Identification_Information: Citation: Citation_Information: Originator: Sicard, K.R. Originator: Naibert, T.J. Originator: Hubbard, T.D. Originator: Twelker, Evan Originator: Wypych, Alicja Originator: Werdon, M.B. Originator: Willingham, A.L. Originator: Gillis, R.J. Originator: Lande, L.L. Originator: Newberry, R.J. Publication_Date: 2017 Title: Geologic map of the Tok River area, Tanacross A-5 and A-6 quadrangles, eastern Alaska Range, Alaska Geospatial_Data_Presentation_Form: geodatabase Series_Information: Series_Name: Preliminary Interpretive Report Issue_Identification: PIR 2017-3 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 15 p., 1 sheet, scale 1:63,360 Online_Linkage: https://doi.org/10.14509/29722 Description: Abstract: Preliminary Interpretive Report PIR 2017-3, Geologic map of the Tok River area, Tanacross A-5 and A-6 quadrangles, eastern Alaska Range, Alaska, provides 1:63,360-scale geologic mapping of the bedrock units and surficial deposits in the Tok River area, Tanacross A-5 and A-6 quadrangles, eastern Alaska Range, Alaska. The Tok River geologic mapping project is part of a multi-year effort focusing on improving the publicly available geological and geochemical data and assessing the mineral potential of the Tanacross quadrangle. The project focused on detailed mapping, identification, sampling, and characterization of Devonian-Mississippian metamorphic rocks, Triassic and Cretaceous intrusions, surficial geology, and modern geochemical characterizations of skarn, vein, and volcanogenic massive sulfide (VMS) hosted mineralization. The DGGS Mineral Resources section spent 321 person-days in the field in 2015 and 2016 to conduct approximately 540 square miles of 1:63,360-scale geologic mapping and sampling in the Tok River area of central Alaska. The new geologic map improves understanding of the area's geology, structural history, and mineral potential. This area includes exposures of Devonian-Mississippian metamorphic rocks, metamorphosed Triassic gabbroic intrusions, and Cretaceous granodiorite intrusions and basaltic andesite lava flows. The area lies between the Delta mineral belt to the west, which has been the focus of exploration into VMS, and skarn deposits of the Tetlin project to the east. The area also contains numerous inactive and possibly active faults and multiple stages of deformation and magmatism, which are critical for understanding the geologic history of the eastern Alaska Range. The complete report, geodatabase, and ESRI fonts and style files are available from the DGGS website: http://doi.org/10.14509/29722. Purpose: The Tok River geologic mapping project is part of a multi-year effort focusing on improving the publicly available geological and geochemical data and assessing the mineral potential of the Tanacross quadrangle. The project focused on detailed mapping, identification, sampling, and characterization of Devonian-Mississippian metamorphic rocks, Triassic and Cretaceous intrusions, surficial geology, and modern geochemical characterizations of skarn, vein, and volcanogenic massive sulfide (VMS) hosted mineralization. The area lies between the Delta mineral belt to the west, which has been the focus of exploration into VMS, and skarn deposits of the Tetlin project to the east. The area also contains numerous inactive and possibly active faults and multiple stages of deformation and magmatism, which are critical for understanding the geologic history of the eastern Alaska Range. Supplemental_Information: This geodatabase is organized according to the AK GeMS mapping schema Hendricks, M.D., Ekberg, P.G., Athey, J.E., Wyatt, W.C., Willingham, A.L., and Naibert, T.J., 2021, AK GeMS data dictionary: A description of the Alaska geologic mapping schema: Alaska Division of Geological & Geophysical Surveys Miscellaneous Publication 170, 10 p. https://doi.org/10.14509/30669. The distribution package includes ESRI fonts and style files, along with usage instructions. Further documentation of the symbology is provided by Ekberg, P.G., Hendricks, M.D., and