Alaska merged geophysical data grids

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Frequently anticipated questions:


What does this data set describe?

Title: Alaska merged geophysical data grids
Abstract:
Merged grids of residual magnetic intensity and apparent resistivity compiled from the Wrangellia, Iron Creek, Southern Delta River, Valdez Creek, and Nikolai geophysical surveys.
Supplemental_Information:
wran_ic_sdr_vc_nik: Geosoft format gridded data, ER Mapper format gridded data, ESRI ArcGIS shapefile, and keyhole markup language (.kml) data archive files. Note: these data are provided in both UTM Zone 6 - NAD27 and Geographic WGS84 projections. The data files were compiled from the Wrangellia, Iron Creek, Southern Delta River, Valdez Creek, and Nikolai geophysical surveys.
  1. How should this data set be cited?

    Staff, DGGS, 2016, Alaska merged geophysical data grids: Digital Data Series DDS 12, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

    Online Links:

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -149.710159
    East_Bounding_Coordinate: -145.242354
    North_Bounding_Coordinate: 63.378523
    South_Bounding_Coordinate: 62.245097

  3. What does it look like?

  4. Does the data set describe conditions during a particular time period?

    Beginning_Date: 1993
    Ending_Date: 2013
    Currentness_Reference: ground condition

  5. What is the general form of this data set?

    Geospatial_Data_Presentation_Form: digital data

  6. How does the data set represent geographic features?

    1. How are geographic features stored in the data set?

      This is a raster data set.

    2. What coordinate system is used to represent geographic features?

      Grid_Coordinate_System_Name: Universal Transverse Mercator
      Universal_Transverse_Mercator:
      UTM_Zone_Number: 6
      Transverse_Mercator:
      Scale_Factor_at_Central_Meridian: 0.999600
      Longitude_of_Central_Meridian: -147
      Latitude_of_Projection_Origin: 0
      False_Easting: 500000.000000
      False_Northing: 0

      Planar coordinates are encoded using coordinate pair
      Abscissae (x-coordinates) are specified to the nearest .00000001
      Ordinates (y-coordinates) are specified to the nearest .00000001
      Planar coordinates are specified in Meters

      The horizontal datum used is North American Datum of 1927.
      The ellipsoid used is Clarke 1866.
      The semi-major axis of the ellipsoid used is 6378206.40000000037.
      The flattening of the ellipsoid used is 1/294.978698199999997.

  7. How does the data set describe geographic features?

    wran_ic_sdr_vc_nik
    Geosoft format gridded data, ER Mapper format gridded data, ESRI ArcGIS shapefile, and keyhole markup language (.kml) data archive files. Note: these data are provided in both UTM Zone 6 - NAD27 and Geographic WGS84 projections. The data files were compiled from the Wrangellia, Iron Creek, Southern Delta River, Valdez Creek, and Nikolai geophysical surveys. (Source: Alaska Division of Geological & Geophysical Surveys (DGGS) and contractor.)


Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)

  2. Who also contributed to the data set?

    Funding for the originating geophysical surveys was provided by the Alaska Division of Geological & Geophysical Surveys' (DGGS) Airborne Geophysical/Geological Mineral Inventory (AGGMI) program and the Alaska Strategic and Critical Minerals Assessment Capital Improvement Project. The geophysical surveys were managed by State of Alaska, Department of Natural Resources (DNR), Division of Geological & Geophysical Surveys (DGGS). These Merged grids were generated as part of the Wrangellia data collection contract. The survey data were collected, processed, and/or compiled by Barefoot, John D., Burns, Laurel E., CGG, Clautice, K. H., Dighem Surveys and Processing,Emond, Abraham M., Fugro Airborne Surveys Corp., Fugro GeoServices, Inc., Geoterrex-Dighem, Graham, G. R. C., Liss, S. A., McConnell, Douglas L., Naibert, Travis J., Pritchard, R. A., Stevens Exploration Management Corp., U.S. Bureau of Land Management, WGM Mining and Geological Consultants, Inc., and Woods, Rebecca-Ellen

  3. To whom should users address questions about the data?

    Alaska Division of Geological & Geophysical Surveys
    Metadata Manager
    3354 College Road
    Fairbanks, AK 99709-3707
    USA

    (907)451-5020 (voice)
    (907)451-5050 (FAX)
    dggspubs@alaska.gov

    Hours_of_Service: 8 am to 4:30 pm, Monday through Friday, except State holidays


Why was the data set created?

