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Oct. 3, AIME, National Open Hearth. Southern Ohio Section, Deshler-Wallick Hotel, Columbus. Ohio. Oct. 10, AIME, Eastern Section, National Open Hearth Steel Committee, Harwich Hotel, Philadelphia. Oct. 15-17, Canadian Institute of Mining and Metallurgy, annual western meeting, Royal Alexandra Hotel, Winnipeg. Oct. 20-22, AIME, Institute of Metals Div., fail meeting with National Metal Congress. Hotel Adelphia, Philadelphia. Oct. 20-24, American Society for Metals, meeting with National Metal Congress, Benjamin Franklin Hotel, Philadelphia. Oct. 20-24, 40th National Safety Congress, Conrad Hilton, Congress, LaSalle. Morrison and Sheraton Hotels, Chicago. Oct. 24, Fall Meeting of Mining Branch of the Southern California Section, AIME, Statler Hotel, Los Angeles. Oct. 24, Illinois Mining Institute, annual meeting, Hotel Abraham Lincoln. Springfield. Ill.

Jan 1, 1952

By R Yang, P D. Katsabanis, W F. Bawden

Understanding the mechanisms which are taking place during the propagation of a stress wave generated by an explosive charge is of high importance in the detection, characterization and prediction of blast induced damage to the rock. Vibrations caused by the detonation of an explosive are suspected to contribute significantly to the extension of the damage zone. Vibration monitoring close to a blasthole is a relatively new field of research, the hindrance being the scarcity of transducers capable of sustaining extreme accelerations without damage. This paper focuses on the vibration monitoring aspect of a blast induced damage study; the experiment took place at Queen's test site and was meant to record near-field vibration as close as 1 m from 100 mm diameter blastholes.

Jan 1, 1993

Jan 1, 1952

By E W. Kohler

Geophysical wireline logging of blastholes provides useful geological data and has considerable potential to improve overall blasting control and costs. This paper uses case histories to show how logging techniques have highlighted certain problems, and discusses the various in-hole tools available. In particular, the issue of the effects of hole diameter on explosive column height,and the importance of this when deck charging is addressed. The suitability and cost-effectiveness of currently available logging technology to the wide range of blasting applications is discussed.

Jan 1, 1988

The Institute thanks the following for their invaluable assistance, not only in assisting of the planning and organizing for the Vail meeting, but also for their tireless effort in transcribing, editing and processing the various speeches for these proceedings: Elizabeth Sturges-Murray Executive Assistant to the President Western Mining Operations W. R. Grace & Co. Jacklyn Grove Office Supervisor Mining Division W. R. Grace & Co Donna Hollister Further, the Institute announces the appointment of Doris G. Finnie as Secretary-Treasurer. Formerly Office Manager of K&P SALES ENGINEERS, INC., Doris has assisted for the past 15 years in registration for RMCMI. The Institute has opened an office at 777 Nile Street - Suite C Golden, CO 8040 1. Phone her at 3031278-1912 with any changes, corrections or suggestions.

Jan 1, 1982

By A. L. Holley

IN order to put sufficient work on steel ingots for rails, they must be reduced from about 12 inches square. As this cannot be done at one heat, they are first drawn down to about 7 inches square, and then reheated and rolled into rails. This first reduction or " blooming," is usually done in this country in a 30-inch 3-high rolling-mill, with movable rolls, so as to get several reductions in each set of grooves. The first of these mills has been running at the Troy Steel-works above a year, with great success. Another at the Cambria Iron-

Jan 1, 1873

Haematite Recovery from a Tailings Stream Laboratory and pilot scale testing were carried out in 1999 on a tailing sample from a North American iron ore plant using gravity, magnetic and flotation techniques. The ore contained 16 per cent iron mainly in the fine (-38 ¦m) size fraction. Two methods of evaluating the separation efficiency were used; Selectivity Index and Z factor analysis. Tabling and magnetic separation produced poor results, with flotation testing showing some promise, generating concentrates assaying more than 40 per cent Fe. High grade concentrates containing more than 67 per cent Fe were generated using the Kelsey Centrifugal Jig, and it was recommended that this technique be pursued at a larger scale to verify the results obtained.

