{"action":"create","ckan_id":null,"date_created":"Sat, 07 Feb 2026 20:29:02 GMT","date_finished":null,"harvest_job_id":"5e5e88d9-683a-467f-8bee-1d6cfcb471c0","harvest_source_id":"31f41541-38a0-400b-b240-10ebcb0acd9a","id":"d78a87a1-4872-4e62-900a-db9da57cf5c3","identifier":"https://dggs.alaska.gov/webpubs/metadata/GPR2020-4.xml","parent_identifier":null,"source_hash":"0de12d692c96f17d506611bfb42545bd98ec2a9f6358531682709cd9417e8d34","source_raw":"\n\n\n\n\nBurns, L.E.\nGraham, G.R.C.\nBarefoot, J.D.\nWoods, Rebecca-Ellen\nDighem\nMcConnell, D.L.\nWGM, Inc.\nStevens Exploration Management Corp.\nFugro Airborne Surveys Corp.\n2020\nHeadwaters of the Little Chena River electromagnetic and magnetic airborne geophysical survey data compilation\ndigital data\n\nGeophysical Report\nGPR 2020-4\n\n\nFairbanks, Alaska, United States\nAlaska Division of Geological & Geophysical Surveys\n\n12 p.\nhttp://doi.org/10.14509/30418\n\n\n\nThe Headwaters of the Little Chena River electromagnetic and magnetic airborne geophysical survey is located in interior Alaska in the Fairbanks mining district, about 60 kilometers northeast of Fairbanks, Alaska. Frequency domain electromagnetic and magnetic data were collected with the DIGHEMV system in August 1994. A total of 135 line kilometers were collected covering 60.6 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/10.14509/30418.\nThis 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. Small placer gold prospects near the survey area include Flat Creek and Sorrels Creek. Other gold and base-metal anomalies, altered zones, favorable lithologies, and structural zones are known to exist throughout the survey area.\n\n>ascii_data: ASCII format line data, other ASCII data\t\n>databases_geosoft: Geosoft format database of line data, other Geosoft format databases\t\n>documents: Project and field reports, survey background information, gridded data explanations, other supporting documentation\t\n>grids_ermapper: Geographically registered gridded data, ER Mapper ERS format\t\n>grids_geosoft: Geosoft-format binary grids, these grids can be viewed in ESRI ArcMap using a free plugin from Geosoft or using the free viewer available from Geosoft\t\n>images_registered: GeoTiff format images of all gridded data\t\n>kmz: Keyhole markup language (kml) kmz archive files of project data. Viewable in Google Earth and other compatible programs\t\n>maps_pdf_format: Printable maps in pdf format\t\n>maps_prn_format: Printable maps in HPGL/2 printer file format with extension .prn\t\n>vector_data: Line path, data contours, and survey boundary in ESRI shapefile (SHP) format, ESRI Geodatabase format, and/or AutoCAD dxf format\n\n\n\n\n\n\n1994\n\n\n2020\n\n\n\nground condition\n\n\ncomplete\nNone planned\n\n\n\n-146.734766\n-146.482731\n65.198962\n65.150082\n\n\n\n\nISO 19115 Topic Category\ngeoscientificInformation\n\n\nAlaska Division of Geological & Geophysical Surveys\nAeromagnetic\nAeromagnetic Data\nAeromagnetic Map\nAeromagnetic Survey\nAirborne Geophysical Survey\nAnalytic Signal\nApparent Resistivity Data\nApparent Resistivity Map\nApparent Resistivity Survey\nConductivity Survey\nElectromagnetic Data\nElectromagnetic Survey\nExploration\nFirst Vertical Derivative\nFrequency Domain Electromagnetic Data\nGeologic\nGeology\nGeophysical Map\nGeophysical Survey\nGeophysics\nGeophysics Search Tag\nGridded Data\nLine Data\nMagnetic Data\nMagnetic Survey\nMagnetics\nRemote Sensing\nResistivity\nResistivity Survey\n\n\nAlaska Division of Geological & Geophysical Surveys\nFairbanks Mining District\nFlat Creek\nFrozenfoot Creek\nLittle Chena River\nSmith Creek\nSorrels Creek\n\n\nThis 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).\nAny 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.\n\n\n\nAlaska Division of Geological & Geophysical Surveys\n\nMetadata Manager\n\nmailing and physical\n
