Identification_Information: Citation: Citation_Information: Originator: Murchek, J.T. Originator: Drenth, B.J. Originator: Emond, A.M. Publication_Date: 2024 Title: Yukon-Tanana Upland airborne magnetic geophysical data merge, version 2023 Geospatial_Data_Presentation_Form: digital, data Series_Information: Series_Name: Digital Data Series Issue_Identification: DDS 12-1 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 8 p. Online_Linkage: https://doi.org/10.14509/31157 Description: Abstract: 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. Purpose: 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. Supplemental_Information: >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. Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: 2015 Ending_Date: 2023 Currentness_Reference: ground condition Status: Progress: Complete Maintenance_and_Update_Frequency: None planned Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -151.746048 East_Bounding_Coordinate: -140.082083 North_Bounding_Coordinate: 66.007087 South_Bounding_Coordinate: 62.469149 Keywords: Theme: Theme_Keyword_Thesaurus: ISO 19115 Topic Category Theme_Keyword: geoscientificInformation Theme: Theme_Keyword_Thesaurus: Alaska Division of Geological & Geophysical Surveys Theme_Keyword: Airborne Geophysical Survey Theme_Keyword: DGGS Theme_Keyword: Electromagnetic Data Theme_Keyword: Electromagnetic Survey Theme_Keyword: Geologic Theme_Keyword: Geology Theme_Keyword: Geophysical Map Theme_Keyword: Geophysical Survey Theme_Keyword: Geophysics Theme_Keyword: Geophysics Search Tag Theme_Keyword: Magnetic Data Theme_Keyword: Magnetic Survey Theme_Keyword: Magnetics Place: Place_Keyword_Thesaurus: Alaska Division of Geological & Geophysical Surveys Place_Keyword: Alcan Place_Keyword: Badger Place_Keyword: Big Delta Place_Keyword: Black Mining District Place_Keyword: Bonnifield Mining District Place_Keyword: Central Place_Keyword: Charley River Place_Keyword: Charlieskin Village Place_Keyword: Chatanika Place_Keyword: Chatanika River Place_Keyword: Chena Hot Springs Place_Keyword: Chena River Place_Keyword: Chickaloon Place_Keyword: Chicken Place_Keyword: Chisana Mining District Place_Keyword: Chisana River Place_Keyword: Circle Hot Springs Place_Keyword: Circle Mining District Place_Keyword: College Place_Keyword: Dalton Highway Place_Keyword: Delta Junction Place_Keyword: Delta River Place_Keyword: Delta River Mining District Place_Keyword: Dot Lake Place_Keyword: Dot Lake Village Place_Keyword: Dry Creek Place_Keyword: Eagle Place_Keyword: Eagle Mining District Place_Keyword: Eagle Village Place_Keyword: Elliot Highway Place_Keyword: Ester Place_Keyword: Eureka Place_Keyword: Fairbanks Place_Keyword: Fairbanks Mining District Place_Keyword: Flume Creek Place_Keyword: Fortymile River Place_Keyword: Fox Place_Keyword: Gerstle River Place_Keyword: Goodpaster Mining District Place_Keyword: Goodpaster River Place_Keyword: Harding Lake Place_Keyword: Healy Lake Place_Keyword: Healy River Place_Keyword: Hot Springs Mining District Place_Keyword: Johnson River Place_Keyword: Kalukna River Place_Keyword: Kalutna River Place_Keyword: Kantishna Mining District Place_Keyword: Kantishna River Place_Keyword: Kathakne Place_Keyword: Kechumstuk Place_Keyword: Ladue River Place_Keyword: Little Chena River Place_Keyword: Livengood Place_Keyword: Manley Hot Springs Place_Keyword: Mansfield Village Place_Keyword: Miller House Place_Keyword: Minto Place_Keyword: Moose Creek Place_Keyword: Nabesna River Place_Keyword: Nabesna Village Place_Keyword: North Pole Place_Keyword: Northway Place_Keyword: Northway Junction Place_Keyword: Northway Village Place_Keyword: Pleasant Valley Place_Keyword: Rampart Mining District Place_Keyword: Richardson Place_Keyword: Richardson Highway Place_Keyword: Robertson River Place_Keyword: Salcha River Place_Keyword: Seventymile River Place_Keyword: Sixtymile River Place_Keyword: Tanacross Place_Keyword: Tanana River Place_Keyword: Tatalina River Place_Keyword: Tatlanika River Place_Keyword: Taylor Highway Place_Keyword: Tetlin Junction Place_Keyword: Tetlin River Place_Keyword: Tofty Place_Keyword: Tok Place_Keyword: Tok Mining District Place_Keyword: Tok River Place_Keyword: Tolovana Place_Keyword: Tolovana Mining District Place_Keyword: Tolovana River Place_Keyword: Totatlanika River Place_Keyword: Two Rivers Place_Keyword: Volkmar River Place_Keyword: Wood River Place_Keyword: Yukon River Place_Keyword: Zitziana River Stratum: Stratum_Keyword_Thesaurus: Alaska Division of Geological & Geophysical Surveys Stratum_Keyword: Kandik Group Stratum_Keyword: Neruokpuk Quartzite Stratum_Keyword: Wickersham Grit