Identification_Information:
Citation:
Citation_Information:
Originator: Douglas B. Yager
Originator: Helen W. Folger
Publication_Date: 2003
Title:
Maps of scandium, iron, cobalt, nickel, copper, zinc, arsenic, selenium, silver,
antimony, cerium, gold, and lead concentrations from stream sediments
and soils throughout the Humboldt River basin, and surrounding areas,
northern Nevada
Edition: 1.0
Geospatial_Data_Presentation_Form: map
Series_Information:
Series_Name: U.S. Geological Survey Miscellaneous Field Studies Map
Issue_Identification: MF-2407-A-M
Publication_Information:
Publication_Place: Denver, Colorado
Publisher: U.S. Geological Survey
Online_Linkage:
http://pubs.cr.usgs.gov/mf/2003/mf-2407/
Description:
Abstract:
This product consists of a GIS database and separate Adobe Acrobat .PDF format documents for 13
geochemical maps for the Humboldt River basin and surrounding areas,
northern Nevada. These maps are based on geochemical analyses of stream
sediment and soil samples that were collected as part of the National Uranium
Resource Evaluation (NURE) program and reanalyzed in 1994 (3,549 samples) as
part of the Winnemucca Surprise mineral resource assessment and in 1996
(3,712 samples) for the Humboldt River basin mineral and environmental assessment.
An additional 206 stream-sediment samples were collected by the U.S. Geological Survey
as part of the Winnemucca Surprise mineral resource assessment to fill in gaps in the
sample coverage. Sample density is generally spatially uniform and is about 17 square km.
All NURE samples were reanalyzed to be analytically consistent with other samples in the
study area. Statistics were used to determine the log transformed values for
each element, and from these values, the standard deviation ranges of between 1 to 3,
above and below the mean were used to thematically represent data on each map. The warm
hues of red, yellow, and orange represent concentrations above the mean and the cool hues
of purple, green, and blue represent concentrations below the mean. An image of a small scale
geochemical grid, which is based on the minimum tension gridding algorithm is included on each
map except for cobalt. Cobalt does not include a small scale geochemical grid image because
the data were not amenable to gridding as a continuous surface. Coverages for the 13 elements are
included as ArcInfo shapefiles.
Purpose:
These maps were constructed in cooperation with the U.S. Bureau of Land Management, Reno,
Nevada office. The U.S. Geological Survey along with the Bureau of Land Management
identified scandium, iron, cobalt, nickel, copper, zinc, arsenic, selenium, silver,
antimony, cerium, gold, and lead as elements of interest within the Humboldt River basin
either for their economic or environmental importance. When these data are combined with
other geologic datasets such as geologic formation type and or faults, the maps aid in identifying
regions of interest related to mineral exploration and associated environmental issues. Also, when
these data are combined with regional land ownership, county boundary, and or hydrologic unit
boundary coverages among many other coverages, these data may aid in prioritizing land use
decisions by Federal Land Managers.
Supplemental_Information:
This product consists of 16 vector point coverages. The 16 coverages comprise those of the 13
geochemical element thematic maps-- three of the maps are comprised of two shapefiles each.
Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 2003
Currentness_Reference: Publication date
Status:
Progress: Complete
Maintenance_and_Update_Frequency: None planned
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -120.0000
East_Bounding_Coordinate: -114.5000
North_Bounding_Coordinate: 42.0000
South_Bounding_Coordinate: 38.5000
Keywords:
Theme:
Theme_Keyword_Thesaurus: none
Theme_Keyword: Humboldt River basin mineral and environmental assessment
Theme_Keyword: U.S. Geological Survey Minerals Team
Theme_Keyword: Geochemical survey element maps
Theme_Keyword: Mineral exploration
Theme_Keyword: National Uranium Resource Evaluation (NURE) maps
Theme_Keyword: Elements in Nevada stream sediments and soils
Theme_Keyword: Bureau of Land Management, Nevada
Theme_Keyword: Quaternary geochemistry
Place:
Place_Keyword_Thesaurus: U.S. Board on Geographic Names (BGN) Geographic Names Information System (GNIS)
Place_Keyword: Humboldt River basin
Place_Keyword: northern Nevada
Place_Keyword: Basin and Range Physiographic Province
Place_Keyword: Great Basin
Access_Constraints: None
Use_Constraints:
The intended scale of use for this data is 1:500,000. Acknowledgment of
the U.S. Geological Survey would be appreciated in products derived from
these data.
