53e89807-8e8e-469f-ba20-595ac27fd113_source eng; USA utf8 dataset Simone Montayne Alaska Division of Geological & Geophysical Surveys Metadata Manager (907)451-5020 (907)451-5050 3354 College Road Fairbanks AK 99709-3707 USA dggspubs@alaska.gov 8 am to 4:30 pm, Monday through Friday, except State holidays pointOfContact 2024-05-07 ISO 19115 Geographic Information - Metadata ISO 19115:2003/Cor.1:2006(E) Yukon-Tanana Upland airborne magnetic geophysical data merge, version 2023 2024-01-01 publication Alaska Division of Geological & Geophysical Surveys Fairbanks Alaska, United States publisher Murchek, J.T. originator Drenth, B.J. originator Emond, A.M. originator https://doi.org/10.14509/31157 DIGITAL, DATA Digital Data Series DDS 12-1 8 p. Yukon-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. 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. completed Alaska Division of Geological & Geophysical Surveys Metadata Manager (907)451-5020 (907)451-5050 3354 College Road Fairbanks AK 99709-3707 USA dggspubs@alaska.gov 8 am to 4:30 pm, Monday through Friday, except State holidays 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. pointOfContact notPlanned Airborne Geophysical Survey DGGS Electromagnetic Data Electromagnetic Survey Geologic Geology Geophysical Map Geophysical Survey Geophysics Geophysics Search Tag Magnetic Data Magnetic Survey Magnetics theme Alaska Division of Geological & Geophysical Surveys Alcan Badger Big Delta Black Mining District Bonnifield Mining District Central Charley River Charlieskin Village Chatanika Chatanika River Chena Hot Springs Chena River Chickaloon Chicken Chisana Mining District Chisana River Circle Hot Springs Circle Mining District College Dalton Highway Delta Junction Delta River Delta River Mining District Dot Lake Dot Lake Village Dry Creek Eagle Eagle Mining District Eagle Village Elliot Highway Ester Eureka Fairbanks Fairbanks Mining District Flume Creek Fortymile River Fox Gerstle River Goodpaster Mining District Goodpaster River Harding Lake Healy Lake Healy River Hot Springs Mining District Johnson River Kalukna River Kalutna River Kantishna Mining District Kantishna River Kathakne Kechumstuk Ladue River Little Chena River Livengood Manley Hot Springs Mansfield Village Miller House Minto Moose Creek Nabesna River Nabesna Village North Pole Northway Northway Junction Northway Village Pleasant Valley Rampart Mining District Richardson Richardson Highway Robertson River Salcha River Seventymile River Sixtymile River Tanacross Tanana River Tatalina River Tatlanika River Taylor Highway Tetlin Junction Tetlin River Tofty Tok Tok Mining District Tok River Tolovana Tolovana Mining District Tolovana River Totatlanika River Two Rivers Volkmar River Wood River Yukon River Zitziana River place Alaska Division of Geological & Geophysical Surveys Kandik Group Neruokpuk Quartzite Wickersham Grit Wickersham Unit Yukon-Tanana Terrane Yukon-Tanana Upland stratum Alaska Division of Geological & Geophysical Surveys 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. otherRestrictions 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. otherRestrictions 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). Yukon - eastern Alaska magnetic grid 2015-01-01 publication Natural Resources Canada Canada publisher Geological Survey of Canada originator U.S. Geological Survey originator http://gdr.agg.nrcan.gc.ca/gdrdap/dap/index-eng.php?productid=1587 crossReference grid eng; USA geoscientificInformation -151.746048 -140.082083 62.469149 66.007087 2015-01-01 2023-01-01 >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. true Geosoft format gridded data, ER Mapper format gridded data, ESRI ArcGIS shapefile, and keyhole markup language (.kml) data archive files unknown Alaska Division of Geological & Geophysical Surveys Metadata Manager (907)451-5020 (907)451-5050 3354 College Road Fairbanks AK 99709-3707 USA dggspubs@alaska.gov 8 am to 4:30 pm, Monday through Friday, except State holidays 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. distributor Contact DGGS for current pricing Free download https://doi.org/10.14509/31157 Geosoft format gridded data, ER Mapper format gridded data, ESRI ArcGIS shapefile, and keyhole markup language (.kml) data archive files CSDGM IMPORT ERROR: No digtinfo/formcont information dataset Horizontal Positional Accuracy Report 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. 