Identification_Information: Citation: Citation_Information: Originator: Petersen, E.I. Originator: Fusso, L.A. Originator: Emond, A.M. Originator: SkyTEM Canada Incorporated Originator: Aqua Geo Frameworks LLC Originator: Eichelberger, J.C. Publication_Date: 2025 Title: Pilgrim Hot Springs airborne electromagnetic survey, Seward Peninsula, Alaska Geospatial_Data_Presentation_Form: digital, data Series_Information: Series_Name: Geophysical Report Issue_Identification: GPR 2025-1 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 7 p Online_Linkage: https://doi.org/10.14509/31452 Description: Abstract: Pilgrim Hot Springs airborne electromagnetic survey, Seward Peninsula, Alaska, Geophysical Report 2025-1, covers a portion of the Southwest corner of the Bendeleben quadrangle, north-northeast of Nome, Alaska. The survey was conducted to characterize subsurface electrical resistivity variations, supporting interpretations of hydrothermal circulation, fluid pathways, and near-surface thaw zones. The resulting dataset provides insights into the geologic framework and supports geothermal exploration by enabling evaluation of subsurface conditions, identification of energy prospects, and guidance for future drilling. Time-domain electromagnetic data were acquired using the helicopter-mounted SkyTEM 306HP system on September 8-9, 2023, by SkyTEM Canada Incorporated. A total of 73.2 line-kilometers were flown over a single survey block measuring 10.7 square kilometers. The block was flown with north-south line orientation and a nominal spacing of 100 meters, reduced to 50 meters near the center. Mean ground clearance was 35.8 +/- 15.7 meters, with a nominal survey speed of 101.4 +/- 7.8 km/hr. Data were inverted using Aarhus Workbench EM software to produce two subsurface resistivity models. SkyTEM Canada Incorporated generated a preliminary model from a laterally constrained inversion (referred to in the data files as skytem_lci), which applies only along-track constraints. Aqua Geo Frameworks produced a spatially constrained inversion model (referred to in the data files as agf_sci), which incorporates both along-track and cross-track constraints. The Aqua Geo Frameworks model is recommended for end-users, as it resolves finer-scale structures, including layering in the near-surface thaw zone. We also provide a 3D voxel dataset registered to elevation rather than raw depth for the model. These data are provided as a Geophysical Report under an open end-user license and are available on the DGGS website https://doi.org/10.14509/31452. Purpose: The Pilgrim Hot Springs airborne electromagnetic survey was conducted to characterize subsurface electrical resistivity variations, providing critical information on hydrothermal circulation, fluid pathways, and near‑surface thaw zones. The resulting dataset strengthens Alaska's ability to evaluate geothermal resources by improving understanding of subsurface conditions and informing decisions about future drilling. These insights support long‑term energy planning, reduce exploration risk, and help advance locally available, low‑carbon energy options for Alaskan communities. 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_format: Printable and geographically registered maps in pdf format. Compatible with mobile device navigation and desktop mapping applications. >models_resistivity: Files for model input parameters as well as model outputs from Aarhus Workbench. Images of resistivity sections >vector_data: Line path and survey boundary in Esri shapefile (shp) format Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 2025 Currentness_Reference: ground condition Status: Progress: Complete Maintenance_and_Update_Frequency: None planned Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -164.954182 East_Bounding_Coordinate: -164.903457 North_Bounding_Coordinate: 65.109621 South_Bounding_Coordinate: 65.016508 Keywords: Theme: Theme_Keyword_Thesaurus: ISO 19115 Topic Category Theme_Keyword: geoscientificInformation Theme: Theme_Keyword_Thesaurus: Alaska Division of Geological & Geophysical Surveys Theme_Keyword: Airborne Geophysical Survey Theme_Keyword: Analytic Signal Theme_Keyword: Apparent Resistivity Contours Theme_Keyword: Apparent Resistivity Data Theme_Keyword: Apparent Resistivity Map Theme_Keyword: Apparent Resistivity Survey Theme_Keyword: Bedrock Geology Theme_Keyword: Conductivity Survey Theme_Keyword: DGGS Theme_Keyword: Economic Geology Theme_Keyword: Economic Study Theme_Keyword: Electromagnetic Anomalies Theme_Keyword: Electromagnetic Data Theme_Keyword: Electromagnetic Data Inversion Theme_Keyword: Electromagnetic Survey Theme_Keyword: Energy Theme_Keyword: Energy Resources Theme_Keyword: Engineering Geology Theme_Keyword: Exploration Theme_Keyword: Geobarometry Theme_Keyword: Geology Theme_Keyword: Geophysical Map Theme_Keyword: Geophysical Survey Theme_Keyword: Geophysics Theme_Keyword: Geophysics Search Tag Theme_Keyword: Geothermal Theme_Keyword: Geothermometry Theme_Keyword: Helicopter Survey Theme_Keyword: HEM Survey Theme_Keyword: Hydrology Theme_Keyword: Hydrothermal Deposits Theme_Keyword: Remote Sensing Theme_Keyword: Resistivity Theme_Keyword: Resistivity Model Theme_Keyword: Resistivity Survey Place: Place_Keyword_Thesaurus: Alaska Division of Geological & Geophysical Surveys Place_Keyword: Kougarok Mining District Place_Keyword: Paystreak Creek Place_Keyword: Pilgrim River Place_Keyword: Pilgrim Springs Place_Keyword: Seward Peninsula 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 supported by the State of Alaska capital improvement project funds. DGGS thanks the United States Geological Survey for assistance with data quality control. 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: DGGS Staff Publication_Date: 2019 Title: Geothermal Resources of Alaska Series_Information: Series_Name: Digital Data Series Issue_Identification: DDS 16 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Online_Linkage: https://doi.org/10.14509/30225 Cross_Reference: Citation_Information: Originator: Emond, A.M. Originator: Daanen, R.P. Publication_Date: 2020 Title: Pilgrim Hot Springs CSAMT measurements, Seward Peninsula, Alaska Series_Information: Series_Name: Raw Data File Issue_Identification: RDF 2020-9 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 5 p Online_Linkage: https://doi.org/10.14509/30472 Cross_Reference: Citation_Information: Originator: Motyka, R.J. Originator: Moorman, M.A. Originator: Liss, S.A. Publication_Date: 1983 Title: Geothermal resources of Alaska Series_Information: Series_Name: Miscellaneous Publication Issue_Identification: MP 8 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 1 sheet, scale 1:2,500,000 Online_Linkage: https://doi.org/10.14509/671 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 - SkyTEM Canada Incorporated acquired time‑domain electromagnetic data using the helicopter‑mounted SkyTEM 306HP system on September 8-9, 2023, flying 73.2 line‑kilometers over a single 10.7‑square‑kilometer survey block. The crew flew the block along north-south lines with a nominal spacing of 100 meters, tightening the spacing to 50 meters near the center. They maintained a mean ground clearance of 35.8 +/- 15.7 meters and a nominal survey speed of 101.4 +/- 7.8 km/hr. DGGS contractors used Aarhus Workbench EM software to invert the data and generate two subsurface resistivity models. SkyTEM Canada Incorporated produced a preliminary model using a laterally constrained inversion (skytem_lci), which applies only along‑track constraints. Aqua Geo Frameworks generated a spatially constrained inversion model (agf_sci) that incorporates both along‑track and cross‑track constraints. Process_Date: 2025 Process_Step: Process_Description: Data cataloged for archival and publication - Final data were published and archived by DGGS. Process_Date: 2025 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: 3 Transverse_Mercator: Scale_Factor_at_Central_Meridian: 0.999600 Longitude_of_Central_Meridian: -165 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: SkyTEM Canada Incorporated and Aqua Geo Frameworks LLC 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: SkyTEM Canada Incorporated and Aqua Geo Frameworks LLC 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: SkyTEM Canada Incorporated and Aqua Geo Frameworks LLC 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: SkyTEM Canada Incorporated and Aqua Geo Frameworks LLC 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_format Entity_Type_Definition: Printable and geographically registered maps in pdf format. Compatible with mobile device navigation and desktop mapping applications. Entity_Type_Definition_Source: SkyTEM Canada Incorporated and Aqua Geo Frameworks LLC Entity_Attribute_Layer_Name: maps_pdf_format Detailed_Description: Entity_Type: Entity_Type_Label: models_resistivity Entity_Type_Definition: Files for model input parameters as well as model outputs from Aarhus Workbench. Images of resistivity sections Entity_Type_Definition_Source: SkyTEM Canada Incorporated and Aqua Geo Frameworks LLC Entity_Attribute_Layer_Name: models_resistivity 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 2025-1 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/10.14509/31452 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: 20251218 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/10.14509/31452 Fees: Free download Metadata_Reference_Information: Metadata_Date: 20251218 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