Identification_Information: Citation: Citation_Information: Originator: Twelker, Evan Originator: Wildland, A.D. Originator: Werdon, M.B. Originator: Sicard, K.R. Originator: Wypych, Alicja Originator: Naibert, T.J. Originator: Athey, J.E. Originator: Willingham, A.L. Originator: Lockett, A.C. Publication_Date: 2021 Title: Preliminary bedrock geologic map database, northeastern Richardson mining district, Alaska Geospatial_Data_Presentation_Form: geodatabase Series_Information: Series_Name: Raw Data File Issue_Identification: RDF 2021-9 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/10.14509/30676 Description: Abstract: During the 2017 field season, geologists from the Alaska Division of Geological & Geophysical Surveys (DGGS) conducted geologic mapping and sampling of part of the Richardson mining district southeast of Fairbanks, Alaska. The project area is about 30 miles west of the Pogo gold mine and covers gold exploration activity at the Montecristo and Uncle Sam properties. This work aims to build an improved understanding of the area's geology and controls on gold mineralization for purposes of exploration targeting and mineral-resource assessment. The 260-square-mile map area lies between the Salcha River and Shaw Creek and is bounded by the Trans-Alaska Pipeline access road to the southwest. The area is characterized by forested, moderate-relief hills blanketed by vegetation, loess, and locally, sand dunes. Rock outcrop is less than one percent; consequently, the map interpretation relies heavily on the DGGS East Richardson airborne magnetic and electromagnetic survey as well as rocks collected from pits dug into rocky colluvial deposits below surficial loess or sand. The complete report, geodatabase, and ESRI fonts and style files are available from the DGGS website: http://doi.org/10.14509/30676. Purpose: This work aims to build an improved understanding of the area's geology and controls on gold mineralization for purposes of exploration targeting and mineral-resource assessment. 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: Single_Date/Time: Calendar_Date: 2017 Currentness_Reference: ground condition Status: Progress: complete Maintenance_and_Update_Frequency: None planned Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -146.376046 East_Bounding_Coordinate: -145.662557 North_Bounding_Coordinate: 64.555398 South_Bounding_Coordinate: 64.291956 Keywords: Theme: Theme_Keyword_Thesaurus: ISO 19115 Topic Category Theme_Keyword: geoscientificInformation Theme: Theme_Keyword_Thesaurus: Alaska Division of Geological & Geophysical Surveys Theme_Keyword: Amphibolite Theme_Keyword: Bedrock Theme_Keyword: Bedrock Geology Theme_Keyword: DGGS Theme_Keyword: Diorite Theme_Keyword: Economic Geology Theme_Keyword: Economic Study Theme_Keyword: Geologic Theme_Keyword: Geology Theme_Keyword: Gneiss Theme_Keyword: Granite Theme_Keyword: Igneous Theme_Keyword: Igneous Rocks Theme_Keyword: Metamorphic Theme_Keyword: Metamorphic Rocks Theme_Keyword: Metamorphism Theme_Keyword: Metasedimentary Rocks Theme_Keyword: Metavolcanic rocks Theme_Keyword: Migmatite Theme_Keyword: Mineral Assessment Theme_Keyword: Mineral Deposit Theme_Keyword: Mineral Development Theme_Keyword: Mineral Localities Theme_Keyword: Mineral Prospect Theme_Keyword: Mineral Resources Theme_Keyword: Minerals Theme_Keyword: Mining Theme_Keyword: Ore Deposit Theme_Keyword: Ores Theme_Keyword: Orthogneiss Theme_Keyword: Pegmatite Theme_Keyword: Plutonic Theme_Keyword: Plutonic Rocks Theme_Keyword: Plutons Theme_Keyword: Porphyry Theme_Keyword: Precious Metals Theme_Keyword: Prospecting Sites Theme_Keyword: Quartzite Theme_Keyword: Resource Assessment Theme_Keyword: Resource Information Theme_Keyword: Resources Theme_Keyword: Rock Units Theme_Keyword: Rocks Theme_Keyword: Schist Theme_Keyword: Serpentinite Theme_Keyword: Structure Place: Place_Keyword_Thesaurus: Alaska Division of Geological & Geophysical Surveys Place_Keyword: Alaska Place_Keyword: Caribou Creek Place_Keyword: Fairbanks Mining District Place_Keyword: Flat Creek Place_Keyword: Gilles Creek Place_Keyword: Gold Run Creek Place_Keyword: Keystone Creek Place_Keyword: Lenant Creek Place_Keyword: McCoy Creek Place_Keyword: Minton Creek Place_Keyword: Monte Cristo Creek Place_Keyword: Ninetyeight Creek Place_Keyword: Richardson Mining District Place_Keyword: Rosa Creek Place_Keyword: Salcha River Place_Keyword: Twentyfive Mile Creek Place_Keyword: Uncle Sam Creek 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: Cretaceous Temporal_Keyword: Devonian Temporal_Keyword: Early Cretaceous Temporal_Keyword: Late Cretaceous Temporal_Keyword: Mississippian Temporal_Keyword: Proterozoic 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: We thank Dennis McDowell and Pat Smith of Great American Minerals Exploration (GAME) and Bill Cronk and Northern Empire Resources Corp. for