This electromagnetic and magnetic airborne geophysical survey data compilation is a product of the Alaska Division of Geological & Geophysical Surveys' (DGGS) Airborne Geophysical/Geological Mineral Inventory (AGGMI) program and the Alaska Strategic and Critical Minerals Assessment Capital Improvement Project. The goal of the Alaska Division of Geological & Geophysical Surveys' (DGGS) Airborne Geophysical/Geological Mineral Inventory (AGGMI) program is to enhance the understanding of Alaska's mineral resources and stimulate private-sector mineral development. The program seeks to delineate mineral zones on Alaska State lands that: (1) have major economic value; (2) can be developed in the short term to provide high-quality jobs for Alaskans; and (3) will provide economic diversification to help offset the loss of Prudhoe Bay oil revenue. Candidate lands for this program are identified on the basis of existing geologic knowledge, land ownership, and nominations from Alaska's geologic community. The AGGMI program and resulting new geologic knowledge are recognized worldwide and have encouraged millions of dollars of venture capital expenditures in the local economies of the surveyed mining districts. These venture capital expenditures have led to discovery and delineation of new mineral resources. The multi-year Strategic and Critical Minerals Assessment Capital Improvement Project (SCMA) was established to determine Alaska's geologic potential for rare-earth elements and other minerals that are essential for our modern, technology-based society. This program began in FY2012 with a data survey and compilation of existing information on rare-earth-element occurrences in Alaska, and expanded significantly in FY2013 to include additional critical minerals, re-analyses of existing samples, and obtaining new field and analytical data, including airborne geophysics.


How was the data set created?

  1. From what previous works were the data drawn?

    Burns, L.E. and others, 2014 (source 1 of 46)
    Burns, L.E., Geoterrex-Dighem, WGM, Inc., Emond, A.M., and Graham, G.R.C., 2014, Iron Creek airborne electromagnetic and magnetic geophysical survey data compilation: Geophysical Report GPR 2014-6, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

    Online Links:

    Type_of_Source_Media: paper
    Source_Contribution: Data collection, processing, and delivery

    Burns, L.E. and Liss, S.A., 1998 (source 2 of 46)
    Burns, L.E., and Liss, S.A., 1998, Portfolio of aeromagnetic and resistivity maps of the Iron Creek area, Talkeetna Mountains Quadrangle, southcentral Alaska: Public Data File PDF 98-6, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

    Online Links:

    Other_Citation_Details: 16 p., 1 sheet
    Type_of_Source_Media: paper
    Source_Contribution: Data collection, processing, and delivery

    DGGS Staff and others, 1998 (source 3 of 46)
    Staff, DGGS, Geoterrex-Dighem, and WGM, Inc., 1998, 7200 Hz coplanar resistivity of the Iron Creek area, Talkeetna Mountains Quadrangle, southcentral Alaska: Public Data File PDF 98-5, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

    Online Links:

    Other_Citation_Details: 2 sheets, scale 1:63,360
    Type_of_Source_Media: paper
    Source_Scale_Denominator: 63360
    Source_Contribution: Data collection, processing, and delivery

    DGGS Staff and others, 1998 (source 4 of 46)
    Staff, DGGS, Geoterrex-Dighem, and WGM, Inc., 1998, 7200 Hz coplanar resistivity of the Iron Creek area, Talkeetna Mountains Quadrangle, southcentral Alaska: Report of Investigation RI 98-3, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

    Online Links:

    Other_Citation_Details: 2 sheets, scale 1:63,360
    Type_of_Source_Media: paper
    Source_Scale_Denominator: 63360
    Source_Contribution: Data collection, processing, and delivery

    DGGS Staff and others, 1998 (source 5 of 46)
    Staff, DGGS, Geoterrex-Dighem, and WGM, Inc., 1998, 900 Hz coplanar resistivity of the Iron Creek area, Talkeetna Mountains Quadrangle, southcentral Alaska: Public Data File PDF 98-4, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

    Online Links:

    Other_Citation_Details: 2 sheets, scale 1:63,360
    Type_of_Source_Media: paper
    Source_Scale_Denominator: 63360
    Source_Contribution: Data collection, processing, and delivery

    DGGS Staff and others, 1998 (source 6 of 46)
    Staff, DGGS, Geoterrex-Dighem, and WGM, Inc., 1998, 900 Hz coplanar resistivity of the Iron Creek area, Talkeetna Mountains Quadrangle, southcentral Alaska: Report of Investigation RI 98-2, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

