{"action":"create","ckan_id":null,"date_created":"Tue, 02 Sep 2025 02:21:38 GMT","date_finished":null,"harvest_job_id":"e41ada15-5ac1-489e-84b2-8d267350a687","harvest_source_id":"f4c7bbab-c7ef-4277-a7d3-c25b78854814","id":"1588bae4-3e51-47e9-bd6d-838a57fee83c","identifier":"https://dggs.alaska.gov/webpubs/metadata/DDS12-1.xml","parent_identifier":null,"source_hash":"dc7205dbb024fd04429ea7b8d54c60cd2d3f1970125ba922e4558eee4e88a259","source_raw":"Murchek, J.T.Drenth, B.J.Emond, A.M.2024Yukon-Tanana Upland airborne magnetic geophysical data merge, version 2023digital, dataDigital Data SeriesDDS 12-1Fairbanks, Alaska, United StatesAlaska Division of Geological & Geophysical Surveys8 p.https://doi.org/10.14509/31157Yukon-Tanana Upland airborne magnetic geophysical data merge, version 2023, Digital Data Series 12-1, provides a merged raster grid of magnetic data for the Yukon-Tanana Upland (YTU), Alaska. This dataset provides a regionally consistent magnetic grid while retaining as much detail as possible of the originating data by leveling all the region's magnetic grids to one another. This 100-m cell-size magnetic grid of the YTU will assist in evaluating the region's geologic structure, geologic processes, tectonic evolution, and mineral resource potential. The grid was compiled from previous studies published by the Alaska Division of Geological & Geophysical Surveys (DGGS). The data, as well as additional metadata, are available from the DGGS website: http://doi.org/10.14509/31157.This electromagnetic and magnetic airborne geophysical survey data compilation is a product of the Alaska Division of Geological & Geophysical Surveys' (DGGS) Airborne Geophysical/Geological Mineral Inventory (AGGMI) program and the Alaska Strategic and Critical Minerals Assessment Capital Improvement Project. The goal of the Alaska Division of Geological & Geophysical Surveys' (DGGS) Airborne Geophysical/Geological Mineral Inventory (AGGMI) program is to enhance the understanding of Alaska's mineral resources and stimulate private-sector mineral development. The program seeks to delineate mineral zones on Alaska State lands that: (1) have major economic value; (2) can be developed in the short term to provide high-quality jobs for Alaskans; and (3) will provide economic diversification to help offset the loss of Prudhoe Bay oil revenue. Candidate lands for this program are identified on the basis of existing geologic knowledge, land ownership, and nominations from Alaska's geologic community. The AGGMI program and resulting new geologic knowledge are recognized worldwide and have encouraged millions of dollars of venture capital expenditures in the local economies of the surveyed mining districts. These venture capital expenditures have led to discovery and delineation of new mineral resources. The multi-year Strategic and Critical Minerals Assessment Capital Improvement Project (SCMA) was established to determine Alaska's geologic potential for rare-earth elements and other minerals that are essential for our modern, technology-based society. This program began in FY2012 with a data survey and compilation of existing information on rare-earth-element occurrences in Alaska, and expanded significantly in FY2013 to include additional critical minerals, re-analyses of existing samples, and obtaining new field and analytical data, including airborne geophysics.>ytu_merge_2023: Geosoft format gridded data, ER Mapper format gridded data, ESRI ArcGIS shapefile, and keyhole markup language (.kml) data archive files. Note: these data are provided in both UTM Zone 6 - WGS84 and Geographic WGS84 projections. The data files were compiled from the Yukon-Tanana Upland geophysical surveys.20152023ground conditionCompleteNone planned-151.746048-140.08208366.00708762.469149ISO 19115 Topic CategorygeoscientificInformationAlaska Division of Geological & Geophysical SurveysAirborne Geophysical SurveyDGGSElectromagnetic DataElectromagnetic SurveyGeologicGeologyGeophysical MapGeophysical SurveyGeophysicsGeophysics