Identification_Information: Citation: Citation_Information: Originator: Buchanan, J.W. Publication_Date: 2026 Title: Geochemical reanalysis of archival igneous rock pulp samples, Yukon-Tanana Upland, Alaska Geospatial_Data_Presentation_Form: spreadsheet Series_Information: Series_Name: Raw Data File Issue_Identification: RDF 2026-16 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/10.14509/32120 Description: Abstract: Geochemical reanalysis of archival igneous rock pulp samples, Yukon-Tanana Upland, Alaska, Raw Data File 2026-16, presents results from the reanalysis of igneous rock samples collected by the Division of Geological and Geophysical Surveys (DGGS) during fieldwork conducted between 1997 and 2009 across the Yukon-Tanana Upland (YTU). Since 2019, the DGGS Mineral Resources Section has focused on the YTU as part of the United States Geological Survey Earth MRI program, which aims to modernize geologic mapping and improve understanding of areas with potential critical mineral resources. As part of this effort, DGGS submitted archived sample pulps stored at the DGGS Geologic Materials Center to the USGS Geology, Geophysics, and Geochemistry Science Center for modern geochemical analysis. A total of 278 pulps from previous DGGS projects, including the Salcha River-Pogo, Fortymile, Alaska Highway Corridor, Caribou Creek, and Rampart Mining District projects, were selected for reanalysis. The resulting major-, minor-, and trace-element data support interpretation of magmatic mineral systems and provide updated geochemical information that informs geologic mapping and broad tectonic interpretation across the YTU. These data and accompanying discussion are released as a DGGS Raw Data File, and all publication components are available from the DGGS website at: http://doi.org/10.14509/32120. Purpose: The purpose of this dataset is to provide updated geochemical information that strengthens Alaska's ability to evaluate critical mineral resources and understand magmatic mineral systems in the Yukon-Tanana Upland. The reanalysis of archived DGGS rock samples supports statewide mineral resource assessments, improves geologic mapping, and helps guide future exploration and land-management decisions in 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: -150.939531 East_Bounding_Coordinate: -141.019216 North_Bounding_Coordinate: 65.256334 South_Bounding_Coordinate: 62.541677 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: Copper 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: Igneous Theme_Keyword: Igneous Rocks Theme_Keyword: Intrusion-hosted Theme_Keyword: Intrusive Theme_Keyword: Lab Methods Theme_Keyword: Major Oxides Theme_Keyword: Metallogenesis Theme_Keyword: Metals Theme_Keyword: Metamorphic Theme_Keyword: Metamorphic Minerals Theme_Keyword: Metamorphic Rocks Theme_Keyword: Methods Theme_Keyword: Mineral Assessment Theme_Keyword: Mineral Composition Theme_Keyword: Mineral Deposit Models Theme_Keyword: Mineral Development Theme_Keyword: Mineral Exploration Theme_Keyword: Mineral Resources Theme_Keyword: Mineralogy Theme_Keyword: Minerals 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: 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 Minerals Theme_Keyword: Trace Elements Theme_Keyword: Trace Geochemical Theme_Keyword: Trace Metals Place: Place_Keyword_Thesaurus: Alaska Division of Geological & Geophysical Surveys Place_Keyword: Airs Hill Place_Keyword: Alder Creek Place_Keyword: American Creek Place_Keyword: Beaver Creek Place_Keyword: Big Lake Place_Keyword: Boulder Creek Place_Keyword: Buckskin Creek Place_Keyword: Camp Creek Place_Keyword: Cathedral Bluffs Place_Keyword: Cathedral Rapids Place_Keyword: Cheneathda Hill Place_Keyword: Chicken Creek Place_Keyword: Chisana Mining District Place_Keyword: Chisana River Place_Keyword: Circle Mining District Place_Keyword: Deep Creek Place_Keyword: Dennison Fork Place_Keyword: Eliza Lake Place_Keyword: Fairbanks Mining District Place_Keyword: Fish Creek Place_Keyword: Fortymile Mining District Place_Keyword: Gardiner Creek Place_Keyword: Glacier Creek Place_Keyword: Goodpaster Mining District Place_Keyword: Goodpaster River Place_Keyword: Hot Springs Mining District Place_Keyword: Indian Creek Place_Keyword: Ingle Creek Place_Keyword: Ladue River Place_Keyword: Lilliwig Creek Place_Keyword: Lost Creek Place_Keyword: Minook Creek Place_Keyword: Mirror Creek Place_Keyword: Moose Creek Place_Keyword: Northway Junction Place_Keyword: Old Man Creek Place_Keyword: Omega Creek Place_Keyword: Paradise Hill Place_Keyword: Porcupine Creek Place_Keyword: Robertson River Place_Keyword: Roughtop Mountain Place_Keyword: Salcha River Place_Keyword: Seattle Creek Place_Keyword: Sheep Creek Place_Keyword: Silver Creek Place_Keyword: Sonora Creek Place_Keyword: Stevens Creek Place_Keyword: Stonehouse Creek Place_Keyword: Tanana River Place_Keyword: Tenmile Creek Place_Keyword: Tok Mining District Place_Keyword: Tok River Place_Keyword: Uhler Creek Place_Keyword: Unanimous Creek Place_Keyword: Utah Creek Place_Keyword: Voss Creek Place_Keyword: Walker Fork Place_Keyword: Willow Lake Place_Keyword: Yarger Lake 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: The author thanks Jaime Azain at the USGS Geology, Geophysics, and Geochemistry Science Center for help with sample coordination and discussion of data and laboratory methods. The analytical work was funded by the U.S. Geological Survey's Earth Mapping Resources Initiative (Earth MRI) analytical credits under cooperative agreement G23AC00372, and by the State of Alaska. Sample collection and shipping from the Geologic Materials Center were funded by the USGS National Geological and Geophysical Data Preservation Program (NGGDPP) under cooperative agreement G23AS00011. 