Identification_Information: Citation: Citation_Information: Originator: Burns, L.E. Originator: Barefoot, J.D. Originator: Woods, Rebecca-Ellen Originator: WGM Mining and Geological Consultants, Inc. Originator: Dighem Surveys and Processing Publication_Date: 2019 Title: Circle electromagnetic and magnetic airborne geophysical survey data compilation Geospatial_Data_Presentation_Form: digital data Series_Information: Series_Name: Geophysical Report Issue_Identification: GPR 2019-3 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 4 p. Online_Linkage: http://doi.org/10.14509/30167 Description: Abstract: This geophysical survey is located in north-central Alaska in the Circle mining district, about 120 kilometers northeast of Fairbanks, Alaska. Frequency domain electromagnetic and magnetic data were collected with the DIGHEM system from August to September 1993. A total of 2516.7 line kilometers were collected covering 921.5 square kilometers. Line spacing was 400 meters (m). Data were collected 30 m above the ground surface from a helicopter towed sensor platform ("bird") on a 30 m long line. The data, as well as additional metadata, are available from the DGGS website: http://doi.org/10.14509/30167. Purpose: This airborne geophysical survey is part of a program to acquire data on Alaska's most promising mineral belts and districts. The information acquired is aimed at catalyzing new private sector exploration, discovery, and ultimate development and production. The purpose of the survey was to map the magnetic and conductive properties of the survey area. The Circle Mining District has historically been a placer district, and these surveys are aimed at locating possible bedrock sources. Mineral prospects in the survey area include Top Dollar and 88 Group. Other gold and base-metal anomalies, altered zones, favorable lithologies, and structural zones are known to exist throughout the survey area. Supplemental_Information: >ascii_data: ASCII format line data, other ASCII data >databases_geosoft: Geosoft format database of line data, other Geosoft format databases >documents: Project and field reports, survey background information, gridded data explanations, other supporting documentation >grids_ermapper: Geographically registered gridded data, ER Mapper ERS format >grids_geosoft: Geosoft-format binary grids, these grids can be viewed in ESRI ArcMap using a free plugin from Geosoft >images_registered: GeoTiff format images of all gridded data >kmz: keyhole markup language (kml) kmz archive files of project data. Viewable in Google Earth and other compatible programs >maps_pdf_format: Printable maps in pdf format >maps_prn_format: Printable maps in HPGL/2 printer file format with extension .prn >profiles_stacked: Distance-based profiles of the digitally recorded geophysical data are generated and plotted at an appropriate scale. The profiles display electromagnetic anomalies with their respective interpretive symbols >vector_data: Line path, data contours, and survey boundary in ESRI shapefile (SHP) format, ESRI Geodatabase format, and/or AutoCAD dxf format >video_flightpath: Survey flight path downward-facing video Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1993 Currentness_Reference: ground condition Status: Progress: complete Maintenance_and_Update_Frequency: None planned Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -145.591778 East_Bounding_Coordinate: -144.517385 North_Bounding_Coordinate: 65.590254 South_Bounding_Coordinate: 65.365742 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: Apparent Resistivity Data Theme_Keyword: Apparent Resistivity Map Theme_Keyword: Apparent Resistivity Survey Theme_Keyword: Conductivity Survey Theme_Keyword: Electromagnetic Data Theme_Keyword: Electromagnetic Survey Theme_Keyword: Exploration Theme_Keyword: First Vertical Derivative Theme_Keyword: Frequency Domain Electromagnetic Data 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: Mastodon Theme_Keyword: Remote Sensing Theme_Keyword: Resistivity Theme_Keyword: Resistivity Survey Place: Place_Keyword_Thesaurus: Alaska Division of Geological & Geophysical Surveys Place_Keyword: Bates Creek Place_Keyword: Bedrock Creek Place_Keyword: Birch Creek Place_Keyword: Bonanza Creek Place_Keyword: Bottom Dollar Creek Place_Keyword: Boulder Creek Place_Keyword: Butte Creek Place_Keyword: Circle Hot Springs Place_Keyword: Cripple Creek Place_Keyword: Crooked Creek Place_Keyword: Deadwood Place_Keyword: Deadwood Creek Place_Keyword: Dome Creek Place_Keyword: Eagle Creek Place_Keyword: Eagle Summit Place_Keyword: Easley Creek Place_Keyword: Fish Creek Place_Keyword: Gold Dust