Kuskokwim airborne magnetic and radiometric geophysical survey, Ganes Creek, Alaska (2026)

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Frequently anticipated questions:


What does this data set describe?

Title:
Kuskokwim airborne magnetic and radiometric geophysical survey, Ganes Creek, Alaska (2026)
Abstract:
Kuskokwim airborne magnetic and radiometric geophysical survey, Ganes Creek, Alaska (2026), Geophysical Report 2026-1, survey covers part of the Kuskokwim Mountains west of McGrath, Alaska. The survey area includes parts of the Ophir, Medfra, Iditarod, and McGrath quadrangles. EON Geosciences Inc. collected magnetic and radiometric data with a Eurocopter AS350 B2 helicopter from June 21 to September 7, 2024, and a Eurocopter AS350 B3+ helicopter from June 16 to 25, 2025. A total of 25,731 line kilometers were collected, covering 8,197 km2. Magnetic data were collected with a Scintrex CS-3 cesium-vapour split-beam sensor. Radiometric data were collected with two Radiation Solutions RS-500 series multi-channel gamma-ray spectrometers, model RSX-5, with 512 channels, for a total crystal volume of 33.6 liters downward-looking and 8.4 liters upward-looking (for atmospheric radon detection). Data from the Ganes Creek survey will improve the understanding of the geology and mineral potential of the central Kuskokwim River region and promote resource exploration in this part of Alaska. These data are provided as a Geophysical Report under an open end-user license and are available from the DGGS website https://doi.org/10.14509/31746.
Supplemental_Information:
ascii_data:    ASCII format line data, other ASCII data	
databases_geosoft:    Geosoft format database of final line data, other Geosoft format databases	
documents:    Project report, calibration reports	
grids_geosoft:    Oasis montaj Geosoft GRD format gridded data	
grids_tif:    Geographically registered data value rasters of gridded data, GeoTiff format	
kmz:    Keyhole Markup Language (KML) kmz archive files of project data. Viewable on Google Earth and other compatible programs	
maps_pdf:    Printable and geographically registered maps in pdf format.	
vector_data:    Line path and survey boundary in Esri shapefile (shp) format
  1. How might this data set be cited?
    Fusso, L.A., Petersen, E.I., Emond, A.M., and Inc., EON Geosciences, 2026, Kuskokwim airborne magnetic and radiometric geophysical survey, Ganes Creek, Alaska (2026): Geophysical Report GPR 2026-1, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

    Online Links:

    Other_Citation_Details: 16 p.
  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -158.421676
    East_Bounding_Coordinate: -154.273849
    North_Bounding_Coordinate: 63.361469
    South_Bounding_Coordinate: 62.210795
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 2024
    Ending_Date: 2025
    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: 4
      Transverse_Mercator:
      Scale_Factor_at_Central_Meridian: 0.999600
      Longitude_of_Central_Meridian: -159
      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 WGS84.
      The ellipsoid used is WGS 84.
      The semi-major axis of the ellipsoid used is 6378137.
      The flattening of the ellipsoid used is 1/298.257223563.
  7. How does the data set describe geographic features?
    ascii_data
    ASCII format line data, other ASCII data (Source: EON Geosciences Inc.)
    databases_geosoft
    Geosoft format database of final line data, other Geosoft format databases (Source: EON Geosciences Inc.)
    documents
    Project report, calibration reports (Source: EON Geosciences Inc. and Alaska Division of Geological & Geophysical Surveys (DGGS))
    grids_geosoft
    Oasis montaj Geosoft GRD format gridded data (Source: EON Geosciences Inc. and Alaska Division of Geological & Geophysical Surveys (DGGS))
    grids_tif
    Geographically registered data value rasters of gridded data, GeoTiff format (Source: Alaska Division of Geological & Geophysical Surveys (DGGS))
    kmz
    Keyhole Markup Language (KML) kmz archive files of project data. Viewable on Google Earth and other compatible programs (Source: Alaska Division of Geological & Geophysical Surveys (DGGS))
    maps_pdf
    Printable and geographically registered maps in pdf format. (Source: EON Geosciences Inc.)
    vector_data
    Line path and survey boundary in Esri shapefile (shp) format (Source: Alaska Division of Geological & Geophysical Surveys (DGGS))

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?
    This work was funded by the United States Geological Survey Earth Mapping Resources Initiative (Earth MRI) grants G22AC00475 and G23AC00408. The authors thank Eon Geosciences for their expertise in geophysical data collections. The views and conclusions contained in this document are those of the authors and should not be interpreted as representing the opinions or policies of the U.S. Geological Survey. Mention of trade names or commercial products does not constitute their endorsement by the U.S. Geological Survey.
  3. To whom should users address questions about the data?
    Alaska Division of Geological & Geophysical Surveys
    Metadata Manager
    3354 College Road
    Fairbanks, AK
    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
    Contact_Instructions:
    Please view our website (https://www.dggs.alaska.gov) for the latest information on available data. Please contact us using the e-mail address provided above when possible.

