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By Ferdinand H. Regel

Concentrating-machinery has been wonderfully improved during the past few years both in technical efficiency and in economy of power; and, in the writer's opinion, the prosperity which the mining industry has of late enjoyed is due in large part to this improvement. Many properties are yielding handsome profits at the present time which were considered, a few years ago, too low in grade of ore to be profitably operated; and I think that fully half of these once worthless properties owe their successful development to recent improvements in concentrating-machinery. The present paper calls attention to a jig and an ore-classifier of new design, invented by Mr. John Klein, and already used in the lead-region of SE. Missouri, and in the Philipsburg dis-

Jan 1, 1902

At the Second Pan-American Scientific Congress, meeting in Washington, D. C., from Dec. 27, 1915 to Jan. 8, 1916, the following special topics will be discussed in each of the four sub-sections of Section VII, of which Hennen Jennings is Chairman: A. Mining.-The mining law of each country and the changes that may be made to aid the development of mineral resources. History of the mining industry in each country with reference to the beginnings of that industry. The development of the Patio process. Bibliography of mining. B. Metallurgy.-Present methods of concentrating ores and the development of concentration methods. International relations in the exchange of ores and metals. Bibliography of metallurgy. A. and B. Mining and Metallurgy.-Development of hydro-electric power for mining and metallurgy, the amount probably available, and specific benefits from its utilization.

Jan 1, 1916

STANDING COMMITTEES Executive-SIDNEY J. JENNINGS, chairman. Membership-KARL EILERS, chairman. Finance-J. V. N. Dorr, chairman. Library-E. GIBBON SPILSBURY, chairman. Papers and Publications-BRADLEY STOUGHTON, chairman. Nominations-R. V. NORRIS, chairman.

Jan 1, 1919

By R. G. Knickerbocker

A most important research and development item on ferroalloys in the calendar year of 1949 was the increase of interest in the recovery of secondary manganese. Owing to the importance of manganese to the nation's welfare, it is Ferroalloys most necessary that all possible avenues of research and development on the recovery of this vital metal be investigated. The principal objective of this new development is to recover manganese from steel furnace slags. Steel furnace slags contain a total of approximately 772,000 tons of metallic manganese which is compared to the 680,000 tons of metallic manganese as ferromanganese that is estimated to be used by the steel industry, annually, at this time.

Jan 6, 1950

On Apr. 21, the Victory Liberty Loan was offered to the public. This Loan is made necessary by the expenditures incident to closing of the war. As in preceding Liberty Loans, an intensive campaign is being conducted, and this Committee is to obtain and record subscriptions from the Industry of which you are a part. I am sure you feel as I do in wishing the Mining Committee to make as good a showing as possible. By placing or recording your subscription through us will help your Committee to make its proper showing, and, as heretofore, your transaction can he carried out with any bank or trust company you may prefer to designate. Payment may be made in full or in six instalments. In either case, 10 per cent. will be required on or before May 10. Subscription blanks will be mailed to you as soon as available. CHARLES HAYDEN, Chairman.

Jan 5, 1919

By Marvin P. Barnes

The Sacaton open pit copper mine has recently been placed into production. Some problems have been encountered in maintaining grade control due to differences between early block estimates and actual production grade. A study was made using three methods for computing grade for 50' x 50' x 40' size blocks from exploration and development drill holes; 1) The polygonal method, 2) The inverse distance squared method, and 3) The geostatistical kriging method. The results of each were compared against a control block file created by using the assay results of all blast holes drilled in the ore over three benches of the new pit. Results indicate that the kriging technique gave better estimates for grade of individual blocks than did the other two methods for this particular deposit.

Jan 1, 1977

By Rodney L. Stone

In past attempts to characterize green and dry iron ore pellets, the authors have found large variations in the results of strength tests performed on closely sized pellets from the same batch. Where bentonite was the binder, such variations in the pellet quality were attributed to the presence of internal flaws and the nonuniform distribution of the binder. Studies have shown that pellet strength is strongly dependent on the degree of "mixedness" of the iron ore concentrate and the bentonite binder. However, before such a relationship can serve as a guide for the development of better mixing techniques and the associated economy of bentonite consumption, more precise knowledge of the bentonite-concentrate mixtures is needed. For example, what is the bentonitc distribution from pellet to pellet and within pellets?

Jan 1, 1970

Jan 1, 1955

As already announced, the Arizona Meeting of the Institute is to be held from the 18th to the 25th of September. There will be a special train from New York City to Arizona and return, to take members and guests of the Institute to the meeting. The Committee in charge consists of Walter Douglas, Chairman, Cleveland E. Dodge, John C. Greenway, Arthur S. Dwight and Julius Kruttschnitt, Jr., and while the plans of this Committee are not complete, it may be announced that the train will be run with the requisite number of Pullman, dining and baggage cars to accommodate those who desire to go, which will accompany the party during the entire week of the Arizona Meeting as per the following program, including, of course, the visit to the Grand Canyon. As soon as details have been worked out, a circular will be issued giv¬ing full information concerning the trip.