Search TagMagnetic DataMagnetic SurveyMagneticsAlaska Division of Geological & Geophysical SurveysAlcanBadgerBig DeltaBlack Mining DistrictBonnifield Mining DistrictCentralCharley RiverCharlieskin VillageChatanikaChatanika RiverChena Hot SpringsChena RiverChickaloonChickenChisana Mining DistrictChisana RiverCircle Hot SpringsCircle Mining DistrictCollegeDalton HighwayDelta JunctionDelta RiverDelta River Mining DistrictDot LakeDot Lake VillageDry CreekEagleEagle Mining DistrictEagle VillageElliot HighwayEsterEurekaFairbanksFairbanks Mining DistrictFlume CreekFortymile RiverFoxGerstle RiverGoodpaster Mining DistrictGoodpaster RiverHarding LakeHealy LakeHealy RiverHot Springs Mining DistrictJohnson RiverKalukna RiverKalutna RiverKantishna Mining DistrictKantishna RiverKathakneKechumstukLadue RiverLittle Chena RiverLivengoodManley Hot SpringsMansfield VillageMiller HouseMintoMoose CreekNabesna RiverNabesna VillageNorth PoleNorthwayNorthway JunctionNorthway VillagePleasant ValleyRampart Mining DistrictRichardsonRichardson HighwayRobertson RiverSalcha RiverSeventymile RiverSixtymile RiverTanacrossTanana RiverTatalina RiverTatlanika RiverTaylor HighwayTetlin JunctionTetlin RiverToftyTokTok Mining DistrictTok RiverTolovanaTolovana Mining DistrictTolovana RiverTotatlanika RiverTwo RiversVolkmar RiverWood RiverYukon RiverZitziana RiverAlaska Division of Geological & Geophysical SurveysKandik GroupNeruokpuk QuartziteWickersham GritWickersham UnitYukon-Tanana TerraneYukon-Tanana UplandThis report, map, and/or dataset is available directly from the State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys (see contact information below).Any hard copies or published datasets utilizing these datasets shall clearly indicate their source. If the user has modified the data in any way, the user is obligated to describe the types of modifications the user has made. The user specifically agrees not to misrepresent these datasets, nor to imply that changes made by the user were approved by the State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys. The State of Alaska makes no express or implied warranties (including warranties for merchantability and fitness) with respect to the character, functions, or capabilities of the electronic data or products or their appropriateness for any user's purposes. In no event will the State of Alaska be liable for any incidental, indirect, special, consequential, or other damages suffered by the user or any other person or entity whether from the use of the electronic services or products or any failure thereof or otherwise. In no event will the State of Alaska's liability to the Requestor or anyone else exceed the fee paid for the electronic service or product.Alaska Division of Geological & Geophysical SurveysMetadata Managermailing and physical
3354 College Road
FairbanksAK99709-3707USA(907)451-5020(907)451-5050dggspubs@alaska.gov8 am to 4:30 pm, Monday through Friday, except State holidaysPlease view our website (https://www.dggs.alaska.gov) for the latest information on available data. Please contact us using the e-mail address provided above when possible.The Yukon-Tanana Upland airborne magnetic data merge version 2023 was funded by the U.S. Geological Survey's Earth Mapping Resources Initiative (Earth MRI). 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.Geological Survey of CanadaU.S. Geological Survey2015Yukon - eastern Alaska magnetic gridCanadaNatural Resources Canadahttp://gdr.agg.nrcan.gc.ca/gdrdap/dap/index-eng.php?productid=1587All originating data met contract specifications with a few exceptions due to difficult operational conditions. These exceptions did not noticeably impact data quality. Additional detail about contract specifications and operational issues can be found in the metadata of the originating surveys.These data originate from multiple similar geophysical surveys with different specifications. Reference the metadata of each originating survey for exact specifications.Helicopter and fixed wing geophysical