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By Daniel T. O’Brian

Exploration targets and results in the mining industry are commonly summarized in terms of tonnage and grade. Business appraisals require, as additional information, the expected profit or loss implied by the physical summary. The early incorporation of knowledge gained through financial analysis computations can provide a means for economically resolving many common exploration and development problems. Examples of such applications from the activities of exploration planning, reconnaissance, land acquisition, and development planning are presented in this paper.

Jan 1, 1969

By Alfred Weiss

Approximately 850 delegates from 24 countries met in Tokyo, Japan, May 24-27, for the second MMIJ-AIME Joint Meeting in 55 years, to exchange technical knowledge and experience in the fields of exploration, mining, metallurgy and petroleum engineering. The first such meeting was held in 1917 in Kyoto, Japan. Although the Mining and Metallurgical Institute of Japan was the sponsor, the entire meeting (machinery exposition, technical program, and tours) was a joint effort of the two institutes.

Jan 7, 1972

The Institute is custodian of funds for support of numerous gold medals and prizes and has representatives on boards awarding still others. Details regarding the Institute Awards are given below. The Institute is represented on the boards of the John Fritz Medal, the Hoover Medal and the Washington Award, in connection with the three national societies of Civil, Mechanical and Electrical engineering; and, also, in the case of the Washington Award, with the Western Society of Engineers.

Jan 1, 1929

By D. J. Christie, W. C. Hellyer

Three autogenous grinding flowsheets were considered as follows: 1) Primary autogenous grinding of a -8-in, primary crusher discharge to produce a product suitable for second stage pebble milling, or a flotation feed product in a single stage of grinding. 2) Intermediate autogenous grinding in which +4-in. rock media is screened from the primary crusher discharge and employed as grinding media to grind a tertiary crusher product to flotation feed size in a single stage.

Jan 8, 1972

By Rana P. Singh

Electrolytic metal reduction operatios in both aqueous and molten salt electrolytes are being studied by digital signal analysis. The purpose is to determine the relationship between the physical processes occurring in the cell and the frequency spectrum of the cell's fluctuating electrical parameters. The fast Fourier transform of cell voltage (in galvanostatic operations) or cell current (in potentiostatic operations) is computed on-line in real time for the electrorefining of zinc in aqueous acid chloride solutions.

Jan 1, 1984

By E. N. Pennebaker

The concept of "unitization" comes from the petroleum industry. Of this, Campbell says: "Unitization is the process whereby the owners of adjoining properties pool their reserves and form a single unit for the operation of the properties. The revenue from operation of this unit is then divided in accordance with the basis established in the unit agreement. "The purpose of such an agreement is to produce the reserves more efficiently and thus to increase the profit to every participant."'

Jan 8, 1973

By J. E. Strongman

This paper describes a system dynamics model of the international copper system. The development of the model is described regarding the questions it was designed to address, model boundary, major sectors and actors, the availability of data, the copper life cycle, and major supply and demand dynamics. A base forecast is presented describing future supply, demand, capacity, prices, trade flows, scrap flows and capital expenditures from 1976-1990 for the major producing and consuming market economy blocs.

Jan 1, 1977

By J. Van Oirbeek

The ash-fusion gas producer, blown with air preheated to a high temperature, was perfected by the Société des Houilléres de Saint-Etienne during the years 1920 to 1925, for the treatment of a mixture of ashy fuel and limestone. The temperature, about 1800° C., obtained by using hot air in running the producer, ensures the fusion of all the slag and the transformation into carbon monoxide of every particle of carbon contained in the materials treated.

Jan 1, 1937

By Joseph L. Mehaffey

A variety of chemicals offered by Armak were evaluated as dewatering aids for aqueous slurries of silica sand, sparsand and feldspar; an established commercial dewatering aid was used as a control. A number of Armak’s potential dewatering aids yielded lower moisture retention values than did the commercial product on all of the mineral samples. In addition to the chemical dewatering evaluations, some of the mechanisms involved in the removal of water from these mineral samples were examined.

Jan 1, 1984

By Walter L. Rice

It is a pleasure to report that the light metals industries are running well ahead of the growth schedule projected by the President's Materials Policy Commission. In the compilation of this survey on the five-year growth of our light metals industries, some gratifying facts come to light. By 1956, for instance, light metals consumption had increased more than 20 pct beyond Paley report expectations-a growth not anticipated by the study until the year 1960.