    Online Links:

    Other_Citation_Details: 2 sheets, scale 1:63,360
    Type_of_Source_Media: paper
    Source_Scale_Denominator: 63360
    Source_Contribution: Data collection, processing, and delivery

    DGGS Staff and others, 1998 (source 7 of 46)
    Staff, DGGS, Geoterrex-Dighem, and WGM, Inc., 1998, CD-ROM containing gridded files and section lines of 1997 geophysical survey data for Iron Creek area, Talkeetna Mountains Quadrangle, southcentral Alaska: Public Data File PDF 98-8, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

    Online Links:

    Other_Citation_Details: 1 DVD
    Type_of_Source_Media: paper
    Source_Contribution: Data collection, processing, and delivery

    DGGS Staff and others, 1998 (source 8 of 46)
    Staff, DGGS, Geoterrex-Dighem, and WGM, Inc., 1998, CD-ROM containing profile and gridded data and section lines of the 1997 geophysical survey data for Iron Creek area, Talkeetna Mountains Quadrangle, southcentral Alaska: Public Data File PDF 98-9, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

    Online Links:

    Other_Citation_Details: 1 DVD
    Type_of_Source_Media: paper
    Source_Contribution: Data collection, processing, and delivery

    DGGS Staff and others, 1998 (source 9 of 46)
    Staff, DGGS, Geoterrex-Dighem, and WGM, Inc., 1998, Flight lines of the Iron Creek area, Talkeetna Mountains Quadrangle, southcentral Alaska: Public Data File PDF 98-1, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

    Online Links:

    Other_Citation_Details: 2 sheets, scale 1:63,360
    Type_of_Source_Media: paper
    Source_Scale_Denominator: 63360
    Source_Contribution: Data collection, processing, and delivery

    DGGS Staff and others, 1998 (source 10 of 46)
    Staff, DGGS, Geoterrex-Dighem, and WGM, Inc., 1998, Total field magnetics and detailed electromagnetic anomalies of the Iron Creek area, Talkeetna Mountains Quadrangle, southcentral Alaska (part of C-4): Public Data File PDF 98-18B, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

    Online Links:

    Other_Citation_Details: 1 sheet, scale 1:31,680
    Type_of_Source_Media: paper
    Source_Scale_Denominator: 31680
    Source_Contribution: Data collection, processing, and delivery

    DGGS Staff and others, 1998 (source 11 of 46)
    Staff, DGGS, Geoterrex-Dighem, and WGM, Inc., 1998, Total field magnetics and detailed electromagnetic anomalies of the Iron Creek area, Talkeetna Mountains Quadrangle, southcentral Alaska (part of C-5): Public Data File PDF 98-18A, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

    Online Links:

    Other_Citation_Details: 1 sheet, scale 1:31,680
    Type_of_Source_Media: paper
    Source_Scale_Denominator: 31680
    Source_Contribution: Data collection, processing, and delivery

    DGGS Staff and others, 1998 (source 12 of 46)
    Staff, DGGS, Geoterrex-Dighem, and WGM, Inc., 1998, Total field magnetics and detailed electromagnetic anomalies of the Iron Creek area, Talkeetna Mountains Quadrangle, southcentral Alaska (parts of C-3 and C-4): Public Data File PDF 98-18C, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

    Online Links:

    Other_Citation_Details: 1 sheet, scale 1:31,680
    Type_of_Source_Media: paper
    Source_Scale_Denominator: 31680
    Source_Contribution: Data collection, processing, and delivery

    DGGS Staff and others, 1998 (source 13 of 46)
    Staff, DGGS, Geoterrex-Dighem, and WGM, Inc., 1998, Total field magnetics and electromagnetic anomalies of the Iron Creek area, Talkeetna Mountains Quadrangle, southcentral Alaska (clear diazo film version): Public Data File PDF 98-2, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

    Online Links:

    Other_Citation_Details: 2 sheets, scale 1:63,360
    Type_of_Source_Media: paper
    Source_Scale_Denominator: 63360
    Source_Contribution: Data collection, processing, and delivery

    DGGS Staff and others, 1998 (source 14 of 46)
    Staff, DGGS, Geoterrex-Dighem, and WGM, Inc., 1998, Total field magnetics and electromagnetic anomalies of the Iron Creek area, Talkeetna Mountains Quadrangle, southcentral Alaska (part of B-3 and B-4): Public Data File PDF 98-18G, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

