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Late Mesozoic and Cenozoic Stratigraphic and Structural Framework Near Hopewell, Virginia

Description: From introduction: This study was undertaken as part of the U.S. Geological Survey's (USGS) Reactor Hazards Reduction Program. One of the goals of this program is to contribute to the growing recognition and cataloging of Cenozoic faults in the Atlantic Coastal Plain. Once the faults are recognized and cataloged, the stress field and resulting tectonic framework that produced these faults can be determined. This study defines the stratigraphic and structural relationships of a tectonically anom… more
Date: 1987
Creator: Dischinger, James B., Jr.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Mineral Resources of the Turtle Mountains Wilderness Study Area, San Bernardino County, California

Description: From abstract: At the request of the U.S. Bureau of Land Management, approximately 105,200 acres of the Turtle Mountains Wilderness Study Area (CDCA-307) were evaluated for mineral resources (known) and resource potential (undiscovered). In this report, the area studied is referred to as "the wilderness study area" or simply "the study area"; any reference to the Turtle Mountain Wilderness Study Area refers only to that part of the wilderness study area for which a mineral survey was requested … more
Date: 1988
Creator: Howard, Keith A.; Nielson, Jane E.; Simpson, Robert W.; Hazlett, Richard W.; Alminas, Henry V.; Nakata, John K. et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Mineral Resources of the Farlin Creek Wilderness Study Area, Beaverhead County, Montana

Description: Abstract: The Farlin Creek Wilderness Study Area (MT-076-034) is in the south-central Pioneer Mountains about 24 miles west-northwest of Dillon, Beaverhead County, southwestern Montana. At the request of the U.S. Bureau of Land Management, an area of 610 acres (less than 1 square mile) was investigated by the U.S. Geological Survey and the U.S. Bureau of Mines in 1984. The area contains no mines or prospects, no visible evidence of mineralization, and no identified mineral resources. Geophysica… more
Date: 1987
Creator: Pearson, Robert Carl; Hassemer, Jerry H.; Hanna, William F.; Hoover, Donald B.; Pierce, Herbert A. & Schmauch, Steven W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Mineral Resources, Geology, and Geophysics of the Worthington Mountains Wilderness Study Area, Lincoln County, Nevada

Description: Results of a survey of the Worthington Mountains Wilderness Study Area (NV-040-242) in Lincoln County, Nevada to determine mineral values, if any. The survey determined that metallic mineral (Cu, Pb, Zn, Au, Ag, W) resource potential within the study area is moderate, with level-B certainty, in the northernmost part, and it is low, with level-C certainty, in the remainder of the area. The report outlines the survey measurements and final results, with references and associated resource materi… more
Date: 1986
Creator: Du Bray, Edward A.; Blank, H. Richard, Jr. & Wood, Robert H., II
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Mineral Resources of the White Rock Range Wilderness Study Area, Lincoln County, Nevada, and Beaver and Iron Counties, Utah

Description: From summary: The White Rock Range Wilderness Study Area (NV-040-202/UT-040-216) is in Lincoln County, Nevada, and Beaver and Iron Counties, Utah, along the southern Nevada-Utah state line. Ursine, the town nearest to the study area, is about 15 mi (miles) southwest of the study area; the larger town of Pioche is about 30 mi southwest of the study area on Nevada Highway 322. A joint mineral resource appraisal of the 23,625 acre wilderness study area was completed in the summers of 1984 and 1985… more
Date: 1986
Creator: Toth, Margo I.; Stoneman, Rebecca G.; Blank, H. Richard, Jr. & Gese, Diann D.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Mineral Resources of the Far South Egans Wilderness Study Area, Lincoln and Nye Counties, Nevada

Description: From summary: During 1983 and 1984, the U.S. Geological Survey and the U.S. Bureau of Mines conducted field investigations to assess the mineral resource potential and appraise the identified resources of a part of the Far South Egans (NV-040-172) Wilderness Study Area. The area studied encompasses about 63.5 mi2 (square miles) (42,316 acres) in Lincoln and Nye Counties, Nevada, and is in the southern part of the Egan Range of east-central Nevada.
Date: 1987
Creator: Hedlund, David Carl; Davies, R. C.; Hovorka, Dirk S.; Blank, H. Richard, Jr. & Tuftin, S. E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Mineral Resources of the Parsnip Peak Wilderness Study Area, Lincoln County, Nevada

