Identification_Information: Citation: Citation_Information: Originator: Fusso, L.A. Originator: Petersen, E.I. Originator: Emond, A.M. Originator: EON Geosciences Inc. Publication_Date: 2025 Title: Tofty airborne magnetic and radiometric survey, Alaska Geospatial_Data_Presentation_Form: digital, data Series_Information: Series_Name: Geophysical Report Issue_Identification: GPR 2025-4 V. 2 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/10.14509/31683 Description: Abstract: Tofty airborne magnetic and radiometric survey, Alaska, Geophysical Report 2025-4 V. 2, covers parts of the Tanana Quadrangle west of Fairbanks, Alaska. Magnetic and radiometric data were collected with a helicopter between August 25 and 30, 2024, by EON Geosciences Inc. The survey contains a single block covering 298 km2. A total of 2,178 line-kilometers were collected. The magnetometer was installed inside the stinger attached to the helicopter nose. The airborne gamma-ray spectrometer was mounted on the interior floor of the helicopter cabin. The block was flown with a line spacing of 200 m; the northeastern portion of the block was flown with a 100 m spacing. Tie-lines for magnetic leveling were flown at 1,200 m spacing. The data, as well as additional metadata, are available from the DGGS website: http://doi.org/10.14509/31683. Purpose: The data from the Tofty airborne magnetic and radiometric survey, Alaska, will be used for improving the understanding of the region's geology and mineral potential and to promote resource exploration. This survey is part of the continuous regional magnetic data coverage of Alaska. 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 and other supporting files >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 in 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. >vector_data: Line path and survey boundary in ESRI shapefile (SHP) format Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 2024 Currentness_Reference: ground condition Status: Progress: Complete Maintenance_and_Update_Frequency: None planned Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -151.346583 East_Bounding_Coordinate: -150.437103 North_Bounding_Coordinate: 65.192172 South_Bounding_Coordinate: 64.995235 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: DGGS Theme_Keyword: Earth MRI Theme_Keyword: Exploration Theme_Keyword: Geologic 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: Line Data Theme_Keyword: Magnetic Data Theme_Keyword: Magnetic Survey Theme_Keyword: Magnetics Theme_Keyword: Radiometrics Theme_Keyword: Remote Sensing Place: Place_Keyword_Thesaurus: Alaska Division of Geological & Geophysical Surveys Place_Keyword: American Creek Place_Keyword: Baker Creek Place_Keyword: Blowback Creek Place_Keyword: Cache Creek Place_Keyword: Camp Creek Place_Keyword: Colorado Creek Place_Keyword: Cooney Creek Place_Keyword: Deep Creek Place_Keyword: Deep Creek Lakes Place_Keyword: Dome Creek Place_Keyword: Eldorado Creek Place_Keyword: Fish Lake Place_Keyword: Gold Basin Creek Place_Keyword: Hot Springs Mining District Place_Keyword: Killarney Creek Place_Keyword: New York Creek Place_Keyword: Quartz Creek Place_Keyword: Ready Money Creek Place_Keyword: Sullivan Creek Place_Keyword: Tamarack Creek Place_Keyword: Tofty Place_Keyword: Tonawanda Creek Place_Keyword: Utah Creek Place_Keyword: Woodchopper 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 supported by State of Alaska capital improvement project funds; additional funding was provided by AK USA Critical Metals Inc. 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: 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 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 originate from one company using DGGS contract specifications for all data (see accompanying project report). The originating coordinate system was retained for all publication products. Completeness_Report: This data set includes files that contain processed aeromagnetic measurements, radiometric measurements, magnetic measurements, altimetry measurements, and locational data for the entire survey area. 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 collection, processing, and delivery - The airborne geophysical data were acquired under contract with EON Geosciences Inc.. Magnetic and radiometric data were collected with a helicopter between August 25 and 30, 2024, by EON Geosciences Inc. The survey contains a single block covering 298 km2. A total of 2,178 line-kilometers were collected. The magnetometer was installed inside the stinger attached to the helicopter nose. The airborne gamma-ray spectrometer was mounted on the interior floor of the helicopter cabin. The block was flown with a line spacing of 200 m; the northeastern portion of the block was flown with a 100 m spacing. Tie-lines for magnetic leveling were flown at 1,200 m spacing. Process_Date: 2024 Process_Step: Process_Description: Data cataloged for archival and publication - Final data were published and archived by DGGS. Process_Date: 2024 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: 5 Transverse_Mercator: Scale_Factor_at_Central_Meridian: 0.999600 Longitude_of_Central_Meridian: -153 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 and other supporting files Entity_Type_Definition_Source: EON Geosciences Inc. and 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 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: 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 in Google Earth and other compatible programs Entity_Type_Definition_Source: 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: EON Geosciences Inc. Entity_Attribute_Layer_Name: maps_pdf_format 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: 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 2025-4 V. 2 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: 20250701 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/10.14509/31683 Fees: Free download Metadata_Reference_Information: Metadata_Date: 20250701 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