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By R. E. Tate, F. W. Schonfeld

In 1899, Lebeau1 reported the preparation of the compound Lis As through reduction of lithium arse-nate with carbon. Brauer and zint12 have described the preparation of Li3 As by combining the elements in liquefied ammonia and by melting the elements in a zirconia crucible coated with lithium fluoride. In 1953, at the Los Alamos Scientific Laboratory, LisAs and a previously unreported compound, LiAs, were prepared by the reaction of the elements. PREPARATION OF THE COMPOUNDS Attempts to form lithium-arsenic compounds by

Jan 1, 1960

By L. P. Teas

ALTHOUGH 1927 in the Arkansas-Louisiana territory will probably pass into history as a year of small profits and little new production, nevertheless during this period two large gas fields were developed; two new oil fields were discovered, and two new oil horizons, hitherto of minor Annual Production in Millions of Barrels FIG. 1.-PRODUCTION OF NORTH LOUISIANA AND ARKANSAS BY FIELDS FOR 1926 AND 1927. importance, were developed; In spite of the "hard times" some of the leading, supply houses did more business this year in this. district than in any year since 1920.

Jan 1, 1928

By Alan D. Hoagland

The Flat Gap mine, are important zinc deposit of the Appalachian type, is located in the Copper Ridge Belt in the Valley of Tennessee approximately 30 miles northeast of the Mascot-Jefferson City zinc district (Fig. 1). The ore is found in large stratigraphically linked deposits in solution and collapse breccias of the Kingsport, Longview and, to a minor extent, Mascot formations of Lower Ordovician age. The principal ore mineral is sphalerite and the principal gangue minerals are dolonmite and accessory pyrite. There is local minor galena and very rare barite and fluorite.

Jan 10, 1962

By W. J. Babyak, J. M. Sheehan, H. W. Paxton

THE- solubility of hydrogen and deuterium in solid niobium up to I-atm pressure has been established bv a number of workers.1-5 X-ray examination at room temperature of specimens reacted in hydrogen at high temperatures from 300° to 1000°C shows the presence of two phases—a bcc phase (a) based on the niobium lattice and with an u0, increasing from 3.30A for Nb to 3.32Afor NbHo.L, and an orthorhombic phase6n = 4.84A, h=4.90A, c =

Jan 1, 1960

By Richard P. Rothwell

The ores treated by the Canada Consolidated Gold Mining Company at Deloro, Ontario, have been described in a paper read before the Institute in 1881. They are gold-bearing arsenical sulphurets of iron (mispickel), carrying the theoretical proportions of 42 per cent. of arsenic, 20 per cent. of sulphur, and the remainder iron. The gangue is quartz, calc spar, and some talcose, slaty rock, evidently resulting from the decomposition of the wall-rock, which on each side of the veins is syenitic granite. The treatment of the ore consists of: 1. Crushing. 2. Concentrating.

Jan 1, 1883

By James D. Cribbes

The .paper examines some variables which influence the quality of iron ore pellets, and which may be modified to meet the specific requirements of blast furnaces and direct reduction processes. Quality parameters defining pellet physical strength, size structure and reduction behavior considered important by the operators of blast furnaces and direct reduction processes are listed. Laboratory results are used to illustrate how feed preparation, and pellet chemistry car1 be altered to meet these specific quality criteria and some aspects of the economic impact of quality demands on the pelletizing operation are discussed.

Jan 1, 1977

By Lowell B. Page

The White River Shale Project has completed a 5,000-foot production decline and a 30-foot diameter 1,010-foot deep shaft into its oil shale orebody in the Uinta Basin of eastern Utah. This is the first major underground access into these Green River deposits in this basin and provides an opportunity to establish and monitor in-situ rock mechanics stations as input to the mine engineering and planning of this large opening, high-tonnage mine. This paper discusses the history, mine development, and rock mechanics planning for this project.

Jan 1, 1984

By G. S. Hume

The production of petroleum in Canada is relatively small in proportion to the amount of oil consumed. Production figures are given in Tables 1 and 2, which show that the production in Alberta for 1934 was more than for the whole of Canada in 1933. The production of natural gas for Canada is shown in Table 3, In Turner Valley, the largest producing gas and oil field in Alberta, seven naphtha wells from the Paleozoic limestone and one crude oil well from Lower Cretaceous strata were completed during the year. Six-

Jan 1, 1935

By F. Bahnemann

IN discussing the problem of abnormal magnetic polarization, C. A. Heiland1? emphasized the unfortunate fact that our knowledge of the geological and physical conditions relating to such occurrences is very limited and that a more detailed insight into their physical causes would be extremely valuable for interpreting measured anomalies. He also pointed out that to arrive at quantitative physical formulas that would express the conditions that cause abnormal polarization many more occurrences of the kind would have to be recorded. The first part of this paper is a contribution to such descriptions.