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. 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. These data originate from multiple similar geophysical surveys with different specifications. Reference the metadata of each originating survey for exact specifications. This lineage was generated by the FGDC CSDGM to 19139 transformation Data 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. 2022-01-01T00:00:00 Source Contribution: Data compilation and processingSource Type: digital data Fortymile mining district electromagnetic and magnetic airborne geophysical survey data compilation 2015-01-01 publication Alaska Division of Geological & Geophysical Surveys Fairbanks Alaska, United States publisher Burns, L.E. originator Geoterrex-Dighem originator Stevens Exploration Management Corp. originator Emond, A.M. originator Graham, G.R.C. originator https://doi.org/10.14509/29411 Geophysical Report GPR 2015-4 12 p 2015-01-01 Source Contribution: Data compilation and processingSource Type: digital data Livengood mining district electromagnetic and magnetic airborne geophysical survey data compilation 2015-01-01 publication Alaska Division of Geological & Geophysical Surveys Fairbanks Alaska, United States publisher Burns, L.E. originator Geoterrex-Dighem originator Stevens Exploration Management Corp. originator Emond, A.M. originator Graham, G.R.C. originator https://doi.org/10.14509/29412 Geophysical Report GPR 2015-5 11 p 2015-01-01 Source Contribution: Data compilation and processingSource Type: digital data Black Mountain electromagnetic and magnetic airborne geophysical survey data compilation 2019-01-01 publication Alaska Division of Geological & Geophysical Surveys Fairbanks Alaska, United States publisher Burns, L.E. originator Graham, G.R.C. originator Barefoot, J.D. originator Fugro Airborne Surveys Corp. originator Stevens Exploration Management Corp. originator https://doi.org/10.14509/29756 Geophysical Report GPR 2018-3 12 p 2019-01-01 Source Contribution: Data compilation and processingSource Type: digital data East Richardson electromagnetic and magnetic airborne geophysical survey data compilation 2019-01-01 publication Alaska Division of Geological & Geophysical Surveys Fairbanks Alaska, United States publisher Burns, L.E. originator Graham, G.R.C. originator Barefoot, J.D. originator Fugro Airborne Surveys Corp. originator Stevens Exploration Management Corp. originator https://doi.org/10.14509/29754 Geophysical Report GPR 2018-1 12 p 2019-01-01 Source Contribution: Data compilation and processingSource Type: digital data Fairbanks electromagnetic and magnetic airborne geophysical survey data compilation 2019-01-01 publication Alaska Division of Geological & Geophysical Surveys Fairbanks Alaska, United States publisher Burns, L.E. originator Graham, G.R.C. originator Barefoot, J.D. originator Woods, Rebecca-Ellen originator Dighem originator WGM, Inc. originator Fugro Airborne Surveys originator Stevens Exploration Management Corp. originator https://doi.org/10.14509/30230 Geophysical Report GPR 2019-18 13 p 2019-01-01 Source Contribution: Data compilation and processingSource Type: digital data Goodpaster electromagnetic and magnetic airborne geophysical survey data compilation 2019-01-01 publication Alaska Division of Geological & Geophysical Surveys Fairbanks Alaska, United States publisher Burns, L.E. originator Barefoot, J.D. originator Naibert, T.J. originator Fugro Airborne Surveys Corp. originator Stevens Exploration Management Corp. originator https://doi.org/10.14509/29813 Geophysical Report GPR 2018-4 3 p 2019-01-01 Source Contribution: Data compilation and processingSource Type: digital data Liscum electromagnetic and magnetic airborne geophysical survey data compilation 2019-01-01 publication Alaska Division of Geological & Geophysical Surveys Fairbanks Alaska, United States publisher Burns, L.E. originator