robt. P., - Philadelphia, Pa. *Fisher, F. A., - Bristol, Tenn. *Fleming, W. E., - Pioche, Nev. *Harden, E. B, - Philadelphia, Pa. *Harding, G. E., - New York. †Hartshorne, J., - Philadelphia, Pa. †Haupt, H., Jr., - Philadelphia, Pa. * Members. † Associates.

Jan 1, 1874

Abel, Charles Edwin, Student, Univ. of California Los Angeles, Cal. '31 Adams, Horace M.5148 Benton Ave., Downers Grove, Ill. '31 Ahlskog, Harold A., Student, Washington State College Pullman, Wash. '30 Aldridge, John, Student, New Mexico School of Mines Sbcorro,, N. M. '30 Allen, Hugo K., The Univ. of Texas 104 W. 33rd St., Austin, Tex. '31 Ames, Marshall B., Student, Washington State College Pullman, Wash. '31 Ancell, Virgil F., Student,. Missouri School of Mines Rolla, Mo. '30 Anderson, Norman John, Student, South Dakota School of Mines Rapid City, S. D. '32 Annett, Norman T., Student, Mackay School of Mines, Univ. of Nevad Reno, Nev. '32 Apablasa, Salvador C., Student, Univ. of California Los Angeles, Cal. '31 Armstrong, James Arthur, Jr., Student, Michigan College of Min. & Tech., Houghton, Mich. '31 Armstrong, John R. Box 274, Neosho, Mo. '31 Armstrong, Robert H., Student, Lafayette College Easton, Pa. '31 Armstrong, Thomas E., Student, Univ. of California Los Angeles, Cal. '31 Arnot,. Paul H 2617 Haste St., Berkeley, Cal. '31 Ashby: Harve I., Willow Creek Mines Wasilla, Alaska. '31 Aud, Robert A., Student, Lafayette College Easton, Pa. '30 Augenthaler, Robert L., Student, New Mexico School of Mines Socorro, N. M. '32 Augustine, Grant, Jr., Instrument man, Min. Dept., Fairbanks Exploration Co., Fairbanks, Alaska. '31

Jan 1, 1932

Page Fundamental Principles Involved in Segregation in Alloy Castings. By R. M. Brick. (With discussion)............................* Review of Factors Underlying Segregation in Steel Ingots. By B. M. LarseX.. (With discussion)............................. 4x4 Introduction to the Session on Segregation in Steel. By Earle C. Smith......436 Relation of Open-hearth Practice to Segregation in Rimmed Steel. By J. W. HaLley and G. L. Plimpton, Jr. (With discussion)................438 Segregation in a Large Alloy-steel Ingot. By S. W. Poole and J. .4. Rosa. (With discussion) .............................459

Jan 1, 1945

By John B. Dilworth

In September, 1930, H. N. Eavenson, then Chairman of the Coal Division, appointed a Committee on Methods of valuing Coal Propelvties, with John B. Dilworth as chairman. The latter prepared a schedule' of features for consideration under the general headings of Undeveloped and Developed Coal Properties. These subjects were divided among the members of the committee and during the next year written discussions of his allotted subjects were received from each member. Mr. Grimes and Mr. Eavenson discussed the entire list,. These discussions were mimeographed and a set sent to each member before the meeting of the Institute in February, 1932. There was a general discussion at that meeting. At the meeting in February, 1934, Mr. Dilworth submitted a report12 which summarized the accumulated opinions and data and presented the conclusions of the committee as a whole on the subjects embraced in it's schedule. Members of the committee expressed the desire that some of the individual opinions be published for reference. Mr. R. Damon Hall's abstracts of these papers arc therefore presentrd herewith.3 Personnel of Committee John B. Dilworth (Chairman), Consulting Mining Engineer, Edward V. D'Invilliers Engineering Co., Philadelphia, Pa. Eli T. Conner, Consulting Mining Engineer, Seranton, Pa. W. G. Duncan, Jr., Superintendent, W. G. Duncan CoaI Co., Greenville, Ky. Howard N. EAveNson, Consulting Mining Engineer; Eavenson, Alford & Hicks. Pittshurgh, Pa. George Watkin Evans, Consulting Mining Engineer, Seattle, Wash. J. A. Garcia, Consulting And Constructing Engineer, Allen & Garcia Co., Chicatgo. III. John Alden Grimes, Valuation Engineer, Bureau of Internal Revenue, Washington, D. C. Otto Herres, Assistant Manager, United States Fue1 Co., Salt Lake City, Utah. J. R. Hicks, Consulting Mining Engineer, Eavensorl, Alford & Hicks, Pittsburgh, Pa. Robert D. Reeder, Mining Engineer, U. S. Bureau of Mines, Washington, D. C. Samuel, A. Taylor, Consulting Engineer, Pittsburgh, Pa. Bleeckee L.. WHeeler, Mining Engineer, Ford, Bacon & Davis, New York, N. Y.

