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Jan 1, 1879

By T. W. Healy, D. R. Dixon

The mechanism of activation of ZnS by metal ions and the subsequent flotation induced by xanthate has been considered as a surface redox reaction. By ultraviolet (UV) irradiation of ZnS suspensions, the normally inert ZnS is caused to react with xanthate in the absence of activator. By similar UV irradiation, the rate of adsorption-exchange of activator ions at the ZnS-H2O interface is also increased. Mechanisms of these reactions are proposed and compared to current electrochemical and semiconducting models of sulfide flotation.

Jan 1, 1976

By R. H. Eckhouse, M. R. Geer, H. F. Yancey, C. L. Allyn

Four coals were treated in the Humphreys spiral concentrator, and the products were examined by float-and-sink and screen-sizing tests to determine fundamental performance characteristics. The efficiency of the separation between coal and impurity was shown to be influenced greatly by particle size.

Jan 10, 1950

Later this month (June 24-27) in San Francisco, the Society of Mining Engineers of AIME, together with the American Society of Civil Engineers, the Canadian Institute of Mining & Metallurgy and the Engineering Institute of Canada, is sponsoring the second biannual Rapid Excavation and Tunneling Conference. The dominant theme of the Conference is the practical application of techniques and research relating to underground rapid excavation and tunneling. In the following pages, ME gives highlights of many of the 24 technical sessions and some of the papers being presented. The full proceedings of the Conference will be published by SME-AIME later this year.

Jan 6, 1974

Jan 1, 1898

By F. D. Dietiker

After determination of the requirements for a given application, proper selection of a belt conveyor is made from tables and formulas commonly used by conveyor designers. Belt conveyors, which are universally accepted as a means of transporting bulk materials, also perform the important functions of stockpiling and reclaiming.

Jan 1, 1978

By Howard W. Jacky

At Weed Heights, Nev., precipitation plays a major role in the plant operation. Almost two-thirds of the present copper production is leach-precipitation plant copper. The entire plant complex processes about 135,000 tons of low grade copper ore per week. Of this tonnage, 49,000 tons of about 0.78% sulfide ore are treated in the concentrator. This is handled in the conventional manner of crushing, grinding, and concentration of the copper sulfide by flotation.

Jan 6, 1967

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Jan 1, 1938

By J. Brian Eby, T. I. Harkins

THIS paper outlines the geophysical investigation of the area covering the Darrow salt dome, Louisiana. Surveys with the refraction seismograph and torsion balance failed to disclose the dome, but reflection dip shooting was successful and was confirmed by later drilling.

Jan 1, 1942

Jan 2, 1951

By J. B. Mackintosh

THE quantitative determination of copper, by means of electro-deposition, offers so many advantages, that it is to be preferred, when properly executed, to all other methods for ease and accuracy. The object of the present paper is to give the results of a number of experiments made during the past few months, and to indicate some sources of error, which must be avoided in order to attain the necessary accuracy. In 1867, C. Luckow, in competition for a prize offered by the directors of the Mansfield Copper Works, submitted the following

Jan 1, 1882

Jan 1, 1918

By D. M. Wyslouzil

Standard testing methods are described that are presently used for the selection of grinding equipment. Correlation between laboratory batch grinding tests and pilot plant continuous tests are established by means of particle size distributions and flotation results. Conventional and autogenous grinding circuits are discussed showing the relationships of the controllable circuit parameters.

Jan 1, 1982

By Lynn B. Hales

The software systems which support the Pinto Valley Supervisory Control System are divided into three general categories. These are defined as the real-time operating system; a process data acquisition, reduction, and communication system; and a set of process-oriented systems which interface the operators and engineering staff to the process. The role of each of these three classes is reviewed. The software systems which provide reports, status displays, and trend graphs are discussed.

Jan 1, 1978

By J. B. Mackintosh

The quantitative determination of copper, by means of electrodeposition, offers so many advantages, that it is to he preferred, when properly executed, to 611 other methods for ease and accuracy. The object of the present paper is to give the results of a number of experiments made during the past few months, and to indicate some sources of error, which must be avoided in order to attain the necessary accuracy. In 1867, C. Luckow, in competition for a prize offered by the directors of the Mansfield Copper Works, submitted the following

Jan 1, 1882

Jan 1, 1883

By W. F. A. Thomae

The Villayet of Aidin is a province in Asia Minor which has a coast line extending from opposite the island of Mitylene to beyond Makri, opposite the island of Rhodes, and embraces almost the entire basins of the two principal rivers, the Sarabat

Jan 1, 1899

By F. R. Conley, D. A. Shock

Solution Mining or In Situ Mining has received increasing attention in the past few years because the method offers many attractive possibilities in improving the environmental impact of mining as well as making feasible the extraction of deeper, low value mineral reserves. This paper will present a brief discussion of the state-of- the-art in total solution, slurry removal and leach mining. As a specific example of utilizing the method, the uranium deposits of South Texas are a type of deposit which have been considered as being amenable to in situ leach mining. The parameters required to ascertain the amenability of such a deposit for in situ leaching will be presented. The hydrological factors which influence the production of the soluble uranium solutions and their displacement will be discussed. Mathematical models for various well configurations have been made and graphic representation will be presented to illustrate various production methods and the resultant hydrological consequences.

Jan 1, 1974

NEW MEMBERS The following list comprises the names of those persons who became members during the period July 10 to Aug. 10, 1915: Members ALBERTSON, MAURICE MERTON, Mine Surveyor, Mining Corporation of Canada, Cobalt, Ont., Canada. ARMSTRONG, GEORGE CHANDLER Mgr., Indian Refining Co., Lawrenceville, Ill. BARBER, MAX HAYDEN, Min. Engr Supt., Crosby Mine, Nashwauk, Minn. BARNESON, JOHN Merchant, 310 Sansome St., San Francisco, Cal. BENSEL, JOHN A., Cons. Engr 111 Broadway, New York, N. Y . BORGESON, ANSHELM CYRUS, fin. Engr Shenango Mule, Chisholm, Minn. BROOKS, CHARLES PETER, Min. Engr 228 Dooly Bldg., Salt, Lake City, Utah. BROWN, FRANK HAROLD, U'011',. Min. Engr., Federal Co., Inc., 50 Broad St., New York, N. Y. CLARK, DOUGLAS Kellogg, Idaho.

Jan 9, 1915

By Robert W. Hunt

Having had some twenty years' experience in trying to make good Bessemer steel rails, and now devoting my thoughts and energies to seeing that other people seek the same end, I venture to lay before the Institute some of the conclusions deduced from my practice and observation.

Jan 1, 1889