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Attention is called to the changes in officers of the Committee, whereby Albert Sauveur becomes Vice-Chairman, and Herbert M. Boylston, Secretary. Three new members of the Committee have been added, as follows : J. Esrey Johnson, Jr., William Kelly, William R. Walker. The death of Dr. F. WV. C. Schniewind is a severe personal blow to the members of the Committee, as well as a loss on the technical side that will be hard to fill. During the absence of Mr. Kirchhoff in Europe the activities of the Committee will be under the charge of Professor Sauveur.

Jan 4, 1913

By G. S. Hume

As predicted a year ago, owing to the discovery in 1936 of crude oil on the west flank of the south end of Tuner Valley in the eastern foothills of Alberta, 50 miles southwest of Calgary, and the drilling activity that resulted, the production of crude oil in Canada during 1937 showed a very substantial increase over the previous year. The production from other parts of Canada is relatively small and shows slight variations only from year to year. The production of crude oil in Canada and the production in Alberta, the main producing Province, is shown in Tables 1 and 2.

Jan 1, 1938

By Joseph B. Darby, Paul A. Beck

IN isothermal sections of several ternary systems, the a-phase was found1 to extend in the form of a relatively narrow elongated field, connecting the U-phases that are present in the adjoining binary systems. This was interpreted in accordance with the conception that the U-phase is an electron compound and the ternary U-phase fields were shown in several systems' to extend approximately in the direction of constant average d-shell electron vacancy number per atom. ' However, in the various isothermal sections of the Fe-Cr-Mo system" the ternary a-phase field was

Jan 1, 1958

By P. L. De Bruyn

The behavior of collectors at the mineral-solution interfaces is usually explained in terms of an ionic adsorption process. Through the distribution of collector ions between the solid surface and the co-existing solution phase the mineral is believed to acquire a water-repellent surface coating. Quantitative adsorption studies have been made on simple flotation systems only within the last few years. Such investigations were made possible by the adoption of the radiotracer method of analysis. As a consequence of these studies a new parameter has been added to aid the understanding of the flotation process.

Jan 3, 1955

By William E. Ford, Edward Salisbury Dana

1. Normal Class (28) Gypsum Type 2. Hemimorphic Class (29) Tartaric Acid Type 3. Clinohedral Class (30) Clinohedrite Type Mathematical Relations of the Monoclinic System Crystallographic Axes. - The monoetinic system includes all the forms which are referred to three unequal axes, having one of their axial inclinations oblique. The axes are designated as follows : the inclined or clino-axis is a; the ortho-axis is b, the vertical axis is c. The acute angle between the axes a and c is represented by the letter 0; the angles between a and b and b and c are right angles. See Fig. 331.

Jan 1, 1922

By Peter Kos

Since advances in the understanding of gravity thickening reflects the development of knowledge about suspensions themselves, the paper starts with the discussion of flocculent and nonflocculent suspensions. The properties of flocculent suspensions and their behavior in different concentration regions (zone settling, channelling, compression) are defined and discussed. In the main portion of the paper, the behavior of flocculent and nonflocculent suspensions during batch as well as continuous thickening, is presented, together with a brief review of the gravity thickening theories and sizing methods. The classical as well as the most recently developed methods are presented and their use and limitations are discussed.

Jan 1, 1980

By A. L. Marshall, F. J. Norton

TO determine how rigorous a treatment was necessary completely to remove sorbed gases from molybdenum electrodes in vacuum tubes, the degassing process in high vacuum was studied in the temperature range 800° to 2300°C., and the gases analyzed. Some work was also done on the degassing of tungsten, nickel, and carbon. It was shown that the amount of gas is proportional to the mass of the sample and not to the surface area, indicating that the gas is distributed through the body of the metal. A study was made of the solubility of nitrogen in tungsten and molybdenum from 1200" to 2400" C., at equilibrium pressures from 0.01 to 760 millimeters.

Jan 1, 1933

The Library is a cooperative activity of the American Institute of Mining and Metallurgical Engineers, the American Society of Civil Engineers, the American Institute of Electrical Engineers and the American Society of Mechanical Engineers. It is administered as a public reference library of engineering and the allied sciences. It contains 133,000 volumes and pamphlets, 6700 maps and receives currently most of the important periodicals in its field. In order to place the resources of the Library at the disposal of those unable to visit it in person, the Library is prepared to furnish lists of references to engineering subjects, copies or translations of articles, and similar assistance. Charges sufficient to cover the cost of this work are made.