Jan 9, 1959

By Edwin A. Sperry

At the request of some of my engineering acquaintances, to whom the results became known, I submit the following description of the survey made by me for the underground tunnel-connection between the Riverside and Home coal-shafts, at Leavenworth, Kansas. The State law requires an escape-shaft; and as neither of the shafts had one, the two companies decided to make this connection in order to comply with the law and still escape the great expense of sinking

Jan 1, 1895

By Eugene Guccione

For at least 10 years, various industry people had warned about the alarming decline in the nation's oil and gas reserves. Then, in October 1973, the Organization of Petroleum Exporting Countries launched an oil embargo and sharply increased crude oil prices. Suddenly, everybody discovered the "energy crisis." In November 1973, former President Nixon advocated a Project Independence program so that ". . . by 1980 we shall be able to meet America's energy needs from America's own energy resources."

Jan 5, 1975

By T. W. Martin, T. J. Crocker, J. M. Goris

The current technology of large rock conveyors is reviewed. Based on this investigation two large rock conveyor concepts have been developed and a test facility investigation designed and fabricated. The USBM will test these concepts along with loading and transfer points for handling mine run rock material up to 1.5 m (4.9 ft) in size. An evaluation of open pit mining systems using large rock conveyors documents substantial cost savings when compared to truck haulage.

Jan 1, 1983

By Robert B. Hill

A history of gravity classification shows the development of many types of equipment with several prominent types continuing in use today. Part of the development and evolution is the spiral classifier. Data will be presented showing characteristic size separations in a closed circuit grinding operation. Comparisons with hydro- cyclone operation will be shown including operating cost comparisons. Effects of variables will be shown in spiral classifier operation. Finally, other uses for spiral classifiers will be described.

Jan 1, 1982

By Walter C. Labys, Fereidoon Shahrokh

This paper presents an application of computer simulation methods to the modeling and forecasting of the United States coal market. The computer methods employed as well as the model constructed are based on economic and econometric theory. The contents of the paper include a description of the coal market, the corresponding computer model, tests of model validation, computer generated scenarios for the period 1980-1985, and comparisons of the scenarios generated with that of other major coal forecasts.

Jan 1, 1983

By Kung-Ping Wang

The mineral potential of the Far East, important to the United States for tin and tungsten as well as other minerals, is set forth in this first installment of a two part article by a specialist in the Far Eastern field. In this installment the mineral and resource picture of China, Japan, Korea, and Formosa are discussed. The second installment, in December, will cover Hong Kong, Indo-China, Thailand, Burma, Malaya, Indonesia, the Philippines, and British Borneo.

Jan 11, 1951

By R. A. Irvine

The use of large vibrating screens presents unique challenges to the screen manufacturer, the plant designer, and the plant operator. The design of vibrating structures that span greater unsupported distances is critical to the reliability of a screen subjected to billions of fatigue cycles. Larger percentages of total plant production become dependent upon fewer, larger vibrating screens. Plant designers and operators must plan for equipment maintenance in a manner which optimizes the production availability of large vibrating screens.

Jan 1, 1985

By Fred P. Dewey

The product of the Muirkirk, Md., furnace has always enjoyed a very high reputation for strength ; and this is supported not only by its behavior in practice, both alone and in mixtures, but also by the following series of tensile tests, made at various times during the last fourteen years: South Boston Iron Co., November loth, 1874. Strength. Pounds Grade. per square inch. Density. No. 3,....... 30,685 7.2794 No. 4,....... 35,140 7.2713

Jan 1, 1889

By M. T. Erickson, C. A. Rowland

Ball mills 5.5 m (18 ft) in diameter and larger tend to use energy delivered to the mill less efficiently than smaller diameter mills, particularly when the large mills carry 40% by volume ball charges. This paper will explore factors used in scaling up ball mills, showing where the advantages of one factor can possibly be negated by another factor. The paper will propose possible operating limits and areas for further study to establish selection and design limits.

Jan 1, 1985

By D. F. Coolbaugh

Asia, the largest and most populous continent, has had little political influence on world affairs until very recently. The picture is rapidly changing. Although the cultures of various Asian countries differ widely, today they are united in their desire to industrialize. This desire is the key for expansion of Asian mineral production. The following discussion deals primarily with the situation in the south and southeast Asian countries -India, Pakistan, Burma, Thailand, Cambodia, Laos, South Vietnam, Malaya, and Indonesia.

Jan 10, 1960