surveys often have small data gaps that do not negatively impact the overall quality of the final products. Reference the metadata for each originating survey for specific details.All originating data were positioned by DGPS (Differential Global Positioning System) with an accuracy of 5 meters or better. Note: these data are provided in both UTM Zone 6 - NAD27 (originating coordinate system) and Geographic WGS84 coordinates.Burns, L.E.Geoterrex-DighemStevens Exploration Management Corp.Emond, A.M.Graham, G.R.C.2015Fortymile mining district electromagnetic and magnetic airborne geophysical survey data compilationGeophysical ReportGPR 2015-4Fairbanks, Alaska, United StatesAlaska Division of Geological & Geophysical Surveys12 phttps://doi.org/10.14509/29411digital data2015publication dateBurns, L.E. and others, 2015Data compilation and processingBurns, L.E.Geoterrex-DighemStevens Exploration Management Corp.Emond, A.M.Graham, G.R.C.2015Livengood mining district electromagnetic and magnetic airborne geophysical survey data compilationGeophysical ReportGPR 2015-5Fairbanks, Alaska, United StatesAlaska Division of Geological & Geophysical Surveys11 phttps://doi.org/10.14509/29412digital data2015publication dateBurns, L.E. and others, 2015Data compilation and processingBurns, L.E.Graham, G.R.C.Barefoot, J.D.Fugro Airborne Surveys Corp.Stevens Exploration Management Corp.2019Black Mountain electromagnetic and magnetic airborne geophysical survey data compilationGeophysical ReportGPR 2018-3Fairbanks, Alaska, United StatesAlaska Division of Geological & Geophysical Surveys12 phttps://doi.org/10.14509/29756digital data2019publication dateBurns, L.E. and others, 2019Data compilation and processingBurns, L.E.Graham, G.R.C.Barefoot, J.D.Fugro Airborne Surveys Corp.Stevens Exploration Management Corp.2019East Richardson electromagnetic and magnetic airborne geophysical survey data compilationGeophysical ReportGPR 2018-1Fairbanks, Alaska, United StatesAlaska Division of Geological & Geophysical Surveys12 phttps://doi.org/10.14509/29754digital data2019publication dateBurns, L.E. and others, 2019Data compilation and processingBurns, L.E.Graham, G.R.C.Barefoot, J.D.Woods, Rebecca-EllenDighemWGM, Inc.Fugro Airborne SurveysStevens Exploration Management Corp.2019Fairbanks electromagnetic and magnetic airborne geophysical survey data compilationGeophysical ReportGPR 2019-18Fairbanks, Alaska, United StatesAlaska Division of Geological & Geophysical Surveys13 phttps://doi.org/10.14509/30230digital data2019publication dateBurns, L.E. and others, 2019Data compilation and processingBurns, L.E.Barefoot, J.D.Naibert, T.J.Fugro Airborne Surveys Corp.Stevens Exploration Management Corp.2019Goodpaster electromagnetic and magnetic airborne geophysical survey data compilationGeophysical ReportGPR 2018-4Fairbanks, Alaska, United StatesAlaska Division of Geological & Geophysical Surveys3 phttps://doi.org/10.14509/29813digital data2019publication dateBurns, L.E. and others, 2019Data compilation and processingBurns, L.E.Graham, G.R.C.Barefoot, J.D.Fugro Airborne Surveys Corp.Stevens Exploration Management Corp.2019Liscum electromagnetic and magnetic airborne geophysical survey data compilationGeophysical ReportGPR 2018-2Fairbanks, Alaska, United StatesAlaska Division of Geological & Geophysical Surveys12 phttps://doi.org/10.14509/29755digital data2019publication dateBurns, L.E. and others, 2019Data compilation and processingBurns, L.E.Graham, G.R.C.Barefoot, J.D.Fugro Airborne SurveysStevens Exploration Management Corp.2019Northeast Fairbanks electromagnetic and magnetic airborne geophysical survey data compilationGeophysical ReportGPR 2018-11Fairbanks, Alaska, United StatesAlaska Division of Geological & Geophysical Surveys12 phttps://doi.org/10.14509/30062digital data2019publication dateBurns, L.E. and others, 2019Data compilation and processingBurns, L.E.Barefoot, J.D.Graham, G.R.C.Naibert, T.J.Geoterrex-DighemStevens Exploration Management Corp.2019Salcha River-Pogo electromagnetic, magnetic, and radiometric