Identification_Information: Citation: Citation_Information: Originator: Fusso, L.A. Originator: Petersen, E.I. Originator: Emond, A.M. Originator: EON Geosciences Inc. Publication_Date: 2026 Title: Kuskokwim airborne magnetics and radiometric geophysical survey, McGrath, Alaska Geospatial_Data_Presentation_Form: digital, data Series_Information: Series_Name: Geophysical Report Issue_Identification: GPR 2026-2 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 17 p Online_Linkage: https://doi.org/10.14509/31804 Description: Abstract: Kuskokwim airborne magnetics and radiometric geophysical survey, McGrath, Alaska, Geophysical Report 2026-2, covers parts of the Norton Bay, Nulato, Ruby, Unalakleet, Ophir, Medfra, Holy Cross, Iditarod, and McGrath quadrangles. EON Geosciences Inc. collected magnetic and radiometric data with four fixed wing aircraft from June 23 to September 5, 2024, then from June 14 to July 26, 2025. A total of 86,319 line-kilometers were acquired. Magnetic data were collected with a Geometrics G-822A cesium-vapour split-beam sensor; Radiometric data were collected with two (2) 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 upward-looking (for atmospheric radon detection). The McGrath survey was flown with a line spacing of 400 meters (m) and a nominal ground clearance of 100 m. The data from the McGrath airborne magnetic and radiometric geophysical survey will improve understanding of the geology and mineral potential and promote resource exploration of the central Kuskokwim River region of Alaska. These data are provided as a Geophysical Report under an open end-user license and are available on the DGGS website https://doi.org/10.14509/31804. Purpose: 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. 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 Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: 2024 Ending_Date: 2025 Currentness_Reference: ground condition Status: Progress: Complete Maintenance_and_Update_Frequency: None planned Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -159.738208 East_Bounding_Coordinate: -152.915717 North_Bounding_Coordinate: 64.080681 South_Bounding_Coordinate: 61.970973 Keywords: Theme: Theme_Keyword_Thesaurus: ISO 19115 Topic Category Theme_Keyword: geoscientificInformation Theme: Theme_Keyword_Thesaurus: Alaska Division of Geological & Geophysical Surveys Theme_Keyword: Aeromagnetic Theme_Keyword: Aeromagnetic Data Theme_Keyword: Aeromagnetic Map Theme_Keyword: Aeromagnetic Survey Theme_Keyword: Airborne Geophysical Survey Theme_Keyword: Analytic Signal Theme_Keyword: Bedrock Geology Theme_Keyword: Critical Minerals Theme_Keyword: DGGS Theme_Keyword: Earth MRI Theme_Keyword: Economic Geology Theme_Keyword: Economic Study Theme_Keyword: Fixed Wing Survey Theme_Keyword: Geology Theme_Keyword: Geophysical Map Theme_Keyword: Geophysical Survey Theme_Keyword: Geophysics Theme_Keyword: Geophysics Search Tag Theme_Keyword: Gridded Data Theme_Keyword: Magnetic Contours Theme_Keyword: Magnetic Data Theme_Keyword: Magnetic Survey Theme_Keyword: Magnetics Theme_Keyword: Mineral Assessment Theme_Keyword: Mineral Deposit Models Theme_Keyword: Mineral Development Theme_Keyword: Mineral Exploration Theme_Keyword: Mineral Resources Theme_Keyword: Minerals Theme_Keyword: Radiometric Survey Theme_Keyword: Radiometrics Theme_Keyword: Remote Sensing Place: Place_Keyword_Thesaurus: Alaska Division of Geological & Geophysical Surveys Place_Keyword: Aniak Mining District Place_Keyword: Anvik Mining District Place_Keyword: Appel Mountain Place_Keyword: Banner Creek Place_Keyword: Barnhard Creek Place_Keyword: Basin Creek Place_Keyword: Bear Creek Place_Keyword: Bear Island Lake Place_Keyword: Beaver Creek Place_Keyword: Belle Creek Place_Keyword: Berry Lake Place_Keyword: Big Creek Place_Keyword: Big River Place_Keyword: Billy Goat Creek Place_Keyword: Bismarck Creek Place_Keyword: Bismark Creek Place_Keyword: Black Creek Place_Keyword: Black Mountain Place_Keyword: Black River Place_Keyword: Blackwater Creek Place_Keyword: Bonanza Creek Place_Keyword: Bonanza Flats Place_Keyword: Bonnie Creek Place_Keyword: Boob Creek Place_Keyword: Boston Creek Place_Keyword: Boulder Creek Place_Keyword: Bridge Creek Place_Keyword: Broken Snowshoe Creek Place_Keyword: Bryan Creek Place_Keyword: Butte Creek Place_Keyword: Cache Creek Place_Keyword: California Creek Place_Keyword: Camp Creek Place_Keyword: Candle Creek Place_Keyword: Candle Placer Place_Keyword: Canyon Creek Place_Keyword: Caribou Creek Place_Keyword: Carl Creek Place_Keyword: Cash Creek Place_Keyword: Chicken Creek Place_Keyword: Chicken Mountain Place_Keyword: Clear Creek Place_Keyword: Clearwater Creek Place_Keyword: Coffee Creek Place_Keyword: Colorado Creek Place_Keyword: Cottonwood Lake Place_Keyword: Crawson Lake Place_Keyword: Cripple Creek Place_Keyword: Cripple Landing Place_Keyword: Crooked Creek Place_Keyword: Deacons Landing Place_Keyword: Deadwood Creek Place_Keyword: Deep Creek Place_Keyword: Dikeman Place_Keyword: Discovery Place_Keyword: Dishna River Place_Keyword: Doherty Creek Place_Keyword: Dome Creek Place_Keyword: Dominion Creek Place_Keyword: Donlin Creek Place_Keyword: Eagle Creek Place_Keyword: Esperanto Creek Place_Keyword: Esperanto Placer Mine Place_Keyword: Fairbanks Creek Place_Keyword: Farewell Landing Place_Keyword: Finland Creek Place_Keyword: Fire Creek Place_Keyword: Flat Place_Keyword: Flat Creek Place_Keyword: Folger Place_Keyword: Folger Creek Place_Keyword: Fourmile Creek Place_Keyword: Fourmile Lake 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Place_Keyword: Julian Creek Place_Keyword: Julie Creek Place_Keyword: Kaiyuh Mining District Place_Keyword: Kaiyuh Mountains Place_Keyword: Katlitna River Place_Keyword: Khotol River Place_Keyword: King Creek Place_Keyword: Kuskokwim River Place_Keyword: Lake Creek Place_Keyword: Ledge Creek Place_Keyword: Little Caribou Creek Place_Keyword: Little Creek Place_Keyword: Lone Jim Mountain Place_Keyword: Lonesome Hills Place_Keyword: Long Creek Place_Keyword: Lookout Mountain Place_Keyword: Lost River Place_Keyword: Lower Telida Lake Place_Keyword: Madison Creek Place_Keyword: Madison Mountain Place_Keyword: Mammoth Creek Place_Keyword: Martin Creek Place_Keyword: Mastodon Creek Place_Keyword: McGrath Place_Keyword: McGrath Mining District Place_Keyword: Meadow Creek Place_Keyword: Medfra Place_Keyword: Medicine Creek Place_Keyword: Michigan Creek Place_Keyword: Minnie Creek Place_Keyword: Misdi Place_Keyword: Montana Creek Place_Keyword: Moore Creek Place_Keyword: Moose Creek Place_Keyword: Morgan Island Place_Keyword: Mosquito Mountain Place_Keyword: Mud River Place_Keyword: Munther Creek Place_Keyword: Murray Creek Place_Keyword: Mystery Creek Place_Keyword: Netletna River Place_Keyword: Nikolai Place_Keyword: Nixon Fork Place_Keyword: Nowitna River Place_Keyword: Nunivak Bar Place_Keyword: Nunsatuk River Place_Keyword: Ophir Creek Place_Keyword: Otter Creek Place_Keyword: Our Creek Place_Keyword: Peary Creek Place_Keyword: Pedro Creek Place_Keyword: Pilot Creek Place_Keyword: Poison Creek Place_Keyword: Pontag Creek Place_Keyword: Poorman Creek Place_Keyword: Porcupine Ridge Place_Keyword: Porphyry Hill Place_Keyword: Prince Creek Place_Keyword: Reed Lake Place_Keyword: Reindeer River Place_Keyword: Roundabout Mountain Place_Keyword: Ruby Creek Place_Keyword: Ruby Mining District Place_Keyword: Saddle Mountain Place_Keyword: Salmonberry Lake Place_Keyword: Scandinavian Creek Place_Keyword: Scow Harry Creek Place_Keyword: Selatna Mountain Place_Keyword: Selatna River Place_Keyword: Shageluk Place_Keyword: Shageluk Lake Place_Keyword: Shoaty Creek Place_Keyword: Shoaty Mountain Place_Keyword: Silver Creek Place_Keyword: Skookum Creek Place_Keyword: Slate Creek Place_Keyword: Slow Creek Place_Keyword: Smith Creek Place_Keyword: Smittys Lake Place_Keyword: Soda Creek Place_Keyword: Spruce Lined Creek Place_Keyword: Starr Creek Place_Keyword: Stink Creek Place_Keyword: Sugarloaf Mountain Place_Keyword: Sulukna River Place_Keyword: Sunrise Creek Place_Keyword: Sunset Creek Place_Keyword: Susulatna River Place_Keyword: Taft Creek Place_Keyword: Takotna River Place_Keyword: Tango Creek Place_Keyword: Tatalina River Place_Keyword: Telida Place_Keyword: Timber Creek Place_Keyword: Tolstoi Creek Place_Keyword: Tonclonkna Creek Place_Keyword: Tonclonukna Creek Place_Keyword: Tonlhona Creek Place_Keyword: Tonzona River Place_Keyword: Towahmina Lake Place_Keyword: Trail Creek Place_Keyword: Travis Cabin Place_Keyword: Twin Island Creek Place_Keyword: Twomile Creek Place_Keyword: Uyakturok Creek Place_Keyword: Vinasale Place_Keyword: Vinasale Mountain Place_Keyword: Wabash Creek Place_Keyword: Wapoo Creek Place_Keyword: Weir Island Place_Keyword: Widgeon Creek Place_Keyword: Willow Creek Place_Keyword: Wilson Creek Place_Keyword: Wilson Lake Place_Keyword: Windy Creek Place_Keyword: Wolf Mountain Place_Keyword: Wolverine Creek Place_Keyword: Yukon River Place_Keyword: Zimmerman Creek 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. Point_of_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: Alaska Division of Geological & Geophysical Surveys Contact_Position: GIS Manager Contact_Address: Address_Type: mailing and physical Address: 3354 College Rd City: Fairbanks State_or_Province: AK Postal_Code: 99709-3707 Country: USA Contact_Voice_Telephone: 907-451-5020 Contact_Electronic_Mail_Address: dggsgis@alaska.gov Hours_of_Service: 8 am to 4:30 pm, Monday through Friday, except State holidays Data_Set_Credit: 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 collection. 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. Cross_Reference: Citation_Information: Originator: Emond, A.M. Originator: MPX Geophysics LTD Publication_Date: 2023 Title: Kuskokwim airborne magnetic and radiometric geophysical survey, northern Kuskokwim Mountains Series_Information: Series_Name: Geophysical Report Issue_Identification: GPR 2023-1 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 4 p Online_Linkage: https://doi.org/10.14509/31087 Cross_Reference: Citation_Information: Originator: Emond, A.M. Originator: Fusso, L.A. Originator: Geotech Ltd. Publication_Date: 2024 Title: Kuskokwim airborne magnetic and radiometric survey, Sischu Mountains Series_Information: Series_Name: Geophysical Report Issue_Identification: GPR 2024-1 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 4 p Online_Linkage: https://doi.org/10.14509/31094 Cross_Reference: Citation_Information: Originator: Fusso, L.A. Originator: Petersen, E.I. Originator: New Resolution Geophysics, USA Publication_Date: 2025 Title: Kuskokwim airborne magnetic and radiometric survey, Kilbuck and Buckstock Mountains, Alaska Series_Information: Series_Name: Geophysical Report Issue_Identification: GPR 2025-5 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 18 p Online_Linkage: https://doi.org/10.14509/31724 Cross_Reference: Citation_Information: Originator: Fusso, L.A. Originator: Petersen, E.I. Originator: Emond, A.M. Originator: EON Geosciences Inc. Publication_Date: 2025 Title: Kuskokwim airborne magnetic and radiometric survey, northern Kaiyuh Mountains, Alaska Series_Information: Series_Name: Geophysical Report Issue_Identification: GPR 2025-3 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 18 p Online_Linkage: https://doi.org/10.14509/31493 