Jan 1, 1935

TO THE BOARD OF DIRECTORS AND MEMBERS OF THE AMERICAN INSTITUTE OF MINING AND METALLURGICAL ENGINEERS GENTLEMEN: Submitted herewith are the report of the Treasurer for the year 1945 and reports for the same year of the following standing committees: Membership, Admissions, Papers and Publications, Mining and ' Metallurgy (Magazine), and Library. To these reports you are referred for additional details. Membership Membership, counting all categories other than Student Associateship, continues the upward trend of the last 10 years, reaching a total, as shown in Table 1, of 12,081. The net gain of 406 would

Jan 1, 1944

Stripping of the Exotica open-pit mine, which is proceeding at about 120,000 tpd, is dwarfed by its proximity to the 500-million-ton Chuquicamata tailing pile. The excavating work is being carried on smoothly and efficiently and, as of the end of October, accounts for the removal of 77 million tons of total material of which some 200,000 tons is stockpiled ore. Diamond drilling has outlined an orebody 5900 ft long and 3400 ft wide containing an estimated 153 million tons of ore at 1.35% recoverable copper based on 80 % extraction.

Jan 11, 1969

By Robert E. Reed-Hill, Edward R. Buchanan

A recent paper by Adams and vreeland30 describes dislocation density changes in zinc as a function of shear strain. The dislocation density was determined with the aid of an etching technique previously described by Brandt, Adams, and Vreeland.31 However, comparison of dislocation densities obtained by electron microscopy and this etching technique are not in good agreement, as will be shown below. Several zinc crystals of 99.999 pct purity were grown in air using a modified Bridgman technique.' These were annealed in air a 400°C for 1 hr and

Jan 1, 1969

By J. P. Witherow

The blast-filmace plant of the Crozer Steel and Iron Company was built under contract by Witherow & Gordon, of Pittsburgh, Pa. The furnace is 70 feet high by 16 feet bosh, tunnel-head 12 feet 8 inches, and hearth 9 feet in diameter. The columns are 20 feet high above furnace level, below which they extend 2 feet. The shell is 23 feet diameter at bottom and 19 feet at top. The plate iron is 3/8 inch at bottom, and tapers to 1/4 inch, the top ring being 5/16 inch.

Jan 1, 1884

By William E. Ford, Edward Salisbury Dana

268. The greater part of the specimens or masses of minerals that occur may be described as aggregations of imperfect crystals. Many specimens whose structure appears to the eye quite homogeneous, and destitute internally of distinct crystallization, can be shown to be composed of crystalline grains. Under the above head, consequently, are included all the remaining varieties of structure among minerals. The individuals composing imperfectly crystallized individuals may be: 1. Columns, or fibers, in which case the structure is columnar or fibrous. 2. Thin lamina, producing a lamellar structure. 3. Grains, constituting a granular structure.

Jan 1, 1922

The 114th(New York) Meeting of the Institute will be held in the third week of February, 1917. The committee on Papers and Publications has set Dec. 1, 1916, as the closing date for the receipt of manuscripts intended for this meeting. . Manuscripts must be received by the Secretary on or before this date. If they are sent through members of the technical committees they must be sent to those committees enough in advance of the time to be forwarded and in the hands of the Secretary by the time specified.

Jan 10, 1916

By E. B. Thornhill

In this paper on the recovery of mercury as sulphide, from the residues from the amalgamation and cyanide treatment of high-grade ores and concentrates, I will not discuss the many reactions, chemical and other- wise, that take place in the general process, but confine myself more particularly to the methods of recovering the mercury. I submit charts of two amalgamation-barrel charges, Figs. 1 and 2, which are self-explanatory. The flow sheet of the high-grade and the mercury extraction plants is showh in Fig. 3.

Jan 1, 1916

By Walter Kauenhowen

GeRmany's crude-oil production during 1936 totaled 3,112,494 bbl., an increase of 5.2 per cent over the 3,007,711 bbl. produced in 1935. The official monthly production figures published in 1936 report only the individual production figures of the three old established fields, whereas since 1936 official reports combine the production of all other fields into one figure. According to these published data, and using a conversion factor of 1 metric ton equaling 7 bbl., the oil production of Germany in 1936 was as follows:

Jan 1, 1937

By H. T. McAdams

Current theories of fracture maintain that brittle materials contain flaws or regions of weakness at which fracture originates. Whether a particular flaw grows depends upon the stress distribution in its vicinity and upon the presence of other stress relieving mechanisms capable of absorbing the applied energy. Under load, therefore, certain of these flaws will be activated, and the resulting fragments will have a size distribution determined by the spatial distribution of active flaws. Gaudin and Meloy,1 assuming a random occurrence of flaws, have derived the size distribution of fragments as

Jan 1, 1965

By Russell Millar

ACCORDING to the data of Maier and Ralston1 zinc vapor and carbon monoxide under the conditions in which they are present in a zinc condenser should, from a thermodynamic point of view, react to form zinc oxide and carbon, Zn (gas) + CO = ZnO (solid) + C. Calculations based on these results show that the gas mixture which is reducing to zinc oxide at the tempera-ture of the retort is oxidizing to zinc at the tempera-ture of the condenser. A series of experiments at the Pacific Experiment

Jan 9, 1928

By J. E. Warren

The mathematical problem considered by the author1 can be given another physical interpretation which is of some practical significance. The alternative physical problem involves the approximate behavior of a single well which is producing at a constant rate through an axially symmetric, horizontal fracture of infinite flow capacity which is located at the center, top or bottom of a uniformly thick, horizontal, homogeneous, anisotropic reservoir of infinite lateral extent which contains a single, slightly compressible fluid. Using Coats' asymptotic results, the wellbore pressure in the fractured system is given by the following equation.