    Online Links:

    Other_Citation_Details: 1 sheet, scale 1:31,680
    Type_of_Source_Media: paper
    Source_Scale_Denominator: 31680
    Source_Contribution: Data collection, processing, and delivery

    DGGS Staff and others, 1998 (source 15 of 46)
    Staff, DGGS, Geoterrex-Dighem, and WGM, Inc., 1998, Total field magnetics and electromagnetic anomalies of the Iron Creek area, Talkeetna Mountains Quadrangle, southcentral Alaska (part of B-4): Public Data File PDF 98-18F, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

    Online Links:

    Other_Citation_Details: 1 sheet, scale 1:31,680
    Type_of_Source_Media: paper
    Source_Scale_Denominator: 31680
    Source_Contribution: Data collection, processing, and delivery

    DGGS Staff and others, 1998 (source 16 of 46)
    Staff, DGGS, Geoterrex-Dighem, and WGM, Inc., 1998, Total field magnetics and electromagnetic anomalies of the Iron Creek area, Talkeetna Mountains Quadrangle, southcentral Alaska (part of B-5 and B-6): Public Data File PDF 98-18D, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

    Online Links:

    Other_Citation_Details: 1 sheet, scale 1:31,680
    Type_of_Source_Media: paper
    Source_Scale_Denominator: 31680
    Source_Contribution: Data collection, processing, and delivery

    DGGS Staff and others, 1998 (source 17 of 46)
    Staff, DGGS, Geoterrex-Dighem, and WGM, Inc., 1998, Total field magnetics and electromagnetic anomalies of the Iron Creek area, Talkeetna Mountains Quadrangle, southcentral Alaska (part of B-5): Public Data File PDF 98-18E, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

    Online Links:

    Other_Citation_Details: 1 sheet, scale 1:31,680
    Type_of_Source_Media: paper
    Source_Scale_Denominator: 31680
    Source_Contribution: Data collection, processing, and delivery

    DGGS Staff and others, 1998 (source 18 of 46)
    Staff, DGGS, Geoterrex-Dighem, and WGM, Inc., 1998, Total field magnetics and electromagnetic anomalies of the Iron Creek area, Talkeetna Mountains Quadrangle, southcentral Alaska: Public Data File PDF 98-3, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

    Online Links:

    Other_Citation_Details: 2 sheets, scale 1:63,360
    Type_of_Source_Media: paper
    Source_Scale_Denominator: 63360
    Source_Contribution: Data collection, processing, and delivery

    DGGS Staff and others, 1998 (source 19 of 46)
    Staff, DGGS, Geoterrex-Dighem, and WGM, Inc., 1998, Total field magnetics of the Iron Creek area, Talkeetna Mountains Quadrangle, southcentral Alaska: Report of Investigation RI 98-1, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

    Online Links:

    Other_Citation_Details: 2 sheets, scale 1:63,360
    Type_of_Source_Media: paper
    Source_Scale_Denominator: 63360
    Source_Contribution: Data collection, processing, and delivery

    Pritchard, R.A. and Geoterrex-Dighem, 1998 (source 20 of 46)
    Pritchard, R.A., and Geoterrex-Dighem, 1998, Project report of the 1997 geophysical survey data for Iron Creek area, Talkeetna Mountains Quadrangle, southcentral Alaska: Public Data File PDF 98-7, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

    Online Links:

    Other_Citation_Details: 313 p., 2 sheets, scale 1:63,360
    Type_of_Source_Media: paper
    Source_Scale_Denominator: 63360
    Source_Contribution: Data collection, processing, and delivery

    Burns, L.E. and others, 2003 (source 21 of 46)
    Burns, L.E., U.S. Bureau of Land Management, Surveys, Fugro Airborne, and Stevens Exploration Management Corp., 2003, Line, grid, and vector data of airborne geophysical survey data for the southern Delta River area, east-central Alaska: Geophysical Report GPR 2003-6, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

    Online Links:

    Other_Citation_Details: 1 DVD
    Type_of_Source_Media: paper
    Source_Contribution: Data collection, processing, and delivery

    Burns, L.E. and others, 2003 (source 22 of 46)
    Burns, L.E., U.S. Bureau of Land Management, Surveys, Fugro Airborne, and Stevens Exploration Management Corp., 2003, Plot files of the airborne geophysical survey data of the southern Delta River area, east-central Alaska: Geophysical Report GPR 2003-5, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

