Search Documents

By Keith G. Papke

Jan 1, 1985

By Salim Akhtar

The operation of a mineral processing plant with a complex flowsheet is represented by a mathematical operator. Such a representation permits a quantitative evaluation and monitoring of the separation processes in different sections of a processing plant, and gives an overall separation efficiency of the plant.

Jan 1, 1975

E. H. Dix, JR., Chairman L. W. M. PEIRCE, Past-chairman R. F. MEHL, Vice-chairman ALBERT J. PHILLIPS, Vice-chairman E. M. WISE, Secretary International Nickel Co., Bayonne, N. J. W. M. CORSE, Treasurer LOUIS JORDAN, Executive Secretary 29 West 39th St., New York, N. Y. Executive Committee W. H. BASSETT, JR. R. H. LEACH' W. H. FINKELDEY W. E. REMMERS2 J. A. GANN H. J. ROAST G. O. HIERS C. S. SMITHS L ZICKRICK

Jan 1, 1936

By James R. Piper

Jan 1, 1985

By S. G. Lasky

Editorial writers and convention speakers are inclined to lean hard on certain perennial topics which need a better degree of definition. One of those topics is mineral self-sufficiency. Everyone interested in it ought to adhere to the definitions and absorb the background data set forth here by Mr. Lasky which nails down the subject to talkable dimensions once and for all! Mineral self-sufficiency is a flexible concept-one which changes with both economic and political vicissitudes.

Jan 8, 1961

By Michael J. Klishis, Daniel K. Thomas

This paper describes and evaluates factors to be considered in applying computer based instruction (CBI) to the mining industry. CBI is especially suited to the monitoring of training functions and to the delivery of competency-based task training. Its effectiveness is dependent upon: (a) organizational factors (size, number of trainees and trainers, and current training budget), (b) appropriate hardware (accessibility, exclusivity, user-sophistication, transportability, graphics, and cost), and (c) appropriate software (flexibility, response evaluation, video interaction, graphics, and trainee management).

Jan 1, 1983

[ ]

Jan 1, 1938

Jan 1, 1937

By David M. Hopstock, Jose M. Pastrana

The magnetic susceptibilities of samples of natural and artificial hematite and natural goethite were measured by the Faraday method as functions of temperature, magnetizing field strength and particle size. All samples showed weak ferromagnetism, which accounted for large variations in susceptibility with field strength and particle size. Three probable sources of the weak ferromagnetism were identified.

Jan 1, 1978

By Roger Thunvik, Carol Braester

Excavation of cavities below the ground water level induces water influx from the surrounding aquifer. An estimate of the rates of flow prior to excavation operations may be of valuable information for the mining engineer. The present paper deals with water influx into cavities of the tunnel type, e.g., mine galleries, tunnels, etc. The solution of the flow problem was obtained by a numerical finite difference method. The results are presented in dimensionless form as a function of the parameters characterizing the location of the cavity in the aquifer.

Jan 1, 1981

By H. M. Howe, W. E. C. Eustis

THE processes which form the Subject of this paper have been experimented on in the laboratory of W. E. C. Eustis, but have not passed beyond the experimental stage. The first is the invention of Mr. J. L. Thomson, of Capelton, Quebec, Canada, the others have been invented by the writers. THOMSON'S PROCESS FOR THE EXTRACTION OF NICKEL This consists essentially in first rendering the nickel magnetic, and then separating it from the materials. with which it is mechanically

Jan 1, 1882

By R. L. Wiegel

Consideration has been given to the merging of a size reduction model and a mineral liberation model to permit prediction of mineral composition as a function of size. The results of this integration of size reduction and mineral liberation models are discussed from both theoretical and practical viewpoints using batch grinding data for a magnetic iron formation sample as a demonstration vehicle.

Jan 1, 1977

Exploration by AS&R of the Nuestra Senora lead-zinc-silver property, located in Cosala District, Sinaloa, Mexico, has proved sufficient ore to warrant placing the mine on an operating basis. Installation of mine plant, concentrator, and townsite, is expected to commence late in 1951. Opening of a lead-zinc property in Nigeria is also being contemplated by AS&R. Private enterprise is being urged by Secretary of Interior Chapman to start a synthetic fuels industry, it is reported. Based on tests at the Louisiana, Mo., plant which produces quality gasoline at costs up to 144 per gal, he predicts that a commercial plant would pay for itself in 10 years.

Jan 4, 1951

Jan 1, 1897

H. A. SCHWARTZ, ? Indianapolis, Inc. (written discussion§).-Re-ferring to the very interesting paper on the graphitization of white cast iron, the writer desires to present certain facts and conclusions, entirely, in harmony with those of the authors but which may he not without interest as furnishing additional evidence upon the same subject. The graphitization of white cast iron, being the basis of malleable

Jan 10, 1919

By Robert R. Britton

A study conducted at The Ohio State University sought to deter- mine whether explosives break rock primarily employing shock energy or energy stored as borehole gas pressure. The amount of broken material, calculated borehole pressure, and measured stress waves are compared as decoupling ratios (borehole diameter/explosive charge diameter) increased from 1 to 3 and all other variables remained constant. Breakage and calculated borehole pressure displayed a decrease as the decoupling ratio increased while the shock energy remained constant. The strong implication is that borehole gas pressure is the primarary force in breaking rock with explosives.

Jan 1, 1984

By F. M. Walters

In order to isolate the effect of an element on some property of an alloy, the effect of the other alloying elements must be elimi-nated, either by reducing their quantity to the extent that they may be neglected or by determining the specitic effect of each. The success of Grossmannl in calculating hardenability from chemical composition by means of factors suggested such a

Jan 1, 1943

National Steel Shuts Weirton Coal Operation Dutch Firm May Aid Ungava Project

Jan 7, 1953

Arizona E. P. MATHEWSON, Chairman F. W. MACLENNAN, First Vice-chairman CLYDE E. WEED, Second Vice-chairman E. D. GARDNER, Secretary-Treasurer Box 4097, University Station, Tucson, Ariz. I. H. BARKDOLL HENRY F. EASTER MICHAEL CURLEY R. D. LEISK Boston Meets first Monday each month, October to May, inclusive ROBERT S. WILLIAMS, Chairman GLEN F. JENKS, Vice-chairman F. LEROY FOSTER. Secretary-Treasurer Rooms 6-202, Mass. Inst. of Tech., Cambridge, Mass. HOLCOMB J. BROWN ESPER S. LARSEN

Jan 1, 1936

Jan 1, 1891