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Dispersion Variance And The Grade-Tonnage Relationship - 7.1 Definition Of The Variance Of Dispersion
[The following notations will be used: O an ore body. z a point in O. z' another point in O. w0 (z) a point support of infinitely small dimensions w0 centred in z. w (z) a sample (or
Jan 1, 1978
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Review Of The Mineral Industries (Metals And Nonmetals Except Fuels) (8111a13c-5fba-46f4-ad27-90a538b86049)
By Kung-Lee Wang
SUSTAINED growth characterized the U.S. economy in 1964. Many new peaks were achieved in production, sales, employment, employee earnings, and business profits. At the end of 1964, the economy had exp
Jan 1, 1965
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RI 3607 Survey Of Fuel Consumption At Refineries In 1940 ? Summary (f1efc389-e9c3-4eba-8963-f97bc5925e7a)
By G. R. Hopkins
The average heat requirement per barrel of crude processed in the United states rose from 555,000 B. t. u. in 1939 to 579,000 B. t. u. in 1940, although crude runs increased from 1,237,840,000 barrels
Jan 1, 1942
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RI 3607 Survey Of Fuel Consumption At Refineries In 1940 - Summary
By G. R. Hopkins
The average heat requirement per barrel of crude processed in the United states rose from 555,000 B. t. u. in 1939 to 579,000 B. t. u. in 1940, although crude runs increased from 1,237,840,000 barrels
Jan 1, 1942
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Book News
1. New publications International minerals/metals review - 1982. Washington D.C., McGraw-Hill, 1983.720 pp. U.S.$1l7. Mining subsidence engineering, by Helmut Kratzsch. New York, Springer, 1983.580 pp
Jan 1, 1983
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IC 8848 Cobalt Availability - Domestic - A Minerals Availability System Appraisal
By G. R. Peterson
The Bureau of Mines evaluated the potential supply of cobalt from known domestic resources, both as a primary product from some deposits and as a byproduct from others, and found that U.S. production
Jan 1, 1981
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Some Criteria For Longwall Selection
By Anthony Sharkey
Introduction In Europe, longwall mining accounts for over 95% of coal produced from deep mines, whereas in the U.S.A., longwall accounts for less than 5% of deep mine coal production. There are many
Jan 1, 1981
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Mining Engineering REPORTER (37f61651-6902-4e0a-9a52-2d2ce6e71bba)
• The Venezuelan Trade Mission to the United States announced that Bethlehem Steel Corp. will begin exporting iron ore from its El Pao concession, south of the Orinoco River in Venezuela, in about thr
Jan 4, 1950
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The Production Control Problem
FOLLOWING the presentation of the papers by Messrs. Mahan and Butler, the discussion printed below ensued. A. C. LANE* With particular reference to the New England con-sumer, I entirely agree with M
Jan 4, 1928
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Use Of Satellite Imagery In The Study Of Geologic Structure And Roof Stability Relationships
By Thomas A. Simpson
Heretofore, underground coal mines in Alabama have operated under only 60 to 360 meters of cover: however, new mines (at least 5 in the early opening or development stages) will be operating under cov
Jan 1, 1975
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Leaching Tests On Chino "J" Dump Core Samples
By W. A. McKinney
The U.S. Bureau of Mines, Kennecott Copper Corp., and New Mexico Institute of Mining and Technology are cooperating on a research project to improve extraction of copper from previously leached waste
Jan 1, 1970
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Engineering of Cooks Lane Tunnel: An overview of challenges
By V. Nasri, S. Rashidi
The Baltimore Red Line Project is a proposed 22.7-km (14.1-mile) long east-west light rail transit (LRT) line envisioned to connect the areas of Woodlawn, Edmondson Village, West Baltimore, downtown B
Jan 1, 2014
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Suggestion of a Cause-and-Effect Relationship Among Coal Rank, Airborne Dust, and Incidence of Workers’ Pneumoconiosis
By Steven J. Page, John A. Organiscak
Prolonged exposure to airborne respirable coal mine dust is responsible for coal workers' pneumoconi¬osis (CWP): Furthermore, miners who show evidence of higher radiographic categories of simple
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Relationship between Porosity and Surface Deposit Coverage for Wire and Arc Additive Manufactured Aluminium Alloy 2319
By K. E. Harley, M. J. Whiting, T. J. Sabin, E. M. Ryan, J. F. Watts
"Wire and Arc Additive Manufacturing (WAAM) has the potential to enable a very significant reduction in buy-to-fly ratio compared to conventional manufacturing through the ability to build near-net sh
Jan 1, 2018
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Preliminary Production Report From the Bureau of Mines
A record $18.7 billion worth of metals, non- metals and fuels was produced in the U.S. during 1962, according to a year-end estimate from the USBM. The 1962 total value, based on preliminary statistic
Jan 2, 1963
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Trazadores litogeoquímicos de fertilidad del magmatismo vinculado a pórfidos de Cu (-Mo, -Au) en el sur del Perú, del Jurásico al Mioceno
By Alonso Marchena, William Martínez, Joel Otero
En Arequipa, Moquegua y Tacna se han definido diversos arcos magmáticos. En los arcos jurásico, paleoceno y oligo-mioceno ocurren pórfidos de distintas características, los cuales presentan diferencia
May 22, 2019
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MLA 22-88 - Mineral Resources Of The Slocum Creek And Upper Leslie Gulch Wilderness Study Areas, Malheur County, Oregon ? Summary
By John R. Benham
In 1987, at the request of the Bureau of Land Management~ the U.S. Bureau of Mines studied 7,600 and 3,000 acres, respectively, of the Slocum Creek (OR-003-075) and Upper Leslie Gulch (OR-003-074) Wil
Jan 1, 1988
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The Formation of Banded Epithermal Quartz Veins at the Golden Cross Mine, Waihi, New Zealand (259f22f9-c28d-4e93-a131-7c2df11c6c1d)
By Mauk JL, Arehart GB, Mathews SJ
The banded nature of the quartz veins which form the Empire lode at the Golden Cross mine, is perhaps their most striking feature. Petrographic studies show that significant differences occur between
Jan 1, 1995
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Field Activation Analysis of Uranium Ore Using 252Cf Neutron Source
By Phillip Philbin, Frank E. Senftle
A field neutron activation analysis technique suitable for determining uranium in ores has been tested. The method is based on the measurement of the 74.7 keV gamma ray from 'U. When the thorium/
Jan 1, 1972
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Shaft Construction By Raise Boring Through Artificially Frozen Ground
By D. E. Hart, A. R. Walsh, Derek Maishman
In order to safely construct a ventilation and escape shaft through saturated overburden into an operating mine, artificial ground freezing and raise boring were combined for the first time on a proje
Jan 1, 1991