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By Fathi Habashi

Nickel, copper, and elemental sulfur can be recovered from a low-grade pyrrhotitepentlandite type concentrate by leaching with HNO3 in a pressure reactor at moderate temperature and pressure. The bulk of iron is converted to an oxide. Same results can be achieved by leaching in an open vessel under a reflex condenser for an extended period of time.

Jan 1, 1974

Data for 1962 world-wide, non-communist bloc geophysical activity, including geochemistry, are now available through the Society of Exploration Geophysicists. This information was made available to the AIME Geophysics Unit Committee through the courtesy of Charles L. Elliot, Mining Coordinator for the SEG. The data were compiled from 245 responses to 496 questionnaires mailed (49%). The data for the U.S. are a realistic representation of actual activity, followed by Asia, Canada, Europe, Australia, Africa and Latin America in order of decreasing reliability.

Jan 9, 1963

Executive DONALD B. GILLIES, Chairman WILLIAM WRAITH, Vice-Chairman ERLE V. DAVELER PAUL D. MERICA W. H. PEIRCE Finance H. G. MOULTON, Chairman H. T. HAMILTON HENRY KRUMB Admissions CHESTER A. FULTON, Chairman GEORGE D. BARRON, Vice-Chairman A. B. JESSUP PHILIP KRAFT EDWARD MEAGHER Alternates P.B. BUCKY SAMUEL HASKELL F. T. SISCO

Jan 1, 1939

By H. S. Munroe

The accompanying figures illustrate the dumping-device used at the new dressing works of the St. Joseph Lead Co., at Bonne Terre, Mo. It is a dumping-cradle, of a type much used abroad, in which the car is turned upside down to discharge its load. The main

Jan 1, 1889

By David L. Thompson

The Alumet Company, a partnership of National .Steel Corporation, the Southwire Company, and Earth Sciences, Inc., is in the final phase of its feasibility study for an alunite plant. To be located in southwestern Utah, it could be the first commercial-scale operation in the Western Hemisphere to recover alumina from an ore other than bauxite. Sulfuric acid and sulfate of potash are by-products of the process. Alumina production level will be set at 500,000 tons p

Jan 1, 1976

By W. E. Coughlin, R. L. Faverty, F. H. Lightner

The intent of this paper is to present the general strategy and method of implementation to achieve a "fast-track" mine development. The major objectives of a "fast-track or rapid development schedule are to minimize front-end development expenditures and to realize an early cash flow from operations. The Borealis project of Houston International Minerals Corp. (HIMCO) is used as the working example to illustrate the development schedule. Borealis is a 2.9 kt/d (2,500 stpd) gold-silver heap leach operation near Hawthorne, NV.

Jan 1, 1984

At its meeting on February 21, 1933, the Board of Directors passed the following resolution defining and expressing the policy of the Institute with respect to official participation or action in controversial matters: WHEREAS, the Board of Directors at its last meeting. passed the following resolution: "The Board of Directors, having been appealed to by several Local . Sections for advice concerning the attitude and policy of the Institute relating to the endorsement of candidates for public office, the following statement of policy is formulated:

Jan 1, 1937

By W. C. Knopf, I. M. LaBaron

In the Carlsbad area potash is dry-mined and wet- concentrated. Wet concentration involves recirculation of saturated brines, with resultant difficulties of brine disposal and inherent losses in recovery through solution of the KC1. A dry beneficiation process for potash minerals would offer many advantages over present methods. International Minerals & Chemical Corp. has been working on development of a dry process for some time. This article is a progress report.

Jan 10, 1958

By Freeman Bishop

Nothing has disturbed the copper- lead-zinc producers in recent years more than smelter tolerances set by some states. What hurt most, copper spokesmen told the Government, was the Government's own erroneous estimates of smelter pollution controls. Government charts indicated that 23 firms smelting copper, lead and zinc may need to invest about $108 million by fiscal 1976 to control stack emissions. The copper industry's independent study, however, indicates that the required controls could cost as much as $550 million to install and $200 million a year to operate.

Jan 1, 1971

STANDING COMMITTEES. Executive. CHARLES F. RAND, Chairman. JAMES F. KEMP, JOSEPH W. RICHARDS, ALBERT R. LEDOUX, BENJAMIN B. THAYER. Membership. BENJAMIN B. THAYER, Chairman. KARL EILERS, JOHN H. JANEWAY, JR., JOHN D. IRVING, HERMAN A. PROSSER. Finance. EDWARD L. YOUNG, Chairman. KARL .EILERS, JAMES GAYLEY. Library. JAMES F. KEMP, Chairman 1 JOHN HAYS HAMMOND,3 E. GYBBON SPILSBURY,2 ALEX. C. HUMPHREYS, 4 BRADLEY STOUGHTON.