Jan 1, 1934

By R. W. Ells

That portion of Quebec to which the few remarks I propose to make are more particularly intended to apply, viz., the Eastern Townships, has long been known for its mineral wealth, and has enjoyed a reputation for mining enterprises, second probably to no other part of Canada. Capital has been invested in large amounts at various points, some of which has yielded a handsome return to the investors, while in other cases the inevitable results of rash and foolish speculation have followed, much good money has been sent after bad, and the principal result has been a dearly bought expe- .

Jan 1, 1890

THE 143d* meeting of the American Institute of Mining and Metallurgical Engineers was held in New York, Feb. 19-22, 1934. It consisted of the annual business meeting, 45 technical sessions at which 217 papers were presented (more than ever before), two sessions of the Board of Directors, two meetings of Section delegates, three formal lectures, luncheon Monday, Tuesday and Wednesday for members and guests, three group dinners and five group luncheons, eight committee meetings, the annual reception and dinner dance, an informal dance, a smoke-dinner and the annual meeting of the Woman's Auxiliary. Attendance showed an improvement over the previous year, as follows: Total, 1534 in 1934, and 1475 in 1933; dinner dance, 543 and 426; smoker-dinner, 425 and 394; informal dance, 295 and 250; women's registration, 160 and 133; luncheons, 1034 and 734. The Coal Division held a general session and three sessions on Coal classification. It also met jointly with the Committee on Ground Movement and Subsidence. At the general session, John B. Dilworth presented a report of the Committtee on Methods of Valuing Coal Proper- ties and R. H. Sweetser a report of the Committee on Evaluation of Coal for Blast-furnace Coke. C. B Huntress, Executive Secretary of the National Coal Association, was the principal speaker at a luncheon on Monday, at which Eli T. Conner, Chairman of the Division, presided H. N. Eavenson, newly elected President of the Institute, and Edward W Parker, Secretary-Treasurer, of the Anthracite Institute, also spoke. The Executive Committee of the Division met Tuesday afternoon. The Sectional Committee on Classification of Coal met on Thursday morning and the Technical Committees on Scientific and Use Classification of Coal on Thursday afternoon. The Committee on Mining Methods held two general sessions, one for presentation of a half-dozen interesting papers on strictly mining subjects, the other on Aerial Transportation. It also participated jointly in a session on ground movement and subsidence with the committee of that name and the Coal Division The Institute's Standing Committee on Aviation had its inception at the session on Aerial Transportation

Jan 1, 1935

By Wasyl Kunda

High grade jig and low grade flotation concentrates used in the following experiments, are produced from silver ore at the mine. The study was carried out to recover the silver and other metals from these concentrates by hydrometallurgical methods. The concentrates were subjected to two stage oxida¬tion leaches in a HNO3-H2SO4 medium. The dissolved metals were recovered by selective precipitation of: (a) silver chloride, (b) iron-arsenic-bismuth residue, (c) copper sulphide, (d) cobalt-nickel sulphide. The effluent solution contained only ammonium sulphate and ammonium nitrate. The silver chloride was further processed to the high purity silver powder by the AgCl ? Ag2S ? Ag2SO4 ? Ag° route. The recovery of silver from the concentrates was over 98% and other metals from 95 to 99%.