3354 College Road
\nFairbanks\nAK\n99709-3707\nUSA\n\n(907)451-5020\n(907)451-5050\ndggspubs@alaska.gov\n8 am to 4:30 pm, Monday through Friday, except State holidays\n\n\nFunding was provided by the Alaska State Legislature as part of the DGGS Airborne Geophysical/Geological Mineral Inventory (AGGMI) program.\n\n\nDGGS Staff\n2014\nAirborne GeophysWeb: A compilation of geophysical data from DGGS and cooperating agencies\n\nDigital Data Series\nDDS 2\n\n\nFairbanks, Alaska, United States\nAlaska Division of Geological & Geophysical Surveys\n\nhttp://doi.org/10.14509/27222\n\n\n\n\nDGGS Staff\n2016\nAlaska merged geophysical data grids\n\nDigital Data Series\nDDS 12\n\n\nFairbanks, Alaska, United States\nAlaska Division of Geological & Geophysical Surveys\n\n3 p\nhttp://doi.org/10.14509/29555\n\n\n\n\n\nGeophysical 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.\n\nData originate from one company using the same contract specifications for all data. The originating coordinate system was retained for all publication products.\nThis data set includes files that contain processed aeromagnetic measurements, electromagnetic measurements, altimetry measurements, and locational data for the entire survey area.\n\n\nThese data are positioned with post-processed differential GPS. Discussion of grid resolution and factors that may impact the overall horizontal accuracy of the gridded data is available in the documents directory of this data distribution package.\n\n\nNot applicable\n\n\n\n\n\n\nAlaska Division of Geological & Geophysical Surveys\nDighem\nWGM, Inc.\n1995\n7200 Hz resistivity contours of the Little Chena River headwaters\n\nPublic Data File\nPDF 95-15\n\n\nFairbanks, Alaska, United States\nAlaska Division of Geological & Geophysical Surveys\n\n1 sheet, scale 1:31,680\nhttp://doi.org/10.14509/1694\n\n\n31680\npaper\n\n\n\n1995\n\n\npublication date\n\nAlaska Division of Geological & Geophysical Surveys and others, 1995\nData collection, processing, and delivery\n\n\n\n\nAlaska Division of Geological & Geophysical Surveys\nDighem\nWGM, Inc.\n1995\n900 Hz resistivity contours of the Little Chena River headwaters\n\nPublic Data File\nPDF 95-14\n\n\nFairbanks, Alaska, United States\nAlaska Division of Geological & Geophysical Surveys\n\n1 sheet, scale 1:31,680\nhttp://doi.org/10.14509/1693\n\n\n31680\npaper\n\n\n\n1995\n\n\npublication date\n\nAlaska Division of Geological & Geophysical Surveys and others, 1995\nData collection, processing, and delivery\n\n\n\n\nAlaska Division of Geological & Geophysical Surveys\nDighem\nWGM, Inc.\n1995\nCD-ROM containing gridded files and section lines of 1994 survey data for Fairbanks and Richardson mining districts and part of the Circle A-6 Quadrangle\n\nPublic Data File\nPDF 95-19\n\n\nFairbanks, Alaska, United States\nAlaska Division of Geological & Geophysical Surveys\n\n1 DVD\nhttp://doi.org/10.14509/1698\n\n\npaper\n\n\n\n1995\n\n\npublication date\n\nAlaska Division of Geological & Geophysical Surveys and others, 1995\nData collection, processing, and delivery\n\n\n\n\nAlaska Division of Geological & Geophysical Surveys\nDighem\nWGM, Inc.\n1995\nClear mylar version of PDF 95-13: Total field magnetics and electromagnetic anomalies of the Little Chena River headwaters\n\nPublic Data File\nPDF 95-16\n\n\nFairbanks, Alaska, United States\nAlaska Division of Geological & Geophysical Surveys\n\n1 sheet, scale 1:31,680\nhttp://doi.org/10.14509/1695\n\n\n31680\npaper\n\n\n\n1995\n\n\npublication date\n\nAlaska Division of Geological & Geophysical Surveys and others, 1995\nData collection, processing, and delivery\n\n\n\n\nAlaska Division of Geological & Geophysical Surveys\nDighem\nWGM, Inc.