Sep 13, 2010

INTRODUCTION The SAIMM publishes technical information on various aspects of the minerals industry through several different media. (a) Monograph Series Books in the Monograph Series are high quality, detailed discussions on specialized topics. (b) Symposium Series This series consists of the proceedings of international conferences which are held in South Africa. (c) Special Publications Series This series covers titles which do not form part of the Monograph and Symposium Series. (d) The SAIMM Journal Papers published in the Journal cover al relevant areas of technical interest by striving for a balanced content and maintaining a consistently high technical standard. (e) School and Colloquia Notes The papers from al local schools and colloquia are published and handed out at registration. Should authors wish to have their papers considered for publication in the Journal, they should adhere to the guidelines outlined below.

Jan 1, 1991

By M. B. Mirza, W. A. Sadik, B. T. Stanley

This paper presents the ventilation design for an underground testing facility in a salt medium. The under-ground workings consist of two 3.6 m-diam (12 ft-diam) watertight shafts and about 1830 m (6000 ft) of drifting. These facilities are designed to provide access for an in situ testing of a salt horizon in which a variety of hazardous and nonhazardous materials could be temporarily stored or permanently deposited. The ventilation system includes a design basis for gassy mine conditions and provides for the option of bulk air cooling and heating.

Jan 1, 1987

By James A. Pappas, Francis L. Fong, Tracy K. Lundin

The impact of environmental regulations on the quality of tunnel groundwater discharges is examined in this paper. Tunnel contractors usually depend on specialty contractors or outside consultants to deal with this issue without carefully examining their activities to minimize the production of contaminants. This approach may not be adequate given increasingly more restrictive environmental requirements. This paper surveys the general practice of the tunneling industry and attempts to identify sources of contaminants which may affect the total suspended solids, oil and grease content, and pH of the discharges. Strategies for treating the discharges are included. Field data and observations from several tunneling projects are also presented.

Jan 1, 1995

By John O. Marsden

The past fifteen years have seen a number of important developments in copper hydrometallurgy, including the commercial application of biological heap leaching of secondary (chalcocite-dominant) copper ores, the commercial demonstration of chalcopyrite concentrate leaching technology using pressure leaching and biological processes, and the application of novel configurations of solution extraction circuits. Significant emphasis is now being placed on the development of effective stockpile leaching practices for primary ores (chalcopyrite and bornite-dominant mineralization). Some of these developments have been highly successful, and will pave the way for further development and commercialization. Others have been less successful. These developments are reviewed in the context of the metal price cycle and trends for the future are identified.

Jan 1, 2006

By A. Le Kouby

We present in this paper the results of a parametric study carried out in a calibration chamber on instrumented model piles. The aim is to point out group effect on piles within a group through their resulting shaft friction and tip resistance. The methodology relies on the study of the influence of adjacent piles on a "reference" pile. The soil used is a silica sand (Fontainebleau sand). The influence of parameters like pile spacing, number of piles and installation order are evaluated. The results show a positive effect on shaft friction of the group effect and a negative effect on tip resistance. Efficiency factors are defined in order to have a better view on the parameters influencing the response of the pile within a group.

Jan 1, 2006

The optimization of management structure systems for coal mines is undertaken with the use of economic and mathematical models of the monitoring, manufacturing, and functional subdivisions of the systems. The main para- meter to be minimized is economic loss result ing from organization faults and this is achieved, in part, by optimum distribution of both technological objects and engineering and technical personnel. Models used are of the "gated" type, parameters for which are derived from analysis of manufacturing processes and from automatic information systems. The use of these models ofmanagement structures is only part of the process of optimization of those structures for coal mining operations.

