Identification_Information: Citation: Citation_Information: Originator: Herreid, G.H. Publication_Date: 1966 Title: Geology and geochemistry of the Inmachuk River map area, Seward Peninsula, Alaska Geospatial_Data_Presentation_Form: geodatabase Series_Information: Series_Name: Geologic Report Issue_Identification: GR 23 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Mines and Minerals Other_Citation_Details: 27 p., 1 sheet, scale 1:63,360 Online_Linkage: https://doi.org/10.14509/352 Description: Abstract: Geology and geochemistry of the Inmachuk River map area, Seward Peninsula, Alaska, Geologic Report 23, presents a geological overview of the Inmachuk map area, a 110-square-mile region in Alaska's northern Seward Peninsula. Fieldwork was conducted from July 13 to July 31, 1965. Mineral deposits include lead-zinc lodes and placer gold near Hannum Creek, gossan zones to the southeast, and reported placer tin in nearby creeks. Additional placer gold occurs along the Inmachuk River, just east of the mapped area. The terrain consists of tundra-covered low hills underlain by schist, phyllite, and marble. A structural dome in the southern area exposes thick marble intruded by Mesozoic(?) granite. Mineralization includes marble-hosted pyrite-lead-zinc at Ear Mountain Creek and fault-controlled gossan zones with low metal values. Soil and stream sediment anomalies near Hannum Creek suggest detrital lead transport. Weak lead and tin anomalies on the dome's flanks may indicate bedrock sources, though no surface ore was found. The complete report, geodatabase, and ESRI fonts and style files are available from the Alaska Division of Geological & Geophysical Surveys website: http://doi.org/10.14509/352. Purpose: The geological investigation of the Inmachuk map area provides valuable insight into the mineral and geothermal resource potential of a remote, underexplored region in Alaska's Seward Peninsula. By identifying structural features, lithologic units, and geochemical anomalies, the study supports future exploration for lead, zinc, gold, and tin-resources that could benefit local economies and inform broader assessments across Arctic Alaska. This dual potential makes the Inmachuk area a strategic target for integrated resource evaluation and sustainable development planning. Supplemental_Information: This geodatabase is organized according to the AK GeMS mapping schema Hendricks, M.D., Macpherson, A.E., Athey, J.E., Wyatt, W.C., Montayne, Simone, Buchanan, Wes, Rivera, P.G., and Steinleitner, A.M., 2024, AK GeMS data dictionary: A description of the Alaska geologic mapping schema: Alaska Division of Geological & Geophysical Surveys Miscellaneous Publication 170 v. 2, 13 p. https://doi.org/10.14509/31172. 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: 1965 Currentness_Reference: ground condition Status: Progress: Complete Maintenance_and_Update_Frequency: As needed Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -163.411811 East_Bounding_Coordinate: -163.009405 North_Bounding_Coordinate: 65.963591 South_Bounding_Coordinate: 65.711347 Keywords: Theme: Theme_Keyword_Thesaurus: ISO 19115 Topic Category Theme_Keyword: geoscientificInformation Theme: Theme_Keyword_Thesaurus: Alaska Division of Geological & Geophysical Surveys Theme_Keyword: Basalt Theme_Keyword: Bedrock Theme_Keyword: Bedrock Geology Theme_Keyword: Copper Theme_Keyword: Dolomite Theme_Keyword: Enstatite Theme_Keyword: Folds Theme_Keyword: Fossils Theme_Keyword: GeMS DB L3 Compliant Theme_Keyword: GeMS DB v2 Theme_Keyword: Generalized Theme_Keyword: Geochemistry Theme_Keyword: Geologic Theme_Keyword: Geology Theme_Keyword: Geothermal Theme_Keyword: Gold Theme_Keyword: Granite Theme_Keyword: Hornfels Theme_Keyword: Hot Springs Theme_Keyword: Igneous Theme_Keyword: Intrusive Theme_Keyword: Lead Theme_Keyword: Marble Theme_Keyword: Metamorphic Theme_Keyword: Mineral Assessment Theme_Keyword: Mineral Deposit Theme_Keyword: Mineral Deposit Models Theme_Keyword: Mineral Exploration Theme_Keyword: Mineral Localities Theme_Keyword: Mineral Prospect Theme_Keyword: Mineral Resources Theme_Keyword: Mineral Spring Theme_Keyword: Minerals Theme_Keyword: Mining Theme_Keyword: Molybdenum Theme_Keyword: Nickel Theme_Keyword: Phyllite Theme_Keyword: Plutons Theme_Keyword: Replacement Theme_Keyword: Rocks Theme_Keyword: Schist Theme_Keyword: Silver Theme_Keyword: Soils Theme_Keyword: Spinel Theme_Keyword: Statistics Theme_Keyword: Stream Sediments Theme_Keyword: Structure Theme_Keyword: Tin Theme_Keyword: Tremolite Theme_Keyword: Volcanic Theme_Keyword: Zinc Place: Place_Keyword_Thesaurus: Alaska Division of Geological & Geophysical Surveys Place_Keyword: American Creek Place_Keyword: Black Butte Place_Keyword: Collins Creek Place_Keyword: Cottonwood Creek Place_Keyword: Crossfox Butte Place_Keyword: Cunningham Creek Place_Keyword: Eureka Creek Place_Keyword: Inmachuk Hot Springs Place_Keyword: June Creek Place_Keyword: Magnet Creek Place_Keyword: Nelson Creek Place_Keyword: Perry Creek Place_Keyword: Seward Peninsula Place_Keyword: Trail Creek Stratum: Stratum_Keyword_Thesaurus: Alaska Division of Geological & Geophysical Surveys Stratum_Keyword: American Creek Granite Stratum_Keyword: Asses Ears Granite 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: Mesozoic Temporal_Keyword: Paleozoic Temporal_Keyword: Quaternary Temporal_Keyword: Tertiary 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: Kinney Engineering, LLC staff used scanned and georeferenced paper maps to digitize geologic features into an AK GeMS database. Chris Wyatt conducted quality control of this digitizing work and completed the creation of the AK GeMS database. Ally M. Steinleitner implemented final database quality control and packaging. This geologic map (or report or conversion or product, etc.) was funded by the USGS National Cooperative Geologic Mapping Program under STATEMAP award number G23AC00584, 2023, and the State of Alaska General Fund. 