Data_Quality_Information: Attribute_Accuracy: Attribute_Accuracy_Report: Geophysical 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. Logical_Consistency_Report: 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. Completeness_Report: The dataset provides processed geophysical and positional data for the entire survey extent. Positional_Accuracy: Horizontal_Positional_Accuracy: Horizontal_Positional_Accuracy_Report: Station coordinates were positioned using a real-time or post-processed corrected differential GPS. Vertical_Positional_Accuracy: Vertical_Positional_Accuracy_Report: Not applicable Lineage: Process_Step: Process_Description: Data acquisition - EON Geosciences Inc. collected magnetic and radiometric data with four fixed wing aircraft from June 23 to September 5, 2024, then from June 14 to July 26, 2025. A total of 86,319 line-kilometers were acquired. Magnetic data were collected with a Geometrics G-822A cesium-vapour split-beam sensor; Radiometric data were collected with two (2) 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 upward-looking (for atmospheric radon detection). The McGrath survey was flown with a line spacing of 400 meters (m) and a nominal ground clearance of 100 m. Process_Date: 2025 Process_Step: Process_Description: Data cataloged for archival and publication - Final data were published and archived by DGGS. Process_Date: 2026 Spatial_Data_Organization_Information: Direct_Spatial_Reference_Method: raster Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Planar: Grid_Coordinate_System: 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_Coordinate_Information: Planar_Coordinate_Encoding_Method: coordinate pair Coordinate_Representation: Abscissa_Resolution: .00000001 Ordinate_Resolution: .00000001 Planar_Distance_Units: Meters Geodetic_Model: Horizontal_Datum_Name: WGS84 Ellipsoid_Name: WGS 84 Semi-major_Axis: 6378137 Denominator_of_Flattening_Ratio: 298.257223563 Entity_and_Attribute_Information: Detailed_Description: Entity_Type: Entity_Type_Label: ascii_data Entity_Type_Definition: ASCII format line data, other ASCII data Entity_Type_Definition_Source: EON Geosciences Inc. Entity_Attribute_Layer_Name: ascii_data Detailed_Description: Entity_Type: Entity_Type_Label: databases_geosoft Entity_Type_Definition: Geosoft format database of final line data, other Geosoft format databases Entity_Type_Definition_Source: EON Geosciences Inc. Entity_Attribute_Layer_Name: databases_geosoft Detailed_Description: Entity_Type: Entity_Type_Label: documents Entity_Type_Definition: Project report, calibration reports Entity_Type_Definition_Source: EON Geosciences Inc. and Alaska Division of Geological & Geophysical Surveys (DGGS) Entity_Attribute_Layer_Name: documents Detailed_Description: Entity_Type: Entity_Type_Label: grids_geosoft Entity_Type_Definition: Oasis montaj Geosoft GRD format gridded data Entity_Type_Definition_Source: EON Geosciences Inc. and Alaska Division of Geological & Geophysical Surveys (DGGS) Entity_Attribute_Layer_Name: grids_geosoft Detailed_Description: Entity_Type: Entity_Type_Label: grids_tif Entity_Type_Definition: Geographically registered data value rasters of gridded data, GeoTiff format Entity_Type_Definition_Source: Alaska Division of Geological & Geophysical Surveys (DGGS) Entity_Attribute_Layer_Name: grids_tif Detailed_Description: Entity_Type: Entity_Type_Label: kmz Entity_Type_Definition: Keyhole Markup Language (KML) kmz archive files of project data. Viewable on Google Earth and other compatible programs Entity_Type_Definition_Source: Alaska Division of Geological & Geophysical Surveys (DGGS) Entity_Attribute_Layer_Name: kmz Detailed_Description: Entity_Type: Entity_Type_Label: maps_pdf Entity_Type_Definition: Printable and geographically