Athey, J.E., 2021, AK GeMS symbology: A description of the AK GeMS style file: Alaska Division of Geological & Geophysical Surveys Miscellaneous Publication 169, 7 p. https://doi.org/10.14509/30584 Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: 2015 Ending_Date: 2017 Currentness_Reference: ground condition Status: Progress: complete Maintenance_and_Update_Frequency: None planned Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -144.028172 East_Bounding_Coordinate: -142.984986 North_Bounding_Coordinate: 63.267395 South_Bounding_Coordinate: 62.981981 Keywords: Theme: Theme_Keyword_Thesaurus: ISO 19115 Topic Category Theme_Keyword: geoscientificInformation Theme: Theme_Keyword_Thesaurus: Alaska Division of Geological & Geophysical Surveys Theme_Keyword: Alluvium Theme_Keyword: Amphibolite Theme_Keyword: Arenite Theme_Keyword: Basalt Theme_Keyword: Bedrock Theme_Keyword: Bedrock Geologic Map Theme_Keyword: Bedrock Geology Theme_Keyword: Colluvium Theme_Keyword: Conglomerate Theme_Keyword: DGGS Theme_Keyword: Diorite Theme_Keyword: Dolomite Theme_Keyword: Engineering Theme_Keyword: Floodplain Theme_Keyword: GeMS Theme_Keyword: GeMS NCGMP09 Theme_Keyword: Gelifluction Theme_Keyword: Geologic Theme_Keyword: Geologic Map Theme_Keyword: Geologic Materials Theme_Keyword: Geological Process Theme_Keyword: Geology Theme_Keyword: Geomorphology Theme_Keyword: Glacial Theme_Keyword: Gneiss Theme_Keyword: Granodiorite Theme_Keyword: Graphite Theme_Keyword: Gravel Theme_Keyword: Greenschist Theme_Keyword: Greenstone Theme_Keyword: Hornblende Theme_Keyword: Igneous Theme_Keyword: Interpretation Theme_Keyword: Landslide Theme_Keyword: Marble Theme_Keyword: Metals Theme_Keyword: Metamorphic Theme_Keyword: Metamorphism Theme_Keyword: Mineral Deposit Theme_Keyword: Mineral Localities Theme_Keyword: Mineral Prospect Theme_Keyword: Mineral Resources Theme_Keyword: Minerals Theme_Keyword: Mining Theme_Keyword: Mining Claims Theme_Keyword: Mudstone Theme_Keyword: Orthogneiss Theme_Keyword: Outwash Theme_Keyword: Permafrost Theme_Keyword: Plutons Theme_Keyword: Porphyry Theme_Keyword: Quartzite Theme_Keyword: Rhyodacite Theme_Keyword: Rock Units Theme_Keyword: Rocks Theme_Keyword: STATEMAP Project Theme_Keyword: Sand Theme_Keyword: Sandstone Theme_Keyword: Schist Theme_Keyword: Siltstone Theme_Keyword: Skarn Theme_Keyword: Solifluction Theme_Keyword: Sulfides Theme_Keyword: Surface Theme_Keyword: Surficial Theme_Keyword: Surficial Geology Theme_Keyword: Talus Theme_Keyword: Thermokarst Theme_Keyword: Uplift Place: Place_Keyword_Thesaurus: Alaska Division of Geological & Geophysical Surveys Place_Keyword: Burnt Creek Place_Keyword: Burnt Lake Place_Keyword: Chistochina Mining District Place_Keyword: Clearwater Camp Place_Keyword: Clearwater Creek Place_Keyword: Dry Tok Creek Place_Keyword: Eagle Trail Wayside Place_Keyword: Kalutna River Place_Keyword: Little Tok River Place_Keyword: Log Cabin Creek Place_Keyword: Lost Creek Place_Keyword: Mentasta Lake Place_Keyword: Natohona Creek Place_Keyword: Shindata Creek Place_Keyword: Sikonsina Pass Place_Keyword: Station Creek Place_Keyword: Stibnite Creek Place_Keyword: Tanacross Place_Keyword: Tanacross Quadrangle Place_Keyword: Timber Creek Place_Keyword: Tok Place_Keyword: Tok Mining District Place_Keyword: Tok River Place_Keyword: Trail Creek Place_Keyword: White Creek Stratum: Stratum_Keyword_Thesaurus: Alaska Division of Geological & Geophysical Surveys Stratum_Keyword: Birch Creek Schist Stratum_Keyword: Cathedral Rapids Fault Stratum_Keyword: Delta Mineral Belt Stratum_Keyword: Hayes Glacier Belt Stratum_Keyword: Hona Pluton Stratum_Keyword: Macomb Subterrane Stratum_Keyword: Tok River Unit Temporal: Temporal_Keyword_Thesaurus: Walker, J.D., Geissman, J.W., Bowring, S.A, and Babcock, L.E., comp., 2012, Geologic Time Scale v. 4.0: Geological Society of America Temporal_Keyword: Devonian Temporal_Keyword: Early Cretaceous Temporal_Keyword: Late Cretaceous Temporal_Keyword: Late Jurassic Temporal_Keyword: Mississippian Temporal_Keyword: Quaternary Temporal_Keyword: Tertiary Temporal_Keyword: Triassic 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: This project was jointly funded by the State of Alaska's Strategic and Critical Minerals Assessment project (part of DGGS's Airborne Geophysical/Geological Mineral Inventory program [AGGMI]), a USGS Mineral Resources Assessment Grant G16AS00003, and the USGS National Cooperative Geologic Mapping Program, STATEMAP component, under award number G16AC00182 for 2016. The views and conclusions contained in this document are those of the authors and should not be interpreted as necessarily representing the official policies, either expressed or implied, of the U.S. Government. We acknowledge Heidi Lingenfelter and Joe Bovee representing Ahtna, Inc., James Mery of Doyon Limited, and Mentasta Village for providing access to private lands in the map area. U.S. Bureau of Land Management (BLM) Glennallen Field Office and Tom Beaucage of (BLM) Eastern Field Office (Fairbanks) assisted us with permitting on BLM-managed lands. We thank Lawrence K. Freeman, James V. Jones III, Erin Todd, Samuel Dashevsky, Peter Illig, and others for enlightening geological discussions. Lawrence Freeman and David Reioux participated in the 2015 fieldwork. Jeff Benowitz and Paul Layer of the University of Alaska Fairbanks Geochronology Lab conducted the 40Ar/39Ar analyses and assisted us in their interpretation. Dick Reger and Jennifer Athey gave timely and constructive technical reviews. We appreciate the warm hospitality and logistical support of John and Jill Rusyniak of Log Cabin Wilderness Lodge, and we thank Soloy Helicopters LLC pilots Sam Gawaith and Frank Ross for skilled and safe flying. Cross_Reference: Citation_Information: Originator: Naibert, T.J. Originator: Werdon, M.B. Originator: Lande, Lauren Originator: Wypych, Alicja Publication_Date: 2016 Title: Trace-element geochemical data from stream sediments collected in the Tok River area, Tanacross A-5 and A-6 quadrangles, Alaska in 2016 Series_Information: Series_Name: Raw Data File Issue_Identification: RDF 2016-10 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/10.14509/29688 Cross_Reference: Citation_Information: Originator: Twelker, Evan Originator: Freeman, L.K. Originator: Sicard, K.R. Originator: Busk, A.C. Publication_Date: 2016 Title: Preliminary report on mineral occurrences in the Tok River area, Alaska Series_Information: Series_Name: Preliminary Interpretive Report Issue_Identification: PIR 2016-2 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 7 p Online_Linkage: https://doi.org/10.14509/29605 Cross_Reference: Citation_Information: Originator: Twelker, Evan Originator: Newberry, R.J. Originator: Wypych, Alicja Originator: Sicard, K.R. Originator: Naibert, T.J. Publication_Date: 2018 Title: DGGS investigations of gold prospects in the Tok River area, eastern Alaska (presentation): Alaska Miners Association 26th Biennial Convention, Fairbanks, Alaska March 26-31, 2018 Series_Information: Series_Name: Poster and Presentation Issue_Identification: Twelker, Evan and others, 2018 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 31 p Online_Linkage: https://doi.org/10.14509/30030 Cross_Reference: Citation_Information: Originator: Twelker, Evan Originator: Newberry, R.J. Originator: Wypych, Alicja Originator: Sicard, K.R. Originator: Naibert, T.J. Publication_Date: 2020 Title: Mineral occurrences in the Tok River area, eastern Alaska Range Series_Information: Series_Name: Report of Investigation Issue_Identification: RI 2020-8 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 49 p Online_Linkage: https://doi.org/10.14509/30471 Data_Quality_Information: Attribute_Accuracy: Attribute_Accuracy_Report: Certainty in attribute interpretation varies throughout the map and is scale-dependent. Attribute fields within each feature class record the authors' degree of confidence in the existence or identity of applicable features. Logical_Consistency_Report: All polygon features were topologically validated according to specifications of the AK GeMS geologic