sharing data and insights on the district. Thanks also to Richard Lessard, Rainer Newberry, and Dave Larimer for geological discussions. Sumitomo Metal Mining Pogo provided access to the Pogo mine road, and Alyeska Pipeline Service Company granted access to the pipeline right of way. This project was funded by the State of Alaska. Cross_Reference: Citation_Information: Originator: Graham, G.E. Originator: Jozwik, Diana Publication_Date: 2007 Title: Data tables related to geology and gold mineralization in the Richardson district, east-central Alaska Series_Information: Series_Name: Raw Data File Issue_Identification: RDF 2007-2 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 32 p Online_Linkage: https://doi.org/10.14509/15819 Cross_Reference: Citation_Information: Originator: Naibert, T.J. Originator: Benowitz, J.A. Originator: Wypych, Alicja Originator: Sicard, K.R. Originator: Twelker, Evan Publication_Date: 2018 Title: 40Ar/39Ar data from the Tanacross D-1 and D-2, Big Delta B-4 and B-5, and Mount Hayes A-6 quadrangles, Alaska Series_Information: Series_Name: Raw Data File Issue_Identification: RDF 2018-3 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/10.14509/30112 Cross_Reference: Citation_Information: Originator: Twelker, Evan Originator: Benowitz, J.A. Originator: Naibert, T.J. Publication_Date: 2020 Title: 40Ar/39Ar data from the Richardson mining district, Big Delta Quadrangle, Alaska Series_Information: Series_Name: Raw Data File Issue_Identification: RDF 2020-11 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/10.14509/30530 Cross_Reference: Citation_Information: Originator: Twelker, Evan Originator: Werdon, M.B. Originator: Sicard, K.R. Originator: Wypych, Alicja Originator: Naibert, T.J. Originator: Athey, J.E. Originator: Willingham, A.L. Originator: Lockett, A.C. Publication_Date: 2017 Title: Geologic mapping in the Richardson-Uncle Sam area, interior Alaska (presentation): Alaska Miners Association Annual Convention, Anchorage, Alaska, November 7-12, 2017 Series_Information: Series_Name: Poster and Presentation Issue_Identification: Twelker, Evan and others, 2017 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 37 p Online_Linkage: https://doi.org/10.14509/29811 Cross_Reference: Citation_Information: Originator: Twelker, Evan Originator: Wypych, Alicja Originator: Sicard, K.R. Originator: Naibert, T.J. Originator: Montayne, Simone Originator: Newberry, R.J. Originator: Wyatt, W.C. Publication_Date: 2018 Title: Major-oxide and trace-element geochemical data from rocks collected in the Richardson mining district, Big Delta Quadrangle, Alaska Series_Information: Series_Name: Raw Data File Issue_Identification: RDF 2018-6 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/10.14509/30119 Cross_Reference: Citation_Information: Originator: Twelker, Evan Originator: Wypych, Alicja Originator: Sicard, K.R. Originator: Naibert, T.J. Originator: Werdon, M.B. Originator: Athey, J.E. Originator: Willingham, A.L. Originator: Lockett, A.C. Publication_Date: 2017 Title: Major-oxide and trace-element geochemical data from rocks collected in the Richardson mining district, Big Delta Quadrangle, Alaska Series_Information: Series_Name: Raw Data File Issue_Identification: RDF 2017-11 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/10.14509/29779 Cross_Reference: Citation_Information: Originator: Twelker, Evan Originator: O'Sullivan, P.B. Publication_Date: 2021 Title: U-Pb zircon data and ages for bedrock samples from the Richardson mining district, Big Delta Quadrangle, Alaska Series_Information: Series_Name: Raw Data File Issue_Identification: RDF 2020-14 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/10.14509/30555 Data_Quality_Information: Attribute_Accuracy: Attribute_Accuracy_Report: Certainty in attribute interpretation varies throughout the map and is scale dependant. 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 Raw Data File (RDF). Reports in the RDF series present field data and analytical results with limited or no interpretation by DGGS staff or project collaborators. The report and accompanying data have been evaluated by project staff for general readability and logical consistency but have not undergone technical peer review. Information presented in this release is subject to change. 