Athey, J.E. Newberry, R.J. Werdon, M.B. Freeman, L.K. Smith, R.L. Szumigala, D.J. 2006 geodatabase Report of Investigation RI 2006-2 v. 1.0.1 Fairbanks, Alaska, United States Alaska Division of Geological & Geophysical Surveys 98 p., 1 sheet, scale 1:50,000 https://doi.org/10.14509/15026 Report of Investigation 2006-2 v. 1.0.1, Bedrock geologic map of the Liberty Bell area, Fairbanks A-4 Quadrangle, Bonnifield mining district, Alaska, provides bedrock geologic map of an approximately 131-square-mile area surrounding the Liberty Bell Mine. The geology of the Liberty Bell area, located in the northern Alaska Range foothills, comprises Devonian metasedimentary and meta-igneous rocks of the Totatlanika Schist and Keevy Peak formations, Cretaceous and Tertiary igneous rocks, and overlying unconsolidated Tertiary sedimentary rocks of the Usibelli Group and the younger Nenana Gravel. The complete report, geodatabase, and ESRI fonts and style files are available from the DGGS website: http://doi.org/10.14509/15026. The geologic map of the Liberty Bell mine area provides 1:50,000-scale geologic mapping of a portion of the Liberty Bell airborne geophysical survey area. The helicopter-based survey included aeromagnetic and electromagnetic data which were released by DGGS in 2002. The geophysical survey and geologic mapping are part of the Alaska Airborne Geophysical/Geological Mineral Inventory Program, a special multi-year investment by the State of Alaska to expand Alaska's geologic and mineral resources knowledge base, catalyze future private-sector mineral exploration and development, and guide state planning. 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 2005 2006 ground condition complete None planned -149.008974 -148.493298 64.131002 63.993979 ISO 19115 Topic Category geoscientificInformation Alaska Division of Geological & Geophysical Surveys 40Ar/39Ar Actinolite Age Dates Alluvial Analyses Apatite Arenite Arsenopyrite Basalt Bedrock Bedrock Geologic Map Bedrock Geology Chalcedony Chalcopyrite Chert Chlorite Clay Coal Conglomerate Diopside Diorite Epidote Feldspar Felsic Fluvial Folding Fracturing Garnet GeMS GeMS NCGMP09 Geochemical Data Geochronology Geologic Geologic Map Geology Gneiss Gold Granite Granodiorite Graphite Gravel Greenstone Hematite Hornblende Hornfels Igneous Igneous Rocks Iron Jasperoid Kaolinite Lignite Limestone Magnetite Metabasite Metamorphic Metamorphic Rocks Mica Mineral Development Mineral Exploration Mineral Resources Mineralogy Minerals Monazite Montmorillonite Mudstone Ore Orthogneiss Paleocurrent Palynology Pebble Petrography Plagioclase Plutonic Porphyry Pyrite Pyrrhotite Quartz Quartzite Rhyolite Rocks STATEMAP Project Sand Sandstone Scheelite Schist Sediment Sedimentary Sedimentary Rocks Sericite Shale Silt Siltstone Subbituminous Surface Talc Tourmaline Tremolite Tuff Uplift Volcanic Volcanic Rocks Zircon Alaska Division of Geological & Geophysical Surveys Bonanza Creek Bonnifield Mining District California Creek Chicken Creek Clarke Creek Coal Creek Cody Creek Daniels Creek Eagle Creek Elsie Creek Emma Creek Eva Creek Fairbanks Quadrangle Homestake Creek Iron Creek Jumbo Dome Liberty Bell Mine Lynx Creek Marguerite Creek Moose Creek Rex Creek Spruce Creek Steep Creek Totatlanika River Walker Creek Wilson Creek Windy Creek Winter Creek Alaska Division of Geological & Geophysical Surveys Healy Creek Formation Keevy Peak Formation Lignite Creek Formation Nenana Gravel Suntrana Formation Totatlanika Schist 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 Cretaceous Devonian Early Miocene Late Eocene Late Miocene Middle Miocene Paleozoic Pliocene Tertiary 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). 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. Alaska Division of Geological & Geophysical Surveys Metadata Manager mailing and physical