Description: From summary: The Parsnip Peak (NV-040-206) Wilderness Study Area in Lincoln County, Nevada, is 10 mi (miles) northeast of the small mining town of Pioche. A mineral resource study of the area was completed in the summers of 1984 and 1985 by the U.S. Geological Survey and U.S. Bureau of Mines. A small area of limestone and dolomite on the western side of the wilderness study area has high mineral resource potential for arsenic, antimony, mercury, and gold. The rest of the Parsnip Peak Wildernes… more
Date: 1987
Creator: Toth, Margo I.; Stoneman, Rebecca G.; Blank, H. Richard, Jr. & Gese, Diann D.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Mineral Resources of the Weepah Spring Wilderness Study Area, Lincoln and Nye Counties, Nevada

Description: From summary: The USGS (U.S. Geological Survey) and the USBM (U.S. Bureau of Mines) studied the mineral resource potential of 50,499 acres of the 61,137-acre Weepah Spring Wilderness Study Area (NV-040-246), Lincoln and Nye Counties, Nev., at the request of the BLM (U.S. Bureau of Land Management). In this report, the area studied is referred to as the "wilderness study area" or the "study area." Field studies of the area were conducted during summer 1984 by USBM geologists and during spring 19… more
Date: 1987
Creator: Du Bray, Edward A.; Blank, H. Richard, Jr. & Turner, Robert L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Birth and Development of Parícutin Volcano, Mexico

Description: From introduction: In this report the authors have attempted to present a strictly factual account of the birth and development of Paricutin volcano and avoid any interpretive opinions that might break the true narrative of events.
Date: 1956
Creator: Foshag, William F. & González Reyna, Jenaro
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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A Cooperative Investigation of Precision and Accuracy in Chemical, Spectrochemical and Modal Analysis of Silicate Rocks

Description: From foreword: This bulletin is the second of the series "Contributions to Geochemistry" which was begun in 1946 with Bulletin 950, "Contributions to Geochemistry, 1942-45". This series is the successor to earlier ones, also published as U. S. Geological Survey Bulletins, "Report of work done in the Division of Chemistry and Physics" (1879-1893), "Contributions to chemistry and mineralogy from the laboratory of the United States Geological Survey" (1900), "Contributions to mineralogy from the U… more
Date: 1951
Creator: Fairbairn, H. W.; Schlecht, William G.; Stevens, Rollin E.; Dennen, W. H. & Ahrens, L. H.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Optical Calcite Deposits of the Republic of Mexico

Description: From abstract: Many small deposits of optical calcite (Iceland spar) were discovered in the States of Chihuahua, Durango, Sonora, and Sinaloa from early in 1942 to late in 1944. Exploration that began in Sonora led to the discovery of commercial deposits in the eastern part of that State, and subsequently other deposits were found and mined in southwestern and northeastern Chihuahua and in western and central Durango. The largest deposits can be reached by foot or by horse in from 1 to 3 hours … more
Date: 1948
Creator: Fries, Carl, Jr.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Manganese Deposits of the Talamantes District Near Parral, Chihuahua, Mexico

Description: From abstract: The Talamantes district, 20 kilometers east of Parral in southern Chihuahua, has been the second largest producer of manganese ore in Mexico. Production, which started during World War I and has been more or less continuous since 1930, has totaled about 50,000 tons of ore with an average manganese content of 40 or 41 percent. The mines are on the Mesa de Talamantes, which is underlain by folded Cretaceous (?) limestone, overlain unconformably by gently dipping Tertiary rhyolite f… more
Date: 1948
Creator: Wilson, Ivan F. & Rocha, Victor S.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Manganese Deposits of Mexico