airborne geophysical survey data compilationGeophysical ReportGPR 2019-8Fairbanks, Alaska, United StatesAlaska Division of Geological & Geophysical Surveys22 phttps://doi.org/10.14509/30179digital data2019publication dateBurns, L.E. and others, 2019Data compilation and processingBurns, L.E.Graham, G.R.C.Barefoot, J.D.Naibert, T.J.Fugro Airborne Surveys Corp.Stevens Exploration Management Corp.2019Southeastern extension of Salcha River-Pogo electromagnetic and magnetic airborne geophysical survey data compilationGeophysical ReportGPR 2019-9Fairbanks, Alaska, United StatesAlaska Division of Geological & Geophysical Surveys12 phttps://doi.org/10.14509/30185digital data2019publication dateBurns, L.E. and others, 2019Data compilation and processingBurns, L.E.Graham, G.R.C.Emond, A.M.Stevens Exploration Management Corp.Fugro Airborne Surveys2020Alaska Highway corridor electromagnetic and magnetic airborne geophysical survey data compilationGeophysical ReportGPR 2020-15Fairbanks, Alaska, United StatesAlaska Division of Geological & Geophysical Surveys17 phttps://doi.org/10.14509/30462digital data2020publication dateBurns, L.E. and others, 2020Data compilation and processingBurns, L.E.Graham, G.R.C.Barefoot, J.D.Woods, Rebecca-EllenDighemMcConnell, D.L.WGM, Inc.Stevens Exploration Management Corp.Fugro Airborne Surveys Corp.2020Headwaters of the Little Chena River electromagnetic and magnetic airborne geophysical survey data compilationGeophysical ReportGPR 2020-4Fairbanks, Alaska, United StatesAlaska Division of Geological & Geophysical Surveys12 phttps://doi.org/10.14509/30418digital data2020publication dateBurns, L.E. and others, 2020Data compilation and processingBurns, L.E.Graham, G.R.C.Barefoot, J.D.Naibert, T.J.Fugro Airborne Surveys Corp.Fugro GeoServices, Inc.2020Ladue electromagnetic and magnetic airborne geophysical survey data compilationGeophysical ReportGPR 2019-20Fairbanks, Alaska, United StatesAlaska Division of Geological & Geophysical Surveys15 phttps://doi.org/10.14509/30261digital data2020publication dateBurns, L.E. and others, 2020Data compilation and processingBurns, L.E.Graham, G.R.C.Barefoot, J.D.Woods, Rebecca-EllenDighemPritchard, R.A.WGM, Inc.Stevens Exploration Management Corp.Fugro Airborne Surveys Corp.2020Rampart-Manley electromagnetic and magnetic airborne geophysical survey data compilationGeophysical ReportGPR 2020-3Fairbanks, Alaska, United StatesAlaska Division of Geological & Geophysical Surveys13 phttps://doi.org/10.14509/30417digital data2020publication dateBurns, L.E. and others, 2020Data compilation and processingBurns, L.E.Graham, G.R.C.Barefoot, J.D.Woods, Rebecca-EllenDighemWGM, Inc.2020Richardson electromagnetic and magnetic airborne geophysical survey data compilationGeophysical ReportGPR 2019-22Fairbanks, Alaska, United StatesAlaska Division of Geological & Geophysical Surveys12 phttps://doi.org/10.14509/30263digital data2020publication dateBurns, L.E. and others, 2020Data compilation and processingEmond, A.M.Saltus, R.W.Graham, G.R.C.Goldak Airborne Surveys2015Airborne magnetic geophysical survey of the Tanacross region, AlaskaGeophysical ReportGPR 2015-6Fairbanks, Alaska, United StatesAlaska Division of Geological & Geophysical Surveys12 phttps://doi.org/10.14509/29514digital data2015publication dateEmond, A.M. and others, 2015Data compilation and processingEmond, A.M.Daanen, R.P.Graham, G.R.C.Walter Anthony, KateyLiljedahl, A.K.Minsley, B.J.Barnes, D.L.Romanovsky, V.E.CGG Canada Services Ltd.2018Airborne electromagnetic and magnetic survey, Goldstream Creek watershed, interior AlaskaGeophysical ReportGPR 2016-5Fairbanks, Alaska, United StatesAlaska Division of Geological & Geophysical Surveys14 phttps://doi.org/10.14509/29681digital data2018publication dateEmond, A.M. and others, 2018Data compilation and processingEmond, A.M.Minsley, B.J.Daanen, R.P.Graham, G.R.C.CGG2018Airborne electromagnetic and magnetic survey, western Yukon Flats, interior AlaskaGeophysical ReportGPR 2016-2Fairbanks, Alaska, United StatesAlaska Division