    Online Links:

    Other_Citation_Details: 1 DVD
    Type_of_Source_Media: paper
    Source_Contribution: Data collection, processing, and delivery

    Burns, L.E. and Clautice, K.H., 2003 (source 23 of 46)
    Burns, L.E., and Clautice, K.H., 2003, Portfolio of aeromagnetic and resistivity maps of the southern Delta River area, east-central Alaska: Geophysical Report GPR 2003-8, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

    Online Links:

    Other_Citation_Details: 15 p
    Type_of_Source_Media: paper
    Source_Contribution: Data collection, processing, and delivery

    Pritchard, R.A. and Fugro Airborne Surveys, 2003 (source 24 of 46)
    Pritchard, R.A., and Surveys, Fugro Airborne, 2003, Project report of the airborne geophysical survey for the southern Delta River area, east-central Alaska: Geophysical Report GPR 2003-7, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

    Online Links:

    Other_Citation_Details: 252 p., 2 sheets, scale 1:63,360
    Type_of_Source_Media: paper
    Source_Scale_Denominator: 63360
    Source_Contribution: Data collection, processing, and delivery

    Alaska Division of Geological & Geophysical Surveys and others, 1994 (source 25 of 46)
    Alaska Division of Geological & Geophysical Surveys, WGM, Inc., and Dighem, 1994, 7200 Hz resistivity contours of Valdez Creek mining district: Public Data File PDF 94-22, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

    Online Links:

    Other_Citation_Details: 1 sheet, scale 1:63,360
    Type_of_Source_Media: paper
    Source_Scale_Denominator: 63360
    Source_Contribution: Data collection, processing, and delivery

    Alaska Division of Geological & Geophysical Surveys and others, 1994 (source 26 of 46)
    Alaska Division of Geological & Geophysical Surveys, WGM, Inc., and Dighem, 1994, 900 Hz resistivity contours of Valdez Creek mining district: Public Data File PDF 94-21, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

    Online Links:

    Other_Citation_Details: 1 sheet, scale 1:63,360
    Type_of_Source_Media: paper
    Source_Scale_Denominator: 63360
    Source_Contribution: Data collection, processing, and delivery

    Alaska Division of Geological & Geophysical Surveys and others, 1994 (source 27 of 46)
    Alaska Division of Geological & Geophysical Surveys, WGM, Inc., and Dighem, 1994, Clear mylar version of RI 94-4: Total field magnetics and electromagnetic anomalies of the Valdez Creek mining district: Public Data File PDF 94-24, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

    Online Links:

    Other_Citation_Details: 1 sheet, scale 1:63,360
    Type_of_Source_Media: paper
    Source_Scale_Denominator: 63360
    Source_Contribution: Data collection, processing, and delivery

    Alaska Division of Geological & Geophysical Surveys and others, 1994 (source 28 of 46)
    Alaska Division of Geological & Geophysical Surveys, WGM, Inc., and Dighem, 1994, Filtered total field VLF contours of Valdez Creek mining district: Public Data File PDF 94-23, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

    Online Links:

    Other_Citation_Details: 1 sheet, scale 1:63,360
    Type_of_Source_Media: paper
    Source_Scale_Denominator: 63360
    Source_Contribution: Data collection, processing, and delivery

    Alaska Division of Geological & Geophysical Surveys and others, 1994 (source 29 of 46)
    Alaska Division of Geological & Geophysical Surveys, WGM, Inc., and Dighem, 1994, Flight lines of Valdez Creek mining district: Public Data File PDF 94-20, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

    Online Links:

    Other_Citation_Details: 1 sheet, scale 1:63,360
    Type_of_Source_Media: paper
    Source_Scale_Denominator: 63360
    Source_Contribution: Data collection, processing, and delivery

    Burns, L.E. and others, 2019 (source 30 of 46)
    Burns, L.E., Barefoot, J.D., Woods, Rebecca-Ellen, WGM Mining and Geological Consultants, Inc., and Dighem Surveys and Processing, 2019, Valdez Creek electromagnetic and magnetic airborne geophysical survey data compilation: Geophysical Report GPR 2019-5, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

    Online Links:

    Other_Citation_Details: 4 p
    Type_of_Source_Media: paper
    Source_Contribution: Data collection, processing, and delivery

