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Vilcabamba Uranium Deposits, Cuzco Department, Peru

Description: Abstract: In 1957 uranium was discovered in the Vilcabamba district on the north flank of the Cordillera Vilcabamba, part of the Cordillera Oriental. This district contains principally small copper-nickel veins. Small lenses of uraninite occur in calcite veins cutting Permian Copacabana limestone. Uranium is most abundant marginal to centers of strongest copper-nickel mineralization. Leaching and oxidation are virtually absent because of Pleistocene glaciation. Four separate areas in which uranium has been identified are Huamanapi, Calderon, Minasmayo, and Negrillas. The Puntarayoc area, near Pampaconas, is considered a separate district. The deposits have been tested by trenching, drilling, and sampling concurrently with geologic reconnaissance mapping of the surrounding region.
Date: October 1962
Creator: Gabelman, John W.

Subsurface Fracturing from Shoal Nuclear Detonation: Final Report

Description: Abstract: A fracture-evaluation experiment in conjunction with the Shoal nuclear detonation in granite was undertaken to determine the extent of subsurface shock-induced fractures. Preshot and postshot geophysical logs in a hole drilled from the surface through the zone of fractures indicated that fractures extended at least 5.3 cavity radii laterally from the point of detonation. Quantitative measurements of permeability increases resulting from the detonation were planned, but were not completed because of adverse test-hole conditions. General descriptions of the Shoal Project, geology of the test site, and other effects of the detonation are included.
Date: June 1964
Creator: Atkinson, Charles H.

Geologic Study of the Sedan Nuclear Crater

Description: From introduction: The purpose of this study was to map the geology of the (Sedan) crater shell and relate the information gained to shell configuration and cratering mechanics. Hopefully, the data presented will be of use in planning future nuclear cratering experiments.
Date: May 1964
Creator: Richards, William D.

Total Cloud Activity Measurements

Description: Abstract: Gamma radiation detectors in three fixed ground stations and in a helicopter were used in an attempt to measure the total radioactivity as a function of time for the dust cloud produced by the Sulky event. Large plastic s cintillators, photomultiplier tubes, and crudely collimated lead shields were the basic components of the detectors. A constant- current, variable -voltage regulator circuit enabled the detectors to operate in very high as well as in low radiation fields. Because the Sulky event did not crater as expected, there was no large radioactive dust cloud for the detectors to observe. Instead a small dust cloud of relatively low activity was produced, followed immediately by a continuous stream of much more radioactive gas which flowed from the resulting pile of rubble for a considerable length of time.
Date: May 1965
Creator: Gaines, Jerry L.

Interim Report on Geologic Investigations of the U12e Tunnel System, Nevada Test Site, Nye County, Nevada

Description: From introduction: The maps and tables comprising this report are being transmitted at this time to provide interested users with a summary of the geology of the Ul2e tunnel system. The system was constructed to provide access to underground test sites. This report contains part of the geologic information obtained from investigations conducted by the U. S. Geological Survey to determine the geologic environment of the underground test sites. Results of geophysical and radiometric surveys, and physical properties are being studied. This work was done on behalf of the U. S. Atomic Energy Commission.
Date: September 1960
Creator: McKeown, F. A. & Dickey, D. D.

Beryl-bearing Pegmatites in the Ruby Mountains and Other Areas in Nevada and Northwestern Arizona

Description: From abstract: Pegmatite occurs widely in Nevada and northwestern Arizona, but little mining has been done for such pegmatite minerals as mica, feldspar, beryl, and lepidolite. Reconnaissance for beryl-bearing pegmatite in Nevada and in part of Mohave County, Ariz., and detailed studies in the Dawley Canyon area, Elko County, Nev., have shown that beryl occurs in at least 11 districts in the region. Muscovite has been prospected or mined in the Ruby and Virgin Mountains, Nev., and in Mohave County, Ariz. Feldspar has been mined in the southern part of the region near Kingman, Ariz., and in Clark County, Nev.
Date: 1960
Creator: Olson, Jerry C. & Hinrichs, E. Neal