registered maps in pdf format. Entity_Type_Definition_Source: EON Geosciences Inc. Entity_Attribute_Layer_Name: maps_pdf Detailed_Description: Entity_Type: Entity_Type_Label: vector_data Entity_Type_Definition: Line path and survey boundary in Esri shapefile (shp) format Entity_Type_Definition_Source: Alaska Division of Geological & Geophysical Surveys (DGGS) Entity_Attribute_Layer_Name: vector_data Distribution_Information: Distributor: Contact_Information: Contact_Organization_Primary: Contact_Organization: State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys Contact_Address: Address_Type: mailing and physical Address: 3354 College Road City: Fairbanks State_or_Province: AK Postal_Code: 99709-3707 Country: USA Contact_Voice_Telephone: 907-451-5020 Contact_Facsimile_Telephone: 907-451-5050 Contact_Electronic_Mail_Address: dggspubs@alaska.gov Hours_of_Service: 8 am to 4:30 pm, Monday through Friday, except State holidays Contact_Instructions: Please view our website (http://www.dggs.alaska.gov) for the latest information on available data. Please contact us using the e-mail address provided above when possible. Resource_Description: GPR 2026-2 Distribution_Liability: The State of Alaska makes no express or implied warranties (including warranties of merchantability and fitness) with respect to the character, function, or capabilities of the electronic services 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, any failure thereof, or otherwise, and 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. Standard_Order_Process: Non-digital_Form: DGGS publications are available as free online downloads or you may purchase paper hard-copies or digital files on CD/DVD or other digital storage media by mail, phone, fax, or email from the DGGS Fairbanks office. To purchase this or other printed reports and maps, contact DGGS by phone (907-451-5020), e-mail (dggspubs@alaska.gov), or fax (907-451-5050). Payment accepted: Cash, check, money order, VISA, or MasterCard. Turnaround time is 1-2 weeks unless special arrangements are made and an express fee is paid. Shipping charge will be the actual cost of postage and will be added to the total amount due. Contact us for the exact shipping amount. Fees: see http://dx.doi.org/10.14509/31804 Standard_Order_Process: Digital_Form: Digital_Transfer_Information: Format_Name: GeoTiff, ESRI shapefile, Geosoft binary grid (GRD), Microsoft Office documents, PDF (with or without georeferencing), ER Mapper ERS, ASCII text files (including CSV), Geosoft database, AutoCAD DXF, Geosoft plot file (PLT), digital images (multiple formats), georeferenced photos (multiple formats), Geosoft ASCII XYZ, Geosoft ASCII files (PLY, i0, EXP), and KMZ. Format_Version_Date: 20260616 Format_Information_Content: Airborne electromagnetic geophysical survey data compilation Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: http://dx.doi.org/10.14509/31804 Fees: Free download Metadata_Reference_Information: Metadata_Date: 20260616 Metadata_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Simone Montayne Contact_Address: Address_Type: mailing and physical Address: 3354 College Road City: Fairbanks State_or_Province: AK Postal_Code: 99709-3707 Country: USA Contact_Voice_Telephone: 907-451-5020 Metadata_Standard_Name: FGDC Content Standard for Digital Geospatial Metadata Metadata_Standard_Version: FGDC-STD-001-1998 Metadata_Use_Constraints: If the user has modified this metadata file in any way, the user is obligated to describe the types of modifications the user has made. User specifically agrees not to misrepresent this metadata file, 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. Metadata_Extensions: Online_Linkage: http://www.dggs.alaska.gov/metadata/dggs.ext Profile_Name: dggs metadata extensions