Eastern Mineral and Environmental Resources Science Center
Mineral Surveys and Analyses, Eastern US
- Geology - Compiled digital, state-scale, geologic
maps for the eastern US, and in support of topical studies, such as:
- Northern Michigan and Wisconsin- for analysis of the tectonic setting
of the Marquette Range Supergroup, in order to better delineate potential
tracts for undiscovered mineral deposits.
- Atlantic and Gulf Coastal Plain Province - for analysis of the distribution
known industrial mineral resources, in order to more accurately determine
the resource potential in the region.
- Geochemistry - The National Geochemical Survey
project developed a consistent national geochemical database of
stream-sediment samples, and some soils where appropriate, across
the United States; data is available online at web site http://tin.er.usgs.gov/geochem/Each sample has been analyzed for 42 elements including mercury, arsenic,
and selenium. This database is distributed within a grid with a cell size
of 17 X 17 km. All samples are analyzed using the same techniques by the same
lab, so the data can be analyzed and interpreted on a regional and national
basis. The resulting data is being used to
- produce geochemical maps;
- determine background values for selected elements;
- aid investigations of environmental and human health issues; and
Contact: Andrew Grosz
- forecast the nature and distribution of mineral resources.
Geophysics - Terrestrial Radioactivity and
Gamma-ray Exposure in the United States and Canada,
U.S. Geological Survey Open-File Report 2005-1413,
by Joseph S. Duval, John M. Carson, Peter B. Holman, and Arthur G. Darnley.
gravity data for southern Wisconsin. See website http://pubs.usgs.gov/of/2002/of02-493/
- These data, with the newly acquired aeromagnetic data for the same region,
were used to revise the geologic interpretation of the basement structures
in this area. The structures may affect the distribution of mineralization
and trace elements as well as groundwater flow.
- Mineral Deposit Database - We updated records
in the MRDS
for the eastern region of the U.S., especially the records of
significant mineral deposits, such as those identified in
Open-File Report 98-206, Database of Significant Deposits of Gold, Silver,
Copper, Lead, and Zinc in the United States.
We also used published
deposit model summaries:USGS
Bulletin 1693 and USGS
Bulletin 2004 to assign correct deposit model types to each record, facilitating
recognition of likely areas of undiscovered deposits.
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