Creek Place_Keyword: Graveyard Creek Place_Keyword: Greenhorn Creek Place_Keyword: Half Dollar Creek Place_Keyword: Harrison Creek Place_Keyword: Harrison Fork Place_Keyword: Holdem Creek Place_Keyword: Hot Springs Creek Place_Keyword: Independence Creek Place_Keyword: Ketchem Creek Place_Keyword: Ketchem Dome Place_Keyword: Mammoth Creek Place_Keyword: Mary Louise Fork Place_Keyword: Mastodon Creek Place_Keyword: Mastodon Dome Place_Keyword: Mastodon Fork Place_Keyword: Mastodon Fork Eagle Creek Place_Keyword: Miller Creek Place_Keyword: Miller Fork Place_Keyword: Miller Fork Eagle Creek Place_Keyword: Miller House Place_Keyword: North Fork Harrison Creek Place_Keyword: Pinnell Trail Place_Keyword: Porcupine Creek Place_Keyword: Porcupine Dome Place_Keyword: Portage Creek Place_Keyword: Ptarmigan Creek Place_Keyword: Sawpit Creek Place_Keyword: Slate Creek Place_Keyword: South Fork Harrison Creek Place_Keyword: Squaw Creek Place_Keyword: Switch Creek Place_Keyword: Traverse Creek Place_Keyword: Two-Bit Creek Place_Keyword: Yankee 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 Data_Set_Credit: Funding was provided by the Alaska State Legislature as part of the DGGS Airborne Geophysical/Geological Mineral Inventory (AGGMI) program. Cross_Reference: Citation_Information: Originator: DGGS Staff Publication_Date: 2014 Title: Airborne GeophysWeb: A compilation of geophysical data from DGGS and cooperating agencies Series_Information: Series_Name: Digital Data Series Issue_Identification: DDS 2 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Online_Linkage: http://doi.org/10.14509/27222 Cross_Reference: Citation_Information: Originator: DGGS Staff Publication_Date: 2016 Title: Alaska merged geophysical data grids Series_Information: Series_Name: Digital Data Series Issue_Identification: DDS 12 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 1 DVD Online_Linkage: http://doi.org/10.14509/29555 Data_Quality_Information: Attribute_Accuracy: Attribute_Accuracy_Report: Geophysical data were acquired according to 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 the same contract specifications for all data. The originating coordinate system was retained for all publication products. Completeness_Report: This data set includes files that contain processed aeromagnetic measurements, electromagnetic measurements, altimetry measurements, and locational data for the entire survey area. Positional_Accuracy: Horizontal_Positional_Accuracy: Horizontal_Positional_Accuracy_Report: These data are positioned with post-processed differential GPS. Vertical_Positional_Accuracy: Vertical_Positional_Accuracy_Report: These data are positioned with post-processed differential GPS. Lineage: Source_Information: Source_Citation: Citation_Information: Originator: Alaska Division of Geological & Geophysical Surveys Originator: WGM, Inc. Originator: Dighem Publication_Date: 1994 Title: 7200 Hz resistivity contours of Circle mining district Series_Information: Series_Name: Public Data File Issue_Identification: PDF 94-12 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 1 sheet, scale 1:63,360 Online_Linkage: http://doi.org/10.14509/1637 Source_Scale_Denominator: 63360 Type_of_Source_Media: paper Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1994 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: Alaska Division of Geological & Geophysical Surveys and others, 1994 Source_Contribution: Data collection, processing, and delivery Source_Information: Source_Citation: Citation_Information: Originator: Alaska Division of Geological & Geophysical Surveys Originator: WGM, Inc. Originator: Dighem Publication_Date: 1994 Title: 900 Hz resistivity contours of Circle mining district Series_Information: Series_Name: Public Data File Issue_Identification: PDF 94-11 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 1 sheet, scale 1:63,360 Online_Linkage: http://doi.org/10.14509/1636 Source_Scale_Denominator: 63360 Type_of_Source_Media: paper Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1994 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: Alaska Division of Geological & Geophysical Surveys and others, 1994 Source_Contribution: Data collection, processing, and delivery Source_Information: Source_Citation: Citation_Information: Originator: Alaska Division of Geological & Geophysical Surveys Originator: WGM, Inc. Originator: Dighem Publication_Date: 1994 Title: Clear mylar version of RI 94-2: Total field magnetics and electromagnetic anomalies of the Circle mining district Series_Information: Series_Name: Public Data File Issue_Identification: PDF 94-14 