Graham, G.R.C. originator Barefoot, J.D. originator Fugro Airborne Surveys Corp. originator Stevens Exploration Management Corp. originator https://doi.org/10.14509/29755 Geophysical Report GPR 2018-2 12 p 2019-01-01 Source Contribution: Data compilation and processingSource Type: digital data Northeast Fairbanks electromagnetic and magnetic airborne geophysical survey data compilation 2019-01-01 publication Alaska Division of Geological & Geophysical Surveys Fairbanks Alaska, United States publisher Burns, L.E. originator Graham, G.R.C. originator Barefoot, J.D. originator Fugro Airborne Surveys originator Stevens Exploration Management Corp. originator https://doi.org/10.14509/30062 Geophysical Report GPR 2018-11 12 p 2019-01-01 Source Contribution: Data compilation and processingSource Type: digital data Salcha River-Pogo electromagnetic, magnetic, and radiometric airborne geophysical survey data compilation 2019-01-01 publication Alaska Division of Geological & Geophysical Surveys Fairbanks Alaska, United States publisher Burns, L.E. originator Barefoot, J.D. originator Graham, G.R.C. originator Naibert, T.J. originator Geoterrex-Dighem originator Stevens Exploration Management Corp. originator https://doi.org/10.14509/30179 Geophysical Report GPR 2019-8 22 p 2019-01-01 Source Contribution: Data compilation and processingSource Type: digital data Southeastern extension of Salcha River-Pogo electromagnetic and magnetic airborne geophysical survey data compilation 2019-01-01 publication Alaska Division of Geological & Geophysical Surveys Fairbanks Alaska, United States publisher Burns, L.E. originator Graham, G.R.C. originator Barefoot, J.D. originator Naibert, T.J. originator Fugro Airborne Surveys Corp. originator Stevens Exploration Management Corp. originator https://doi.org/10.14509/30185 Geophysical Report GPR 2019-9 12 p 2019-01-01 Source Contribution: Data compilation and processingSource Type: digital data Alaska Highway corridor electromagnetic and magnetic airborne geophysical survey data compilation 2020-01-01 publication Alaska Division of Geological & Geophysical Surveys Fairbanks Alaska, United States publisher Burns, L.E. originator Graham, G.R.C. originator Emond, A.M. originator Stevens Exploration Management Corp. originator Fugro Airborne Surveys originator https://doi.org/10.14509/30462 Geophysical Report GPR 2020-15 17 p 2020-01-01 Source Contribution: Data compilation and processingSource Type: digital data Headwaters of the Little Chena River electromagnetic and magnetic airborne geophysical survey data compilation 2020-01-01 publication Alaska Division of Geological & Geophysical Surveys Fairbanks Alaska, United States publisher Burns, L.E. originator Graham, G.R.C. originator Barefoot, J.D. originator Woods, Rebecca-Ellen originator Dighem originator McConnell, D.L. originator WGM, Inc. originator Stevens Exploration Management Corp. originator Fugro Airborne Surveys Corp. originator https://doi.org/10.14509/30418 Geophysical Report GPR 2020-4 12 p 2020-01-01 Source Contribution: Data compilation and processingSource Type: digital data Ladue electromagnetic and magnetic airborne geophysical survey data compilation 2020-01-01 publication Alaska Division of Geological & Geophysical Surveys Fairbanks Alaska, United States publisher Burns, L.E. originator Graham, G.R.C. originator Barefoot, J.D. originator Naibert, T.J. originator Fugro Airborne Surveys Corp. originator Fugro GeoServices, Inc. originator https://doi.org/10.14509/30261 Geophysical Report GPR 2019-20 15 p 2020-01-01 Source Contribution: Data compilation and processingSource Type: digital data Rampart-Manley electromagnetic and magnetic airborne geophysical survey data compilation 2020-01-01 publication Alaska Division of Geological & Geophysical Surveys Fairbanks Alaska, United States publisher Burns, L.E. originator Graham, G.R.C. originator Barefoot, J.D. originator Woods, Rebecca-Ellen originator Dighem originator Pritchard, R.A. originator WGM, Inc. originator Stevens Exploration Management Corp. originator Fugro Airborne Surveys Corp. originator https://doi.org/10.14509/30417 Geophysical Report GPR 2020-3 