Jan 12, 1913

Much has been written in the past about the non- cataracting ball mill as typified by the installations of the Tennessee Copper Co. at Copperhill and the three units of the Cleveland-Cliffs Iron Co. in its Humboldt and Republic mills. Because no direct comparisons are available from the Cleveland-Cliffs plants and because the published data of Tennessee Copper Co.'s London mill covered a period of development over several years, it has been difficult for engineers to grasp the full significance of the non-cataracting economics.

Jan 11, 1957

By Ronald R. MacDonald

There is an ongoing need for the abstracting and coding of new information in the energy and environmental studies field for addition to the BIRS system. There are approximately 3000 bibliographic entries coded into the BIRS system. The bibliographic retrieval system was designed to be run by the general data management System 2000. The information system with entries of coal research, land reclamation and other energy and environmental studies is up and on line. As more entries are coded they are loaded into the system.

Jan 1, 1977

Executive R. C. ALLEN, Chairman ERLE V. DAVELER, Vice-chairman WILDER JUDSON R. M. ROOSEVELT G. B. WATERHOUSE Finance H. G. MOULTON, Chairman HENRY KRUMB PAUL D. MERICA H. T. HAMILTON, Consultant Admissions W. B. HEROY, Chairman GEORGE D. BARRON, Vice-chairman H. T. HAMILTON PHILIP KRAFT W. A. SINSHEIMER

Jan 1, 1937

By John M. Karpinski, David S. Cahn

For many years the green and dry compressive strengths of pellets have been considered as possible criteria of pellet performance during induration. Little attention, however, has been given to standardizing the unfired pellet compressive strength test or to determining the characteristics of this test. The purpose of this study was to compare the constant deformation rate test with constant loading rate tests. In addition, the dependence of these tests on such pellet properties as size and weight was to be investigated.

Jan 7, 1969

By Christopher C. Barton

Each variable known to affect laboratory measurement of fracture-energy and fracture-toughness is reviewed. Specific examples are cited where each of the variables have been isolated.

Jan 1, 1982

By Henry C. Freeman

The writer spent the month of November last in the La Plata mountains, Colorado, and the material portion of his observations, so far as they may be of general interest, is here recorded. The La Plata mountains lie northwest of the town of Durango. The California mining district is co-extensive with the mountains. They appear on the map as an isolated group; but an examination on the ground shows that they are the continuation of the great

Jan 1, 1885

By T. Chen

One of the limitations of the 3-dimensional Lerchs-Grossmann pit optimisation algorithm has been the difficulty in calculating an optimum pit with variable wall slopes. The difficulties have been related to establishing various wall slopes without changing the sizes of the blocks used in the normal computation, but still retaining an optimum solution.

Jan 1, 1977

By Walter G. Perkins

As this particular product holds a place by itself, it seems desirable to give a paper dealing especially with it as a corollary to my paper entitled " The Litharge Process of Assaying Copper-Bearing Ores and Products, and the Method of Calculating Charges."* The process is first to convert the metallic copper into matte by the addition of sulphur, allowing the two elements to combine at the bottom of the crucible when heat is applied. The

Jan 1, 1903

By Raymond Franz

Of the many types of capital equipment found in a surface operation, draglines and mining shovels are probably subjected to the most severe service. Yet, some excavators have seen a generation or more of continuous service-proof, if any is needed, of their ruggedness. To keep these expensive pieces of machinery operating, a continuing maintenance program which includes field weld repairs is essential. During an excavator's working life, minor cracks may appear in parts of the steel structure, caused by fatigue and sometimes material defects-defects so small they could not be detected during manufacture.

Jan 6, 1978

The current status of the US lead and zinc industries was reviewed by J. G. McCullough, president of Amax Lead and Zinc Inc. He reported that in the US, lead and zinc are separate industries because of the nature of mineralization. The large Mississippi-type zinc deposits are practically lead-free, and while the new lead belt in Missouri has some zinc content, it does not have the same favorable economic impact as in the complex massive sulfide ore bodies being developed elsewhere.

Jan 11, 1977