Identification_Information: Citation: Citation_Information: Originator: Moshrefzadeh, J.A. Originator: Barrera, M.L. Originator: Buchanan, J.W. Originator: Naibert, T.J. Originator: Newberry, R.J. Originator: Norwood, L.P. Originator: Regan, S.P. Originator: Szumigala, D.J. Originator: Twelker, Evan Originator: Walser, S.L. Originator: Wilson, K.R. Publication_Date: 2026 Title: Geochemical data from samples collected in 2025 for the Steese and Tolovana projects, Yukon-Tanana Upland, Alaska Geospatial_Data_Presentation_Form: data Series_Information: Series_Name: Raw Data File Issue_Identification: RDF 2026-20 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/10.14509/32140 Description: Abstract: Geochemical data from samples collected in 2025 for the Steese and Tolovana projects, Yukon-Tanana Upland, Alaska, Raw Data File 2026-20, presents major-oxide and trace-element geochemistry of igneous, metamorphic, and potentially mineralized rocks collected during DGGS' 2025 field season for the Steese and Tolovana projects as part of 1:100,000-scale bedrock geologic mapping within the Yukon-Tanana Upland of eastern Interior Alaska. This mapping covered parts of the Big Delta, Circle, Fairbanks, and Livengood quadrangles, an area identified by the U.S. Geological Survey's Earth Mapping Resources Initiative (USGS Earth MRI) as a priority for modernizing geologic mapping and evaluating regional favorability for rare-earth elements (REEs) and both critical and non-critical mineral resources. The geologic area of interest has experienced episodic magmatism from the Devonian through the Cenozoic. This magmatic and deformational period is associated with gold (+/- W, Te, Bi, Sb, and As) mineralization at the Fort Knox mine, Golden Summit, and other mineral deposits in the Fairbanks and Circle mining districts. The Roy Creek prospect hosts U, Th, REE, and F mineralization associated with a ca. 90 Ma peralkaline syenite stock. Magmatism during the latest Cretaceous and early Paleogene may be expressed as plutonic or hypabyssal intrusive rocks; notable intrusions of this age include the Lime Peak-Cache Mountain area (granite-related Sn-W prospects) and Table Mountain and Mount Prindle areas (Au, W) (Newberry and others, 1996; Robinson and others, 1990; Smith and others, 1987; Wiltse and others, 1995). This dataset helps refine interpretations of the region's geologic framework and supports tectonic and mineral resource studies across east-central Alaska. These data are provided as a Raw Data File and are available on the DGGS website at: http://doi.org/10.14509/32140. Purpose: This dataset provides geochemical data from 2025 DGGS bedrock mapping in the Yukon-Tanana Upland to help Alaska evaluate rare-earth, critical mineral, and gold resource potential in a historically productive mining region and to refine the geologic framework of east-central Alaska. Supplemental_Information: >geochemistry-download: Digital data available through the Alaska Geochemistry database online. Download files include data, analytical methods, and detection limits. Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 2025 Currentness_Reference: ground condition Status: Progress: Complete Maintenance_and_Update_Frequency: None planned Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -148.728614 East_Bounding_Coordinate: -143.914065 North_Bounding_Coordinate: 65.732374 South_Bounding_Coordinate: 64.453407 Keywords: Theme: Theme_Keyword_Thesaurus: ISO 19115 Topic Category Theme_Keyword: geoscientificInformation Theme: Theme_Keyword_Thesaurus: Alaska Division of Geological & Geophysical Surveys Theme_Keyword: Analyses Theme_Keyword: Analyses and Sampling Theme_Keyword: Analytical Lab Results Theme_Keyword: Analytical Results Theme_Keyword: Base Metals Theme_Keyword: Bedrock Theme_Keyword: Bedrock Geology Theme_Keyword: Chemistry Theme_Keyword: Critical Minerals Theme_Keyword: DGGS Theme_Keyword: Earth MRI Theme_Keyword: Economic Geology Theme_Keyword: Economic Study Theme_Keyword: Exploration Theme_Keyword: Geochemical Data Theme_Keyword: Geochemical Surveys