Point_of_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Douglas B. Yager
Contact_Organization: U.S. Geological Survey
Contact_Address:
Address_Type: mailing address
Address: U.S. Geological Survey, MS 973, PO Box 25046, Denver Federal Center
City: Denver
State_or_Province: Colorado
Postal_Code: 80225
Country: USA
Contact_Voice_Telephone: (303)236-2487
Contact_Electronic_Mail_Address: dyager@usgs.gov
Browse_Graphic:
Browse_Graphic_File_Name:
Browse_Graphic_File_Description: Graphic representations of map layouts. There are 13 separate browse graphic files, one for each element. The previous URL links to the web page for this publication; on the web page there are 13 separate links for the browse graphic files.
Browse_Graphic_File_Type: PDF
Data_Set_Credit: Douglas B. Yager and Helen W. Folger created the ArcInfo coverages from an existing database that was
initially published by Folger and Ludington (2000).
Native_Data_Set_Environment: ArcInfo 7.2.1, Sun Unix platform
Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report:
Estimated to meet National Map Accuracy Standards for a 1:500,000 scale map (approximately
plus or minus 250 meters). Data suitable for regional to local scale analysis.
Logical_Consistency_Report:
Not applicable.
Completeness_Report:
Not applicable.
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report:
The estimated horizontal positional accuracy of the data is plus or minus 250 meters.
Lineage:
Process_Step:
Process_Description:
The log transformed values for each element concentration were determined and
the mean and standard deviations were subsequently calculated. The point data that represent
the standard deviation ranges above and below the mean were query selected from ArcInfo coverages and
were converted to ArcShape files and subsequently imported into Adobe Illustrator via the
Map Publisher software plugin. A thematic map for each element was generated by symbolizing the
multiple standard deviation data ranges in increments between 1 and 3 above and below the mean.
The Lower limit of detection (LLD) for scandium is 2 ppm for the Winnemucca Surprise (Ws) and 1 ppm for the
Humboldt River basin (HRB). Scandium values less than the LLD were substituted with values equal to
1.0 ppm for the WS data set. There were no substitutions in the scandium HRB dataset. The LLD for iron is 0.01%
WS and 0.01% HRB. There are no iron values less than the LLD in the WS or HRB datasets. The LLD for cobalt is 1.0
ppm WS and 2.0 ppm HRB. Cobalt values less than the LLD were substituted with values equal to 1.4 ppm for the HRB
data set. The LLD for nickel is 2 ppm WS and 2 ppm HRB. Values less than the LLD were substituted with values
equal to 1.0 ppm for the WS data set. There were no substitutions in the nickel HRB dataset. The LLD for Copper is
1.0 ppm WS and 2.0 ppm HRB. Copper Values less than LLD were substituted with values equal to 1.0 ppm for HRB data
set. There were no substitutions in the copper WS data set. The LLD for Zinc is 0.05 ppm WS and 1 ppm HRB. Zinc
values less than the LLD were substituted with values equal to 0.025 ppm for WS data set. The LLD for arsenic is
0.67 ppm WS and 1 ppm HRB. Arsenic values less than the LLD were substituted with values equal to 0.325 ppm for
WS and 0.65 ppm for HRB data sets.The LLD for selenium is 0.2 ppm (HAAS) and 0.0002 ppm (ICP-AES). Selenium values
less than the LLD were substituted with values equal to 0.0001 ppm for HAAS and ICP-AES data. The LLD for silver
is 0.067 ppm (WS) and 0.015 ppm (HRB). Silver values less than the LLD were substituted with values equal to 0.5
ppm for the WS and 0.008 ppm for the HRB data sets. The LLD for antimony is 0.67 ppm (WS) and 0.95 ppm (HRB).