3354 College Road

Fairbanks AK 99709-3707 USA (907)451-5020 (907)451-5050 dggspubs@alaska.gov 8 am to 4:30 pm, Monday through Friday, except State holidays Please view our website (https://www.dggs.alaska.gov) for the latest information on available data. Please contact us using the e-mail address provided above when possible. This project is part of the Alaska Airborne Geophysical/Geological Mineral Inventory Program funded by the Alaska State Legislature and managed by State of Alaska, Department of Natural Resources (DNR), Division of Geological & Geophysical Surveys (DGGS). Partial funding for the geologic mapping, geochronologic dates, and geochemical analyses performed for this project was also provided through the U.S. Geological Survey STATEMAP Program under award number 05HQAG0025 and the State of Alaska's General Fund. Coal energy analyses were provided by the federal National Coal Resource Database System. Geologic map conversion to the GeMS standard was funded by the USGS National Cooperative Geologic Mapping Program under StateMap award number G20AC00367, 2020, 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. DGGS Staff Athey, J.E. 2006 Newsletter NL 2006-1 Fairbanks, Alaska, United States Alaska Division of Geological & Geophysical Surveys 10 p https://doi.org/10.14509/14596 This data release provides legacy geospatial data converted to the GeMS and AK GeMS specifications. Attribute fields within each feature class are populated using 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. All polygon features were topologically validated according to the AK GeMS geologic mapping schema specifications. This publication is part of a DGGS Report of Investigations (RI). An RI is the completed product of original research and analysis, and RIs use professional cartography and undergo rigorous peer review, editing, and revision. This data release provides legacy geospatial data converted to the GeMS and AK GeMS specifications. The data include descriptive fields within each feature class and accompanying orientation and location confidence lookup tables to record the originating authors' degree of confidence in the location of features. Certainty in feature boundaries or location varies throughout the map. Athey, J.E. Werdon, M.B. Newberry, R.J. Szumigala, D.J. Freeman, L.K. Lessard, R.R. 2005 Raw Data File RDF 2005-5 Fairbanks, Alaska, United States Alaska Division of Geological & Geophysical Surveys 29 p https://doi.org/10.14509/14444 paper 2005 publication date Athey, J.E. and others, 2005 Laboratory data compilation Ekberg, P.G. Hendricks, M.D. Athey, J.E. 2021 Miscellaneous Publication MP 169 Fairbanks, Alaska, United States Alaska Division of Geological & Geophysical Surveys 7 p https://doi.org/10.14509/30584 paper 2021 publication date Ekberg, P.G. and others, 2021 GIS analysis and digital cartography Fugro Airborne Surveys Stevens Exploration Management Corp. Burns, L.E. Graham, G.R.C. 2018 Geophysical Report GPR 2018-10 Fairbanks, Alaska, United States Alaska Division of Geological & Geophysical Surveys 12 p https://doi.org/10.14509/29690 paper 2018 publication date Fugro Airborne Surveys and others, 2018 Geologic mapping Hendricks, M.D. Ekberg, P.G. Athey, J.E. Wyatt, W.C. Willingham, A.L. Naibert, T.J. 2021 Miscellaneous Publication MP 170 Fairbanks, Alaska, United States Alaska Division of Geological & Geophysical Surveys 10 p https://doi.org/10.14509/30669 paper 2021 publication date Hendricks, M.D. and others, 2021 GIS analysis and digital cartography U.S. Geological Survey National Cooperative Geologic Mapping Program 2020 Techniques and Methods TM 11-B10 United States U.S. Geological Survey 1 p https://dggs.alaska.gov/pubs/id/30585 paper 2020 publication date U.S. Geological Survey National Cooperative Geologic Mapping Program, 2020 GIS analysis and digital cartography Geologic mapping - During the summer of 2005, DGGS conducted a three-week field mapping project to provide geologic ground truth for an airborne geophysical survey flown in the Liberty Bell area in 2001 (Burns and others, 2002). DGGS efforts are focused on determining the geologic framework of the Liberty Bell area, and its potential for hosting lode mineral deposits. Fieldwork for bedrock investigations, including ridge traverses and examination of riverbank exposures, was conducted for approximately 105 person-days during July 2005. Field notes and rock samples were collected at approximately 1,405 stations throughout the southern Fairbanks A-4 Quadrangle. Plots of an orthorectified air photo mosaic were used to find outcrops in the field and identify linear features that may have geologic significance. Plots of airborne magnetic and resistivity