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 1 sheet, scale 1:63,360 Online_Linkage: http://doi.org/10.14509/1639 Source_Scale_Denominator: 63360 Type_of_Source_Media: paper Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1994 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: Alaska Division of Geological & Geophysical Surveys and others, 1994 Source_Contribution: Data collection, processing, and delivery Source_Information: Source_Citation: Citation_Information: Originator: Alaska Division of Geological & Geophysical Surveys Originator: WGM, Inc. Originator: Dighem Publication_Date: 1994 Title: Flight lines of Circle mining district Series_Information: Series_Name: Public Data File Issue_Identification: PDF 94-10 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 1 sheet, scale 1:63,360 Online_Linkage: http://doi.org/10.14509/1635 Source_Scale_Denominator: 63360 Type_of_Source_Media: paper Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1994 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: Alaska Division of Geological & Geophysical Surveys and others, 1994 Source_Contribution: Data collection, processing, and delivery Source_Information: Source_Citation: Citation_Information: Originator: Alaska Division of Geological & Geophysical Surveys Originator: WGM, Inc. Publication_Date: 1994 Title: Filtered total field VLF contours of Circle mining district Series_Information: Series_Name: Public Data File Issue_Identification: PDF 94-13 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 1 sheet, scale 1:63,360 Online_Linkage: http://doi.org/10.14509/1638 Source_Scale_Denominator: 63360 Type_of_Source_Media: paper Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1994 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: Alaska Division of Geological & Geophysical Surveys and WGM, Inc., 1994 Source_Contribution: Data collection, processing, and delivery Source_Information: Source_Citation: Citation_Information: Originator: Burns, L.E. Originator: Fugro Airborne Surveys Corp. Originator: Stevens Exploration Management Corp. Publication_Date: 2004 Title: Line, gridded, and vector data, and selected plot files of the airborne geophysical survey data of the Circle mining district, central Alaska Series_Information: Series_Name: Geophysical Report Issue_Identification: GPR 2004-5 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 1 DVD Online_Linkage: http://doi.org/10.14509/3339 Type_of_Source_Media: paper Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 2004 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: Burns, L.E. and others, 2004 Source_Contribution: Data collection, processing, and delivery Source_Information: Source_Citation: Citation_Information: Originator: DGGS Staff Originator: Dighem Originator: WGM, Inc. Publication_Date: 1994 Title: CD-ROM digital archive files of 1993 survey data for Nome, Circle, Nyac, and Valdez Creek mining districts Series_Information: Series_Name: Public Data File Issue_Identification: PDF 94-15 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 22 p., 1 DVD Online_Linkage: http://doi.org/10.14509/1640 Type_of_Source_Media: paper Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1994 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: DGGS Staff and others, 1994 Source_Contribution: Data collection, processing, and delivery Source_Information: Source_Citation: Citation_Information: Originator: DGGS Staff Originator: WGM, Inc. Originator: Dighem Publication_Date: 1994 Title: 7200 Hz coplanar resistivity of the Circle mining district Series_Information: Series_Name: Report of Investigation Issue_Identification: RI 94-16 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 1 sheet, scale 1:63,360 Online_Linkage: http://doi.org/10.14509/2502 Source_Scale_Denominator: 63360 Type_of_Source_Media: paper Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1994 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: DGGS Staff and others, 1994 Source_Contribution: Data collection, processing, and delivery Source_Information: Source_Citation: Citation_Information: Originator: DGGS Staff Originator: WGM, Inc. Originator: Dighem Publication_Date: 1994 Title: 900 Hz coplanar resistivity of the Circle mining district Series_Information: Series_Name: Report of Investigation Issue_Identification: RI 94-17 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 1 sheet, scale 1:63,360 Online_Linkage: http://doi.org/10.14509/2503 Source_Scale_Denominator: 63360 Type_of_Source_Media: paper Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1994 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: DGGS Staff and others, 1994 