Theme_Keyword: Geochemistry Theme_Keyword: Geologic Theme_Keyword: Geology Theme_Keyword: Gold Theme_Keyword: Granite Theme_Keyword: Igneous Theme_Keyword: Igneous Rocks Theme_Keyword: Intrusive Theme_Keyword: Lab Methods Theme_Keyword: Major Oxides Theme_Keyword: Metallogenesis Theme_Keyword: Metals Theme_Keyword: Metamorphic Theme_Keyword: Metamorphic Rocks Theme_Keyword: Methods Theme_Keyword: Mineral Assessment Theme_Keyword: Mineral Composition Theme_Keyword: Mineral Development Theme_Keyword: Mineral Exploration Theme_Keyword: Mineral Localities Theme_Keyword: Mineral Prospect Theme_Keyword: Mineral Resources Theme_Keyword: Mineralogy Theme_Keyword: Minerals Theme_Keyword: Mining Theme_Keyword: Minor Oxides Theme_Keyword: Platinum Theme_Keyword: Platinum Gold Theme_Keyword: Platinum Group Elements Theme_Keyword: Plutonic Theme_Keyword: Plutonic Rocks Theme_Keyword: Plutons Theme_Keyword: Precious Metals Theme_Keyword: Radioactive Minerals Theme_Keyword: Rare Earth Elements Theme_Keyword: Ree Theme_Keyword: Resource Assessment Theme_Keyword: Resource Information Theme_Keyword: Resources Theme_Keyword: Rocks Theme_Keyword: Sample Location Theme_Keyword: Strategic and Critical Minerals Assessment Project Theme_Keyword: Strategic Minerals Theme_Keyword: Sulfides Theme_Keyword: Trace Elements Theme_Keyword: Trace Geochemical Theme_Keyword: Trace Metals Place: Place_Keyword_Thesaurus: Alaska Division of Geological & Geophysical Surveys Place_Keyword: Alder Creek Place_Keyword: Bates Creek Place_Keyword: Bear Creek Place_Keyword: Beaver Creek Place_Keyword: Bedrock Creek Place_Keyword: Bellows Creek Place_Keyword: Berry Creek Place_Keyword: Birch Creek Place_Keyword: Bonnifield Mining District Place_Keyword: Boston Creek Place_Keyword: Brigham Creek Place_Keyword: Buster Creek Place_Keyword: Caribou Creek Place_Keyword: Chatham Creek Place_Keyword: Circle Mining District Place_Keyword: Cleary Creek Place_Keyword: Conner Creek Place_Keyword: Crane Creek Place_Keyword: Cripple Creek Place_Keyword: Crooked Creek Place_Keyword: Dome Creek Place_Keyword: Dora Creek Place_Keyword: Eagle Creek Place_Keyword: Fairbanks Creek Place_Keyword: Fairbanks Mining District Place_Keyword: Fish Creek Place_Keyword: Flat Creek Place_Keyword: Fossil Creek Place_Keyword: Ginger Creek Place_Keyword: Globe Creek Place_Keyword: Gold Dust Creek Place_Keyword: Goose Creek Place_Keyword: Harrison Fork Place_Keyword: Homestake Creek Place_Keyword: Hope Creek Place_Keyword: Idaho Creek Place_Keyword: Independence Creek Place_Keyword: Juniper Creek Place_Keyword: Kokomo Creek Place_Keyword: Lime Peak Place_Keyword: Long Creek Place_Keyword: Mascot Creek Place_Keyword: Miller Fork Place_Keyword: Moose Creek Place_Keyword: Mount Ryan Place_Keyword: Nome Creek Place_Keyword: Pilot Creek Place_Keyword: Poker Creek Place_Keyword: Pool Creek Place_Keyword: Porcupine Creek Place_Keyword: Portage Creek Place_Keyword: Ptarmigan Creek Place_Keyword: Quartz Creek Place_Keyword: Roy Creek Place_Keyword: Sheep Creek Place_Keyword: Silver Creek Place_Keyword: Sorrels Creek Place_Keyword: Tolovana Mining District Place_Keyword: Vadine Creek Place_Keyword: Warren Creek Place_Keyword: Willow Creek Place_Keyword: Wolf Creek Place_Keyword: Wood River Place_Keyword: Wood River Buttes Place_Keyword: Yellow Creek Place_Keyword: Zephyr Creek 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 acknowledge that our geologic work takes place throughout the unceded lands of the Indigenous Peoples of Alaska. Our offices are located on the traditional territories of the lower Tanana Dene Peoples and the Dena'ina Peoples. The DGGS Tolovana and Steese projects are funded by the State of Alaska and the USGS Earth Mapping Resources Initiative program under Cooperative Agreement numbers G24AC00323 and G23AC00372. The views and conclusions contained in this document are those of the authors and should not be interpreted as representing the opinions or policies of the U.S. Government. Mention of trade names or commercial products does not constitute their endorsement by the