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New York Paper - Remarks on a Gold Specimen from CaliforniaBy George W. Maynard
In the course of an examination of some of the California hydraulic mines in November last, I visited the property of the Gold Run Ditch and Mining Company, near Dutch Flat, Placer County. This is one
Jan 1, 1880
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Reservoir Engineering - General - Control of Injection Gas Composition in Enriched Gas-Drive Proj...By J. Jones-Parra, R. S. Reytor
The porosities of fractured limestone reservoirs can be divided into two broad types in accordance with their effects on fluid distribution and fluid flow. In the coarse porosity, gravity segregation
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Zinc IndustryBy R. A. Young
Zinc metal production in the operating plants in the United States during 1948 was approximately equal to that of the year 1947, although new developments during the year assure higher output in 1949,
Jan 1, 1949
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Mining Methods - Functions of Power Scrapers and Slackline Cableway Excavators (T. P. 799)By Harry A. Roe
The power drag scrapers and the slackline cableway excavator have been called "long-range excavators." Broadly, their field of usefulness is restricted to work in which their long range of action perm
Jan 1, 1938
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Mining Methods - Functions of Power Scrapers and Slackline Cableway Excavators (T. P. 799)By Harry A. Roe
The power drag scrapers and the slackline cableway excavator have been called "long-range excavators." Broadly, their field of usefulness is restricted to work in which their long range of action perm
Jan 1, 1938
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Inspiration's Successful Change to Open-Pit MiningBy H. C. Weed
THE Inspiration Consolidated Copper Co., located in the Globe-Miami district at Inspiration, Ariz., became a producer of copper in 1915. From 1915 until 1948, 116,278,000 tons of ore were produced fro
Jan 8, 1950
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Keynote Address: A view of commodity agreementsBy JAMES SCULLY
For the last 4 years political leaders have found a new subject on which they can safely generalize wihout creating opposition. That subject is commodity prices. Since the four-fold increase in OPEC c
Jan 1, 1978
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Virginia Paper - The Hydrometallurgy of Copper, and its Separation from the Precious MetalsBy T. Sterry Hunt
Jan 1, 1882
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Origin of the Arkansas Bauxite DepositsBy Joshua I. Tracey, Mackenzie Gordon
THE bauxite deposits in central Arkansas were formed by weather¬ing, in early Eocene time, of fresh or kaolinized nepheline syenite above the water table in a subtropical climate of fairly continuous
Jan 1, 1952
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On the Probable Existence of Microscopic Dia¬monds, with Zircons and Topaz, in the Sands of Hydraulic Washings in CaliforniaBy B. Prof. Silliman
THE occurrence of diamonds of some size in the gold-fields of California is by no means uncommon, and was noticed by me in a communication, to the California Academy of Science in 1867, when specimens
Jan 1, 1873
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Boston Paper - The Probable Existence of Microscopic Diamonds with Zircons and Topaz, in the Sands of Eydraulic ,Washings in CaliforniaBy B. Silliman
THE occurrence of diamonds of some size in the gold-fields of California is by no means uncommon, and was noticed by me in a communication, to the California Academy of Science in 1867, when specimens
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Physical Factors in the Metallurgical Reduction of Zinc OxideBy WOOLSEY MCA JOHNSON
INDEPENDENTLY of the recognized chemical reactions involved in the production of metallic zinc, the process is affected by physical conditions in efficiency, and by commercial as well as technical eco
Sep 1, 1907
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Geology - General Geology and Some Structural Features of the Courtland-Gleeson Area, Cochise County, ArizonaBy O. M. McRae
The Courtland-Gleeson area is in Cochise County about 15 miles east of Tombstone in southeastern Arizona. Rocks exposed in the area range in age from Pre-cambrian to Quaternary. The Precambrian is
Jan 1, 1967
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Technical Papers and Notes - Institute of Metals Division - In Sb-Sn SystemBy R. N. Zitter
PRESENT work was done in connection with a program for obtaining a low energy gap semiconductor suitable for photodetection. The inter-metallic compound InSb, which is now being in-
Jan 1, 1959
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Emissive Powers And Temperatures Of On-Black BodiesBy A. G. Worthing
Black: Bodies.-In the ordinary conception, a black object is an opaque object that reflects but little of the light that is incident on it. This means naturally that such an object is a good absorber
Jan 9, 1919
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Problems in Student EmploymentBy Arthur S. Huey
AS the end of the collegiate year approaches, the problem of student employment again becomes acute. This subject divides itself into two phases: (1) employment prior to graduation and (2) employm
Jan 1, 1932
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Mining - Blasting Theories and Seismic Waves. Part I: Resume of Recent Blasting TheoriesBy A. W. Ruff
In the last ten years large gains have been made in the field of blasting. These gains have been both in the theoretical and in the practical application of explosives. One of the most publicized chan
Jan 1, 1961
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Albany Paper - Water-Hoisting in the Pennsylvania Anthracite Region (Discussion, p. 923)By R. V. Norris
The removal of mine-water by hoisting in tanks instead of pumping, while somewhat a reversion to the methods of the ancients, has come very rapidly into favor in the anthracite region of Pennsylvania
Jan 1, 1904
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Philadelphia, Pa. Paper - Note on a Fire-BulkheadBy Charles M. Rolker
It is now three years ago that I wrote a paper on the fire which broke out in October, 1880, at the Chrysolite mine, Leadville, Col orado, of which I was at that time manager. The paper was read by ti
Jan 1, 1885
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Increasing Responsibility of the Engineer in Public LifeBy Mark Eisner
ONE'S JOB is the watershed down which the rest of one's life tends to flow write the Lynds in the first pages of their classic social study, "Middletown in Transition." Certainly engineers w
Jan 1, 1940