Aniak and the Little Taylor Mountains airborne magnetic and radiometric geophysical survey, Aniak, Alaska

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Frequently anticipated questions:


What does this data set describe?

Title:
Aniak and the Little Taylor Mountains airborne magnetic and radiometric geophysical survey, Aniak, Alaska
Abstract:
Aniak and the Little Taylor Mountains airborne magnetic and radiometric geophysical survey, Aniak, Alaska, Geophysical Report 2026-5, covers parts of the Russian Mission, Sleetmute, Bethel and Taylor Mountains quadrangles of southwestern Alaska. Terraquest Ltd. collected magnetic and radiometric data with a King Air C-90 from June 12 to November 8, 2025; aircraft maintenance caused a pause in survey activities from June 28 through September 9, 2025. A total of 20,090.5 line kilometers were accepted by DGGS, covering 6,957 km2. Magnetic data were collected with a Geometrics Inc G-822A cesium-vapour magnetometer; radiometric data were collected with two (2) Radiation Solutions RS-500 series multi-channel gamma-ray spectrometers, model RS 500, with 512 channels, for a total crystal volume of 33.6 liters downward-looking and 8.4 upward-looking (for atmospheric radon detection). The survey was flown with a line spacing of 400 meters (m) and a nominal ground clearance of 100 m. The data from this survey will improve understanding of the geology and mineral potential and support resource exploration of the central Kuskokwim River region of Alaska. These data and accompanying discussion are released as a DGGS Geophysical Report and are available from the DGGS website at https://doi.org/10.14509/32087.
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., and LTD., Terraquest, 2026, Aniak and the Little Taylor Mountains airborne magnetic and radiometric geophysical survey, Aniak, Alaska: Geophysical Report GPR 2026-5, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

    Online Links:

    Other_Citation_Details: 17 p.
  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -160.098112
    East_Bounding_Coordinate: -156.694820
    North_Bounding_Coordinate: 61.693172
    South_Bounding_Coordinate: 60.651119
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 2025
    Ending_Date: 2026
    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: Terraquest LTD.)
    databases_geosoft
    Geosoft format database of final line data, other Geosoft format databases (Source: Terraquest LTD.)
    documents
    Project report, calibration reports (Source: Terraquest LTD. and Alaska Division of Geological & Geophysical Surveys (DGGS))
    grids_geosoft
    Oasis montaj Geosoft GRD format gridded data (Source: Terraquest LTD. 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: Terraquest LTD.)
    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 G23AC00408 and G24AC00629. 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 publication is to release airborne magnetic and radiometric geophysical data for the Aniak and Little Taylor Mountains sections of the Kuskokwim survey. These data improve understanding of subsurface geology, support evaluation of mineral potential, and strengthen resource exploration efforts in the central Kuskokwim River region. Providing this information enhances Alaska's ability to guide land management, encourage responsible mineral development, and support long-term economic opportunities across the state.

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 - Airborne magnetic and radiometric data were acquired by Terraquest Ltd. using a King Air C-90 from June 12 to November 8, 2025, with survey operations paused for aircraft maintenance from June 28 to September 9, 2025. The survey was flown at 400-m line spacing and a nominal 100-m ground clearance, collecting 20,090.5 accepted line kilometers over 6,957 km2 in the Russian Mission, Sleetmute, Bethel, and Taylor Mountains quadrangles. Magnetic measurements were recorded with a Geometrics G-822A cesium-vapor magnetometer, and radiometric measurements were recorded with two Radiation Solutions RS-500 spectrometers (512 channels; 33.6-L downward-looking and 8.4-L upward-looking).
    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 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
    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, 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
    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

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 2026-5
  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: 08-Jul-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 Wed Jul 08 18:14:44 2026