Emeritus
Email:
ellefsen@usgs.gov
Office Phone:
303-236-7032
ORCID:
0000-0003-3075-4703
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The product data are six statistics that were estimated for the chemical concentration of cobalt in the soil C horizon of the conterminous United States (Smith and others, 2013). The estimates are made at 9998 locations that are uniformly distributed across the conterminous United States. The six statistics are the mean for the isometric log-ratio transform of the concentrations, the equivalent mean for the concentrations, the standard deviation for the isometric log-ratio transform of the concentrations, the probability of exceeding a concentration of 24.4 milligrams per kilogram, the 0.95 quantile for the isometric log-ratio transform of the concentrations, and the equivalent 0.95 quantile for the concentrations....
Categories: Data;
Tags: GGGSC,
Geochemistry,
Geology, Geophysics, and Geochemistry Science Center,
MRP,
Mineral Resource Program, All tags...
Mineral Resources,
U.S. Geological Survey,
USGS,
USGS Science Data Catalog (SDC),
United States,
cobalt,
geochemistry,
kriging,
soil chemistry, Fewer tags
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Data on gold deposits are extracted from an existing publication to enable analysis. The data comprise selected portions of a data set that are published by C.J. Hodgson in "Preliminary Report on the Timmins-Kirkland Lake Area Gold Deposits File," which is available online as a digital image of a report. As an image, the data set cannot be analyzed. Consequently, selected portions of the data set are re-published here in a text file. The datum for the latitude and longitude is not specified in the report and is assumed to be the North American Datum of 1927 (NAD27). The Ontario Geological Survey, Ministry of Northern Development and Mines, Ontario, Canada kindly granted permission to re-publish these data. Hodgson,...
Categories: Data;
Types: Citation,
Map Service,
OGC WFS Layer,
OGC WMS Layer,
OGC WMS Service;
Tags: Abitibi Greenstone Belt,
Canada,
Englehart,
Kirkland Lake,
Lake Abitibi, All tags...
MRP,
Mineral Resource Program,
Ontario,
Timmins,
USGS Science Data Catalog (SDC),
economy,
geoscientificInformation,
gold,
mineral deposits, Fewer tags
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This data release includes estimates of potassium (K), equivalent uranium (eU), and equivalent thorium (eTh) for the conterminous United States derived from the U.S. Geological Survey's national airborne radiometric data compilation (Duval and others, 2005). Airborne gamma ray spectrometry (AGRS) measures the gamma-rays that are emitted from naturally occurring radioactive isotopes found in rocks and soil, the most abundant of which are potassium (K40), uranium (U238), and thorium (Th232). Radiometric data can aid in exploration of critical mineral resources, including deposits of barium, fluorine, titanium, beryllium, niobium, rare-earth elements, and uranium. There is also growing interest in using radiometric...
Categories: Data;
Types: Downloadable,
GeoTIFF,
Map Service,
Raster;
Tags: Alabama,
Arizona,
Arkansas,
California,
Colorado, All tags...
Connecticut,
Delaware,
District of Columbia,
Florida,
GGGSC,
Geochemistry,
Geology, Geophysics, and Geochemistry Science Center,
Geophysics,
Georgia,
Idaho,
Illinois,
Indiana,
Iowa,
Kansas,
Kentucky,
Louisiana,
MRP,
Maine,
Maryland,
Massachusetts,
Michigan,
Mineral Resources,
Mineral Resources Program,
Minnesota,
Mississippi,
Missouri,
Montana,
Nebraska,
Nevada,
New Hampshire,
New Jersey,
New Mexico,
New York,
North Carolina,
North Dakota,
Ohio,
Oklahoma,
Oregon,
Pennsylvania,
Puerto Rico,
Rhode Island,
Soil Sciences,
South Carolina,
South Dakota,
Tennessee,
Texas,
USGS Science Data Catalog (SDC),
United States,
Utah,
Vermont,
Virginia,
Washington,
West Virginia,
Wisconsin,
Wyoming,
aeroradiometric surveying,
economy,
geophysical maps,
geoscientificInformation,
mineral resources,
potassium,
soil chemistry,
thorium,
uranium, Fewer tags
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The product data are six statistics that were estimated for the chemical concentration of lithium in the soil C horizon of the conterminous United States. The estimates are made at 9998 locations that are uniformly distributed across the conterminous United States. The six statistics are the mean for the isometric log-ratio transform of the concentrations, the equivalent mean for the concentrations, the standard deviation for the isometric log-ratio transform of the concentrations, the probability of exceeding a concentration of 55 milligrams per kilogram, the 0.95 quantile for the isometric log-ratio transform of the concentrations, and the equivalent 0.95 quantile for the concentrations. Each statistic may be...
Categories: Data;
Tags: GGGSC,
Geochemistry,
Geology, Geophysics, and Geochemistry Science Center,
MRP,
Mineral Resources, All tags...
Mineral Resources Program,
U.S. Geological Survey,
USGS,
USGS Science Data Catalog (SDC),
United States,
geochemistry,
kriging,
lithium,
soil chemistry, Fewer tags
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Fibrous erionite, a zeolite mineral, has been designated as a human carcinogen by the World Health Organization and is believed to be the cause of extraordinarily high rates of malignant mesothelioma and other asbestos - related diseases in several villages in Central Turkey. A recent study by the University of Hawaii in collaboration with the U. S. Environmental Protection Agency in Dunn County, North Dakota has demonstrated similar human exposures to fibrous erionite as those in found in Turkey. The source of these exposures is an erionite - bearing volcanic tuff that has been mined, crushed, and used to gravel hundreds of miles of roads. While elevated rates of mesothelioma are not yet apparent in North Dakota,...
Categories: Data,
Project;
Types: Downloadable,
GeoTIFF,
Map Service,
Raster;
Tags: All Working Groups,
Completed,
Ecosystems,
Energy and Minerals,
Human Health, All tags...
erionite, Fewer tags
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