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: Burns, L.E. Originator: Fugro Airborne Surveys Corp. Originator: Stevens Exploration Management Corp. Publication_Date: 2006 Title: Line, grid, and vector data and plot files for the airborne geophysical survey data of parts of the east Richardson, Liscum, and Black Mountain areas, interior Alaska Series_Information: Series_Name: Geophysical Report Issue_Identification: GPR 2006-5 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 29 sheets, 1 DVD Online_Linkage: https://doi.org/10.14509/14531 Type_of_Source_Media: digital Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 2006 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: Burns, L.E. and others, 2006 Source_Contribution: Bedrock mapping Source_Information: Source_Citation: Citation_Information: Originator: Hendricks, M.D. Originator: Ekberg, P.G. Originator: Athey, J.E. Originator: Wyatt, W.C. Publication_Date: 2020 Title: AK GeMS data dictionary: A description of the AK GeMS database schema Series_Information: Series_Name: Miscellaneous Publication Issue_Identification: MP 168 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Online_Linkage: https://doi.org/10.14509/30583 Type_of_Source_Media: digital Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 2020 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: Hendricks, M.D. and others, 2020 Source_Contribution: GIS analysis and digital cartography 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: digital 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: GIS analysis and digital cartography Source_Information: Source_Citation: Citation_Information: Originator: U.S. Geological Survey, EROS Data Center Publication_Date: 2013 Title: IFSAR Orthorectified Radar Image (ORI) Alaska Publication_Information: Publication_Place: Sioux Falls, SD Publisher: U.S. Geological Survey Online_Linkage: https://doi.org/10.5066/F7CJ8CSF Type_of_Source_Media: digital Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 2013 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: U.S. Geological Survey, EROS Data Center, 2013 Source_Contribution: GIS analysis and digital cartography Source_Information: Source_Citation: Citation_Information: Originator: Walker, J.D. Originator: Geissman, J.W. Originator: Bowring, S.A. Originator: Babcock, L.E. Publication_Date: 2018 Title: Geologic Time Scale v. 5.0 Publication_Information: Publication_Place: Boulder, CO Publisher: Geological Society of America Online_Linkage: https://www.geosociety.org/documents/gsa/timescale/timescl.pdf Type_of_Source_Media: paper Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 2018 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: Walker, J.D. and others, 2018 Source_Contribution: GIS analysis and digital cartography Source_Information: Source_Citation: Citation_Information: Originator: Weber, F.R. Originator: Foster, H.L. Originator: Keith, T.E.C. Originator: Dusel-Bacon, Cynthia Publication_Date: 1978 Title: Preliminary geologic map of the Big Delta Quadrangle, Alaska Series_Information: Series_Name: Open-File Report Issue_Identification: OF 78-529-A 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/12411 Source_Scale_Denominator: 250000 Type_of_Source_Media: paper Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1978 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: Weber, F.R. and others, 1978 Source_Contribution: Bedrock mapping Process_Step: Process_Description: Bedrock mapping - During the 2017 field season, DGGS geologists conducted geologic mapping and sampling of part of the Richardson mining district southeast of Fairbanks, Alaska. Rock outcrop is less than one percent; consequently, the map interpretation relies heavily on the DGGS East Richardson airborne magnetic and electromagnetic survey as well as rocks collected from pits dug into rocky colluvial deposits below surficial loess or sand. Location data for outcrop observations were collected using GPS-enabled tablets running the ESRI Collector App. Geologic unit identification Source_Used_Citation_Abbreviation: Burns, L.E. and others, 2006 Source_Used_Citation_Abbreviation: Weber, F.R. and others, 1978 Process_Date: 2017 Process_Step: Process_Description: GIS analysis and digital cartography - The geologic and geographic features portrayed in this data distribution package were organized and attributed according to the AK GeMS geologic mapping schema. Source_Used_Citation_Abbreviation: Hendricks, M.D. and others, 2020 Source_Used_Citation_Abbreviation: Neuendorf, K.K.E. and others, 2011 Source_Used_Citation_Abbreviation: U.S. Geological Survey, EROS Data Center, 2013 Source_Used_Citation_Abbreviation: Walker, J.D. and others, 2018 Process_Date: 2021 Process_Step: Process_Description: Technical review - The report and accompanying data were evaluated by project staff for general readability and logical consistency but have not undergone technical peer review. 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: 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: 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: richardson_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: richardson_ak_gems_db_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: RDF 2021-9 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/10.14509/30676 Fees: Free download Metadata_Reference_Information: Metadata_Date: 20210630 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