mapping schema. Completeness_Report: This publication is released as a DGGS Preliminary Interpretive Report (PIR). A PIR is intended to provide timely release maps and reports with a preliminary interpretation of geology or analytical data. Several scientists familiar with the geology of map area have reviewed this publication for technical content. Positional_Accuracy: Horizontal_Positional_Accuracy: Horizontal_Positional_Accuracy_Report: Certainty in feature boundaries or location varies throughout the map. Data fields within each feature class and the accompanying orientation and location confidence lookup tables record the authors' degree of confidence in the location of applicable features. Lineage: Source_Information: Source_Citation: Citation_Information: Originator: Benowitz, J.A. Originator: Sicard, K.R. Originator: Naibert, T.J. Originator: Layer, P.W. Publication_Date: 2017 Title: 40Ar/39Ar data from the Tok River area, Tanacross A-5 and A-6 quadrangles and adjoining areas, eastern Alaska Range Series_Information: Series_Name: Raw Data File Issue_Identification: RDF 2017-5 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 26 p Online_Linkage: https://doi.org/10.14509/29727 Type_of_Source_Media: paper Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 2017 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: Benowitz, J.A. and others, 2017 Source_Contribution: Laboratory data compilation Source_Information: Source_Citation: Citation_Information: Originator: Dashevsky, S.S. Originator: Schaefer, C.F. Originator: Hunter, E.N. Publication_Date: 2003 Title: Bedrock geologic map of the Delta mineral belt, Tok mining district, Alaska Series_Information: Series_Name: Professional Report Issue_Identification: PR 122 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 122 p., 2 sheets, scale 1:63,360 Online_Linkage: https://doi.org/10.14509/2923 Source_Scale_Denominator: 63360 Type_of_Source_Media: paper Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 2003 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: Dashevsky, S.S. and others, 2003 Source_Contribution: Geologic map compilation Source_Information: Source_Citation: Citation_Information: Originator: Ekberg, P.G. Originator: Hendricks, M.D. Originator: Athey, J.E. Publication_Date: 2021 Title: AK GeMS symbology: A description of the AK GeMS style file Series_Information: Series_Name: Miscellaneous Publication Issue_Identification: MP 169 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 7 p Online_Linkage: https://doi.org/10.14509/30584 Type_of_Source_Media: paper Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 2021 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: Ekberg, P.G. and others, 2021 Source_Contribution: GIS analysis and digital cartography Source_Information: Source_Citation: Citation_Information: Originator: Emond, A.M. Originator: CGG Originator: Burns, L.E. Originator: Graham, G.R.C. Originator: CGG Land (US) Inc. Publication_Date: 2015 Title: Tok electromagnetic and magnetic airborne geophysical survey data compilation Series_Information: Series_Name: Geophysical Report Issue_Identification: GPR 2015-2 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Online_Linkage: https://doi.org/10.14509/29347 Type_of_Source_Media: paper 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: Geologic map compilation Source_Information: Source_Citation: Citation_Information: Originator: Foster, H.L. Publication_Date: 1970 Title: Reconnaissance geologic map of the Tanacross Quadrangle, Alaska Series_Information: Series_Name: Miscellaneous Geologic Investigations Map Issue_Identification: I 593 Publication_Information: Publication_Place: United States Publisher: U.S. Geological Survey Other_Citation_Details: 1 sheet, scale 1:250,000 Online_Linkage: https://dggs.alaska.gov/pubs/id/12871 Source_Scale_Denominator: 250000 Type_of_Source_Media: paper Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1970 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: Foster, H.L., 1970 Source_Contribution: Geologic