Jan 7, 1916

WE the undersigned, being all persons of full age and citizens of the United States, and a majority residents of the State of New York, desiring to form a corporation pursuant to the provisions of the Membership Corporations Law for the purpose of incorporating, as provided in Section 5 of Article I. of said law, the existing unincorporated association known as American Institute of Mining Engineers, do hereby make, acknowledge and file this Certificate for that purpose, and do Certify as follows I. That the American Institute of Mining Engineers is an unincorporated association organized and existing with the object of promoting the arts and sciences connected with the economic production of the useful minerals and metals and the welfare of those employed in these industries by means of meetings for social intercourse and the reading and discussion of professional papers, and to circulate by means of publications among its members and associates the information thus obtained.

Jan 1, 1923

By Adrian Brown

Over the last decade, a number of large slopes have been excavated in rock which contains families of joints or faults which dip steeply into the cut slope. Despite the absence of "adverse" structures, these slopes have exhibited alarming movement rates at very modest heights (as little as 100 meters) and slope angles (as little as 20º). Classical stability analysis suggests that such slopes should be unconditionally stable. This paper describes the toppling mechanism which has been found to be the cause of the observed movements and develops a general method for analysis of it. Simple cases are analyzed in order to provide charts which allow quick evaluation of the likelihood of this phenomenon occurring. The safety implications of such movements in slopes are also examined.

Jan 1, 1982

Jan 11, 1951

Jan 1, 1884

Report was made by the Committee of National Engineering Societies on the Reserve Corps of Engineers and it was voted that a committee of - three be formed-consisting of the President of the Institute, Dr. Henry -S. Drinker and the Secretary of the Institute-to select members in different parts of the country to-advise with the local U. S. Engineer Officers as to qualifications of applicants for the Reserve Corps of Engineers.

Jan 8, 1916

Following is the personnel of the various society and national committees on which the A I M E is officially represented United Engineering Society Officers of the Board, 1920 JOHN VIPOND DAVIES,, President CALVERT TOWNLEY, 1st Vice-president ALFRED D FLINN,, Secretary WALTER M McFARLAND, 2d Vice-president JOSEPH STRUTHERS, Treasurer Finance Committee House Committee WALTER M McFARLAND Chairman GEORGE H PEGRAM W L SAUNDERS

Jan 1, 1923

SHORTLY after Ambrose Swasey suggested the creation of the Engineering Foundation in 1914, the World War broke. upon the scene. Consequently all eyes were soon turned to national security problems. In 1916 the newly-organized Engineering Foundation and the four National Societies joined with the National Academy of Sciences in establishing the National Research Council. From then until 1923 the Engineering Foundation devoted the greater part of its resources to the support of the Research Council and the Council's division of engineering. Since 1923, how-ever, it has turned to the original intention for which it was created, of cooperating with the national societies in proj-ects affecting engineering at large, though it still retains a connection with the Research Council. Mere enumeration and tabulation of work undertaken can of course lend but a vague idea of actual accomplish-ments. The reports of the Foundation give information of its widespread activities.

Jan 2, 1928

Discussion of the paper of J. C. Febles, presented at the Butte meeting, August, 1913, and printed in Bulletin No. 79, July, 191.3, pp. 1267 to 1283. J. W. RICHARDS,. South Bethlehem, Pa. :-In looking at these precipitating launders the idea has come to me that the iron could probably be kept much cleaner if there were laid on the bottom of the . launders some sheet copper, with which the iron would be in contact, and as the solution passed over the tendency would he to precipitate the copper on the sheet copper and thus keep the iron cleaner than it is under present conditions. As soon as a piece of iron becomes coated with copper, its surface becomes inactive, and the presence of a sheet of copper in electrical contact with the iron would tend to precipitate the copper on the sheet copper and to keep the iron clean.

Jan 11, 1913

Salt Lake City was founded July 24, 1847, by Mormons under the leadership of Brigham Young. It had a population of 1 18.1 10, according to the United States census of 1920, and of 15 1,968, according to a civic survey, January 1, 1925. The Salt Lake metropolitan district is estimated to have 180.079 inhabitants. The city's area is 5 1.8 square miles. Its altitude is 4,354 feet. It has 514 miles of streets, of which 91 miles are paved. The streets in the main portion of the city are 132 feet wide and the blocks are 660 feet long. It has 144 miles of street railway and 2,200 electric street lights. It has fifteen parks and playgrounds, forty public schools and six private schools. It has eighty-nine church edifices, of which forty-nine are devoted to denominations other than the Mormon church.

Jan 1, 1925

By William E. Ford, Edward Salisbury Dana

The aluminate, ferrates, etc., allied chemically to the borates, have been already intro- duced among the oxides. They include the species of the Spinel Group, pp. 418-423, also Chrysoberyl, p. 423, etc. SUSSEXITE. In fibrous seams or veins. H. = 3. G. = 3.42. Luster silky to pearly. Color white with a tinge of pink or yellow. Translucent. Index, 1.59.

Jan 1, 1922

By Vernon E. Swanson, Tom G. Ging

Experiments indicate that simple addition of water to mixtures of untreated trona and otherwise insoluble leonardite yields a rich, black, slightly alkaline solution of concentrated humic substances. Prices of both trona from Wyoming and leonardite from South Dakota and Wyoming are very similar-$10-30 per ton. Leonardite is the term commonly given to naturally weathered, oxidized coal that is readily soluble in slightly alkaline water.1 Several tens of thousands of

Jan 1, 1973