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By F. Milton Lewis, James L. Coburn

In this paper the economics for a conventional comminution system, consisting of three stage crushing and one stage ball mill grinding, are compared to a semi-autogenous/ball mill comminution system. Capital and operating costs for a copper concentrator in Arizona at two levels of production, 20 and 40 thousand short tons of ore per day, are estimated. In order to minimize the investment and operating costs, large size equipment is selected for all four cases. These cost data are evaluated and conclusions are presented.

Jan 1, 1982

By Bailey, Lewis Newton

Bailey, Lewis Newton, Master Engineer, Senior Oracle, 4th Regiment, U. S. Engineers, Headquarters Company, died of pneumonia, at Camp Merritt, N. J., on April 30, 1918. Baird, Louis, Lieut., Royal Field Artillery, British Army, died on the battlefield in 1915. Ballamy, John H., Capt., 103d Engineers, killed in action near Fismes, Aug. 9, 1918. Burt, Andrew, died in active service, 1916. Cobeldick, William Morley, Royal Engineers, died from gas poisoning on October 7, 1915. Dougall, Ralph, 4th University Co., Princess Patricia Regiment, killed in action early in the war. Evans, Alfred Winter, Lieut.-Col., New Zealand Rifle Brigade, D. S. 0., D. C. M. killed in action on October 12, 1917. Gorman, Thomas C., Lieut., Canadian Engineers, killed in France, Mar. 18, 1918. Hague, William, 1st Lieut., Engineer Officers' Reserve Corps, died in active service, Jan. 1,, 1918. Hall, William T., Capt., Royal Flying Corps, killed in action, May 19, 1917.

Jan 11, 1918

By J. Sajkiewicz

In a synthetic way discussed are certain results of papers realized at the Wroclaw Technical University in a field of the theory of exploitation of machine systems with conveyor-belt transport. The attention is paid to the two lines in these works which are concerned with the development of analytical as well as simulation methods, in both cases realized with the help of digilat computers.

Jan 1, 1977

By William Kent

(Read at the Philadelphia Meeting, February, 1878.) IN the paper by Mr. Fernow, on Red Charcoal, read at the first session of this meeting, it was suggested that this fuel might be used in the blast furnace with greater economy than ordinary or black charcoal. In the discussion which followed the paper, it was stated that the charcoal furnaces of the Lake Superior District have used imperfectly burned charcoal with success, and that these furnaces have given the best results in fuel economy on record. On consulting some of our well-known metallurgical authorities the writer finds that the question of the use of red charcoal, or other imperfectly burned charcoal, or charred wood, is not at all new. In Percy's late work on Fuel, pages 409-414, are given a few facts, which are here condensed, as follows:

Jan 1, 1878

By Harold A. Krueger

FACILITIES and mining operations of the National Lead Co., St. Louis Smelting and Refining Division, near Fredericktown, Mo., are situated in a famous mining area. Copper, lead, nickel, and cobalt have been mined here for more than 100 years, work having been started on a high sulphide copper outcrop in 1847.

Jan 8, 1953

By M. C. Manderson

While the United States has been the world's largest volume producer and marketer of phosphatic fertilizers for many years, it has recently suffered heavy losses for a variety of reasons. While improved economic performance is expected, it is still at least a year or two away. But when recovery does manifest itself, it will likely yield only mediocre profits, due in part to the fact that about 50 percent of output is export-dependent. Therefore, there appears to be limited likelihood that profits will be adequate to justify the further outlay of large amounts of capital for expansion.

Jan 1, 1986

By Patricia Dillon

EHS Management Standards Communication and Reporting (8) ! Establish processes for internal and external communications ! Designate responsibilities for communication with COI ! Report as defined by senior management ! Report annually to employees, shareholders, COI on EHS and social performance Community Rights and Public Consultation (9) !Identify COI?s and establish process to hear concerns !Acknowledge and respond to complaints !Support local communities !Plan for closure and conduct public consultation !New projects include identification of COI?s, concerns to be considered in design

May 1, 2004

By Joe Maloney, Steve Shadow

Mining conditions at Cyprus Amax's Twentymile Coal Company (TCC) require the use of regenerative conveyors. Regenerative conveyors were first used in the Southwest Mine District and then in the challenging East Mine District. This paper will discuss the development and refinement of the equipment used to brake the regenerative conveyors.

Jan 1, 1998

By W. A. Rickelton

The first commercial use of phosphine derivatives as solvent extraction reagents began in the mid 1970's with the construction of several plants to recover uranium from wet process phosphoric acid. The process eventually adopted by all of these plants used the well known trioctylphosphine oxide (TOPO) in synergic combination with D2EHPA to extract U(6+). This prompted the development of other phosphine - based reagents and led to the discovery of a variety of interesting commercial and potential applications which are summarized in this paper. The applications include cobalt-nickel and niobium-tantalum separation and the selective recovery of silver and zinc.

Jan 1, 1994

By Ralph H. Sweetser

When a furnace-manager is '(blowing in," he generally has no time to consider the composition of the waste gas, and does not bother with it, except to take care that he does not get " gassed." Moreover, the analysis of the gases while the wood is still burning has not much to do with the economy of the normal working of the furnace; yet, on account of the deadly effects of the " blowing-in " gas when inhaled, and of its high explosive qualities, it is interesting to know its composition. In the Transactions there is no record of the analysis of the gas during an up-to-date " blowing-in." Even in Mr. Whiting's admirable paper (Trans., xx., 280) the reported analyses did

Jan 1, 1899

By Charles H. Jacoby

A decision was made by the management of International Salt Co. in 1960 to eliminate all waste products which were entering the waters of Lake Seneca. This was to be accomplished by the injection of waste slurries into an abandoned brine cavity. The effluent from the cavity was to be treated and used for the manufacture of salt or disposed by deep well injection into the Cherry Valley limestone. After several years of research and design, a construction permit was granted by the state of New York; the injection, recovery, and disposal wells were constructed and after a public hearing an operational permit was issued. A summary of the operational results of the system is given.