map compilation Source_Information: Source_Citation: Citation_Information: Originator: French Space Agency Centre National d'Etudes Spatiales (CNES), SICORP, USA Publication_Date: 2013 Title: Alaska statewide SPOT imagery - CIR web map [basemap] Publication_Information: Publication_Place: Unknown Publisher: CNES Online_Linkage: https://www.geonorthis.com/AGCServices Type_of_Source_Media: paper Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 2013 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: French Space Agency Centre National d'Etudes Spatiales (CNES), SICORP, USA, 2013 Source_Contribution: Geologic map compilation Source_Information: Source_Citation: Citation_Information: Originator: Hendricks, M.D. Originator: Ekberg, P.G. Originator: Athey, J.E. Originator: Wyatt, W.C. Originator: Willingham, A.L. Originator: Naibert, T.J. Publication_Date: 2021 Title: AK GeMS data dictionary: A description of the Alaska geologic mapping schema Series_Information: Series_Name: Miscellaneous Publication Issue_Identification: MP 170 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 10 p Online_Linkage: https://doi.org/10.14509/30669 Type_of_Source_Media: paper Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 2021 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: Hendricks, M.D. and others, 2021 Source_Contribution: GIS analysis and digital cartography Source_Information: Source_Citation: Citation_Information: Originator: Holm-Denoma, C.S. Originator: Sicard, K.R. Originator: Twelker, Evan Publication_Date: 2020 Title: U-Pb geochronology of igneous and detrital zircon samples from the Tok River area, eastern Alaska Range, and Talkeetna Mountains, Alaska Series_Information: Series_Name: Raw Data File Issue_Identification: RDF 2020-3 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 20 p Online_Linkage: https://doi.org/10.14509/30439 Type_of_Source_Media: paper Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 2020 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: Holm-Denoma, C.S. and others, 2020 Source_Contribution: Laboratory data compilation Source_Information: Source_Citation: Citation_Information: Originator: Naibert, T.J. Originator: Werdon, M.B. Originator: Lande, Lauren Originator: Wypych, Alicja Publication_Date: 2016 Title: Trace-element geochemical data from stream sediments collected in the Tok River area, Tanacross A-5 and A-6 quadrangles, Alaska in 2016 Series_Information: Series_Name: Raw Data File Issue_Identification: RDF 2016-10 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/10.14509/29688 Type_of_Source_Media: paper Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 2016 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: Naibert, T.J. and others, 2016 Source_Contribution: Laboratory data compilation Source_Information: Source_Citation: Citation_Information: Originator: Neuendorf, K.K.E. Originator: Mehl, J.P., Jr. Originator: Jackson, J.A. Publication_Date: 2011 Title: Glossary of Geology Publication_Information: Publication_Place: Alexandria, Virginia Publisher: American Geological Institute Other_Citation_Details: 799 p Online_Linkage: https://www.americangeosciences.org/pubs/glossary Type_of_Source_Media: paper Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 2011 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: Neuendorf, K.K.E. and others, 2011 Source_Contribution: Geologic map compilation Source_Information: Source_Citation: Citation_Information: Originator: Nokleberg, W.J. Originator: Aleinikoff, J.N. Originator: Bond, G.C. Originator: Ferrians, O.J., Jr. Originator: Herzon, P.L. Originator: Lange, I.M. Originator: Miyaoka, R.T. Originator: Richter, D.H. Originator: Schwab, C.E. Originator: Silva, S.R. Originator: Smith, T.E. Originator: Zehner, R.E. Publication_Date: 2015 Title: Geologic maps of the eastern Alaska Range, Alaska (44 quadrangles, 1:63,360 scale), with descriptions and interpretations of map units Series_Information: Series_Name: Report of Investigation Issue_Identification: RI 2015-6 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 