    Burns, L.E. and others, 2004 (source 31 of 46)
    Burns, L.E., Fugro Airborne Surveys Corp., and Stevens Exploration Management Corp., 2004, 7200 Hz coplanar apparent resistivity of Valdez Creek mining district, central Alaska: Geophysical Report GPR 2004-3-2B, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

    Online Links:

    Other_Citation_Details: 1 sheet, scale 1:63,360
    Type_of_Source_Media: paper
    Source_Scale_Denominator: 63360
    Source_Contribution: Data collection, processing, and delivery

    Burns, L.E. and others, 2004 (source 32 of 46)
    Burns, L.E., Fugro Airborne Surveys Corp., and Stevens Exploration Management Corp., 2004, 7200 Hz coplanar apparent resistivity of the Valdez Creek mining district, central Alaska: Geophysical Report GPR 2004-3-2A, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

    Online Links:

    Other_Citation_Details: 1 sheet, scale 1:63,360
    Type_of_Source_Media: paper
    Source_Scale_Denominator: 63360
    Source_Contribution: Data collection, processing, and delivery

    Burns, L.E. and others, 2004 (source 33 of 46)
    Burns, L.E., Fugro Airborne Surveys Corp., and Stevens Exploration Management Corp., 2004, 900 Hz coplanar apparent resistivity of the Valdez Creek mining district, central Alaska: Geophysical Report GPR 2004-3-3A, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

    Online Links:

    Other_Citation_Details: 1 sheet, scale 1:63,360
    Type_of_Source_Media: paper
    Source_Scale_Denominator: 63360
    Source_Contribution: Data collection, processing, and delivery

    Burns, L.E. and others, 2004 (source 34 of 46)
    Burns, L.E., Fugro Airborne Surveys Corp., and Stevens Exploration Management Corp., 2004, 900 Hz coplanar apparent resistivity of the Valdez Creek mining district, central Alaska: Geophysical Report GPR 2004-3-3B, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

    Online Links:

    Other_Citation_Details: 1 sheet, scale 1:63,360
    Type_of_Source_Media: paper
    Source_Scale_Denominator: 63360
    Source_Contribution: Data collection, processing, and delivery

    Burns, L.E. and others, 2004 (source 35 of 46)
    Burns, L.E., Fugro Airborne Surveys Corp., and Stevens Exploration Management Corp., 2004, Line, gridded, and vector data, and selected plot files of the airborne geophysical survey data of the Valdez Creek mining district, central Alaska: Geophysical Report GPR 2004-3, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

    Online Links:

    Other_Citation_Details: 1 DVD
    Type_of_Source_Media: paper
    Source_Contribution: Data collection, processing, and delivery

    Burns, L.E. and others, 2004 (source 36 of 46)
    Burns, L.E., Fugro Airborne Surveys Corp., and Stevens Exploration Management Corp., 2004, Total magnetic field of the Valdez Creek mining district, central Alaska: Geophysical Report GPR 2004-3-1A, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

    Online Links:

    Other_Citation_Details: 1 sheet, scale 1:63,360
    Type_of_Source_Media: paper
    Source_Scale_Denominator: 63360
    Source_Contribution: Data collection, processing, and delivery

    Burns, L.E. and others, 2004 (source 37 of 46)
    Burns, L.E., Fugro Airborne Surveys Corp., and Stevens Exploration Management Corp., 2004, Total magnetic field of the Valdez Creek mining district, central Alaska: Geophysical Report GPR 2004-3-1B, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

    Online Links:

    Other_Citation_Details: 1 sheet, scale 1:63,360
    Type_of_Source_Media: paper
    Source_Scale_Denominator: 63360
    Source_Contribution: Data collection, processing, and delivery

    DGGS Staff and others, 1994 (source 38 of 46)
    Staff, DGGS, Dighem, and WGM, Inc., 1994, 900 Hz coplanar resistivity of the Valdez Creek mining district: Report of Investigation RI 94-21, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

    Online Links:

    Other_Citation_Details: 1 sheet, scale 1:63,360
    Type_of_Source_Media: paper
    Source_Scale_Denominator: 63360
    Source_Contribution: Data collection, processing, and delivery

    DGGS Staff and others, 1994 (source 39 of 46)
    Staff, DGGS, Dighem, and WGM, Inc., 1994, CD-ROM digital archive files of 1993 survey data for Nome, Circle, Nyac, and Valdez Creek mining districts: Public Data File PDF 94-15, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