Antimony values less than the LLD were substituted with values equal to 0.0475 ppm for WS data set. The LLD for
cerium is 4.0 ppm (WS) and 1.0 ppm (HRB). There were no cerium values less than the lower limit-of-detection
(LLD) in either data set. The LLD for gold is 0.002 ppm (WS) and 0.0005 ppm (HRB). Gold values less than the LLD
were substituted with values equal to 0.0001 ppm for the WS data set and 0.00005 ppm for the HRB data set. The LLD
for lead is 1 ppm (WS) and 0.25 ppm (HRB). Lead values less than the LLD were substituted with values equal to
0.55 ppm for WS data set. There were no substitutions in the lead HRB data set. Analytical methods used are as
follows: Scandium- Total digestion of sample followed by analysis by Inductively Coupled Plasma- Atomic Emission
Spectrometry (ICP-AES) (Briggs, 1996), iron- Total digestion of sample followed by analysis by Inductively Coupled
Plasma- Atomic Emission Spectrometry (ICP-AES)(Briggs, 1996), cobalt- Total digestion of sample followed by
analysis by Inductively Coupled Plasma- Atomic Emission Spectrometry (ICP-AES) (Briggs, 1996), nickel- Total
digestion of sample followed by analysis by Inductively Coupled Plasma- Atomic Emission Spectrometry (ICP-AES)
(Briggs, 1996), copper- Total digestion of sample followed by analysis by Inductively Coupled Plasma- Atomic
Emission Spectrometry (ICP-AES) (Briggs, 1996), zinc- Partial digestion of sample followed by analysis by
Inductively Coupled Plasma- Atomic Emission Spectrometry (ICP-AES) (Motooka, 1996), arsenic- Partial digestion of
sample followed by analysis by Inductively Coupled Plasma- Atomic Emission Spectrometry (ICP-AES) (Motooka, 1996),
selenium- Samples from the eastern half of the HRB were analyzed by a contract laboratory for the USGS using a
partial digestion followed by analysis by Inductively Coupled Plasma- Atomic Emission Spectrometry (ICP-AES)
(method similar to Motooka, 1996). Samples from the western half of the HRB were analyzed by hydride-generation-
atomic adsorption spectrophotometry (HAAS) (Hageman and Welsch, 1996), silver- Partial digestion of sample
followed by analysis by Inductively Coupled Plasma- Atomic Emission Spectrometry(ICP-AES) (Motooka, 1996),
antimony- Partial digestion of sample followed by analysis by Inductively Coupled Plasma- Atomic Emission
Spectrometry (ICP-AES) (Motooka, 1996), cerium- Total digestion of sample followed by analysis by Inductively
Coupled Plasma- Atomic Emission Spectrometry (ICP-AES) (Briggs, 1996), gold- Gold was analyzed by graphite-
furnace atomic adsorption spectrophotometry (FAAS) (O’Leary and Meier, 1996), lead- Partial digestion of sample
followed by analysis by Inductively Coupled Plasma- Atomic Emission Spectrometry (ICP-AES)(Motooka, 1996).
Process_Date: 1996 to 2002
Process_Step:
Process_Description:
Shape files were imported into ArcInfo and query selects were made for each of the data ranges portrayed on
each map. Data for each data range were placed in separate coverages and were subsequently imported into
Adobe Illustrator using the Map Publisher software plugin.
Process_Date: 1998 to 2002
Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method: Vector
Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Planar:
Map_projection:
Map_projection_Name: Lambert_Conformal_Conic
Lambert_Conformal_Conic:
Standard_Parallel: 33.00
Standard_Parallel: 45.00
Longitude_of_Central_Meridian: -117.00
Latitude_of_Projection_Origin: 0
False_Easting: 0
False_Northing: 0
Planar_Coordinate_Information:
Planar_Coordinate_Encoding_Method: coordinate pair
Coordinate_Representation:
Abscissa_Resolution: 1.0
Ordinate_Resolution: 1.0
Planar_Distance_Units: Meters
Geodetic_Model:
Horizontal_Datum_Name: North American Datum of 1927
Ellipsoid_Name: Clarke 1866
Semi-major_Axis: 6370997
Denominator_of_Flattening_Ratio: 294.98
Entity_and_Attribute_Information:
Overview_Description:
Entity_and_Attribute_Overview:
DATABASE STRUCTURE--This USGS MF map series consists of 17 coverages. The coverage "wsbnd" consists of a single
polygon coverage and represents the Humboldt River watershed boundary. There are 16 addtional coverages.
The three elements scandium, colbalt, and silver are comprised of two separate datasets each;
one each for the Winnemucca Surprise and Humboldt River basin datasets. All other elements
consist of one coverage for the combined Winnemucca Surprise and Humboldt River basin datasets. Other than
the standard point coverage attributes, the attribute items for the datasets are as follows. Note that the
Winnemucca Surprise shape files have a "WS_element symbol" prefix, the Humboldt River basin datasets have a
"hrb_element symbol" and the combined datasets have a "log_element symbol"
prefix.