13 p 2020-01-01 Source Contribution: Data compilation and processingSource Type: digital data Richardson electromagnetic and magnetic airborne geophysical survey data compilation 2020-01-01 publication Alaska Division of Geological & Geophysical Surveys Fairbanks Alaska, United States publisher Burns, L.E. originator Graham, G.R.C. originator Barefoot, J.D. originator Woods, Rebecca-Ellen originator Dighem originator WGM, Inc. originator https://doi.org/10.14509/30263 Geophysical Report GPR 2019-22 12 p 2020-01-01 Source Contribution: Data compilation and processingSource Type: digital data Airborne magnetic geophysical survey of the Tanacross region, Alaska 2015-01-01 publication Alaska Division of Geological & Geophysical Surveys Fairbanks Alaska, United States publisher Emond, A.M. originator Saltus, R.W. originator Graham, G.R.C. originator Goldak Airborne Surveys originator https://doi.org/10.14509/29514 Geophysical Report GPR 2015-6 12 p 2015-01-01 Source Contribution: Data compilation and processingSource Type: digital data Airborne electromagnetic and magnetic survey, Goldstream Creek watershed, interior Alaska 2018-01-01 publication Alaska Division of Geological & Geophysical Surveys Fairbanks Alaska, United States publisher Emond, A.M. originator Daanen, R.P. originator Graham, G.R.C. originator Walter Anthony, Katey originator Liljedahl, A.K. originator Minsley, B.J. originator Barnes, D.L. originator Romanovsky, V.E. originator CGG Canada Services Ltd. originator https://doi.org/10.14509/29681 Geophysical Report GPR 2016-5 14 p 2018-01-01 Source Contribution: Data compilation and processingSource Type: digital data Airborne electromagnetic and magnetic survey, western Yukon Flats, interior Alaska 2018-01-01 publication Alaska Division of Geological & Geophysical Surveys Fairbanks Alaska, United States publisher Emond, A.M. originator Minsley, B.J. originator Daanen, R.P. originator Graham, G.R.C. originator CGG originator https://doi.org/10.14509/29683 Geophysical Report GPR 2016-2 3 p 2018-01-01 Source Contribution: Data compilation and processingSource Type: digital data Shaw Creek and Shawnee Peak airborne magnetic and radiometric geophysical survey 2020-01-01 publication Alaska Division of Geological & Geophysical Surveys Fairbanks Alaska, United States publisher Emond, A.M. originator MPX Geophysics LTD originator https://doi.org/10.14509/30551 Geophysical Report GPR 2020-16 2 p 2020-01-01 Source Contribution: Data compilation and processingSource Type: digital data Eagle airborne magnetic and radiometric geophysical survey 2021-01-01 publication Alaska Division of Geological & Geophysical Surveys Fairbanks Alaska, United States publisher Emond, A.M. originator MPX Geophysics LTD originator https://doi.org/10.14509/30755 Geophysical Report GPR 2021-2 4 p 2021-01-01 Source Contribution: Data compilation and processingSource Type: digital data White Mountains airborne magnetic and radiometric geophysical survey 2021-01-01 publication Alaska Division of Geological & Geophysical Surveys Fairbanks Alaska, United States publisher Emond, A.M. originator MPX Geophysics LTD originator https://doi.org/10.14509/30756 Geophysical Report GPR 2021-3 4 p 2021-01-01 Source Contribution: Data compilation and processingSource Type: digital data Tanana River and Big Delta airborne magnetic and radiometric survey 2022-01-01 publication Alaska Division of Geological & Geophysical Surveys Fairbanks Alaska, United States publisher Emond, A.M. originator MPX Geophysics LTD originator https://doi.org/10.14509/30899 Geophysical Report GPR 2022-1 4 p 2022-01-01 otherRestrictions 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. unknown This metadata was automatically generated from the FGDC Content Standard for Digital Geospatial Metadata standard (version FGDC-STD-001-1998) using the 2019-08-12T11:11:00 version of the FGDC CSDGM to ISO 19139 transform. Simone Montayne Alaska Division of Geological & Geophysical Surveys Metadata Manager (907)451-5020 (907)451-5050 3354 College Road Fairbanks AK 99709-3707 USA dggspubs@alaska.gov 8 am to 4:30 pm, Monday through Friday, except State holidays pointOfContact