Source_Contribution: Data collection, processing, and delivery Source_Information: Source_Citation: Citation_Information: Originator: DGGS Staff Originator: WGM, Inc. Originator: Dighem Publication_Date: 1994 Title: Color shadow total field magnetics of the Circle mining district Series_Information: Series_Name: Report of Investigation Issue_Identification: RI 94-15 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 1 sheet, scale 1:63,360 Online_Linkage: http://doi.org/10.14509/2501 Source_Scale_Denominator: 63360 Type_of_Source_Media: paper Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1994 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: DGGS Staff and others, 1994 Source_Contribution: Data collection, processing, and delivery Source_Information: Source_Citation: Citation_Information: Originator: DGGS Staff Originator: WGM, Inc. Originator: Dighem Publication_Date: 1994 Title: Digital gridded data of total field magnetics and electromagnetics for entire survey of Circle mining district Series_Information: Series_Name: Public Data File Issue_Identification: PDF 94-33 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 1 DVD Online_Linkage: http://doi.org/10.14509/1659 Type_of_Source_Media: paper Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1994 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: DGGS Staff and others, 1994 Source_Contribution: Data collection, processing, and delivery Source_Information: Source_Citation: Citation_Information: Originator: DGGS Staff Originator: WGM, Inc. Originator: Dighem Publication_Date: 1994 Title: Total field magnetics and electromagnetic anomalies of the Circle mining district Series_Information: Series_Name: Report of Investigation Issue_Identification: RI 94-2 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 1 sheet, scale 1:63,360 Online_Linkage: http://doi.org/10.14509/2488 Source_Scale_Denominator: 63360 Type_of_Source_Media: paper Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1994 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: DGGS Staff and others, 1994 Source_Contribution: Data collection, processing, and delivery Source_Information: Source_Citation: Citation_Information: Originator: DGGS Staff Originator: WGM, Inc. Originator: Dighem Publication_Date: 1994 Title: Total field magnetics of the Circle mining district Series_Information: Series_Name: Report of Investigation Issue_Identification: RI 94-14 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 1 sheet, scale 1:63,360 Online_Linkage: http://doi.org/10.14509/2500 Source_Scale_Denominator: 63360 Type_of_Source_Media: paper Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1994 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: DGGS Staff and others, 1994 Source_Contribution: Data collection, processing, and delivery Source_Information: Source_Citation: Citation_Information: Originator: McConnell, D.L. Publication_Date: 1994 Title: Final summary of 1993 airborne geophysical surveys of the Nome, Circle, Nyac, and Valdez Creek areas Series_Information: Series_Name: Public Data File Issue_Identification: PDF 94-36 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 327 p., 4 sheets, scale 1:63,360 Online_Linkage: http://doi.org/10.14509/1662 Source_Scale_Denominator: 63360 Type_of_Source_Media: paper Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1994 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: McConnell, D.L., 1994 Source_Contribution: Data collection, processing, and delivery Process_Step: Process_Description: Data collection, processing, and delivery - Data collection, processing, and delivery - The airborne geophysical data were acquired under a contract with WGM Mining and Geological Consultants, Inc. and Dighem Surveys and Processing. The contractor's project report and other supporting documents are in the "documents" digital data package. They provide detailed documentation of the system specifications, data collection, processing, and delivery. Source_Used_Citation_Abbreviation: Alaska Division of Geological & Geophysical Surveys and others, 1994 Source_Used_Citation_Abbreviation: Alaska Division of Geological & Geophysical Surveys and others, 1994 Source_Used_Citation_Abbreviation: Alaska Division of Geological & Geophysical Surveys and others, 1994 Source_Used_Citation_Abbreviation: Alaska Division of Geological & Geophysical Surveys and others, 1994 Source_Used_Citation_Abbreviation: Alaska Division of Geological & Geophysical Surveys and WGM, Inc., 1994 Source_Used_Citation_Abbreviation: Burns, L.E. and others, 2004 Source_Used_Citation_Abbreviation: DGGS Staff and others, 1994 Source_Used_Citation_Abbreviation: DGGS Staff and others, 1994 Source_Used_Citation_Abbreviation: DGGS Staff and others, 1994 Source_Used_Citation_Abbreviation: DGGS Staff and others, 1994 Source_Used_Citation_Abbreviation: DGGS Staff and others, 1994 Source_Used_Citation_Abbreviation: DGGS Staff and others, 1994 Source_Used_Citation_Abbreviation: DGGS Staff and others, 1994 Source_Used_Citation_Abbreviation: McConnell, D.L., 1994 Process_Date: 1993 Process_Step: Process_Description: Reformatting - Digital data collected in 1993 were reformatted by Fugro Airborne Surveys Corp. for ease of use with modern processing tools, vector files were added, and new color maps were produced. No reprocessing was done. Process_Date: 2004 Process_Step: Process_Description: Grid development - MAG, RES900, RES7200, and RES56K grids delivered by the contractor were mislocated geographically. These grids were re-generated by loading line data in Geosoft Oasis Montaj v9. Channels MAG, RES900, RES7200, and RES56K were gridded using the Minimum Curvature option with the following settings: grid cell size = 80, blanking distance = 800, cells to extend beyond data = 1. The newly generated sim_magtf grid is not the same as the grid on circle_sim_magtf_topo_map.pdf. The grid on the pdf maps has a third order trend removed. Process_Date: 2019 Process_Step: Process_Description: Analytic signal grid - The analytic signal grid was generated by using the analytic signal function in Geosoft Oasis Montaj v9 on 100m upward continued simulated total magnetic field grid. The calculated first vertical derivative grid was created during the analytic signal process. The derivatives in the analytic signal calculation were computed using a fast Fourier transform (FFT) based 2D filter. Process_Date: 2019 Process_Step: Process_Description: RGB GeoTiff creation - RGB GeoTIFF raster files of gridded data were exported using Geosoft v9 by loading each Geosoft grid onto a map and using the map export tool. Process_Date: 2019 Process_Step: Process_Description: DXF conversion and geographic referencing - Contractor provided AutoCAD DXF files were converted to an ESRI Geodatabase in ArcMap v10 using the CAD to Geodatabase tool. Process_Date: 2019 Process_Step: Process_Description: Standard Boundary Polygon - The final boundary polygon was generated by loading the line data in Geosoft Oasis Montaj v9. The channel MAG was gridded using the Minimum Curvature option with the following settings: grid cell size = 25, blanking distance = 800, cells to extend beyond data = 2. The polygon file was created using Grid Outline tool with edge resolution = 1. The polygon file was exported to ESRI shapefile. Process_Date: 2019 Process_Step: Process_Description: Keyhole markup language (kml) KMZ archive creation - Data were exported from Geosoft and ESRI ArcMap to kml format files and/or KMZ archives. These files were then combined and modified in Google Earth Pro to create the final KMZ file. Process_Date: 2019 Process_Step: Process_Description: Simulated Magnetic Total Field - In this publication's older products and documentation the magnetic data products have been referred to as Total Field Magnetics on the maps and the MAG channel in the line data and 'mag' as a filename abbreviation. The new term 'sim_magtf' has been created to rename and clarify that the data are not representative of the true total magnetic field as the IGRF values have been removed with a single average value added back to the entire dataset, resulting in the IGRF gradient being removed. The term simulated magnetic total field and the filename abbreviation 'sim_magtf' is now used to identify these magnetic data. Process_Date: 2019 Process_Step: Process_Description: Data cataloged for archival and publication - All files were renamed and placed in a standardized set of folders according to the DGGS Geophysics Data Management Manual. Where applicable and as needed data were converted to newer file formats and new files were created. Supporting documentation including but not limited to readme text files, maps, figures, survey overview report, missing data type explanations, and metadata were created. Process_Date: 2019 Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Planar: Grid_Coordinate_System: Grid_Coordinate_System_Name: Universal Transverse Mercator Universal_Transverse_Mercator: UTM_Zone_Number: 6 Transverse_Mercator: Scale_Factor_at_Central_Meridian: 0.999600 Longitude_of_Central_Meridian: -147 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: North American Datum of 1927 Ellipsoid_Name: Clarke 1866 Semi-major_Axis: 6378206.40000000037 Denominator_of_Flattening_Ratio: 