LAB_NO
NURE_ID
PRIME_ID
SECND_ID
LAT
LONG
TYPE
JOB_NO
Element symbol_PPM_S or Element symbol_P_PPM or P_Element symbol_PPM or U_Element symbol_PPM or G_Element symbol_PPM
or T_Element symbol_PPM or U_Element symbol_PPM or T_FE_PCT or A_Element symbol_PPM or LOG_Element symbol_PP or
LOG_Element symbol_W or LOG_Element symbol_PPM or LOG_Element symbol_HR or LOG_FE_PCT. The following overview
discusses all of the non-common attributes included in the geochemical point coverages.
LAB_NO = External Laboratory number used by outside U.S. Geological Survey Lab
NURE_ID = National uranium resource evaluation reference number
PRIME_ID = Equivalent to NURE_ID above
SECND_ID = U.S. Geological Survey equivalent laboratory reference number that is cross referenced with a previous analytical job number
LAT = Latitude in decimal degrees
LONG = Longitude in decimal degrees
TYPE = Sample media type, only reported when available and coded as follows: 50 Stream sediment -100 mesh, 59 Soil -100 mesh, 61 Stream sediment -100 mesh, 101 USGS collected stream sediment -80 mesh, 102 USGS prepared stream sediment -80 mesh
JOB_NO = U.S. Geological Survey Job number
Element symbol_PPM_* = The concentration of an element measured in parts-per-million (ppm). Note that iron is reported in percent.
LOG_Element symbol_* = The logarithmic value (in parts per million) of the element concentration value. Note that iron is reported in percent.
Entity_and_Attribute_Detail_Citation: none
Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey
Contact_Address:
Address_Type: mailing address
Address: Central Publications Group
Address: MS 902, Box 25046
Address: Denver Federal Center
City: Denver
State_or_Province: Colorado
Postal_Code: 80225
Country: USA
Contact_Voice_Telephone: (888)ASK-USGS
Contact_Electronic_Mail_Address: webmaster@geology.cr.usgs.gov
Distribution_Liability:
The U.S. Geological Survey (USGS) provides these geographic data "as is".
The USGS makes no guarantee or warranty concerning the accuracy of
information contained in the geographic data. The USGS further makes no
warranties, either expressed or implied, as to any other matter whatsoever,
including, without limitation, the condition of the product, or its fitness
for any particular purpose. The burden for determining fitness for use lies
entirely with the user. Although these data have been processed
successfully on computers at the USGS, no warranty, expressed or implied,
is made by the USGS regarding the use of these data on any other system, nor
does the fact of distribution constitute or imply any such warranty.
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Format_Name: ARC/INFO shapefile format
Format_Version_Number: ArcInfo version 7.2.1
File_Decompression_Technique:
.tar.gz - UNIX gzip-compressed TAR file - use GNU zip and TAR to extract
.ZIP - Windows ZIP archive - use Winzip, PKZip, or similar to extract
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name:
Fees: None
Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S.Geological Survey
Contact_Address:
Address_Type: mailing address
Address: USGS Information Services
Address: Box 25286
City: Denver
State_or_Province: CO
Postal_Code: 80225
Country: United States
Contact_Voice_Telephone: 1-888-ASK-USGS
Resource_Description: MF-2407 (Map-on-Demand)
Distribution_Liability: none
Standard_Order_Process:
Non-digital_Form:
Available as one printed sheet. Order from USGS at the address listed
above or see http://rmmcweb.cr.usgs.gov/public/mod/order.html for more ordering
information.
Fees:
for current prices please see
http://rmmcweb.cr.usgs.gov/public/mod/order.html
Metadata_Reference_Information:
Metadata_Date: 20030211
Metadata_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Douglas B. Yager
Contact_Organization: U.S. Geological Survey
Contact_Address:
Address_Type: mailing address
Address: Box 25046
Address: Denver Federal Center, MS-973
City: Denver
State_or_Province: Colorado
Postal_Code: 80225
Country: USA
Contact_Voice_Telephone: (303) 236-2487
Contact_Electronic_Mail_Address: dyager@usgs.gov
Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998
Metadata_Access_Constraints: None
Metadata_Use_Constraints: None