Jan 1, 1984

By L. A. Morley, W. T. Parry

Laboratory prepared clay-quartz sand samples and fault gouge from an open pit slope undergoing plane-type failure were tested in the laboratory to determine potential mining applications of electroosmotic stabilization and to provide a better understanding of electrochemical hardening. Experiments with very low current densities and free access of electrolytes to both anode and cathode showed an increase in cohesion. Cohesion in a fault gouge increased by 9.3 to 113%, depending on location with respect to the electrodes. For this, power consumption was equivalent to 0.727 watt-hr per cu ft (25.69 watt-hr per cu m). Regions of electrochemical hardening were determined by pH and the anolyte used. Electroosmotic stabilization appears as a reasonable solution to some types of mining problems.

Jan 1, 1975

By David S. Cahn

Pilot-plant and laboratory tests were made on blends of steel plant flue dust and portland cement to determine whether the flue dust could be pelletized for use as a source of iron in dry process cement manufacture. Strength and setting time results showed that an acceptable agglomerate can be made with a Type II portland cement binder. Abrasion-resistant and well-sized pellets were made in a horizontal drum, using a simulated closed circuit, with a binder content of 7.5% and a moisture content below 15%. Pellet quality was found to be relatively insensitive to changes in binder concentration above 5%. Simulations of stockpiling and weathering indicate that little difficulty would be encountered with use of the flue dust pellets in cement plants.

Jan 1, 1972

By Edgar S. Cook

At the close of the Bethlehem Meeting, the writer was experimenting with large fuel-charges, 4000 Ibs. basis, as compared with 2000 Ibs., hot had not made sufficient progress to draw any safe conclusions. Previously me had always used 2000 Ibs. fuel, the ore-burden being proportioned to this as a basis. I could never persuade myself that there was any advantage to be derived from following the more popular method of larger fuel-charges. Our men were accustomed to the old way of filling ; and we did not care to run the risk of the errors likely to follow any alteration in routine work, particulary as I could not, by my course of reasoning, discover ally compensating gain. Nevertheless, after reading Mr. Gordon's discussion of Mr. Birkinbine's paper, '' Operations of Warwick Furnace from August 27th, 1880, to September 1st, 1885" (Transactions, xiv., 833), I determined to test by actual experiment the value of large fuel-charges : the change was made in the week commencing March 28th, 1886, and continued until July 25th, about four months. The fuel and ores remained during the trial the same as had been used before, and have been used since. For the first two weeks, the furnace worked with great regularity, giving excellent results, exceeding those of the two weeks immediately preceding. But for my remembrance that the furnace had on former occasions worked with equal uniformity for longer periods without any apparent reason, I should doubtless have concluded that this improvement was due to the different method of filling and congratulated myself that a means had at last been found to prevent inconvenient "dirt" accumulations. Before abjuring my previous skepticism, however, I resolved to pursue the trial further. The fourth meek developed the peculiar conditions that had prevailed previous to the change; and these continued with more or less frequency during May, June and July. At last, finding no improvement over the smaller charges—no change in fact for better or for worse—I commenced filling the 2000 lbs. fuel-charge in the latter part of July, and have continued it up to present writing, September 4th.

Jan 1, 1887

By Lawrence Adler

Any design of a mine roof in bedded deposits which ignores differential deflections at the supports can quickly lead to dangerous overstressing. As illustrated by the typical case presented on page 1029, if one support deflects only 0.1 in. more than its neighbor, stresses 50 pct higher than anticipated will result. Previous studies1-3 have assumed that the mine roof acts like a beam clamped at both ends, with no deflection or slope4 at the supports (Fig. 1). Essentially this assumes:5,6 [BA = OD = 0 and dA = dB = 0.]

Jan 10, 1959