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FREDERICK G. BRENNEMAN Frederick G. Brenneman died of pneumonia at his home at Pottsville, Pa., on November 24. He was in the class of 1912, of the Pottsville High School, attended Bellefonte Academy, and graduated from the Colorado School of Mines, at Golden, Colo., in 1916. He is survived by his parents, Mr. and Mrs; Philip Brenneman and three brothers, Louis P. and Robert C. at home, and John :F., of Camp Merritt, N. J. Mr.

Jan 1, 1919

By William I. Rau

This presentation will examine the role commercial banks will be expected to assume in financing international minerals projects, including a discussion of various financing techniques such as project loans, production loans, and production payments. A discussion of the necessity for completion guarantees, finalized sales contracts, reserve evaluations, management contracts, and marketing undertakings in conjunction with financing availability are also included.

Jan 1, 1981

By Kent A. Pease

Design methods for foundation anchors and sockets constructed in rock are based largely on empirical correlations which yield a reasonable estimate for initial capacity, but do not address the general concerns of failure mode and load-displacement behavior. This paper focuses on the behavior of foundation-rock interfaces and shows that interface behavior under increasing load results in a progression from an elastic response to secondary behavior, in which interface failure occurs, and finally to a residual stage at large deformations. Procedures to follow this progression are outlined to provide a more fundamental understanding of the problem.

Jan 1, 1984

By F. Rosenblum

An on-stream particle size analyzer (PSA) based on the sedimentation principle has been developed to the commercial prototype stage and tested at a concentrator. The current instrument gives a direct reading of the weight % finer than any two sizes, although the capability exists for providing a complete size distribution through the sieve and sub-sieve range. The readings obtained at intervals of about 10 minutes are derived from 0.5-L samples of slurry cut from the monitored stream. The accuracy of the PSA meets the requirements of process control.

Jan 1, 1984

By J. L. Christie, W. R. Webster, R. S. Pratt

Since the delivery of our paper on Some Comparative Properties of Tough-pitch and Phosphorized Copper,1 a new brand known as "oxygen-free high-conductivity copper" (brand OFHC) has become available to consumers. It was thought desirable to make a comparison between the properties of this material and those of the materials covered by our original paper and its discussion. Preliminary tests had indicated some notable differences. A billet of oxygen-free high-conductivity copper was taken from regular production. A chemical analysis of the particular billet was not made, but the producer of the material has given as typical the analysis shown in Table 1. The

Jan 1, 1933

By W. C. Hazen, A. V. Henrickson

URANIUM plant operations of the Kerr-McGee Oil Industries at Shiprock, N. M., began in December 1954. As originally designed, the plant treated Plateau carnotite ores by the acid cure process, which dissolved both uranium and vanadium minerals. After 16 hr of acid curing, the ore was conveyed to an agitator and leached for 2 hr in acid liquor at a pH of 1.0. The leach pulp was then separated at 100 mesh in a classifier, the sands continuing through a washing classifier circuit and the slimes going to a countercurrent decantation system of four thickeners.

Jan 9, 1957

By R. W. Raymond

The idea of obtaining light from incandescent solids is not new; nor is it. new to make such bodies incandescent by holding them in a heating flame. But the successful combination of the right substance and form of the body to be heated with the right kind of flame and the right means of adjustment, has not, to my knowledge, been accomplished heretofore; and it seems to me that the matergas incandescent light of Mr. Otto Fahnehjelm of Sweden, in which these objects appear to have been secured, is destined to become both famous and useful. The first fact upon which this invention is based, is the intense

Jan 1, 1885

E. DEGOLYER,-New York, N. Y. (written discussion*).-Since the eastern part of the Gulf Coastal Plain is receiving considerable attention from various operators at the present time, it occurs to me that it brief review of most recent operations may be of interest in this connection, as well as a discussion of some of the points suggested by Mr. Hager. During the latter part of January, 1918, the Alahoma Oil Co. completed and abandoned a 3400-ft. (1036-m.) dry hole in Section 25, Township-8 North, Range 1 West. This well was drilled near the axis of the

Jan 4, 1918

By E. J. Rapperport, C. S. Hartley

I TTRIUM is a close-packed-hexagonal metal with a c/a ratio of 1.5712.1 This low c/a value prompted a cursory examination of the deformation modes to obtain more data on the deformation characteristics of hcp metals with subideal c/a ratios. The chemical analysis of the arc-melted stock from which the specimen was cut is given below in Table I.

Jan 1, 1960

By A. C. Rand

The invention to be described in this paper is the work of Frederic A. Halsey, Engineer for the Rand Drill Company, of New York, and its use mill abridge the notable wastefulness of power of the striking rock-drill, and, at the same time, increase its capacity for work. That the older type of rock-drill is wasteful in power, is generally admitted; the cause being the use of steam* without expansion, arid the "cushion" of the blow, by the incoming steam upon the lower † end of the piston before the cutting tool strikes the rock.