Jan 1, 1933

By A. Hasbi Hassan

Stibiotantalite is a relatively rare mineral not commonly found in the major tin districts of the world, and its separation characteristics have not been documented adequately in the literature. The investigation described here has been carried out on a sample taken from a commercial tin concentrate containing a significant amount of stibiotantalite which would have to be substantially removed before the tin concentrate was smelted. The sample originated from Greenbushes, Western Australia. A mineralogical analysis was performed on the sample with the aid of the Frantz Isodynamic separator 1 and the results presented in Table 1. A screen analysis was also performed, and the results presented in Table 2. The minerals were found to be substantially liberated.

Jan 8, 1979

The largest variety of asphalt and related bitumen deposits in this country is found in Utah. Utah is one of the few places in the world where the hydrocarbon minerals, gilsonite or uintaite, wurtzilite (trade name elaterite) and ozokerite are produced. These bitumens occur in an area embracing nearly 10.000 square miles in eastern Utah near the Colorado line. This area is largely in the western part of the Uintah basin. The bitumens are in the Tertiary horizon in the various divisions of the Eocene series. Cilsonite is an asphaltite derived from petroleum, wurtzilite is an asphaltic pyrobitumen derived from petroleum, and ozokerite is a native mineral wax resulting from the metamorphosis of paraffinaceous petroleum.

Jan 1, 1925

By K. D. Weverstad, J. E. Cleveland, J. C. Franklin, J. W. Black

A mined-out stope being backfilled with classified mill tailings was continuously monitored, both upstream and downstream, to determine the radon concentration associated with the mill tailings. The radon monitoring was done before, during, and after the backfill operation. Data taken during weekends when no mining activities were influencing the radon concentration showed a 90 percent reduction in radon discharge from the stope after being backfilled. Water used to mix with the classified sands showed an increase in the heavy metals concentration immediately after seeping from the inplace sand. However, the water used in backfilling is less than ½ of 1 percent of total mine water discharged. The change in contamination is not measurable at the pumping station.

Jan 1, 1982

By Pedro G. Salmon

The broad general distinction between primary and secondary batteries lies in the fact that in the former the current is produced by the consumption of one or both of the elements composing the cell, while in the latter the elements retain their form as such, and merely pass from one state of chemical combination to another. Much has been said in condemnation and but little in praise of storage-batteries; yet, notwithstanding the severe criticisms passed upon them, the skepticism with which electricians have viewed them, and the ignorance with which they have been handled, they continue to push their way into use. Their manufacture has now become a well-defined and established industry.

Jan 1, 1890

By R. Hogg, F. F. Aplan, P. B. Bradley, M. F. Placha

Particle size distributions of the solids fraction in typical coal preparation plant black water have been evaluated. The carbonaceous and mineral fractions were found to have distinctly different size distributions: the mineral matter being significantly finer than the carbonaceous material in all cases. Based on analyses of 13 samples obtained from the Appalachian, mid-continent and western regions of the US, it was found that, on the average, 83% of the mineral particles but only 41 % of the coal particles were finer than 44 pm (325 mesh). Typically, the size distributions of the mineral matter fraction tend to be bimodal, probably due to the presence of relatively coarse quartz, calcite, pyrite, etc., together with much finer clay particles.

Jan 1, 1981

By Milton H. Fies

THE Alabama Power Co. operates its Gorgas mine in Walker County, Ala., immediately adjacent to its steam plant. The coal mine property consists of some 19,000 acres of fee and mineral ownership lands, and all of the production from the mine-approximately 2500 tons per day-is utilized at the company's adjoining steam plant. The company is presently considering the purchase of additional acreage adjoining its present holdings which acquisition will almost double its reserves. The coal is transported from the mine over a short railroad spur in the company's own equipment, either directly to one of the large plants at Gorgas or to a storage pile. The longest haul is about 1 1/4 miles.

Jan 12, 1950

By L. G. Huntley

Introduction IN View of the recent advance made in the knowledge of the nature and conditions accompanying the occurrence of oil and gas, and of the recent activity in drilling in Wyoming, Montana, and western Canada, a discussion of the probabilities of obtaining production in such a reservoir as the Dakota sand in general, and in particular districts, is thought by the author to be timely and likely to result in more intelligent operating in certain parts of the territory underlain by this sand. In Canada particularly it is thought that these general considerations have equal if not more significance in a consideration of the oil and gas possibilities of the formations than have the various local conditions.