\n1995\nTotal field magnetics and electromagnetic anomalies of Little Chena River headwaters\n\nPublic Data File\nPDF 95-13\n\n\nFairbanks, Alaska, United States\nAlaska Division of Geological & Geophysical Surveys\n\n1 sheet, scale 1:31,680\nhttp://doi.org/10.14509/1692\n\n\n31680\npaper\n\n\n\n1995\n\n\npublication date\n\nAlaska Division of Geological & Geophysical Surveys and others, 1995\nData collection, processing, and delivery\n\n\n\n\nAlaska Division of Geological & Geophysical Surveys\nDighem\nWGM, Inc.\n1995\nTotal field magnetics of the Little Chena River headwaters\n\nPublic Data File\nPDF 95-17\n\n\nFairbanks, Alaska, United States\nAlaska Division of Geological & Geophysical Surveys\n\n1 sheet, scale 1:63,360\nhttp://doi.org/10.14509/1696\n\n\n63360\npaper\n\n\n\n1995\n\n\npublication date\n\nAlaska Division of Geological & Geophysical Surveys and others, 1995\nData collection, processing, and delivery\n\n\n\n\nBurns, L.E.\nFugro Airborne Surveys Corp.\nStevens Exploration Management Corp.\n2005\nLine, gridded, and vector data, and selected plot files of airborne geophysical survey data of the Headwaters Little Chena River area, Alaska\n\nGeophysical Report\nGPR 2004-7\n\n\nFairbanks, Alaska, United States\nAlaska Division of Geological & Geophysical Surveys\n\n1 DVD\nhttp://doi.org/10.14509/14450\n\n\npaper\n\n\n\n2005\n\n\npublication date\n\nBurns, L.E. and others, 2005\nData collection, processing, and delivery\n\n\n\n\nMcConnell, D.L.\nWGM, Inc.\nDighem\n1995\nProject report of the Little Chena River headwaters\n\nPublic Data File\nPDF 95-18\n\n\nFairbanks, Alaska, United States\nAlaska Division of Geological & Geophysical Surveys\n\n65 p., 1 sheet, scale 1:31,680\nhttp://doi.org/10.14509/1697\n\n\n31680\npaper\n\n\n\n1995\n\n\npublication date\n\nMcConnell, D.L. and others, 1995\nData collection, processing, and delivery\n\n\nData collection, processing, and delivery - The airborne geophysical data were acquired under 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.\nAlaska Division of Geological & Geophysical Surveys and others, 1995\nAlaska Division of Geological & Geophysical Surveys and others, 1995\nAlaska Division of Geological & Geophysical Surveys and others, 1995\nAlaska Division of Geological & Geophysical Surveys and others, 1995\nAlaska Division of Geological & Geophysical Surveys and others, 1995\nAlaska Division of Geological & Geophysical Surveys and others, 1995\nBurns, L.E. and others, 2005\nMcConnell, D.L. and others, 1995\n1994\n\n\nData reformat - The 1994 digital data were reformatted by Fugro Airborne Surveys and Stevens Exploration Management Corp. for ease of use with modern processing tools, vector files were added, and new color maps were produced; no reprocessing was done.\n2004\n\n\nGrid development - 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.\n2019\n\n\nRGB 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.\n2019\n\n\nGeoPDF creation - Geospatial pdf file created using the Export Map function in Geosoft Oasis Montaj v9 with all maps layers visible.\n2019\n\n\nDXF conversion and geographic referencing - Contractor provided AutoCAD DXF files were converted to an ESRI Geodatabase in ArcMap v10 using the CAD to Geodatabase tool.\n2019\n\n\nStandard 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.\n2019\n\n\nKeyhole 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.\n2019\n\n\nSimulated 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.\n2019\n\n\nData 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 reports, missing data type explanations, and metadata were created.