64 p., 45 sheets, scale 1:63,360 Online_Linkage: https://doi.org/10.14509/29444 Source_Scale_Denominator: 63360 Type_of_Source_Media: paper Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 2015 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: Nokleberg, W.J. and others, 2015 Source_Contribution: Geologic map compilation Source_Information: Source_Citation: Citation_Information: Originator: Richter, D.H. Publication_Date: 1976 Title: Geologic map of the Nabesna Quadrangle, Alaska Series_Information: Series_Name: Miscellaneous Investigations Series Map Issue_Identification: I 932 Publication_Information: Publication_Place: United States Publisher: U.S. Geological Survey Other_Citation_Details: 1 sheet, scale 1:250,000 Online_Linkage: https://dggs.alaska.gov/pubs/id/12873 Source_Scale_Denominator: 250000 Type_of_Source_Media: paper Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1976 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: Richter, D.H., 1976 Source_Contribution: Geologic map compilation Source_Information: Source_Citation: Citation_Information: Originator: Richter, D.H. Originator: Sharp, W.N. Originator: Dutro, J.T., Jr. Originator: Hamilton, W.B. Publication_Date: 1977 Title: Geologic map of parts of the Mount Hayes A-1 and A-2 quadrangles, Alaska Series_Information: Series_Name: Miscellaneous Investigations Series Map Issue_Identification: I 1031 Publication_Information: Publication_Place: United States Publisher: U.S. Geological Survey Other_Citation_Details: 1 sheet, scale 1:63,360 Online_Linkage: https://dggs.alaska.gov/pubs/id/12947 Source_Scale_Denominator: 63360 Type_of_Source_Media: paper Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1977 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: Richter, D.H. and others, 1977 Source_Contribution: Geologic map compilation Source_Information: Source_Citation: Citation_Information: Originator: Sicard, K.R. Originator: Naibert, T.J. Originator: Hubbard, T.D. Originator: Twelker, Evan Originator: Wypych, Alicja Originator: Werdon, M.B. Originator: Willingham, A.L. Originator: Gillis, R.J. Originator: Lande, L.L. Originator: Newberry, R.J. Publication_Date: 2017 Title: Geologic map of the Tok River area, Tanacross A-5 and A-6 quadrangles, eastern Alaska Range, Alaska Series_Information: Series_Name: Preliminary Interpretive Report Issue_Identification: PIR 2017-3 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 15 p., 1 sheet, scale 1:63,360 Online_Linkage: https://doi.org/10.14509/29722 Source_Scale_Denominator: 63360 Type_of_Source_Media: paper Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 2017 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: Sicard, K.R. and others, 2017 Source_Contribution: Geologic map compilation Source_Information: Source_Citation: Citation_Information: Originator: Wypych, Alicja Originator: Sicard, K.R. Originator: Gillis, R.J. Originator: Lande, L.L. Originator: Naibert, T.J. Originator: Newberry, R.J. Originator: Twelker, Evan Originator: Werdon, M.B. Originator: Willingham, A.L. Publication_Date: 2016 Title: Major-oxide and trace-element geochemical data from rocks collected in the Tok River area, Tanacross A-5 and A-6 quadrangles, Alaska in 2016 Series_Information: Series_Name: Raw Data File Issue_Identification: RDF 2016-9 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/10.14509/29685 Type_of_Source_Media: paper Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 2016 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: Wypych, Alicja and others, 2016 Source_Contribution: Laboratory data compilation Source_Information: Source_Citation: Citation_Information: Originator: Wypych, Alicja Originator: Sicard, K.R. Originator: Twelker, Evan Originator: Freeman, L.K. Originator: Lande, Lauren Originator: Reioux, D.A. Publication_Date: 2015 Title: Major-oxide and trace-element geochemical data from rocks collected in 2015 in the Tok area, Tanacross A-5, A-6, and parts of adjacent quadrangles, Alaska Series_Information: Series_Name: Raw Data