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. Data_Quality_Information: Attribute_Accuracy: Attribute_Accuracy_Report: Attribute fields within each feature class are populated using the map symbology and corresponding applicable values from the GeMS and AK GeMS specifications. When known, certainty in attribute interpretation is indicated in the relevant fields. Attribute accuracy varies throughout the map and is scale-dependent. Logical_Consistency_Report: All polygon features were topologically validated according to the AK GeMS geologic mapping schema specifications. Completeness_Report: This publication is a DGGS Geologic Report (GR). A GR is the completed product of original research and analysis, and GRs use professional cartography and undergo rigorous peer review, editing, and revision. 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: 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: 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: U.S. Geological Survey National Cooperative Geologic Mapping Program Publication_Date: 2020 Title: GeMS (Geologic Map Schema) - A standard format for the digital publication of geologic maps Series_Information: Series_Name: Techniques and Methods Issue_Identification: TM 11-B10 Publication_Information: Publication_Place: United States Publisher: U.S. Geological Survey Other_Citation_Details: 1 p Online_Linkage: https://dggs.alaska.gov/pubs/id/30585 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: U.S. Geological Survey National Cooperative Geologic Mapping Program, 2020 Source_Contribution: GIS analysis and digital cartography Process_Step: Process_Description: Geologic mapping - Field investigations in the Inmachuk map area employed geologic mapping, structural analysis, and geochemical sampling to evaluate mineral resource potential. Bedrock exposures were studied with emphasis on identifying igneous and metamorphic units, particularly within a 2-by-8-mile structural dome where marble and granite intrusions suggest tectonic uplift. Structural features such as fold axes and axial planes were recorded to interpret deformation and guide mineralization analysis. Mineralized zones were assessed through visual inspection and limited sampling, though poor exposure hindered ore grade evaluation. Soil and stream sediment samples were analyzed for trace elements, revealing lead and tin anomalies associated with fault zones and marble-hosted replacements. These geochemical patterns helped delineate potential bedrock mineralization despite the absence of surface ore or float. Process_Date: 1965 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 legacy data were 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 Source_Used_Citation_Abbreviation: U.S. Geological Survey National Cooperative Geologic Mapping Program, 2020 Process_Date: 2025 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: 3 Transverse_Mercator: Scale_Factor_at_Central_Meridian: 0.999600 Longitude_of_Central_Meridian: -165 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: NAD27 Ellipsoid_Name: Clarke 1866 Semi-major_Axis: 6378206.4 Denominator_of_Flattening_Ratio: 294.9786982 Entity_and_Attribute_Information: Detailed_Description: Entity_Type: Entity_Type_Label: inmachuk_river_area_geo_ak_gems_db_pkg Entity_Type_Definition: Geodatabase, layer files, style files, and fonts Entity_Type_Definition_Source: DGGS and USGS Entity_Attribute_Layer_Name: inmachuk_river_area_geo_ak_gems_db_pkg Detailed_Description: Entity_Type: Entity_Type_Label: inmachuk_river_area_geo_gems_db_pkg Entity_Type_Definition: Geodatabase, layer files, style files, and fonts Entity_Type_Definition_Source: DGGS and USGS Entity_Attribute_Layer_Name: inmachuk_river_area_geo_gems_db_pkg Detailed_Description: Entity_Type: Entity_Type_Label: inmachuk_river_area_geo_gems_geopackage Entity_Type_Definition: SQLite Database file Entity_Type_Definition_Source: DGGS and USGS Entity_Attribute_Layer_Name: inmachuk_river_area_geo_gems_geopackage Detailed_Description: Entity_Type: Entity_Type_Label: inmachuk_river_area_geo_gems_shapefile_pkg Entity_Type_Definition: Shapefiles and open data files Entity_Type_Definition_Source: DGGS and USGS Entity_Attribute_Layer_Name: inmachuk_river_area_geo_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: GR 23 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 Format_Information_Content: geologic map Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: https://doi.org/10.14509/352 Fees: Free download Metadata_Reference_Information: Metadata_Date: 20251002 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