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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

The volumes of Transactions, which are published annually, contain the list of officers, rules, etc., the Proceedings, and the papers revised for final publication. (In this revision, after the preliminary publication, authors are permitted to use the largest liberty; and the changes and additions made in papers are sometimes important. It should be borne in mind by those who study or quote a paper in the preliminary edition, that they may not have in that form the ultimate and deliberate expression of the author's views. It should be added, however, that in the majority of cases there are no important changes.) These volumes are for sale as follows, in paper covers:

Jan 1, 1917

By George Frederick Kunz

The garnet-district of Bohemia is situated about 60 kilometers northwest of Prague, and is bounded on the north by Meronitz and Trebnice, 12 miles apart, and by Decany and Skan on the south. This region is covered with alluvium resting on the diluvium, which

Jan 1, 1893

By Merlyn B. Buhle

FOR the past 20 years electrical earth resistivity exploration has been used in Illinois in many phases of study undertaken by the State Geological Survey, chiefly in locating and outlining deposits of water-bearing sand and gravel from which to obtain ground water for municipal and industrial supplies. At least 43 municipalities in the state derive their total water supply from deposits of sand and gravel discovered by resistivity methods. These deposits occur in both Quaternary and preglacial valleys and within much of the glacial drift which covers .a large portion of the state

Jan 4, 1953

Reducing Fusion: The impure or low grade uranium concentrate is mixed with a formulated flux of sodium carbonate, salt, and sawdust or fuel oil and heated, while being stirred, to about 950°C. This reduces the uranium to the black, water insoluble uranium dioxide and with the exception of nonamphoteric metals forms water soluble sodium salts of the vanadium, alumina, silica, phosphates, and other constituents of the cake. The cooled melt is then water leached, leaving a residue of black insoluble uranium dioxide. "Green Sludge" Digestion and Liquor Purification: The green sludge is redissolved in acid, and by selective precipitation involving pH adjustments and a final neutralization

Jun 1, 1956

By John J. Van den Broek

As the established tailings disposal techniques do not meet the requirements of today, alternative methods of disposal are explored. McIntyre Mines Ltd., Coal Div. found a solution in the construction and operation of a tailings dewatering plant. The solids are recovered from the tailings slurry by means of mechanical dewatering equipment and are then dried in a unique drying system to provide an excellent thermal fuel for a power generating station.

Jan 1, 1983