Jan 1, 1974

The following is a discussion of a new approach to safety when developing or applying a new mining technology. In the form of an engineering process, the following approach had its inception in the military and aviation industries and is also very strongly evident in the chemical industry.The process has been developed and applied in the mining industry by the author. It is called 'Incremental Development and Management of New Technology'.The process is a composite of carefully selected System Safety Management, System Engineering and Financial techniques and methods. It consists of modules which can be modified to suit the requirements of a specific project. Modules provide an organised framework of activities to facilitate a gradual acquisition of pertinent knowledge and information and to enable progressive evaluation or verification of produced outcomes against specified requirements.

Jan 1, 1992

By David Hoadley, Kenneth R. Maser, Ashok B. Boghani, James E. Billar, D. Randolph Berry, Mackenzie Burnett, Robert H. Trent

A. 3 Program Description The computer program developed to simulate events in the case of fire in the mine is described in this section The description is divided into three parts. 1. Program Capabilities This part summarizes what inputs can be changed, what outputs can be obtained and demonstrates program flexibility through suggested uses.

Jan 1, 1976

By Jorge Castillo

El presente texto señala el uso del polímero denominado quitosan para el proceso de floculaciòn de pulpas minerales. Dicho biopolímero es un derivado de la quitina proveniente del caparazón de langostinos, el cual es desechado por la industria langostinera peruana. El estudio, se realizó con pulpas de mineral del tipo sulfurado que van desde los 20 hasta los 36 % de sólidos, donde los mejores resultados de floculación se obtuvieron en medio cercanos al neutro y con una concentración de 0,2 % de quitosan y 0,2 % de ácido clorhídrico. En consecuencia, el biopolímero con un floculante industrial produce velocidades similares de sedimentación y menor altura de lodos en la zona de compactación.

Sep 12, 2011

By J. J. McKetta, O. L. Culberson

A preliminary investigation was made to determine the time required to attain equilibrium within the equilibrium cell for this system. Experimental and smoothed data are presented for the solubility of ethane in water for temperatures of 100°, 160°, 220°, 280" and 340 °F at pressures to 10.000 psia. The minimum solubility phenomenon disappears at 10,000 psia within this temperature range. INTRODUCTION .is a continuation of the investigation of the behavior of hydrocarbon-water systems, the experimental data on the solubility of ethane in water have been extended to 10,000 psia. The experimental apparatus, technique, materials, and analytical methods are essentially the same as previously reported.' TIME-CONCENTRATION STUDY Prior to the initial determinations of solubility in the ethane-water system. it was desired to establish the time

Jan 1, 1950

By R. H. Foley

It is difficult to consider any seam as unsuitable for longwall mining operation for something like 95% of British coal is produced by this system. The following is a brief report on how they do it-their techniques and equipment. Depth of working in British mines varies from about 150 ft to more than 3000 ft, with the average being about 1300 ft. Average seam thickness is approximately 40 in., but working seams vary from 16 in. to as much as 14 ft.

Jan 8, 1965

By Waclaw Dziurzynski, Janusz Tracz, Danny Wooton, Andrzej M. Wala

The purpose of this paper is to present validation studies of the mine-fire simulator using data gathered from an actual mine fire which occurred in November 1991 at the Pattiki Mine. This study evaluates the suitability of the computer software package for modeling underground fires. The paper also discusses the importance of the on-line monitoring system for the validation process.

Jan 1, 1995

By John L. Uhrie

Oxide stockpile leaching operations can realize increased copper recovery and decreased acid consumption from in-situ generated acid resulting from the oxidation of intentionally introduced pyrite recovered from mill tailings or other sources. While all oxide leach ores can benefit from pyrite addition, low acid consuming ores can show remarkably increased recovery and net acid generation; however, more highly acid consuming ores will show benefit more exclusively through increased copper recovery. Additional work shows that the value of highly acid consuming ores can be optimized by balancing copper recovery against acid consumption.

Jan 1, 1999

By William Kent

In the paper by Mr. Fernom, on Red Charcoal, read at the first session of this meeting, it was suggested that this fuel might be used in the blast furnace with greater economy than ordinary or black charcoal. In the discussion which followed the paper, it was stated that the charcoal furnaces of the Lake Superior District have used imperfectly burned charcoal with success, and that these furnaces have given the best results in fuel economy on record. On consulting some of our well-known metallurgical authorities the writer finds that the question of the use of red charcoal, or other imperfectly burned charcoal, or charred wood, is not at all new. In Percy's late work on Fuel, pages 409-414, are given a few facts, which are here condensed, as follows:

Jan 1, 1879

By M. S. Klima, A. P. Pinkerton

Solid-bowl (decanter) centrifuges are used extensively to dewater slurries in a wide range of industries. However, the application of decanters as classification devices is not as common. In this study, the performance of a continuous, pilot-scale, solid-bowl centrifuge was evaluated when classifying an ultrafine coal slurry containing nearly 60% material less than 10 µm. The test conditions included centrifuge howl and scroll speeds, volumetric feed rate, solids concentration and pond depth. Centrifuge performance was evaluated using size selectivity curves and the corresponding performance parameters, along with product yields and solids concentrations.

Jan 1, 2002