Jan 6, 1915

By D. G. Mickle, H. L. Hartman

Hydraulic filling was probably first used as a means of ground support in 1864 in an anthracite mine at Shenandoah, Pa. In the nearly 100 years since that time it has gained widespread acceptance, but surprisingly little study has been made of the basic features of the process. The investigations that have been made primarily concern the design of preparation processes and transportation systems, while little attention has been paid to ensuring that the fill does its job adequately after placement. Both permeability and compressibility of fills have been studied in the laboratories of the Department of Mining at The Pennsylvania State University under the sponsorship of the Mineral Conservation Section, formed to promote efficient utilization of the state's resources. Results of these studies form the basis of this article.

Jan 11, 1961

On June 25, Herbert C. Hoover and General Pershing were honored by Oxford University with the degree of Doctor of Civil Law. The ceremony was held in the Sheldonian Theater. It was the culminating feature of the annual L Ecnaenia, or commemoration exercises. Both General Pershing and Mr. Hoover were greeted-heartily when the group filed into the theater, the great audience rising as the distinguished visitors entered and proceeded to their .places on the rostrum. Others upon whom. the degree was conferred were Baron Makino, head of the Japanese Peace Conference delegation; Marshal Joffre of France, Vice Admiral Sir David Beatty, Field Marshal Sir Douglas Haig, Major Gen. Sir Henry Hughes Wilson, Chief of the British Imperial Staff, and' Vice 'Admiral' Sir Rosslyn Wemyss, First Sea Lord. Former Premier Orlando, of Italy, and Premier Ignace Paderewski, of Poland, received the degree by proxy.

Jan 8, 1919

By P. R. Gage, R. W. Bartlett

SILICIDE coatings on refractory metals are often applied by transporting a silicon halide vapor to a hot metal surface where dissociation or hydrogen reduction occurs. The subsequent chemical reaction to produce the coating requires diffusion of silicon or the refractory metal through the in situ silicide layer. This solid-state diffusion process step is often slower than the vapor-transport step and, therefore, rate controlling. This situation is analogous to the parabolic oxidation of metals in which the oxidation rate is controlled by diffusion through the oxide layer. The purposes of this study were to 1) measure the rate of formation of MoSiz and MoSi2 coatings under conditions such that the silicide diffusion process is rate controlling and lower silicide compounds are not formed and 2) determine by a marker experiment whether silicon or the respective refractory metals are the principal diffusing species in the disilicides.

Jan 1, 1965

By A. E. Weissenborn

Current knowledge of the substantial resources of zinc that exist in northwestern Washington is reviewed. These zinc-lead deposits are all associated with the Kootenay Arc, a narrow arcuate belt of folded and faulted rocks that dominates the regional structure of Stevens and Pend Oreille Counties and adjacent parts of British Columbia. The deposits of the Arc are only part of a major lead-zinc silver metallogenic province that includes the deposits of the Coeur d'Alene district and the famed Sullivan ore body of Kimberly, British Columbia. Most, but by no means all the zinc-lead deposits of the Kootenay Arc are in carbonate rocks. They occur in several stratigraphic units, and in different parts of the Arc are quite diverse in character. The deposits appear to have undergone a complex geologic history and have not necessarily all been formed at the same time or by the same geologic processes.

Jan 1, 1976

By James H. Courtright, Kenyon Richard

TOQUEPALA is a porphyry copper deposit in which mineralization is localized by a large breccia pipe formed in dose genetic relation to intrusive rocks. The deposit is in southern Peru, 55 airline miles north of the small city of Tacna and the same distance inland from the port of 110. Quellaveco and Cuajone, geologically similar deposits, lie 12 and 19 miles north of Toquepala. Chuquicamata is 400 miles to the south. The deposit is high on the southwestern slope about 20 miles from the crest of the Cordillera Occidental of the Andes Chain. It lies in a mountainous desert where the steep southwesterly slope of the Andes is dissected by a succession of rapidly downcutting, deep canyons. Local topography is moderately rugged with a dendritic drainage pattern and an elevation of 8000 to 14,000 ft. Volcanic peaks along the crest of the Cordillera rise over 19,000 ft.

Jan 2, 1958