    Online Links:

    Other_Citation_Details: 22 p
    Type_of_Source_Media: paper
    Source_Contribution: Data collection, processing, and delivery

    DGGS Staff and others, 1994 (source 40 of 46)
    Staff, DGGS, WGM, Inc., and Dighem, 1994, 7200 HZ Coplanar Resistivity of the Valdez Creek Mining district: Report of Investigation RI 94-20, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

    Online Links:

    Other_Citation_Details: 1 sheet, scale 1:63,360
    Type_of_Source_Media: paper
    Source_Scale_Denominator: 63360
    Source_Contribution: Data collection, processing, and delivery

    DGGS Staff and others, 1994 (source 41 of 46)
    Staff, DGGS, WGM, Inc., and Dighem, 1994, Digital gridded data of total field magnetics and electromagnetics for entire survey of Valdez Creek mining district: Public Data File PDF 94-35, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

    Online Links:

    Other_Citation_Details: 1 DVD
    Type_of_Source_Media: paper
    Source_Contribution: Data collection, processing, and delivery

    DGGS Staff and others, 1994 (source 42 of 46)
    Staff, DGGS, WGM, Inc., and Dighem, 1994, Total field magnetics and electromagnetic anomalies of the Valdez Creek mining district: Report of Investigation RI 94-4, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

    Online Links:

    Other_Citation_Details: 1 sheet, scale 1:63,360
    Type_of_Source_Media: paper
    Source_Scale_Denominator: 63360
    Source_Contribution: Data collection, processing, and delivery

    DGGS Staff and others, 1994 (source 43 of 46)
    Staff, DGGS, WGM, Inc., and Dighem, 1994, Total field magnetics of the Valdez Creek mining district: Report of Investigation RI 94-18, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

    Online Links:

    Other_Citation_Details: 1 sheet, scale 1:63,360
    Type_of_Source_Media: paper
    Source_Scale_Denominator: 63360
    Source_Contribution: Data collection, processing, and delivery

    McConnell, D.L., 1994 (source 44 of 46)
    McConnell, D.L., 1994, Final summary of 1993 airborne geophysical surveys of the Nome, Circle, Nyac, and Valdez Creek areas: Public Data File PDF 94-36, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

    Online Links:

    Other_Citation_Details: 327 p., 4 sheets, scale 1:63,360
    Type_of_Source_Media: paper
    Source_Scale_Denominator: 63360
    Source_Contribution: Data collection, processing, and delivery

    Burns, L.E. and others, 2019 (source 45 of 46)
    Burns, L.E., Barefoot, J.D., Naibert, T.J., and Fugro GeoServices, Inc., 2019, Wrangellia electromagnetic and magnetic airborne geophysical survey (data compilation): Geophysical Report GPR 2018-8, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

    Online Links:

    Other_Citation_Details: 3 p
    Type_of_Source_Media: paper
    Source_Contribution: Data collection, processing, and delivery

    Burns, L.E. and others, 2014 (source 46 of 46)
    Burns, L.E., CGG, and Fugro GeoServices, Inc., 2014, Wrangellia survey area: Airborne magnetic and electromagnetic data in line (point), grid, vector, and map formats, Talkeetna Mountains, Healy, and Mt. Hayes quadrangles, south-central Alaska: Geophysical Report GPR 2014-1, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

    Online Links:

    Other_Citation_Details: 56 sheets, scale 1:63,360, 1 DVD
    Type_of_Source_Media: paper
    Source_Scale_Denominator: 63360
    Source_Contribution: Data collection, processing, and delivery

  2. How were the data generated, processed, and modified?

    Date: 2013 (process 1 of 3)
    Gridded data - The gridded data from the Wrangellia, Iron Creek, Southern Delta River, Valdez Creek, and Nikolai geophysical surveys were merged. The diurnally corrected magnetic data were adjusted for regional variations i.e. IGRF gradient. The residual grids of all the areas may, therefore, have different base values dependent on the IGRF model used for each grid. The grids were adjusted to each other prior to the final merge. Prior to merging the gridded data for Iron Creek with the 2013 Wrangellia survey, the coplanar data were multiplied by a factor of 2, and the resistivity was recalculated with higher upper limits of apparent resistivity, which are now used in processing more recent datasets. The data were re gridded and merged with the Wrangellia resistivity grids. Oasis Montaj grid "Suture" technique with the "No De-trending" option was used to merge the grids. The process requires selecting a "master" grid or the grid that all other grids will be leveled to. The grid that was published first is usually chosen and the grid from the most recent survey was selected as the secondary grid (i.e. the grid that will be DC shifted to the master grid).