Jan 1, 1977

By Lewis V. Wade

Barrett EA, Kowalski KM [1995]. Effective hazard recognition training using a latent-image, three-dimensional slide simulation exercise. Pittsburgh, PA: U.S. Department of the Interior, Bureau of Mines, RI 9527. NTIS stock number: PB95-170379. Beus MJ, Orr TJ [1995]. Computer modeling and analysis of the Greens Creek mine, Admiralty Island, AK. Spokane, WA: U.S. Department of the Interior, Bureau of Mines, RI 9530.NTIS stock number: PB95-176418. [ ]

ENGINEERS AVAILABLE (Under this heading will be published notes sent to the Secretary of the Institute by members or other persons introduced by members.) A member of the Institute who has had many years' experience in office management for prominent mining engineering and metallurgical companies, and who is now located in the West, would like to secure an executive position with a firm or company engaged in mining or metallurgy, located in the East, and preferably in New York. No. 139. Member, aged 36, married, graduate mining engineer, 14 years' active experience as engineer, superintendent, and manager of large coal-mining operations. Wide experience in development and operation of

Jan 10, 1914

Activated carbon is ideally suited to treating low grade ores and tailings by the carbon-in-pulp process and is rapidly replacing the use of zinc for recovering gold from cyanide leach solutions. Coarse carbon particles derived from coconut shell adsorb up to 30,000 ppm Au as a gold cyanide complex and can leave barren solutions containing

Jan 1, 1982

In recent years stricter requirements imposed variously by the Companies Acts, auditors and the Stock Exchanges have resulted in annual financial statements of mining companies becoming more detailed, informative and useful. Standards of reporting on ore reserves have not kept pace with the improvements in financial information disclosure, despite the fact that ore reserves are usually the most important asset of a mining company. The ore reserve reporting practices of fifteen leading Australian mining companies are analysed against important specific criteria. In terms of detailed and meaningful disclosure, there is scope for major improve- ments in annual ore reserve reporting Practices.

Jan 1, 1981

By S. T. Sorrell

To obtain a negative determination for prime farmlands in its approved lignite surface mine permit application, Phillips Coal Co. conducted a soils mapping effort and a historic land use survey. In addressing the justification for topsoil substitute materials, the company relied on results of a geochemical evaluation to demonstrate improved drainage, trafficability, and fertility. It also relied on results of field test plots. Post-mining land use was determined through the use of overlay maps considering existing land use, vegetation, and historic prime farmland. The reclamation plan incorporated these elements plus indicator species, existing vegetation, and wildlife needs.

Jan 1, 1985

A magnetometer survey 'was the Darkes Forest area between 1968. The instrument used was model MZ4 with sensitivity 9.4 conducted over part of 30th April and 3rd May, an ABEM torsion magnetometer gammas per scale division. The survey consisted of a closed magnetometer loop along lines cut for a previous magnetometer and seismic reflection survey by Wongela Geophysical in March, 1968. The magnetic results of the previous survey were not satisfactory in some areas and are presented as a comparison in instrumentation. Station separation in the present survey was 100 feet with tie-in readings at shot points of the previous survey (usually 1320 feet apart)

Jan 1, 1969

By A. W. Bryson, J. D. le Roux, B. D. Young

Several rate models for the adsorption of gold cyanide from aqueous solution onto activated carbon are given in the literature. The purpose of this study is to critically examine their ability to simulate the adsorption process over a wide range of conditions. An account is given of a comprehensive set of experimental work on the kinetics of gold adsorption onto a coconut shell- based activated carbon. Equilibrium isotherms were also determined. It is concluded that the homogeneous surface-diffusion model fits the experimental data reasonably well and provides a good balance between simplicity and descriptive accuracy. The model contains two parameters: the extra-particle mass-transfer coefficient and an effective intraparticle surface-diffusion coefficient. Both can be evaluated readily from simple adsorption experiments.

Jan 1, 1991