U.S. Government. Cross_Reference: Citation_Information: Originator: Buchanan, J.W. Originator: Wypych, Alicja Originator: Barrera, M.L. Originator: Biegel, J.M. Originator: Gavel, M.M. Originator: Harvey, D.A. Originator: Ketcham, R.A. Originator: Muller, I.P. Originator: Naibert, T.J. Originator: Newberry, R.J. Originator: Regan, S.P. Originator: Szumigala, D.J. Originator: Twelker, Evan Originator: Wildland, A.D. Publication_Date: 2025 Title: Geochemical data from samples collected in 2023 for the Chena and Mount Harper projects, Big Delta, Circle, Fairbanks, and Eagle quadrangles, Alaska Series_Information: Series_Name: Raw Data File Issue_Identification: RDF 2024-2 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 5 p Online_Linkage: https://doi.org/10.14509/31123 Cross_Reference: Citation_Information: Originator: Moshrefzadeh, Jamshid Originator: Acosta, M.D. Originator: Barrera, M.L. Originator: Buchanan, J.W. Originator: Naibert, T.J. Originator: Newberry, R.J. Originator: Norwood, L.P. Originator: Regan, S.P. Originator: Szumigala, D.J. Originator: Twelker, Evan Publication_Date: 2025 Title: Geochemical data from samples collected in 2024 for the Chena and Steese projects, Big Delta, Circle, Fairbanks, and Livengood quadrangles, Alaska Series_Information: Series_Name: Raw Data File Issue_Identification: RDF 2025-17 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/10.14509/31692 Cross_Reference: Citation_Information: Originator: Moshrefzadeh, J.A. Originator: Barrera, M.L. Originator: Buchanan, J.W. Originator: Naibert, T.J. Originator: Newberry, R.J. Originator: Norwood, L.P. Originator: Regan, S.P. Originator: Szumigala, D.J. Originator: Twelker, Evan Originator: Walser, S.L. Originator: Wilson, K.R. Publication_Date: 2025 Title: Field station locations and magnetic susceptibility data collected in 2025 for the Steese project, Yukon-Tanana Uplands, Alaska Series_Information: Series_Name: Raw Data File Issue_Identification: RDF 2025-28 v. 2 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 3 p Online_Linkage: https://doi.org/10.14509/31736 Cross_Reference: Citation_Information: Originator: Newberry, R.J. Originator: Bundtzen, T.K. Originator: Clautice, K.H. Originator: Combellick, R.A. Originator: Douglas, Tom Originator: Laird, G.M. Originator: Liss, S.A. Originator: Pinney, D.S. Originator: Reifenstuhl, R.R. Originator: Solie, D.N. Publication_Date: 1996 Title: Preliminary geologic map of the Fairbanks mining district, Alaska Series_Information: Series_Name: Public Data File Issue_Identification: PDF 96-16 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 17 p., 2 sheets, scale 1:63,360 Online_Linkage: https://doi.org/10.14509/1740 Cross_Reference: Citation_Information: Originator: Robinson, M.S. Originator: Smith, T.E. Originator: Metz, P.A. Publication_Date: 1990 Title: Bedrock geology of the Fairbanks mining district Series_Information: Series_Name: Professional Report Issue_Identification: PR 106 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 2 sheets, scale 1:63,360 Online_Linkage: https://doi.org/10.14509/2287 Cross_Reference: Citation_Information: Originator: Wiltse, M.A. Originator: Reger, R.D. Originator: Newberry, R.J. Originator: Pessel, G.H. Originator: Pinney, D.S. Originator: Robinson, M.S. Originator: Solie, D.N. Publication_Date: 1995 Title: Geologic map of the Circle mining district, Alaska Series_Information: Series_Name: Report of Investigation Issue_Identification: RI 95-2A Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 1 sheet, scale 1:63,360 Online_Linkage: https://doi.org/10.14509/2514 Data_Quality_Information: Attribute_Accuracy: Attribute_Accuracy_Report: This publication is 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. Logical_Consistency_Report: Not applicable Completeness_Report: This data release is complete. Positional_Accuracy: Horizontal_Positional_Accuracy: Horizontal_Positional_Accuracy_Report: Location data for field stations were collected using GPS-enabled tablets or smartphones running the Esri Field Maps app. The devices have a reported error of 10-12 