Description: From abstract: Manganese has been reported from 335 deposits in 20 of the 30 States and Territories of Mexico. The production of manganese ore prior to 1942, according to published figures, amounted to about 54,000 tons. For the year 1942 production rose to 35,000 tons, for 1943 to 70,503 tons, and for 1944 to 80,671 tons; but for 1945 it dropped to a little less than 52,000 tons, and during 1946 it continued to drop. Up to the end of 1941 Chihuahua had produced about half the manganese ore fro… more
Date: 1948
Creator: Trask, Parker D. & Cabo, José RodrÍguez, Jr.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Iron-Ore Resources of the United States: Including Alaska and Puerto Rico, 1955

Description: From introduction: The purpose of this report is to summarize available information concerning iron-ore resources in the United States in order to provide a general background for understanding and appraising the present status of this basic commodity.
Date: 1959
Creator: Carr, Martha S. & Dutton, Carl E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Geology of the Coastal Plain of South Carolina

Description: From abstract: The Coastal Plain of South Carolina extends from the Atlantic Ocean inland a distance ranging from 120 to 150 miles to the Fall Line, where it adjoins the Piedmont province. It includes an area of more than 20,000 square miles, or nearly two-thirds of the State, whose total area is 30,981 square miles, of which 494 square miles is water. The geographic divisions of the Coastal Plain are the marine coastal terraces, or "low country", which stand less than 270 feet above sea level,… more
Date: 1936
Creator: Cooke, C. Wythe
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Military Field Expedient Shielding Experiment

Description: Convair-Fort Worth, under contract to the U.S. Army Engineer Research and Development Laboratories, performed experiments to obtain data for use in applying field materials to shield portable nuclear-reactor power plants.
Date: October 18, 1960
Creator: Wheeler, D. M. & Bostick, L. H.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Dust Sources and Controls for Multiple-Machine Longwall Faces

Description: Abstract: Longwall mining in lower seam heights may necessitate the use of single-drum shearers to overcome size constraints associated with standard double-drum shearers. To avoid the operational problem of clearance in the tailgate entry with one single-drum shearer, two single-drum machines can be operated on the same face, with each shearer responsible for mining a predefined portion of the face. However, utilization of two shearers on the same face necessitates the positioning of one shear… more
Date: 1995
Creator: Colinet, Jay F. & Spencer, Ellsworth R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Timing and Duration of Subsidence Due to Longwall Mining

Description: Subsidence data gathered by the U.S. Bureau of Mines over a series of longwall panels in the Pittsburgh Coalbed were studied to obtain insight as to the role of time in the subsidence process. It was found that subsidence began essentially with undermining and was completed within 1 year. The progress of the subsidence was dependent upon location above the panel. Subsidence in the central area of the subsidence trough, where subsidence is the greatest, was about 90 pct complete by the time the … more
Date: 1995
Creator: Jeran, Paul W. & Trevits, Michael A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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An Adaptive System for Process Control

Description: Abstract: Researchers at the U.S. Bureau of Mines (USBM) have developed adaptive process control systems in which genetic algorithms (GA's) are used to augment fuzzy logic controllers (FLC's). GA's are search algorithms that rapidly locate near-optimum solutions to a wide spectrum of problems by loosely modeling the search procedures of natural genetics. FLC's are rule-based systems that efficiently manipulate a problem environment by modeling the "rule-of-thumb" strategy used in human decision… more
Date: 1995
Creator: Karr, Charles L.; Gentry, E. J. & Stanley, D. A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Rapid Separation of Heavy Rare-Earth Elements

Description: The U.S. Bureau of Mines investigated the separation of heavy rare-earth elements (REE) in an ion-exchange process. An ion-exchange column consisting of two sections, a loading section and a separation section, provides high levels of REE loading and good REE separation with an expected processing cycle of less than a month, while current ion-exchange technology requires more than 5 months. A different resin is used in each section: sulfonic resin in the loading section and iminodiacetic resin … more
Date: 1995
Creator: Moore, B. W.; Froisland, L. J. & Petersen, A. E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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