Stratum_Keyword: Wickersham Unit Stratum_Keyword: Yukon-Tanana Terrane Stratum_Keyword: Yukon-Tanana Upland Access_Constraints: This report, map, and/or dataset is available directly from the State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys (see contact information below). Use_Constraints: Any hard copies or published datasets utilizing these datasets shall clearly indicate their source. If the user has modified the data in any way, the user is obligated to describe the types of modifications the user has made. The user specifically agrees not to misrepresent these datasets, nor to imply that changes made by the user were approved by the State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys. The State of Alaska makes no express or implied warranties (including warranties for merchantability and fitness) with respect to the character, functions, or capabilities of the electronic data or products or their appropriateness for any user's purposes. In no event will the State of Alaska be liable for any incidental, indirect, special, consequential, or other damages suffered by the user or any other person or entity whether from the use of the electronic services or products or any failure thereof or otherwise. In no event will the State of Alaska's liability to the Requestor or anyone else exceed the fee paid for the electronic service or product. Point_of_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: Alaska Division of Geological & Geophysical Surveys Contact_Position: Metadata Manager Contact_Address: Address_Type: mailing and physical Address: 3354 College Road City: Fairbanks State_or_Province: AK Postal_Code: 99709-3707 Country: USA Contact_Voice_Telephone: (907)451-5020 Contact_Facsimile_Telephone: (907)451-5050 Contact_Electronic_Mail_Address: dggspubs@alaska.gov Hours_of_Service: 8 am to 4:30 pm, Monday through Friday, except State holidays Contact_Instructions: Please view our website (https://www.dggs.alaska.gov) for the latest information on available data. Please contact us using the e-mail address provided above when possible. Data_Set_Credit: 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. Cross_Reference: Citation_Information: Originator: Geological Survey of Canada Originator: U.S. Geological Survey Publication_Date: 2015 Title: Yukon - eastern Alaska magnetic grid Publication_Information: Publication_Place: Canada Publisher: Natural Resources Canada Online_Linkage: http://gdr.agg.nrcan.gc.ca/gdrdap/dap/index-eng.php?productid=1587 Data_Quality_Information: Attribute_Accuracy: Attribute_Accuracy_Report: All 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. Logical_Consistency_Report: These data originate from multiple similar geophysical surveys with different specifications. Reference the metadata of each originating survey for exact specifications. Completeness_Report: 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. Positional_Accuracy: Horizontal_Positional_Accuracy: 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. Lineage: Source_Information: Source_Citation: Citation_Information: Originator: Burns, L.E. Originator: Geoterrex-Dighem Originator: Stevens Exploration Management Corp. Originator: Emond, A.M. Originator: Graham, G.R.C. Publication_Date: 2015 Title: Fortymile mining district electromagnetic and magnetic airborne geophysical survey data compilation Series_Information: Series_Name: Geophysical Report Issue_Identification: GPR 2015-4 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 12 p Online_Linkage: https://doi.org/10.14509/29411 Type_of_Source_Media: digital data Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 2015 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: Burns, L.E. and others, 2015 Source_Contribution: Data compilation and processing Source_Information: Source_Citation: Citation_Information: Originator: Burns, L.E. Originator: Geoterrex-Dighem Originator: Stevens Exploration Management Corp. Originator: Emond, A.M. Originator: Graham, G.R.C. Publication_Date: 2015 Title: Livengood mining district electromagnetic and magnetic airborne geophysical survey data compilation Series_Information: Series_Name: Geophysical Report Issue_Identification: GPR 2015-5 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 11 p Online_Linkage: https://doi.org/10.14509/29412 Type_of_Source_Media: digital data Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 2015 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: Burns, L.E. and others, 2015 Source_Contribution: Data compilation and processing Source_Information: Source_Citation: Citation_Information: Originator: Burns, L.E. Originator: Graham, G.R.C. Originator: Barefoot, J.D. Originator: Fugro Airborne Surveys Corp. Originator: Stevens Exploration Management Corp. Publication_Date: 2019 Title: Black Mountain electromagnetic and magnetic airborne geophysical survey data compilation Series_Information: Series_Name: Geophysical Report Issue_Identification: GPR 2018-3 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 12 p Online_Linkage: https://doi.org/10.14509/29756 Type_of_Source_Media: digital data Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 2019 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: Burns, L.E. and others, 2019 Source_Contribution: Data compilation and processing Source_Information: Source_Citation: Citation_Information: Originator: Burns, L.E. Originator: Graham, G.R.C. Originator: Barefoot, J.D. Originator: Fugro Airborne Surveys Corp. Originator: Stevens Exploration Management Corp. Publication_Date: 2019 Title: East Richardson electromagnetic and magnetic airborne geophysical survey data compilation Series_Information: Series_Name: Geophysical Report Issue_Identification: GPR 2018-1 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 12 p Online_Linkage: https://doi.org/10.14509/29754 Type_of_Source_Media: digital data Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 2019 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: Burns, L.E. and others, 2019 Source_Contribution: Data compilation and processing Source_Information: Source_Citation: Citation_Information: Originator: 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. Publication_Date: 2019 Title: Fairbanks electromagnetic and magnetic airborne geophysical survey data compilation Series_Information: Series_Name: Geophysical Report Issue_Identification: GPR 2019-18 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 13 p Online_Linkage: https://doi.org/10.14509/30230 Type_of_Source_Media: digital data Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 2019 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: Burns, L.E. and others, 2019 Source_Contribution: Data compilation and processing Source_Information: Source_Citation: Citation_Information: Originator: Burns, L.E. Originator: Barefoot, J.D. Originator: Naibert, T.J. Originator: Fugro Airborne Surveys Corp. Originator: Stevens Exploration Management Corp. Publication_Date: 2019 Title: Goodpaster electromagnetic and magnetic airborne geophysical survey data compilation Series_Information: Series_Name: Geophysical Report Issue_Identification: GPR 2018-4 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 3 p Online_Linkage: https://doi.org/10.14509/29813 Type_of_Source_Media: digital data Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 2019 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: Burns, L.E. and others, 2019 Source_Contribution: Data compilation and processing Source_Information: Source_Citation: Citation_Information: Originator: Burns, L.E. Originator: Graham, G.R.C. Originator: Barefoot, J.D. Originator: Fugro Airborne Surveys Corp. Originator: Stevens Exploration Management Corp. Publication_Date: 2019 Title: Liscum electromagnetic and magnetic airborne geophysical survey data compilation Series_Information: Series_Name: Geophysical Report Issue_Identification: GPR 2018-2 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 12 p Online_Linkage: https://doi.org/10.14509/29755 Type_of_Source_Media: digital data Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 2019 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: Burns, L.E. and others, 2019 Source_Contribution: Data compilation and processing Source_Information: Source_Citation: Citation_Information: Originator: Burns, L.E. Originator: Graham, G.R.C. Originator: Barefoot, J.D. Originator: Fugro Airborne Surveys Originator: Stevens Exploration Management Corp. Publication_Date: 2019 Title: Northeast Fairbanks electromagnetic and magnetic airborne geophysical survey data compilation Series_Information: Series_Name: Geophysical Report Issue_Identification: GPR 2018-11 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 12 p Online_Linkage: https://doi.org/10.14509/30062 Type_of_Source_Media: digital data Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 2019 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: Burns, L.E. and others, 2019 Source_Contribution: Data compilation and processing Source_Information: Source_Citation: Citation_Information: Originator: Burns, L.E. Originator: Barefoot, J.D. Originator: Graham, G.R.C. Originator: Naibert, T.J. Originator: Geoterrex-Dighem Originator: Stevens Exploration Management Corp. Publication_Date: 2019 Title: Salcha River-Pogo