Jan 1, 1885

By C. M. Marquardt

Tramp iron and steel moving on a conveyor belt cause small currents to be generated in a coil situated in a strong magnetic field, which are converted to an alternating current and are amplified. The output voltage from the amplifier fires a thyratron with a relay in its anode circuit, which actuates a howler and simultaneously drops a spot of marker material on the belt.

Jan 6, 1950

CHAIRMAN (J . E. JOHNSON, J R., New York, N. Y.).-It may be n matter of some interest that sodium cyanide is now being made commercially by melting together in an electric furnace calcium cyanide with a common salt, which produces calcium chloride and sodium cyanide. It seems to me entirely possible that you have here about the same results that would be obtained by melting calcium chloride and ordinary cyanide together, only you obtain it a good deal cheaper. There is no doubt about that reaction once it is being carried on on a large industrial scale for the manufacture of cyanide for other uses. I think probably the same, thing takes place here, with the possible exception of lowering the melting point due to the presence of the calcium chloride.

Jan 5, 1919

Today, the employment of the modern hammer drill, using hollow steel, with air or water to expel the cuttings from the drill hole, is the rule rather than the exception in practically all rock-drilling operations. There is considerable carelessness in the matter of keeping the hole in the drill steel properly opened. Plugged steels wholly or partially, prevent proper operation of the drill, whereby drilling speed is retarded, water tubes are bent or broken, and time is lost in tink-ering, or, as often happens, the drilling gang is idle while someone makes a trip to the shop after another drill steel or water tube. To relieve this condition, the Ingersoll-Rand Company has developed, as an auxiliary to the Leyner sharpener, a new device-the Leyner shank and bit punch.

Jan 4, 1918

By Jan M. Mutmansky

Main purpose of the research described is to apply the method of computer simulation to the process of tunneling by rapid excavation methods. Primary attention was focused on the materials handling subsystem because of its potential for improvement from a systems standpoint. A description is given of the computer model and a summary of some applications of the model for improving the rapid excavation process is included.

Jan 1, 1975

Arizona ROBERT W. THOMAS, Chairman 'ROBERT W. HUGHES, Vice-Chairman HUBERT O. WOODS, Secretary-Treasurer American Smelting & Refining Co., Hayden, Ariz. FRANK A, WARDLAW, JR., National Director THOMAS C. CHAPMAN P. D. I. HONEYMAN CARL H. COLE JOHN E. LANNING. JOHN H. DAVIS JOHN C. LOVING EDW. G. DENTZER ALBERT MENDELSOHN MORRIS G. FOWLER BRENT N. RICKARD H. C. HENRIECHARLES F. WILLIS Black Hills BANCROFT GORE, Chairman N. P. GOODRICH, First Vice-Chairman C. N. KRAVIG, Second Vice-Chairman C E. SCHMIDT,

Jan 1, 1941

By J. D. Vincent, Paul A. Weyler

Climax Molybdenum's plan for the Henderson 30,000 tpd molybdenite plant didn't just happen. It slowly evolved over a period of 3% years. Many plants cannot afford similar delays, but the Henderson project will take about 10 years to complete from the time the orebody was first discovered until production begins. Pilot plant testing results with both the single stage and two-stage semi-autogenous grinding circuits were highly favorable in terms of operating costs reduction-so much so, that the Amax subsidiary made the decision to go with semi-autogenous grinding for the Henderson mill.

Jan 5, 1972

By A. B. Wood

In welding and metal working by electricity, two systems are in use,—the so-called. incandescent system, in which the material operated upon is traversed by currents of large volume and low electro-motive force, the current having a continuous metallic circuit during the welding operation, and the arc system, in which the electric arc is utilized. It is the purpose of the present paper to call attention to this last

Jan 1, 1892

By George R. Huebner

The present mine at White Pine has been extracting low grade copper ore by mechanized room-and-pillar methods for approximately eleven years. Increasing depth of mining is decreasing the extraction ratio. It is desirable to mine a higher grade product by extracting values only and increase recovery of the available natural resource. These factors led to the consideration of a caving method such as longwalling. GEOLOGY The White Pine orebody consists of two mineralized shale horizons separated by a relatively barren zone of shale and sandstone. These gently dipping sediments lie at the base of the Nonesuch shale formation and are of late Precambrian age.

Jan 12, 1964

By G. Rinelli, A. M. Marabini, V. Alesse

Salicylaldehyde, a chelating agent for tin, has been found to function as a collector for the flotation of cassiterite. Infrared and nuclear magnetic resonance studies clearly show that salicylaldehyde can form a chelate compound in bulk and at the surface. Results are also given for the flotation of a tin ore with this reagent.

Jan 1, 1976

By H. D. Dahl, P. C. Thakur

This paper presents an analysis of a new tool for improved productivity in coal mining: the horizontal drilling system developed by Conoco/Consol. The analysis includes a brief description of the system; discussion of the three categories of advance exploration application of horizontal boreholes; and a survey of other special mining methods planned around long horizontal boreholes.

Jan 1, 1983