\n2019\n\n\n\n\n\n\n\nUniversal Transverse Mercator\n\n6\n\n0.999600\n-147\n0\n500000.000000\n0\n\n\n\n\ncoordinate pair\n\n.00000001\n.00000001\n\nMeters\n\n\n\nNorth American Datum of 1927\nClarke 1866\n6378206.40000000037\n294.978698199999997\n\n\n\n\n\n\nascii_data\nASCII format line data, other ASCII data\nDighem, McConnell, D.L., WGM, Inc., Stevens Exploration Management Corp., and Fugro Airborne Surveys Corp.\nascii_data\n\n\n\n\ndatabases_geosoft\nGeosoft format database of line data, other Geosoft format databases\nDighem, McConnell, D.L., WGM, Inc., Stevens Exploration Management Corp., and Fugro Airborne Surveys Corp.\ndatabases_geosoft\n\n\n\n\ndocuments\nProject and field reports, survey background information, gridded data explanations, other supporting documentation\nDighem, McConnell, D.L., WGM, Inc., Stevens Exploration Management Corp., and Fugro Airborne Surveys Corp. and Alaska Division of Geological & Geophysical Surveys (DGGS)\ndocuments\n\n\n\n\ngrids_ermapper\nGeographically registered gridded data, ER Mapper ERS format\nDighem, McConnell, D.L., WGM, Inc., Stevens Exploration Management Corp., and Fugro Airborne Surveys Corp. and Alaska Division of Geological & Geophysical Surveys (DGGS)\ngrids_ermapper\n\n\n\n\ngrids_geosoft\nGeosoft-format binary grids, these grids can be viewed in ESRI ArcMap using a free plugin from Geosoft or using the free viewer available from Geosoft\nDighem, McConnell, D.L., WGM, Inc., Stevens Exploration Management Corp., and Fugro Airborne Surveys Corp. and Alaska Division of Geological & Geophysical Surveys (DGGS)\ngrids_geosoft\n\n\n\n\nimages_registered\nGeoTiff format images of all gridded data\nAlaska Division of Geological & Geophysical Surveys (DGGS)\nimages_registered\n\n\n\n\nkmz\nKeyhole markup language (kml) kmz archive files of project data. Viewable in Google Earth and other compatible programs\nAlaska Division of Geological & Geophysical Surveys (DGGS)\nkmz\n\n\n\n\nmaps_pdf_format\nPrintable maps in pdf format\nDighem, McConnell, D.L., WGM, Inc., Stevens Exploration Management Corp., and Fugro Airborne Surveys Corp.\nmaps_pdf_format\n\n\n\n\nmaps_prn_format\nPrintable maps in HPGL/2 printer file format with extension .prn\nDighem, McConnell, D.L., WGM, Inc., Stevens Exploration Management Corp., and Fugro Airborne Surveys Corp.\nmaps_prn_format\n\n\n\n\nvector_data\nLine path, data contours, and survey boundary in ESRI shapefile (SHP) format, ESRI Geodatabase format, and/or AutoCAD dxf format\nDighem, McConnell, D.L., WGM, Inc., Stevens Exploration Management Corp., and Fugro Airborne Surveys Corp. and Alaska Division of Geological & Geophysical Surveys (DGGS)\nvector_data\n\n\n\n\n\n\n\nAlaska Division of Geological & Geophysical Surveys\n\nMetadata Manager\n\nmailing and physical\n
3354 College Road
\nFairbanks\nAK\n99709-3707\nUSA\n\n(907)451-5020\n(907)451-5050\ndggspubs@alaska.gov\n8 am to 4:30 pm, Monday through Friday, except State holidays\n\n\nGPR 2020-4\nThe 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.\n\nDGGS 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.\nContact DGGS for current pricing\n\n\n\n\nDGGS 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\n\n\n\n\n\nhttp://doi.org/10.14509/30418\n\n\n\n\n\nFree download\n\n\n\n20200311\n\n\n\nAlaska Division of Geological & Geophysical Surveys\nSimone Montayne\n\nMetadata Manager\n\nmailing and physical\n
3354 College Road
\nFairbanks\nAK\n99709-3707\nUSA\n\n(907)451-5020\n(907)451-5050\ndggspubs@alaska.gov\n8 am to 4:30 pm, Monday through Friday, except State holidays\n\n\nFGDC Content Standard for Digital Geospatial Metadata\nFGDC-STD-001-1998\nIf 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.\n\nhttp://www.dggs.alaska.gov/metadata/dggs.ext\ndggs metadata extensions\n\n\n\n","source_transform":null,"status":"error"}