    Date: 2017 (process 2 of 3)
    Boundary - DGGS staff constructed a boundary of the merged grid file. The grid boundary was constructed using Geosoft Oaisis montaj grid outline and map export functions. The boundary file is available in Geosft PLY ASCII format and ESRI Shapefile format.

    Date: 2018 (process 3 of 3)
    Google Earth KMZ files - DGGS staff created Google Earth KMZ/KML files from the grid files data using ESRI ArcGIS software.

  3. What similar or related data should the user be aware of?

    Geological Survey of Canada, and U.S. Geological Survey, 2015, Yukon - eastern Alaska magnetic grid: Natural Resources Canada, Canada.

    Online Links:


How reliable are the data; what problems remain in the data set?

  1. How well have the observations been checked?

    All originating data met contract specifications with a few exceptions due to difficult operational conditions. These exceptions did not noticeably impact data quality. Additional detail about contract specifications and operational issues can be found in the metadata of the originating surveys.

  2. How accurate are the geographic locations?

    All originating data were positioned by DGPS (Differential Global Positioning System) with an accuracy of 5 meters or better.

  3. How accurate are the heights or depths?

  4. Where are the gaps in the data? What is missing?

    Helicopter and fixed wing geophysical surveys often have small data gaps that do not negatively impact the overall quality of the final products. Reference the metadata for each originating survey for specific details.

  5. How consistent are the relationships among the observations, including topology?

    These data originate from multiple similar geophysical surveys with different specifications. Reference the metadata of each originating survey for exact specifications.


How can someone get a copy of the data set?

Are there legal restrictions on access or use of the data?

Access_Constraints:
This report, map, and/or dataset is available directly from the State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys (see contact information below).
Use_Constraints:
Any hard copies or published datasets utilizing these datasets shall clearly indicate their source. If the user has modified the data in any way, the user is obligated to describe the types of modifications the user has made. The user specifically agrees not to misrepresent these datasets, nor to imply that changes made by the user were approved by the State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys. The State of Alaska makes no express or implied warranties (including warranties for merchantability and fitness) with respect to the character, functions, or capabilities of the electronic data or products or their appropriateness for any user's purposes. In no event will the State of Alaska be liable for any incidental, indirect, special, consequential, or other damages suffered by the user or any other person or entity whether from the use of the electronic services or products or any failure thereof or otherwise. In no event will the State of Alaska's liability to the Requestor or anyone else exceed the fee paid for the electronic service or product.

  1. Who distributes the data set? (Distributor 1 of 1)

    Alaska Division of Geological & Geophysical Surveys
    Metadata Manager
    3354 College Road
    Fairbanks, AK 99709-3707
    USA

    (907)451-5020 (voice)
    (907)451-5050 (FAX)
    dggspubs@alaska.gov

    Hours_of_Service: 8 am to 4:30 pm, Monday through Friday, except State holidays
  2. What's the catalog number I need to order this data set?

    DDS 12

  3. What legal disclaimers am I supposed to read?

    The State of Alaska makes no expressed or implied warranties (including warranties for merchantability and fitness) with respect to the character, functions, or capabilities of the electronic data or products or their appropriateness for any user's purposes. In no event will the State of Alaska be liable for any incidental, indirect, special, consequential, or other damages suffered by the user or any other person or entity whether from the use of the electronic services or products or any failure thereof or otherwise. In no event will the State of Alaska's liability to the Requestor or anyone else exceed the fee paid for the electronic service or product.

  4. How can I download or order the data?


Who wrote the metadata?

Dates:
Last modified: 22-Jul-2019
Metadata author:
Alaska Division of Geological & Geophysical Surveys
Attn: Simone Montayne
Metadata Manager
3354 College Road
Fairbanks, AK 99709-3707
USA

(907)451-5020 (voice)
(907)451-5050 (FAX)
dggspubs@alaska.gov

Hours_of_Service: 8 am to 4:30 pm, Monday through Friday, except State holidays
Metadata standard:
FGDC Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)
Metadata extensions used:


Generated by mp version 2.9.21 on Mon Jul 22 15:48:16 2019