data (Burns and others, 2002) overlain with standard USGS raster topography were used daily in the field to help identify geologic contacts, units, and faults. At most field stations, magnetic susceptibility data were collected to help identify magnetic units. Bedrock mappers recorded observations on 1:50,000-scale topographic base maps of 15-minute quadrangles that were enlarged from a scale of 1:63,360. In the evenings, each geologist's observations were compiled onto a single Mylar base map. Field stations were located using handheld Garmin 12XL GPS units. Fugro Airborne Surveys and others, 2018 2005 Laboratory data compilation - Paleozoic rocks and younger, unmetamorphosed igneous rocks were primarily defined by chemical composition, examination of hand samples, and petrography. Approximately 280 samples were analyzed for major-and minor-oxide and trace elements by a commercial analytical laboratory and the University of Alaska Fairbanks. These data are used to suggest possible protoliths of metamorphosed and altered rocks, identify types of alteration, and assign trace-element indicated tectonic settings to igneous and meta-igneous rocks. Unit descriptions are also based on the petrographic examination and modal analysis of 169 thin sections. Six 40Ar/39Ar ages were used to constrain timing of igneous events, mineralization, and metamorphism in the Liberty Bell Mine area. The area coincides with a donut-shaped, aeromagnetic high. Tertiary units were differentiated by a combination of sand grain composition, clay composition, and palynology. Sixty grain mounts of Tertiary sand were point-counted in order to compare sand composition. Clay compositions were determined by X-ray diffraction for sixty-five samples of unconsolidated rock. Pollen was identified and counted in fifteen samples of fine-grained Tertiary sedimentary rock and coal. To evaluate the mineral-resource potential of the Liberty Bell area, 116 samples of visibly mineralized rock, or rock exhibiting features associated with mineralization, were analyzed for geochemical trace elements. To evaluate the energy-resource potential of the Liberty Bell area, twenty-one coal samples were analyzed for energy values (proximate and ultimate analyses, BTU, etc.) and trace-elements of their ash. The composition of a placer gold sample was determined by X-ray fluorescence. Athey, J.E. and others, 2005 2005 Geologic map compilation - The conceptual framework for the regional geology incorporates key ideas from preexisting literature. A comprehensive bibliographic reference list of prior work used to identify and delineate rock units and structural elements is provided in the accompanying report. 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. 2006 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. Ekberg, P.G. and others, 2021 Hendricks, M.D. and others, 2021 U.S. Geological Survey National Cooperative Geologic Mapping Program, 2020 2022 vector Universal Transverse Mercator 6 0.999600 -147 0 500000.000000 0 coordinate pair .00000001 .00000001 Meters NAD27 Clarke 1866 6378206.40000000037 294.978698199999997 liberty_bell_bedrock_ak_gems_db_pkg Geodatabase, layer files, style files, and fonts Alaska Division of Geological & Geophysical Surveys liberty_bell_bedrock_ak_gems_db_pkg liberty_bell_bedrock_gems_db_pkg Geodatabase, layer files, style files, and fonts Alaska Division of Geological & Geophysical Surveys liberty_bell_bedrock_gems_db_pkg liberty_bell_bedrock_gems_shapefile_pkg Shapefiles and open data files Alaska Division of Geological & Geophysical Surveys liberty_bell_bedrock_gems_shapefile_pkg Alaska Division of Geological & Geophysical Surveys Metadata Manager mailing and physical

3354 College Road

Fairbanks AK 99709-3707 USA (907)451-5020 (907)451-5050 dggspubs@alaska.gov 8 am to 4:30 pm, Monday through Friday, except State holidays Please view our website (https://www.dggs.alaska.gov) for the latest information on available data. Please contact us using the e-mail address provided above when possible. RI 2006-2 v. 1.0.1 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. 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. Contact DGGS for current pricing geodatabase https://doi.org/10.14509/15026 Free download 20220322 Alaska Division of Geological & Geophysical Surveys Simone Montayne Metadata Manager mailing and physical

3354 College Road

Fairbanks AK 99709-3707 USA (907)451-5020 (907)451-5050 dggspubs@alaska.gov 8 am to 4:30 pm, Monday through Friday, except State holidays FGDC Content Standard for Digital Geospatial Metadata FGDC-STD-001-1998 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. https://dggs.alaska.gov/metadata/dggs.ext dggs metadata extensions