Chromite and Other Mineral Deposits in Serpentine Rocks of the Piedmont Upland, Maryland, Pennsylvania and Delaware

Description: From abstract: The Piedmont Upland in Maryland, Pennsylvania, and Delaware is about 160 miles long and at the most 50 miles wide. Rocks that underlie the province are the Baltimore gneiss of Precambrian age and quartzite, gneiss, schist, marble, phyllite, and greenstone, which make up the Glenarm series of early Paleozoic(?) age. These are intruded by granitic, gabbroic, and ultramafic igneous rocks. Most of the ultramafic rocks, originally peridotite, pyroxenite, and dunite, have been partly or completely altered to serpentine and talc; they are all designated by the general term serpentine. The bodies of serpentine are commonly elongate and conformable with the enclosing rocks.
Date: 1960
Creator: Pearre, Nancy C. & Heyl, Allen V., Jr.

Geology and Fluorspar Deposits, Northgate District, Colorado

Description: From abstract: The fluorspar deposits in the Northgate district, Jackson County, Colo., are among the largest in Western United States. The mines were operated intermittently during the 1920's and again during World War II, but production during these early periods of operation was not large. Mining was begun on a larger scale in 1951, and the district has assumed a prominent position among the fluorspar producers in the United States. Within the Northgate district, Precambrian metamorphic and igneous rocks crop out largely in the Medicine Bow Mountains, and later sedimentary rocks underlie North Park and fill old stream valleys in the mountains.
Date: 1960
Creator: Steven, Thomas August

Manganese Deposits in the Drum Mountains, Juab and Millard Counties, Utah

Description: From abstract: The Drum Mountains are in west-central Utah 30 miles northwest of Delta, between the Sevier Desert on the east and Whirlwind Valley on the west. It is a typically barren desert range comprising a westward-tilted structural unit in which is exposed as much as 9,000 feet of quartzite (Cambrian and Precambrian?) and 3,000 feet of carbonate rocks of Cambrian age. These beds, which strike northward and dip west, are cut by myriad east- to northeast trending faults with displacements of a few feet to a few thousand feet. Quartz monzonite dikes, pebble dikes, and vein deposits are present locally along the faults. The Cambrian rocks are overlain unconformably by volcanic rocks of probable Tertiary age.
Date: 1961
Creator: Crittenden, Max D., Jr.; Straczek, John A. & Roberts, Ralph Jackson

Geology and Mineral Deposits of the Carlile Quadrangle, Crook County, Wyoming

Description: From introduction: Geologic mapping of the Carlile quadrangle, which includes one of several uranium-producing areas in northeastern Wyoming, was undertaken to provide a detailed geologic map that could be used as an aid to further exploration for uranium deposits; to study in detail the known uranium deposits to determine whether or not there are any relations among structure, stratigraphy, lithology, and uranium deposits; and to outline, insofar as possible, areas favorable for more detailed exploration for uranium.
Date: 1961
Creator: Bergendahl, M. H.; Davis, Robert E. & Izett, Glen Arthur

Geology and Mineral Deposits of the St. Regis-Superior Area, Mineral County, Montana

Description: From introduction: The St. Regis-Superior area was studied during the summers of 1953 and 1954 as a part of geologic investigations by the U.S. Geologic Survey in and near the Coeur d'Alene district. The object of the present work was primarily threefold: to ascertain the main structural features in the area, with particular attention to the Osburn fault zone; to investigate the mineral deposits; and to determine the stratigraphic relations of the rocks.
Date: 1960
Creator: Campbell, Arthur Byron

Ordovician Graptolites of the Basin Ranges in California, Nevada, Utah, and Idaho

Description: From introduction: This report presents a summary of the graptolite faunas of the Basin Ranges as known from the collections of the U.S. Geological Survey and the Departments of Geology of the University of California at Los Angeles and Utah State University. The collections were made in the period 1872-1958, but only a very small number of specimens have been described or illustrated in the 80 or so years elapsed.
Date: 1963
Creator: Ross, Reuben James, Jr. & Berry, William B. N.