294.978698199999997 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: WGM Mining and Geological Consultants, Inc. and Dighem Surveys and Processing Entity_Attribute_Layer_Name: ascii_data Detailed_Description: Entity_Type: Entity_Type_Label: databases_geosoft Entity_Type_Definition: Geosoft format database of line data, other Geosoft format databases Entity_Type_Definition_Source: WGM Mining and Geological Consultants, Inc. and Dighem Surveys and Processing Entity_Attribute_Layer_Name: databases_geosoft Detailed_Description: Entity_Type: Entity_Type_Label: documents Entity_Type_Definition: Project and field reports, survey background information, gridded data explanations, other supporting documentation Entity_Type_Definition_Source: WGM Mining and Geological Consultants, Inc., Dighem Surveys and Processing, and Alaska Division of Geological & Geophysical Surveys Entity_Attribute_Layer_Name: documents Detailed_Description: Entity_Type: Entity_Type_Label: grids_ermapper Entity_Type_Definition: Geographically registered gridded data, ER Mapper ERS format Entity_Type_Definition_Source: WGM Mining and Geological Consultants, Inc., Dighem Surveys and Processing, and Alaska Division of Geological & Geophysical Surveys Entity_Attribute_Layer_Name: grids_ermapper Detailed_Description: Entity_Type: Entity_Type_Label: grids_geosoft Entity_Type_Definition: Geosoft-format binary grids, these grids can be viewed in ESRI ArcMap using a free plugin from Geosoft Entity_Type_Definition_Source: WGM Mining and Geological Consultants, Inc., Dighem Surveys and Processing, and Alaska Division of Geological & Geophysical Surveys Entity_Attribute_Layer_Name: grids_geosoft Detailed_Description: Entity_Type: Entity_Type_Label: images_registered Entity_Type_Definition: GeoTiff format images of all gridded data Entity_Type_Definition_Source: Alaska Division of Geological & Geophysical Surveys (DGGS) Entity_Attribute_Layer_Name: images_registered 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: 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 maps in pdf format Entity_Type_Definition_Source: WGM Mining and Geological Consultants, Inc. and Dighem Surveys and Processing Entity_Attribute_Layer_Name: maps_pdf_format Detailed_Description: Entity_Type: Entity_Type_Label: maps_prn_format Entity_Type_Definition: Printable maps in HPGL/2 printer file format with extension .prn Entity_Type_Definition_Source: WGM Mining and Geological Consultants, Inc. and Dighem Surveys and Processing Entity_Attribute_Layer_Name: maps_prn_format Detailed_Description: Entity_Type: Entity_Type_Label: profiles_stacked Entity_Type_Definition: Distance-based profiles of the digitally recorded geophysical data are generated and plotted at an appropriate scale. The profiles display electromagnetic anomalies with their respective interpretive symbols Entity_Type_Definition_Source: WGM Mining and Geological Consultants, Inc. and Dighem Surveys and Processing Entity_Attribute_Layer_Name: profiles_stacked Detailed_Description: Entity_Type: Entity_Type_Label: vector_data Entity_Type_Definition: Line path, data contours, and survey boundary in ESRI shapefile (SHP) format, ESRI Geodatabase format, and/or AutoCAD dxf format Entity_Type_Definition_Source: WGM Mining and Geological Consultants, Inc., Dighem Surveys and Processing, and Alaska Division of Geological & Geophysical Surveys Entity_Attribute_Layer_Name: vector_data Detailed_Description: Entity_Type: Entity_Type_Label: video_flightpath Entity_Type_Definition: Survey flight path downward-facing video Entity_Type_Definition_Source: WGM Mining and Geological Consultants, Inc. and Dighem Surveys and Processing Entity_Attribute_Layer_Name: video_flightpath 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 Resource_Description: GPR 2019-3 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: DGGS geophysics datasets are typically compilations of multiple digital data file formats. These formats may include: GeoTiff, ESRI shapefile, Geosoft binary grid (GRD), Microsoft Office documents, PDF, ER Mapper ERS, ASCII text files (including CSV), Geosoft ASCII grid (GXF), Geosoft database, AutoCAD DXF, Geosoft plot file (PLT), Printer files (HPP, PRN, or other), digital images (multiple formats), digital video (multiple formats), Geosoft ASCII XYZ, Geosoft ASCII files (PLY, i0, EXP), and KMZ Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: http://doi.org/10.14509/30167 Fees: Free download Metadata_Reference_Information: Metadata_Date: 20190327 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: http://www.dggs.alaska.gov/metadata/dggs.ext Profile_Name: dggs metadata extensions