Why was the data set created?

The purpose of this report is to provide airborne magnetic and radiometric geophysical data to improve understanding of the geology and mineral potential of the central Kuskokwim River region and to support resource exploration efforts. These high-resolution data help identify concealed lithologic contacts, structural features, and alteration zones associated with gold and other metallic mineral deposits.

How was the data set created?

  1. From what previous works were the data drawn?
  2. How were the data generated, processed, and modified?
    Date: 2025 (process 1 of 2)
    Data acquisition - EON Geosciences Inc (fig. 1) collected magnetic and radiometric data with a Eurocopter AS350 B2 helicopter from June 21 to September 7, 2024, and a Eurocopter AS350 B3+ helicopter from June 16 to 25, 2025. A total of 25,731 line kilometers were collected, covering 8,197 km2. Magnetic data were collected with a Scintrex CS-3 cesium-vapour split-beam sensor. Radiometric data were collected with two Radiation Solutions RS-500 series multi-channel gamma-ray spectrometers, model RSX-5, with 512 channels, for a total crystal volume of 33.6 liters downward-looking and 8.4 liters upward-looking (for atmospheric radon detection).
    Date: 2026 (process 2 of 2)
    Data cataloged for archival and publication - Final data were published and archived by DGGS.
  3. What similar or related data should the user be aware of?
    Emond, A.M., and LTD, MPX Geophysics, 2023, Kuskokwim airborne magnetic and radiometric geophysical survey, northern Kuskokwim Mountains: Geophysical Report GPR 2023-1, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

    Online Links:

    Other_Citation_Details: 4 p
    Emond, A.M., Fusso, L.A., and Ltd., Geotech, 2024, Kuskokwim airborne magnetic and radiometric survey, Sischu Mountains: Geophysical Report GPR 2024-1, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

    Online Links:

    Other_Citation_Details: 4 p
    Fusso, L.A., Petersen, E.I., and New Resolution Geophysics, USA, 2025, Kuskokwim airborne magnetic and radiometric survey, Kilbuck and Buckstock Mountains, Alaska: Geophysical Report GPR 2025-5, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

    Online Links:

    Other_Citation_Details: 18 p
    Fusso, L.A., Petersen, E.I., Emond, A.M., and Inc., EON Geosciences, 2025, Kuskokwim airborne magnetic and radiometric survey, northern Kaiyuh Mountains, Alaska: Geophysical Report GPR 2025-3, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

    Online Links:

    Other_Citation_Details: 18 p
    Fusso, L.A., Petersen, E.I., Emond, A.M., and Inc., EON Geosciences, 2026, Kuskokwim airborne magnetics and radiometric geophysical survey, McGrath, Alaska: Geophysical Report GPR 2026-2, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

    Online Links:

    Other_Citation_Details: 17 p
    Petersen, E.I., Fusso, L.A., Emond, A.M., Incorporated, SkyTEM Canada, and Frameworks, Aqua Geo LLC, 2025, Kuskokwim airborne electromagnetic survey, northern Kaiyuh Mountains, Alaska: Geophysical Report GPR 2025-2, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

    Online Links:

    Other_Citation_Details: 8 p
    Petersen, E.I., Fusso, L.A., Ltd., Geotech, and Frameworks, Aqua Geo LLC, 2026, Granite Mountain airborne electromagnetic survey, Kuskokwim Region, Alaska: Geophysical Report GPR 2026-4, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

    Online Links:

    Other_Citation_Details: 8 p
    Petersen, E.I., Fusso, L.A., Ltd., Geotech, and Frameworks, Aqua Geo LLC, 2026, Candle Hills airborne electromagnetic survey, Kuskokwim region, Alaska: Geophysical Report GPR 2026-3, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

    Online Links:

    Other_Citation_Details: 9 p

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

  1. How well have the observations been checked?
    GeophysiScal data were acquired according to the contractor, contract, and request-for-proposals specifications. For additional detail about survey parameters, see the accompanying project report available in the documents directory of this data distribution package.
  2. How accurate are the geographic locations?
    Station coordinates were positioned using a real-time or post-processed corrected differential GPS.
  3. How accurate are the heights or depths?
    Not applicable
  4. Where are the gaps in the data? What is missing?
    The dataset provides processed geophysical and positional data for the entire survey extent.
  5. How consistent are the relationships among the observations, including topology?
    Data were supplied by providers in accordance with DGGS contract requirements (see accompanying project report). The originating coordinate system was retained for all publication products.

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
    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
    Contact_Instructions:
    Please view our website (https://www.dggs.alaska.gov) for the latest information on available data. Please contact us using the e-mail address provided above when possible.
  2. What's the catalog number I need to order this data set? GPR 2026-1
  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: 18-Jun-2026
Metadata author:
Alaska Division of Geological & Geophysical Surveys
Attn: Simone Montayne
Metadata Manager
3354 College Road
Fairbanks, AK
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 2.9.50 on Thu Jun 18 13:34:40 2026