of Geological & Geophysical Surveys3 phttps://doi.org/10.14509/29683digital data2018publication dateEmond, A.M. and others, 2018Data compilation and processingEmond, A.M.MPX Geophysics LTD2020Shaw Creek and Shawnee Peak airborne magnetic and radiometric geophysical surveyGeophysical ReportGPR 2020-16Fairbanks, Alaska, United StatesAlaska Division of Geological & Geophysical Surveys2 phttps://doi.org/10.14509/30551digital data2020publication dateEmond, A.M. and MPX Geophysics LTD, 2020Data compilation and processingEmond, A.M.MPX Geophysics LTD2021Eagle airborne magnetic and radiometric geophysical surveyGeophysical ReportGPR 2021-2Fairbanks, Alaska, United StatesAlaska Division of Geological & Geophysical Surveys4 phttps://doi.org/10.14509/30755digital data2021publication dateEmond, A.M. and MPX Geophysics LTD, 2021Data compilation and processingEmond, A.M.MPX Geophysics LTD2021White Mountains airborne magnetic and radiometric geophysical surveyGeophysical ReportGPR 2021-3Fairbanks, Alaska, United StatesAlaska Division of Geological & Geophysical Surveys4 phttps://doi.org/10.14509/30756digital data2021publication dateEmond, A.M. and MPX Geophysics LTD, 2021Data compilation and processingEmond, A.M.MPX Geophysics LTD2022Tanana River and Big Delta airborne magnetic and radiometric surveyGeophysical ReportGPR 2022-1Fairbanks, Alaska, United StatesAlaska Division of Geological & Geophysical Surveys4 phttps://doi.org/10.14509/30899digital data2022publication dateEmond, A.M. and MPX Geophysics LTD, 2022Data compilation and processingData compilation and processing - Thirty-four individual aeromagnetic datasets from the YTU were processed, gridded, and merged using Oasis montaj. The purpose of this project was to create a singular grid for the YTU to aid in the geological interpretation of the area. For each dataset, the International Geomagnetic Reference Field (IGRF)-corrected aeromagnetic data were gridded at one-fourth of their flight line spacing. The data were continued to 350 meters with the Oasis montaj extension Compudrape using the chessboard method (Cordell, 1985). The chessboard method continues the data in small increments to multiple parallel surfaces until the desired elevation is reached (Phillips, 1996). We chose 350 meters for continuation because it was the lowest elevation the fixed-wing surveys could be continued without the introduction of artifacts. Several fixed-wing surveys (Eagle, Tanana-Big Delta, White Mountains) required the smoothing of radar altimeter readings prior to continuation due to the presence of steep topographic gradients. These gradient-generated artifacts were successfully removed by the smoothing of the radar grids. Decorrugation of the data was performed following continuation on these fixed-wing surveys to remove along-line artifacts. Following the processing of each dataset, the data were merged using the Oasis montaj Gridknit extension. Static shifts were applied in the merging process along survey boundaries to suture the datasets together. The merged grid *_residualmag was the product of this process and represents a merged total-field anomaly map of the YTU. It should be noted that the Circle dataset was not used in this merge due to data-processing errors that cannot be corrected. A reduction-to-pole (RTP) was performed on the total-field anomaly dataset to shift the magnetic field to vertical (inclination: 90 degrees, declination: 0 degrees) to locate anomalies directly above the producing bodies. The inclination used for RTP was 77.26 degrees and the declination was 18.78 degrees. The RTP dataset is represented by the dataset *_rtp. A first-vertical derivative of the data was computed from the RTP dataset to remove long-wavelength features and enhance short-wavelength anomalies. This dataset is represented by *_c1vdmag. Finally, the horizontal gradient magnitude (HGM) was calculated from the RTP dataset to delineate the edges of anomalous bodies and geologic contacts. This dataset is represented by *_hgrad_magnitude. Bibliographic