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By S. M. Flaherty, R. E. Scheffel, A. Guzman

Geochemical conditions within a leaching operation are heterogeneous. This variability arises mainly from hydrological controls imparted by physical characteristics of the ore and by heterogeneous metallurgical properties at the rock-fragment and industrial heap scale. The resulting chemical conditions are responsible for stratified mineral recovery, non-uniform extraction and prolonged leach cycles. This paper presents field data from a sulfide-leaching operation which clearly demonstrate the impact of chemical heterogeneity on metal recovery and the potential use of modern measuring techniques to facilitate operational monitoring and decision making for optimization of leaching operations.

Jan 1, 2006

By C D. Rawlings

An assessment is made of the potential for thick seam underground mining of black coal in Australia. A brief summary is given of the geo-mechanical environment and previous mining history existing in a number of areas of particular interest from the point of view of thick seam mining. A classification of thick seam mining methods is presented with emphasis on the critical geo-mechanical parameters influencing the performance of such methods. A summary is made of perceived geo-mechanical research requirements related to thick seam mining in Australian coalfields.

Jan 1, 1980

The 107th Annual General Meeting of The South African Institute of Mining and Metallurgy was held at The Country Club, Johannesburg, Napier Road, Auckland Park on Wednesday, 11 August, 2004. Welcome The President extended a special welcome to the guests and representatives of our sister institutes and other associations, also to recipients of awards, senior members of industry, Honorary Life Fellows, past-presidents, our members and other guests, among them the following: Ralph Bagirathi, Executive Member, African Mining Association Rudi Rudolph, President, Association of Mine Managers of South Africa Andrew Whibley, President, Association of Mine Resident Engineers of South Africa Dr Con Fauconnier, President, Chamber of Mines of South Africa Nxolisi Diliza, Chief Executive Officer, Chamber of Mines of South Africa

Jan 1, 2004

By W. K. Brisden

The SAG Milling Seminar, which was held at Murdoch University in Perth on 30th November and 1st December, 1989, was a very successful technical seminar. Organizer Dr Norm Stockton reported a total attendance of 130, which was higher than the 70 expected: 20 delegates came from the eastern States and the remainder were from Western Australia.

Jan 1, 1990

Tunnel Construction 90. London, Institution of Mining and Metallurgy, 1990. Reviewer: J.A. Cruise This is the published volume of papers presented at the Tunnel Construction 90 Conference, which was held in London in April 1990 under the auspices of The Institute of Mining and Metallurgy. Twenty papers are presented and their titles are listed below.

Jan 1, 1991

By Thomas E. Weyand, Wolfgang Baum

PMET is engaged in the development of reuse operations for process wastes from the natural resources industry. Most of the current remediation practices with mining wastes are concentrated on stabilization techniques. Once stabilized, valuable resources are no longer readily available for recovery and reuse. Additionally, stabilized materials, unless protected from weathering influences, pose lingering liability for the generator.

Jan 1, 1992

By T. O. Hagan

A system for the monitoring of micrcoseismic events. which is designed for use in feasibility studies of rock-burst prediction, has been operating at Western Deep levels Limited since 1977. Analyses have revealed that the presence and Orientation of geological discontinuities ahead of the mine face can be predicted from the data produced by this system.

Jan 1, 1981

California Oil and Gas Association, 510 West Sixth St , Los Angeles, Calif Edwin Higgins, Secretary This Association for many years published the monthly magazine, "Oil Bulletin " Publication was discontinued in June, 1932, and numbers are now available only in reference form Some of the articles in the magazine dealt with the geology and natural resources of gas and oil

Jan 1, 1933

By John C. Brulia

Blasting is both an art and a science with the primary objectives being safety and performance. Safety, the paramount objective, is a process that has limitless opportunities for improvement. Quality, a concept espoused by world-class corporations to competitively meet the needs of customers for goods and services, can be adapted to the explosives industry to improve blasting safety.

Jan 1, 1993

COLLOQUIUM AND GENERAL MEETING Developments in gold recovery processes A General Meeting and Metallurgical Colloquium on the above topic were held on Wednesday, 14th March, 1973, at Kelvin House, Johannesburg. Dr J. P. Hugo (President) was in the Chair. The colloquium was attended by 170 delegates, and was opened by the President at 9.15 a.m.

By A. A. Hazell

Mine management by objectives by A. A. Hazel The procedure of setting production targets is illustrated in Appendix I of the paper. This procedure is intended only as a guide although the standards on which it is based were established by work studies and found subsequently to be well within the limits of a trained crew.

By Gary B. Hemphill

Each year the demand for precision blasting increases due to the reduction in the amount of prime land. More site preparation and hone building requires blasting than they did a decade ago, Because of this increased need for blasting in more populated areas, the need for blasters and engineers knowledgeable in work involving blasting nets has increased.

Jan 1, 1978

By H. Z. Kuyumcu

In order to ensure a sustainable development in the mineral industries it is very important to reduce the process water consumption in mineral processing. Based on a systems analytical approach this paper deals with the most important parameters of process water management during plant operation and indicates strategies for reducing the water consumption in mineral processing.

Jan 1, 2003

By Charles M. Cooley

A NOTED Prospector Passes-Stories of the grizzled old prospector that discovered what turned out to be a famous and highly profitable mine, only to die in poverty through the shenanigans of "the Interests," are legion. It is pleasant, therefore, to be able to report that the discoverer of one of Canada's most famous mines was more fortunate.

Jan 7, 1953

It is a case study of huge rock-mass, loosened out from the parent rock-body, & posing a potential danger to structures down below the slope on which this rock mass was standing. Case was dealt in two phases, by tying/stitching the rock mass to the parent rockbody and breaking it using controlled blasting technique.

Jan 1, 1997

The Lake Superior Mining Institute, Ishpeming, Mich. A. J. Yungbluth, Secretary. An Annual Volume of Proceedings, carrying papers presented during the year, has been published since 1S83, with the exception of the years 1S97, 1899, 1907, 1916, 1918, 1919, 1920, 1921, 1924 and 1927. No meetings were held during those years and conse-

Jan 1, 1933

A review of the motivation of personnel in the open cut mining industry. The effect of social, geographic, environ- mental, organisational, union and other factors on employees' motivation as assessed from job experience and from an attitude survey. An appraisal of where we should be heading and what influence management can have on the motivation of employees.

Jan 1, 1980

By TH Kleine, AR Cameron

Size assessment of fragmentation is all about estimating the population of fragment sizes in the rock pile. A knowledge of the size distribution of particles can be used in applications from evaluating the stability of a waste dump, to optimizing a blast design to achieve a required fragmentation, to on-line control of a crushing and sieving operation.

Jan 1, 1997

By Eugene J. Schreiber, F. Newton Parks

Booz-Allen & Hamilton management consultants has recently completed a comprehensive study of Brazil's minerals and metals sectors for 40 leading international and Brazilian companies. The 220-page study describes the activities and Investments under way in 25 key commodities and assesses the current state of Brazil's economy, the impact on domestic minerals and metals industries, and government minerals policies.

Jan 12, 1977

The Institute conducts jointly with the American Society of Civil Engineers, American Society of Mechanical Engineers and American Institute of Electrical Engineers, certain activities as listed below, and is joint owner with them of certain properties. United Engineering Trustees, Inc. When Mr. Carnegie made. his gift ?for the erection of a suitable home? for the engineering societies,

Jan 1, 1943