Identification_Information: Citation: Citation_Information: Originator: Fusso, L.A. Originator: Petersen, E.I. Originator: Terraquest LTD. Publication_Date: 2026 Title: Aniak and the Little Taylor Mountains airborne magnetic and radiometric geophysical survey, Aniak, Alaska Geospatial_Data_Presentation_Form: digital, data Series_Information: Series_Name: Geophysical Report Issue_Identification: GPR 2026-5 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/10.14509/32087 Description: 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. Purpose: 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. 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: 2025 Ending_Date: 2026 Currentness_Reference: ground condition Status: Progress: Complete Maintenance_and_Update_Frequency: None planned Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -160.098112 East_Bounding_Coordinate: -156.694820 North_Bounding_Coordinate: 61.693172 South_Bounding_Coordinate: 60.651119 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: Exploration 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: Magnetic Susceptibility 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: Plutonic Hosted Theme_Keyword: Plutonic Rocks Theme_Keyword: Plutons Theme_Keyword: Radiometric Survey Theme_Keyword: Radiometrics Theme_Keyword: Remote Sensing Place: Place_Keyword_Thesaurus: Alaska Division of Geological & Geophysical Surveys Place_Keyword: Aghaluk Creek Place_Keyword: Aniak Place_Keyword: Aniak Mining District Place_Keyword: Aniak River Place_Keyword: Bairo Creek Place_Keyword: Beaver Creek Place_Keyword: Bristol Bay Region Mining District Place_Keyword: Buckstock River Place_Keyword: Chichitnok River Place_Keyword: Chicken Creek Place_Keyword: Chikululnuk Creek Place_Keyword: Chuathbaluk Place_Keyword: Chukowan River Place_Keyword: Cinnabar Creek Place_Keyword: Crow Village Place_Keyword: Discovery Creek Place_Keyword: Doestock Creek Place_Keyword: Enatalik Creek Place_Keyword: Fork Creek Place_Keyword: Gemuk River Place_Keyword: Gibralter Point Place_Keyword: Holitna River Place_Keyword: Holokuk River Place_Keyword: Iditarod Mining District Place_Keyword: Kashegelok Place_Keyword: Kiknik Creek Place_Keyword: Kipchuk River Place_Keyword: Kogoyuk Creek Place_Keyword: Kogrukluk River Place_Keyword: Kolmakof Place_Keyword: Kolmakof Lake Place_Keyword: Kolmakof River Place_Keyword: Kuskokwim River Place_Keyword: Little Taylor Mountains Place_Keyword: Mission Creek Place_Keyword: Napaimiut Place_Keyword: New York Creek Place_Keyword: Nushagak Hills Place_Keyword: Oksotalik Creek Place_Keyword: Ophir Creek Place_Keyword: Owhat River Place_Keyword: Pearl Creek Place_Keyword: Pioneer Creek Place_Keyword: Polly Creek Place_Keyword: Salmon River Place_Keyword: Sawpit Creek Place_Keyword: Shotgun Creek Place_Keyword: Suter Creek Place_Keyword: Swift Creek Place_Keyword: Swift River Place_Keyword: Tabasco Creek Place_Keyword: Taylor Creek Place_Keyword: Taylor Mountains Mine Place_Keyword: Timber Creek Place_Keyword: Titnuk Creek Place_Keyword: Titnum Creek Place_Keyword: Veahna Creek Place_Keyword: Victoria Creek Place_Keyword: Whitefish Lake Place_Keyword: Whitewater 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: Metadata Manager 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 (https://www.dggs.alaska.gov) for the latest information on available data. Please contact us using the e-mail address provided above when possible. Data_Set_Credit: 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. 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 Cross_Reference: Citation_Information: Originator: Fusso, L.A. Originator: Petersen, E.I. Originator: Emond, A.M. Originator: EON Geosciences Inc. Publication_Date: 2026 Title: Kuskokwim airborne magnetic and radiometric geophysical survey, Ganes Creek, Alaska (2026) Series_Information: Series_Name: Geophysical Report Issue_Identification: GPR 2026-1 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 16 p Online_Linkage: https://doi.org/10.14509/31746 Cross_Reference: 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 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 Cross_Reference: Citation_Information: Originator: Petersen, E.I. Originator: Fusso, L.A. Originator: Emond, A.M. Originator: SkyTEM Canada Incorporated Originator: Aqua Geo Frameworks LLC Publication_Date: 2025 Title: Kuskokwim airborne electromagnetic survey, northern Kaiyuh Mountains, Alaska Series_Information: Series_Name: Geophysical Report Issue_Identification: GPR 2025-2 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 8 p Online_Linkage: https://doi.org/10.14509/31304 Cross_Reference: Citation_Information: Originator: Petersen, E.I. Originator: Fusso, L.A. Originator: Geotech Ltd. Originator: Aqua Geo Frameworks LLC Publication_Date: 2026 Title: Candle Hills airborne electromagnetic survey, Kuskokwim region, Alaska Series_Information: Series_Name: Geophysical Report Issue_Identification: GPR 2026-3 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 9 p Online_Linkage: https://doi.org/10.14509/31963 Cross_Reference: Citation_Information: Originator: Petersen, E.I. Originator: Fusso, L.A. Originator: Geotech Ltd. Originator: Aqua Geo Frameworks LLC Publication_Date: 2026 Title: Granite Mountain airborne electromagnetic survey, Kuskokwim Region, Alaska Series_Information: Series_Name: Geophysical Report Issue_Identification: GPR 2026-4 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 8 p Online_Linkage: https://doi.org/10.14509/31964 Data_Quality_Information: Attribute_Accuracy: Attribute_Accuracy_Report: 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. 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 - 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). 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: Terraquest LTD. 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: Terraquest LTD. 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: Terraquest LTD. 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: Terraquest LTD. 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: Terraquest LTD. 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: Alaska Division of Geological & Geophysical Surveys Contact_Position: Metadata Manager 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 (https://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 2026-5 Distribution_Liability: 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. 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: Contact DGGS for current pricing 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: 20260708 Format_Information_Content: Airborne electromagnetic geophysical survey data compilation Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: https://doi.org/10.14509/32087 Fees: Free download Metadata_Reference_Information: Metadata_Date: 20260708 Metadata_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: Alaska Division of Geological & Geophysical Surveys Contact_Person: Simone Montayne Contact_Position: Metadata Manager 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 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 the data in any way they are obligated to describe the types of modifications they have performed in the supporting metadata file. User specifically agrees not to imply that changes they made were approved by the Alaska Department of Natural Resources or Division of Geological & Geophysical Surveys. Metadata_Extensions: Online_Linkage: https://dggs.alaska.gov/metadata/dggs.ext Profile_Name: dggs metadata extensions