Filters: Tags: Miscellaneous Field Studies Map (X)3,322 results (12.7s)
Map showing anomalous tungsten and gold distribution in stream sediment concentrates, Hillsboro and San Lorenzo quadrangles exclusive of the Black Range Primitive Area, Sierra and Grant Counties, New Mexico
This map shows the distribution of anomalous tungsten in the two sample fractions, magnetic (M-1) and nonmagnetic (NM-1) gold in the nonmagnetic (NM-1) fraction; these are plotted on a base which includes sample localities, topography, and generalized geology modified from Hedlund (1975a, b). It is part of a series of maps for several metals that accompany this folio. Distributions of the tungsten and gold values are shown on the accompanying histograms.
Preliminary geologic map of the northeast part of the Burdock quadrangle, Fall River and Custer Counties, South Dakota
No abstract available.
The Cuyuna iron-ore district is in central Minnesota in Morrison, Crow Wing, and Aitkin Counties. The length of the district is about 68 miles, extending from near Randall in Morrison County ot a point 11 miles east of the community of Hassmann in Aitkin County, and the maximum know width is about 25 miles near the center of the district. Current mining activity is confined to a much smaller area about 10 miles longs and 3 miles wide near Crosby and Ironton in Crow Wing County. This investigation has been restricted to the active area plus a marginal strip in which much exploratory drilling has been done. The average annual production of iron ore and manganiferous iron ore from the district during 1940-50 was...
Reconnaissance geologic map of the Sliderock Mountain area, Sweet Grass and Stillwater counties, Montana
The remains of a deeply eroded Late Cretaceous stratovolcano centered near Sliderock Mountain dominate the map area. The volcano consists mostly of lahars, although basaltic andesite lava flows are also present. An extensively eroded, weakly mineralized hypabyssal intrusive complex, inferred to represent the volcano's solidified magma chamber, intrudes previously erupted lava flows and associated lahars. Cretaceous sandstone and shale and Paleozoic sedimentary rocks, principally limestone of the Madison Group, host the stratovolcano; remnants of these rocks are preserved as large xenoliths and roof pendants.
Mineral resource assessment of pegmatite minerals in the Greenville 1 degree by 2 degrees Quadrangle, South Carolina, Georgia, and North Carolina
Mineral resources of the Greenville 1° x 2° quadrangle, South Carolina, Georgia, and North Carolina, were assessed between 1984 and 1990 under the Conterminuous United States Mineral Assessment Program (CUSMAP) of the U.S. Geological Survey (USGS). The mineral resource assessments were made on the basis of geologic, geochemical, and geophysical investigations and on the distribution of mines, prospects, and mineral occurrences reported in the literature. This report is an assessment of the minerals associated with mica pegmatites in the Greenville quadrangle. It is based on the geology as mapped by Nelson and others (1989), on field studies conducted from 1952 to 1962 by the USGS for the Defense Minerals Exploration...
Mineralogical maps showing distribution of selected ore-related minerals in the nonmagnetic, heavy-mineral-concentrate fraction of stream sediment from the Mount Hayes 1 degree by 3 degrees Quadrangle, eastern Alaska Range, Alaska
Exploratory geochemical sampling was done in 1979, 1980, and 1981. The collection of composite samples of stream sediment or glacial debris was emphasized the first 2 years; the last year was spent collecting mineralized stream pebbles, float, and outcrop samples. The stream-sediment and heavy- mineral-concentrate samples were collected at 795 sites on tributary streams having drainage basins ranging from 1 to 5 mi 2 in area. The glacial debris samples were collected at 116 sites on tributary glaciers also having drainage basins ranging from 1 to 5 mi2 in area. All of these samples were analyzed for 31 elements by six-step semiquantitative emission spectrography (Grimes and Marranzino, 1968). In addition, all samples...
Map showing metallic mineral resource potential in the Goodnews Bay, Hagemeister Island, and Nushagak Bay 1 degree by 3 degrees quadrangles, southeast Alaska
Preliminary geologic map of the east-central part of the Minnekahta quadrangle, Fall River County, South Dakota
No abstract available.
Measured sections of Ramsey Ranch Member of Wasatch Formation, greater Green River basin, southwestern Wyoming
The Colorado Palteau Uranium Province (CPUP) is defined by the distribution of uranium deposits, chiefly the sandstone-type, in upper Paleozoic and Mesozoic sedimentary rocks within the Colorado Plateau physiographic province (Granger and others, 1986). The uranium province is bordered by widely distributed and mostly minor uranium deposits in Precambrian and Tertiary rocks and by outcrops of Tertiary extrusive and intrusive igneous rocks.
Map showing distribution of lead in stream-sediment samples, Richfield 1 degree by 2 degrees Quadrangle, Utah
This map of the Richfield 1° x 2° quadrangle, Utah, shows the regional distribution of lead in the less-than-0.180-mm (minus-80-mesh) fraction of stream sediments. It is part of a folio of maps of the Richfield 1° x 2° quadrangle, Utah, prepared under the Conterminuous United States Mineral Assessment Program. Other published geochemical maps in this folio are listed in the references (this publication). The Richfield quadrangle is located in west-central Utah and includes the eastern part of the Pioche-Marysvale igneous and mineral belt, which extends from the vicinity of Pioche in southeastern Nevada, east-northeastward for 155 miles into central Utah. The western two-thirds of the Richfield quadrangle is part...
Map showing distribution of gold in stream-sediment samples, Richfield 1 degree by 2 degrees Quadrangle, Utah
This map of the Richfield 1° x 2° quadrangle, Utah, shows the regional distribution of gold in the less-than-0.180-mm (minus-80-mesh) fraction of stream sediments. It is part of a folio of maps of the Richfield 1° x 2° quadrangle, Utah, prepared under the Conterminuous United States Mineral Assessment Program. Other published geochemical maps in this folio are listed in the Selected References of this report. The Richfield quadrangle is located in west-central Utah and includes the eastern part of the Pioche-Marysvale igneous and mineral belt, which extends from the vicinity of Pioche in southeastern Nevada, east-northeastward for 155 miles into central Utah. The western two-thirds of the Richfield quadrangle is...
Maps and preliminary interpretation of anomalous rock geochemical data from the Petersburg quadrangle and parts of Port Alexander, Sitka, and Sumdum quadrangles, southeastern Alaska
Correlation chart of lower and upper Cretaceous Blackleaf Formation, Lima Peaks area to eastern Pioneer Mountains, southwestern Montana
Geochemistry and mineralogy of heavy-mineral concentrates from the Killik River 1 degree by 3 degrees quadrangle, Alaska
Photogeologic map and reconnaissance geologic map of the Rosebud and Thrulow quadrangles, Rosebud County, Montana
Geochemical map showing distribution and abundance of copper in silicified rocks, Goldfield mining district, Esmeralda and Nye counties, Nevada
No abstract available.