references and the processing and gridding parameters for each individual dataset are described in the accompanying report.Burns, L.E. and others, 2015Burns, L.E. and others, 2015Burns, L.E. and others, 2019Burns, L.E. and others, 2019Burns, L.E. and others, 2019Burns, L.E. and others, 2019Burns, L.E. and others, 2019Burns, L.E. and others, 2019Burns, L.E. and others, 2019Burns, L.E. and others, 2019Burns, L.E. and others, 2020Burns, L.E. and others, 2020Burns, L.E. and others, 2020Burns, L.E. and others, 2020Burns, L.E. and others, 2020Emond, A.M. and others, 2015Emond, A.M. and others, 2018Emond, A.M. and others, 2018Emond, A.M. and MPX Geophysics LTD, 2020Emond, A.M. and MPX Geophysics LTD, 2021Emond, A.M. and MPX Geophysics LTD, 2021Emond, A.M. and MPX Geophysics LTD, 20222022rasterUniversal Transverse Mercator60.999600-1470500000.0000000coordinate pair.00000001.00000001MetersWGS84WGS 846378137298.257223563ytu_merge_2023Geosoft format gridded data, ER Mapper format gridded data, ESRI ArcGIS shapefile, and keyhole markup language (.kml) data archive files. Note: these data are provided in both UTM Zone 6 - WGS84 and Geographic WGS84 projections. The data files were compiled from the Yukon-Tanana Upland geophysical surveys.Alaska Division of Geological & Geophysical Surveys (DGGS) and contractor.ytu_merge_2023Alaska Division of Geological & Geophysical SurveysMetadata Managermailing and physical
3354 College Road
FairbanksAK99709-3707USA(907)451-5020(907)451-5050dggspubs@alaska.gov8 am to 4:30 pm, Monday through Friday, except State holidaysPlease view our website (https://www.dggs.alaska.gov) for the latest information on available data. Please contact us using the e-mail address provided above when possible.DDS 12-1The State of Alaska makes no expressed or implied warranties (including warranties for merchantability and fitness) with respect to the character, functions, or capabilities of the electronic data or products or their appropriateness for any user's purposes. In no event will the State of Alaska be liable for any incidental, indirect, special, consequential, or other damages suffered by the user or any other person or entity whether from the use of the electronic services or products or any failure thereof or otherwise. In no event will the State of Alaska's liability to the Requestor or anyone else exceed the fee paid for the electronic service or product.DGGS publications are available as free online downloads or you may purchase paper hard-copies or digital files on CD/DVD or other digital storage media by mail, phone, fax, or email from the DGGS Fairbanks office. To purchase this or other printed reports and maps, contact DGGS by phone (907-451-5020), e-mail (dggspubs@alaska.gov), or fax (907-451-5050). Payment accepted: Cash, check, money order, VISA, or MasterCard. Turnaround time is 1-2 weeks unless special arrangements are made and an express fee is paid. Shipping charge will be the actual cost of postage and will be added to the total amount due. Contact us for the exact shipping amount.Contact DGGS for current pricingGeosoft format gridded data, ER Mapper format gridded data, ESRI ArcGIS shapefile, and keyhole markup language (.kml) data archive fileshttps://doi.org/10.14509/31157Free download20240507Alaska Division of Geological & Geophysical SurveysSimone MontayneMetadata Managermailing and physical
3354 College Road
FairbanksAK99709-3707USA(907)451-5020(907)451-5050dggspubs@alaska.gov8 am to 4:30 pm, Monday through Friday, except State holidaysFGDC Content Standard for Digital Geospatial MetadataFGDC-STD-001-1998If the user has modified the data in any way they are obligated to describe the types of modifications they have performed in the supporting metadata file. User specifically agrees not to imply that changes they made were approved by the Alaska Department of Natural Resources or Division of Geological & Geophysical Surveys.https://dggs.alaska.gov/metadata/dggs.extdggs metadata extensions","source_transform":null,"status":"error"}