electromagnetic, magnetic, and radiometric airborne geophysical survey data compilation Series_Information: Series_Name: Geophysical Report Issue_Identification: GPR 2019-8 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 22 p Online_Linkage: https://doi.org/10.14509/30179 Type_of_Source_Media: digital data Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 2019 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: Burns, L.E. and others, 2019 Source_Contribution: Data compilation and processing Source_Information: Source_Citation: Citation_Information: Originator: 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. Publication_Date: 2019 Title: Southeastern extension of Salcha River-Pogo electromagnetic and magnetic airborne geophysical survey data compilation Series_Information: Series_Name: Geophysical Report Issue_Identification: GPR 2019-9 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 12 p Online_Linkage: https://doi.org/10.14509/30185 Type_of_Source_Media: digital data Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 2019 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: Burns, L.E. and others, 2019 Source_Contribution: Data compilation and processing Source_Information: Source_Citation: Citation_Information: Originator: Burns, L.E. Originator: Graham, G.R.C. Originator: Emond, A.M. Originator: Stevens Exploration Management Corp. Originator: Fugro Airborne Surveys Publication_Date: 2020 Title: Alaska Highway corridor electromagnetic and magnetic airborne geophysical survey data compilation Series_Information: Series_Name: Geophysical Report Issue_Identification: GPR 2020-15 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 17 p Online_Linkage: https://doi.org/10.14509/30462 Type_of_Source_Media: digital data Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 2020 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: Burns, L.E. and others, 2020 Source_Contribution: Data compilation and processing Source_Information: Source_Citation: Citation_Information: Originator: 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. Publication_Date: 2020 Title: Headwaters of the Little Chena River electromagnetic and magnetic airborne geophysical survey data compilation Series_Information: Series_Name: Geophysical Report Issue_Identification: GPR 2020-4 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 12 p Online_Linkage: https://doi.org/10.14509/30418 Type_of_Source_Media: digital data Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 2020 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: Burns, L.E. and others, 2020 Source_Contribution: Data compilation and processing Source_Information: Source_Citation: Citation_Information: Originator: 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. Publication_Date: 2020 Title: Ladue electromagnetic and magnetic airborne geophysical survey data compilation Series_Information: Series_Name: Geophysical Report Issue_Identification: GPR 2019-20 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 15 p Online_Linkage: https://doi.org/10.14509/30261 Type_of_Source_Media: digital data Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 2020 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: Burns, L.E. and others, 2020 Source_Contribution: Data compilation and processing Source_Information: Source_Citation: Citation_Information: Originator: 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. Publication_Date: 2020 Title: Rampart-Manley electromagnetic and magnetic airborne geophysical survey data compilation Series_Information: Series_Name: Geophysical Report Issue_Identification: GPR 2020-3 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 13 p Online_Linkage: https://doi.org/10.14509/30417 Type_of_Source_Media: digital data Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 2020 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: Burns, L.E. and others, 2020 Source_Contribution: Data compilation and processing Source_Information: Source_Citation: Citation_Information: Originator: Burns, L.E. Originator: Graham, G.R.C. Originator: Barefoot, J.D. Originator: Woods, Rebecca-Ellen Originator: Dighem Originator: WGM, Inc. Publication_Date: 2020 Title: Richardson electromagnetic and magnetic airborne geophysical survey data compilation Series_Information: Series_Name: Geophysical Report Issue_Identification: GPR 2019-22 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 12 p Online_Linkage: https://doi.org/10.14509/30263 Type_of_Source_Media: digital data Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 2020 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: Burns, L.E. and others, 