Fusso, L.A.Petersen, E.I.Terraquest LTD.2026digital, dataGeophysical ReportGPR 2026-5Fairbanks, Alaska, United StatesAlaska Division of Geological & Geophysical Surveys17 p.https://doi.org/10.14509/32087Aniak 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.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.>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) format20252026ground conditionCompleteNone planned-160.098112-156.69482061.69317260.651119ISO 19115 Topic CategorygeoscientificInformationAlaska Division of Geological & Geophysical SurveysAeromagneticAeromagnetic DataAeromagnetic MapAeromagnetic SurveyAirborne Geophysical SurveyAnalytic SignalBedrock GeologyCritical MineralsDGGSEarth MRIEconomic GeologyExplorationFixed Wing SurveyGeologyGeophysical MapGeophysical SurveyGeophysicsGeophysics Search TagGridded DataMagnetic ContoursMagnetic DataMagnetic SurveyMagnetic SusceptibilityMagneticsMineral AssessmentMineral Deposit ModelsMineral DevelopmentMineral ExplorationMineral ResourcesMineralsPlutonic HostedPlutonic RocksPlutonsRadiometric SurveyRadiometricsRemote SensingAlaska Division of Geological & Geophysical SurveysAghaluk CreekAniakAniak Mining DistrictAniak RiverBairo CreekBeaver CreekBristol Bay Region Mining DistrictBuckstock RiverChichitnok RiverChicken CreekChikululnuk CreekChuathbalukChukowan RiverCinnabar CreekCrow VillageDiscovery CreekDoestock CreekEnatalik CreekFork CreekGemuk RiverGibralter PointHolitna RiverHolokuk RiverIditarod Mining DistrictKashegelokKiknik CreekKipchuk RiverKogoyuk CreekKogrukluk RiverKolmakofKolmakof LakeKolmakof RiverKuskokwim RiverLittle Taylor MountainsMission CreekNapaimiutNew York CreekNushagak HillsOksotalik CreekOphir CreekOwhat RiverPearl CreekPioneer CreekPolly CreekSalmon RiverSawpit CreekShotgun CreekSuter CreekSwift CreekSwift RiverTabasco CreekTaylor CreekTaylor Mountains MineTimber CreekTitnuk CreekTitnum CreekVeahna CreekVictoria CreekWhitefish LakeWhitewater CreekThis 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).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.Alaska Division of Geological & Geophysical SurveysMetadata Managermailing and physical

3354 College Road

FairbanksAK99709-3707USA(907)451-5020(907)451-5050dggspubs@alaska.gov8 am to 4:30 pm, Monday through Friday, except State holidaysPlease 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.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.Emond, A.M.MPX Geophysics LTD2023Geophysical ReportGPR 2023-1Fairbanks, Alaska, United StatesAlaska Division of Geological & Geophysical Surveys4 phttps://doi.org/10.14509/31087Emond, A.M.Fusso, L.A.Geotech Ltd.2024Geophysical ReportGPR 2024-1Fairbanks, Alaska, United StatesAlaska Division of Geological & Geophysical Surveys4 phttps://doi.org/10.14509/31094Fusso, L.A.Petersen, E.I.New Resolution Geophysics, USA2025Geophysical ReportGPR 2025-5Fairbanks, Alaska, United StatesAlaska Division of Geological & Geophysical Surveys18 phttps://doi.org/10.14509/31724Fusso, L.A.Petersen, E.I.Emond, A.M.EON Geosciences Inc.2025Geophysical ReportGPR 2025-3Fairbanks, Alaska, United StatesAlaska Division of Geological & Geophysical Surveys18 phttps://doi.org/10.14509/31493Fusso, L.A.Petersen, E.I.Emond, A.M.EON Geosciences Inc.2026Geophysical ReportGPR 2026-1Fairbanks, Alaska, United StatesAlaska Division of Geological & Geophysical Surveys16 phttps://doi.org/10.14509/31746Fusso, L.A.Petersen, E.I.Emond, A.M.EON Geosciences Inc.2026Geophysical ReportGPR 2026-2Fairbanks, Alaska, United StatesAlaska Division of Geological & Geophysical Surveys17 phttps://doi.org/10.14509/31804Petersen, E.I.Fusso, L.A.Emond, A.M.SkyTEM Canada IncorporatedAqua Geo Frameworks LLC2025Geophysical ReportGPR 2025-2Fairbanks, Alaska, United StatesAlaska Division of Geological & Geophysical Surveys8 phttps://doi.org/10.14509/31304Petersen, E.I.Fusso, L.A.Geotech Ltd.Aqua Geo Frameworks LLC2026Geophysical ReportGPR 2026-3Fairbanks, Alaska, United StatesAlaska Division of Geological & Geophysical Surveys9 phttps://doi.org/10.14509/31963Petersen, E.I.Fusso, L.A.Geotech Ltd.Aqua Geo Frameworks LLC2026Geophysical ReportGPR 2026-4Fairbanks, Alaska, United StatesAlaska Division of Geological & Geophysical Surveys8 phttps://doi.org/10.14509/31964GeophysiScal 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.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.The dataset provides processed geophysical and positional data for the entire survey extent.Station coordinates were positioned using a real-time or post-processed corrected differential GPS.Not applicableData 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).2025Data cataloged for archival and publication - Final data were published and archived by DGGS.2026rasterUniversal Transverse Mercator40.999600-1590500000.0000000coordinate pair.00000001.00000001MetersWGS84WGS 846378137298.257223563ascii_dataASCII format line data, other ASCII dataTerraquest LTD.ascii_datadatabases_geosoftGeosoft format database of final line data, other Geosoft format databasesTerraquest LTD.databases_geosoftdocumentsProject report, calibration reportsTerraquest LTD. and Alaska Division of Geological & Geophysical Surveys (DGGS)documentsgrids_geosoftOasis montaj Geosoft GRD format gridded dataTerraquest LTD. and Alaska Division of Geological & Geophysical Surveys (DGGS)grids_geosoftgrids_tifGeographically registered data value rasters of gridded data, GeoTiff formatAlaska Division of Geological & Geophysical Surveys (DGGS)grids_tifkmzKeyhole Markup Language (KML) kmz archive files of project data. Viewable on Google Earth and other compatible programsAlaska Division of Geological & Geophysical Surveys (DGGS)kmzmaps_pdfPrintable and geographically registered maps in pdf format.Terraquest LTD.maps_pdfvector_dataLine path and survey boundary in Esri shapefile (shp) formatAlaska Division of Geological & Geophysical Surveys (DGGS)vector_dataAlaska Division of Geological & Geophysical SurveysMetadata Managermailing and physical

3354 College Road

FairbanksAK99709-3707USA(907)451-5020(907)451-5050dggspubs@alaska.gov8 am to 4:30 pm, Monday through Friday, except State holidaysPlease 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.GPR 2026-5The 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.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.Contact DGGS for current pricingGeoTiff, 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.20260708Airborne electromagnetic geophysical survey data compilationhttps://doi.org/10.14509/32087Free download20260708Alaska Division of Geological & Geophysical SurveysSimone MontayneMetadata Managermailing and physical

3354 College Road

FairbanksAK99709-3707USA(907)451-5020(907)451-5050dggspubs@alaska.gov8 am to 4:30 pm, Monday through Friday, except State holidaysFGDC Content Standard for Digital Geospatial MetadataFGDC-STD-001-1998If 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.https://dggs.alaska.gov/metadata/dggs.extdggs metadata extensions