File Issue_Identification: RDF 2015-15 v. 1.1 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/10.14509/29517 Type_of_Source_Media: paper Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 2015 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: Wypych, Alicja and others, 2015 Source_Contribution: Laboratory data compilation Process_Step: Process_Description: Bedrock geologic mapping - The DGGS Mineral Resources section spent 321 person-days in the field in 2015 and 2016 to conduct approximately 540 square miles of 1:63,360-scale geologic mapping and sampling in the Tok River area. Geologists observed details about the variations in texture, lithology, and orientation of the map units, collected rock samples, noted outcrop descriptions, and conducted structural measurements. Process_Date: 2016 Process_Step: Process_Description: Laboratory data compilation - Selected samples were submitted for geochronologic and geochemical analysis, and the results were used to interpret the stratigraphic and structural history of the map area. Source_Used_Citation_Abbreviation: Benowitz, J.A. and others, 2017 Source_Used_Citation_Abbreviation: Holm-Denoma, C.S. and others, 2020 Source_Used_Citation_Abbreviation: Naibert, T.J. and others, 2016 Source_Used_Citation_Abbreviation: Wypych, Alicja and others, 2016 Source_Used_Citation_Abbreviation: Wypych, Alicja and others, 2015 Process_Date: 2016 Process_Step: Process_Description: Geologic map compilation - Field observations were integrated with geophysical surveys of the area and with existing literature. Station locations for orientation measurements and rock samples were collected (WGS84 datum) using Trimble Juno T41/5 WAAS-enabled GPS devices running ArcGIS for Windows Mobile. Map unit boundaries and structures were initially compiled in an ArcGIS geodatabase using UTM Zone 7, NAD27 base maps and aerial photography. The geodatabase was transformed to UTM Zone 7, NAD83 prior to publication. Comparison of the originating GPS station coordinates and the transformed coordinates indicates that the transformation introduced systematic 2-3 meter positional discrepancies. The Stations table provides the originating GPS latitude and longitude coordinates (WGS84) for all field stations, which we consider to be more accurate. A subset of the orientation points were derived from Dashevsky and others, 2003; their positional accuracy is unknown. During final data organization and while attaching GPSX and GPSY coordinates, duplicate sample numbers in the STATIONS features were deleted if they were closer than 10 meters to each other. A number of stations had duplicate sample numbers and were further than 10 meters apart. In these cases, a decimal was added to the end of the sample number to distinguish them as different locations (i.e., added .1 or .2). In some cases, individual samples collected at a given station (outcrop) were erroneously assigned unique station numbers in the form of 16RN152A, 16RN152B. we corrected these station numbers to comply with DGGS 1:many station/sample numbering standards, example: 16RN152 (station number) and 16RN152A, 16RN152B (sample numbers). Geologic observations were finalized using the Alaska statewide SPOT imagery - CIR web map as the basemap. The map and report received technical review and editing by several scientists familiar with the subject matter. The authors incorporated the reviewers' suggestions into the final draft when deemed appropriate. Source_Used_Citation_Abbreviation: Dashevsky, S.S. and others, 2003 Source_Used_Citation_Abbreviation: Emond, A.M. and others, 2015 Source_Used_Citation_Abbreviation: Foster, H.L., 1970 Source_Used_Citation_Abbreviation: French Space Agency Centre National d'Etudes Spatiales (CNES), SICORP, USA, 2013 Source_Used_Citation_Abbreviation: Neuendorf, K.K.E. and others, 2011 Source_Used_Citation_Abbreviation: Nokleberg, W.J. and others, 2015 Source_Used_Citation_Abbreviation: Richter, D.H., 1976 Source_Used_Citation_Abbreviation: Richter, D.H. and others, 1977 Source_Used_Citation_Abbreviation: Sicard, K.R. and others, 2017 Process_Date: 2017 Process_Step: Process_Description: GIS analysis and digital cartography - This data distribution package's geologic and geographic features were organized and attributed according to the AK GeMS geologic mapping schema. The data were then programmatically transformed to provide download options in three formats: (1) an AK GeMS data package that includes the complete AK GeMS database and associated files, (2) a GeMS data package that is a conversion of the AK GeMS database into the base GeMS standard published by the USGS, and (3) a shapefile data package that includes two simple shapefile representations of the data. Source_Used_Citation_Abbreviation: Ekberg, P.G. and others, 2021 Source_Used_Citation_Abbreviation: Hendricks, M.D. and others, 2021 Process_Date: 2021 Spatial_Data_Organization_Information: Direct_Spatial_Reference_Method: vector Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Planar: Grid_Coordinate_System: Grid_Coordinate_System_Name: Universal Transverse Mercator Universal_Transverse_Mercator: UTM_Zone_Number: 7 Transverse_Mercator: Scale_Factor_at_Central_Meridian: 0.999600 Longitude_of_Central_Meridian: -141 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: NAD83 Ellipsoid_Name: GRS 80 Semi-major_Axis: 6378137 Denominator_of_Flattening_Ratio: 298.257222101000025 Entity_and_Attribute_Information: Detailed_Description: Entity_Type: Entity_Type_Label: tok_river_ak_gems_db_pkg Entity_Type_Definition: Geodatabase, layer files, style files, and fonts Entity_Type_Definition_Source: Alaska Division of Geological & Geophysical Surveys Entity_Attribute_Layer_Name: tok_river_ak_gems_db_pkg Detailed_Description: Entity_Type: Entity_Type_Label: tok_river_gems_db_pkg Entity_Type_Definition: Geodatabase, layer files, style files, and fonts Entity_Type_Definition_Source: Alaska Division of Geological & Geophysical Surveys Entity_Attribute_Layer_Name: tok_river_gems_db_pkg Detailed_Description: Entity_Type: Entity_Type_Label: tok_river_gems_shapefile_pkg Entity_Type_Definition: Shapefiles and open data files Entity_Type_Definition_Source: Alaska Division of Geological & Geophysical Surveys Entity_Attribute_Layer_Name: tok_river_gems_shapefile_pkg 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. Resource_Description: PIR 2017-3 Distribution_Liability: The State of Alaska makes no expressed or implied warranties (including warranties for merchantability and fitness) with respect to the character, functions, or capabilities of the electronic data or products or their appropriateness for any user's purposes. In no event will the State of Alaska be liable for any incidental, indirect, special, consequential, or other damages suffered by the user or any other person or entity whether from the use of the electronic services or products or any failure thereof or otherwise. In no event will the State of Alaska's liability to the Requestor or anyone else exceed the fee paid for the electronic service or product. Standard_Order_Process: Non-digital_Form: DGGS publications are available as free online downloads or you may purchase paper hard-copies or digital files on CD/DVD or other digital storage media by mail, phone, fax, or email from the DGGS Fairbanks office. To purchase this or other printed reports and maps, contact DGGS by phone (907-451-5020), e-mail (dggspubs@alaska.gov), or fax (907-451-5050). Payment accepted: Cash, check, money order, VISA, or MasterCard. Turnaround time is 1-2 weeks unless special arrangements are made and an express fee is paid. Shipping charge will be the actual cost of postage and will be added to the total amount due. Contact us for the exact shipping amount. Fees: Contact DGGS for current pricing Standard_Order_Process: Digital_Form: Digital_Transfer_Information: Format_Name: geodatabase Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: https://doi.org/10.14509/29722 Fees: Free download Metadata_Reference_Information: Metadata_Date: 20210828 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