2020 Source_Contribution: Data compilation and processing Source_Information: Source_Citation: Citation_Information: Originator: Emond, A.M. Originator: Saltus, R.W. Originator: Graham, G.R.C. Originator: Goldak Airborne Surveys Publication_Date: 2015 Title: Airborne magnetic geophysical survey of the Tanacross region, Alaska Series_Information: Series_Name: Geophysical Report Issue_Identification: GPR 2015-6 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 12 p Online_Linkage: https://doi.org/10.14509/29514 Type_of_Source_Media: digital data Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 2015 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: Emond, A.M. and others, 2015 Source_Contribution: Data compilation and processing Source_Information: Source_Citation: Citation_Information: Originator: 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. Publication_Date: 2018 Title: Airborne electromagnetic and magnetic survey, Goldstream Creek watershed, interior Alaska Series_Information: Series_Name: Geophysical Report Issue_Identification: GPR 2016-5 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 14 p Online_Linkage: https://doi.org/10.14509/29681 Type_of_Source_Media: digital data Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 2018 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: Emond, A.M. and others, 2018 Source_Contribution: Data compilation and processing Source_Information: Source_Citation: Citation_Information: Originator: Emond, A.M. Originator: Minsley, B.J. Originator: Daanen, R.P. Originator: Graham, G.R.C. Originator: CGG Publication_Date: 2018 Title: Airborne electromagnetic and magnetic survey, western Yukon Flats, interior Alaska Series_Information: Series_Name: Geophysical Report Issue_Identification: GPR 2016-2 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 3 p Online_Linkage: https://doi.org/10.14509/29683 Type_of_Source_Media: digital data Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 2018 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: Emond, A.M. and others, 2018 Source_Contribution: Data compilation and processing Source_Information: Source_Citation: Citation_Information: Originator: Emond, A.M. Originator: MPX Geophysics LTD Publication_Date: 2020 Title: Shaw Creek and Shawnee Peak airborne magnetic and radiometric geophysical survey Series_Information: Series_Name: Geophysical Report Issue_Identification: GPR 2020-16 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 2 p Online_Linkage: https://doi.org/10.14509/30551 Type_of_Source_Media: digital data Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 2020 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: Emond, A.M. and MPX Geophysics LTD, 2020 Source_Contribution: Data compilation and processing Source_Information: Source_Citation: Citation_Information: Originator: Emond, A.M. Originator: MPX Geophysics LTD Publication_Date: 2021 Title: Eagle airborne magnetic and radiometric geophysical survey Series_Information: Series_Name: Geophysical Report Issue_Identification: GPR 2021-2 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 4 p Online_Linkage: https://doi.org/10.14509/30755 Type_of_Source_Media: digital data Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 2021 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: Emond, A.M. and MPX Geophysics LTD, 2021 Source_Contribution: Data compilation and processing Source_Information: Source_Citation: Citation_Information: Originator: Emond, A.M. Originator: MPX Geophysics LTD Publication_Date: 2021 Title: White Mountains airborne magnetic and radiometric geophysical survey Series_Information: Series_Name: Geophysical Report Issue_Identification: GPR 2021-3 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 4 p Online_Linkage: https://doi.org/10.14509/30756 Type_of_Source_Media: digital data Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 2021 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: Emond, A.M. and MPX Geophysics LTD, 2021 Source_Contribution: Data compilation and processing Source_Information: Source_Citation: Citation_Information: Originator: Emond, A.M. Originator: MPX Geophysics LTD Publication_Date: 2022 Title: Tanana River and Big Delta airborne magnetic and radiometric survey Series_Information: Series_Name: Geophysical Report Issue_Identification: GPR 2022-1 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 4 p Online_Linkage: https://doi.org/10.14509/30899 Type_of_Source_Media: digital data Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 2022 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: Emond, A.M. and MPX Geophysics LTD, 2022 Source_Contribution: Data compilation and processing Process_Step: Process_Description: 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. Source_Used_Citation_Abbreviation: Burns, L.E. and others, 2015 Source_Used_Citation_Abbreviation: Burns, L.E. and others, 2015 Source_Used_Citation_Abbreviation: Burns, L.E. and others, 2019 Source_Used_Citation_Abbreviation: Burns, L.E. and others, 2019 Source_Used_Citation_Abbreviation: Burns, L.E. and others, 2019 Source_Used_Citation_Abbreviation: Burns, L.E. and others, 2019 Source_Used_Citation_Abbreviation: Burns, L.E. and others, 2019 Source_Used_Citation_Abbreviation: Burns, L.E. and others, 2019 Source_Used_Citation_Abbreviation: Burns, L.E. and others, 2019 Source_Used_Citation_Abbreviation: Burns, L.E. and others, 2019 Source_Used_Citation_Abbreviation: Burns, L.E. and others, 2020 Source_Used_Citation_Abbreviation: Burns, L.E. and others, 2020 Source_Used_Citation_Abbreviation: Burns, L.E. and others, 2020 Source_Used_Citation_Abbreviation: Burns, L.E. and others, 2020 Source_Used_Citation_Abbreviation: Burns, L.E. and others, 2020 Source_Used_Citation_Abbreviation: Emond, A.M. and others, 2015 Source_Used_Citation_Abbreviation: Emond, A.M. and others, 2018 Source_Used_Citation_Abbreviation: Emond, A.M. and others, 2018 Source_Used_Citation_Abbreviation: Emond, A.M. and MPX Geophysics LTD, 2020 Source_Used_Citation_Abbreviation: Emond, A.M. and MPX Geophysics LTD, 2021 Source_Used_Citation_Abbreviation: Emond, A.M. and MPX Geophysics LTD, 2021 Source_Used_Citation_Abbreviation: Emond, A.M. and MPX Geophysics LTD, 2022 Process_Date: 2022 Spatial_Data_Organization_Information: Direct_Spatial_Reference_Method: raster Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Planar: Grid_Coordinate_System: Grid_Coordinate_System_Name: Universal Transverse Mercator Universal_Transverse_Mercator: UTM_Zone_Number: 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: WGS84 Ellipsoid_Name: WGS 84 Semi-major_Axis: 6378137 Denominator_of_Flattening_Ratio: 298.257223563 Entity_and_Attribute_Information: Detailed_Description: Entity_Type: Entity_Type_Label: ytu_merge_2023 Entity_Type_Definition: 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. Entity_Type_Definition_Source: Alaska Division of Geological & Geophysical Surveys (DGGS) and contractor. Entity_Attribute_Layer_Name: ytu_merge_2023 Distribution_Information: Distributor: Contact_Information: Contact_Organization_Primary: Contact_Organization: Alaska Division of Geological & Geophysical Surveys Contact_Position: Metadata Manager Contact_Address: Address_Type: mailing and physical Address: 3354 College Road City: Fairbanks State_or_Province: AK Postal_Code: 99709-3707 Country: USA Contact_Voice_Telephone: (907)451-5020 Contact_Facsimile_Telephone: (907)451-5050 Contact_Electronic_Mail_Address: dggspubs@alaska.gov Hours_of_Service: 8 am to 4:30 pm, Monday through Friday, except State holidays Contact_Instructions: Please view our website (https://www.dggs.alaska.gov) for the latest information on available data. Please contact us using the e-mail address provided above when possible. 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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: Geosoft format gridded data, ER Mapper format gridded data, ESRI ArcGIS shapefile, and keyhole markup language (.kml) data archive files Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: https://doi.org/10.14509/31157 Fees: Free download Metadata_Reference_Information: Metadata_Date: 20240507 Metadata_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: Alaska Division of Geological & Geophysical Surveys Contact_Person: Simone Montayne Contact_Position: Metadata Manager Contact_Address: Address_Type: mailing and physical Address: 3354 College Road City: Fairbanks State_or_Province: AK Postal_Code: 99709-3707 Country: USA Contact_Voice_Telephone: (907)451-5020 Contact_Facsimile_Telephone: (907)451-5050 Contact_Electronic_Mail_Address: dggspubs@alaska.gov Hours_of_Service: 8 am to 4:30 pm, Monday through Friday, except State holidays Metadata_Standard_Name: FGDC Content Standard for Digital Geospatial Metadata Metadata_Standard_Version: FGDC-STD-001-1998 Metadata_Use_Constraints: If the user has modified the data in any way they are obligated to describe the types of modifications they have performed in the supporting metadata file. User specifically agrees not to imply that changes they made were approved by the Alaska Department of Natural Resources or Division of Geological & Geophysical Surveys. Metadata_Extensions: Online_Linkage: https://dggs.alaska.gov/metadata/dggs.ext Profile_Name: dggs metadata extensions