m. Lineage: Process_Step: Process_Description: Sample collection - Fresh, unweathered rock samples were collected from surface outcrops by DGGS field geologists during geologic mapping. Location data for samples were recorded in the WGS84 datum using GPS-enabled field tablets. The samples collected and analyzed for this report were separated into two groups: those collected for whole-rock major-oxide, minor-oxide, and trace-element analyses (MOX; n=193), and those collected for trace-element geochemistry (GX; n=86) based on the presence of visible mineralization or alteration. MOX samples are igneous, metaigneous, or metasedimentary rocks that show little alteration or weathering. Process_Date: 2025 Process_Step: Process_Description: Sample preparation - DGGS staff trimmed weathered surfaces from MOX samples to analyze fresh material only, but left GX samples untrimmed to preserve alteration and mineralization. At ALS Geochemistry (ALS), all samples were processed and analyzed. During preparation, samples were crushed to greater than 70 percent passing 2 mm, and a 250 g split was pulverized to greater than 85 percent passing 75 microns. Process_Date: 2025 Process_Step: Process_Description: Sample analysis - ALS Geochemistry (ALS) analyzed MOX samples using package CCP-PKG01, which included lithium borate fusion with inductively coupled plasma atomic emission spectroscopy (ICP-AES) for major and minor oxides (ME-ICP06); lithium borate fusion with inductively coupled plasma mass spectrometry (ICP-MS) for trace and rare earth elements (ME-MS81); four-acid digestion with ICP-AES for Ag, Cd, Co, Cu, Li, Mo, Ni, Pb, Sc, and Zn (ME-4ACD81) and for ore-grade As (As-OG62); aqua regia digestion with ICP-MS for As, Bi, Hg, In, Re, Sb, Se, Te, and Tl (ME-MS42); induction furnace for total C and S (C-IR07, S-IR08); and fire assay for Au (Au-ICP21) and for Pt and Pd (PGM-MS23). GX samples were analyzed for trace elements by four-acid digestion and ICP-MS (ME-MS61L), for Au, Pt, and Pd by the same fire assay methods, and for B by sodium peroxide fusion and ICP-MS (B-MS82L). Sample 25MLB138 was identified as naturally occurring radioactive material (~11 µSv) and was processed separately in the ALS NORM facilities, so it could not be analyzed for Au or Pt and Pd because the NORM policy excludes fire assay; its over-limit rare earth elements, U, and Y were reanalyzed by fusion with ICP-AES (ME-OGREE) and by lithium borate fusion, dilution, and ICP-MS (U-DILMS81, Y-DILMS81). For all other over-limit results, As was reanalyzed by four-acid digestion and ICP-AES (ME-OG62), Ba by sodium peroxide fusion and ICP-AES (ME-ICP81), and Sample 25Z365, which contained visible gold, by fire assay with a gravimetric finish (Au-GRA21). In addition to the ALS internal quality control, DGGS submitted one blind reference standard for every 20 unknown samples. Process_Date: 2025 Spatial_Data_Organization_Information: Direct_Spatial_Reference_Method: point Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Geographic: Latitude_Resolution: 0.0000001 Longitude_Resolution: 0.0000001 Geographic_Coordinate_Units: decimal degrees Geodetic_Model: Horizontal_Datum_Name: NAD83 Ellipsoid_Name: GRS 80 Semi-major_Axis: 6378137 Denominator_of_Flattening_Ratio: 298.257222101 Entity_and_Attribute_Information: Detailed_Description: Entity_Type: Entity_Type_Label: geochemistry-download Entity_Type_Definition: Digital data available through the Alaska Geochemistry database online. Download files include data, analytical methods, and detection limits. Entity_Type_Definition_Source: Alaska Division of Geological & Geophysical Surveys (DGGS) Entity_Attribute_Layer_Name: geochemistry-download 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 2026-20 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: data Format_Version_Date: 20261020 Format_Information_Content: table Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: https://doi.org/10.14509/32140 Fees: Free download Metadata_Reference_Information: Metadata_Date: 20261020 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