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 USGS. Mention of trade names or commercial products does not constitute their endorsement by the USGS. Cross_Reference: Citation_Information: Originator: Solie, D.N. Originator: Werdon, M.B. Originator: Freeman, L.K. Originator: Newberry, R.J. Originator: Szumigala, D.J. Originator: Speeter, G.G. Originator: Elliott, B.A. Publication_Date: 2019 Title: Bedrock-geologic map, Alaska Highway corridor, Tetlin Junction, Alaska to Canada border Series_Information: Series_Name: Preliminary Interpretive Report Issue_Identification: PIR 2019-3 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 16 p., 2 sheets, scale 1:63,360 Online_Linkage: https://doi.org/10.14509/30038 Cross_Reference: Citation_Information: Originator: Szumigala, D.J. Originator: Newberry, R.J. Originator: Werdon, M.B. Originator: Athey, J.E. Originator: Flynn, R.L. Originator: Clautice, K.H. Publication_Date: 2002 Title: Bedrock geologic map of the Eagle A-1 Quadrangle, Fortymile mining district Series_Information: Series_Name: Preliminary Interpretive Report Issue_Identification: PIR 2002-1B 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/10.14509/2864 Cross_Reference: Citation_Information: Originator: Werdon, M.B. Originator: Newberry, R.J. Originator: Athey, J.E. Originator: Szumigala, D.J. Publication_Date: 2004 Title: Bedrock geologic map of the Salcha River-Pogo area, Big Delta Quadrangle, Alaska Series_Information: Series_Name: Report of Investigation Issue_Identification: RI 2004-1B Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 19 p., 1 sheet, scale 1:63,360 Online_Linkage: https://doi.org/10.14509/3209 Cross_Reference: Citation_Information: Originator: Werdon, M.B. Originator: Solie, D.N. Originator: Andrew, J.E. Originator: Freeman, L.K. Originator: Newberry, R.J. Originator: Szumigala, D.J. Originator: Elliott, B.A. Publication_Date: 2019 Title: Bedrock-geologic map, Alaska Highway corridor, Dot Lake to Tetlin Junction, Alaska Series_Information: Series_Name: Preliminary Interpretive Report Issue_Identification: PIR 2019-2 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 14 p., 2 sheets, scale 1:63,360 Online_Linkage: https://doi.org/10.14509/30037 Cross_Reference: Citation_Information: Originator: Werdon, M.B. Originator: Solie, D.N. Originator: Newberry, R.J. Originator: Freeman, L.K. Originator: Elliott, B.A. Originator: Lessard, R.R. Publication_Date: 2019 Title: Bedrock-geologic map, Alaska Highway corridor, Little Gerstle River to Dot Lake, Alaska Series_Information: Series_Name: Preliminary Interpretive Report Issue_Identification: PIR 2019-1 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 12 p., 1 sheet, scale 1:63,360 Online_Linkage: https://doi.org/10.14509/30036 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: The location coordinates of each sample station were recorded with handheld recreational-grade GPS units, or location data were marked on paper topographic maps in the field and later digitized in GIS. GPS devices in use at that time had reported errors of approximately 30 m. GPS Selective Availability was in effect prior to 2000, and pre-2000 sites and digitized sites may have errors of up to 100 m. Sample locations were collected using the NAD27 datum and are reported here using the NAD83 datum. Lineage: Process_Step: Process_Description: Sample collection - During field campaigns from 1997 to 2009, DGGS geologists collected 2–5 kg igneous whole‑rock samples from targeted stations for geochemical analysis. The samples were selected from fresh surfaces that generally represent the exposed outcrop. The samples were geochemically analyzed soon after collection, and the returned sample pulps were stored at the DGGS Geologic Materials Center (GMC) in Anchorage, AK. Process_Date: 2009 Process_Step: Process_Description: Sample preparation - Geochemical samples were historically processed by several companies using different methods. All samples were crushed so that at least 70 percent of the material passed through a -10 mesh screen. Either a representative 200- or 250-gram split was crushed in a chrome-steel ring mill until 85 percent passed through either a -150 or -200 mesh screen. For this reanalysis, samples were retrieved from the GMC and sent to the USGS, where staff used a chrome-steel ring mill to reprocess pulp samples that had passed a -150 mesh screen, reducing the sample to 85 percent passing through a -200 mesh screen, ensuring all samples met lab standards. Process_Date: 2024 Process_Step: Process_Description: Geochemistry - All samples were analyzed using GGGSC analytical packages, with analytes and methods as summarized here. Major oxides (Al2O3, CaO, Cr2O3, Fe2O3, MgO, MnO, P2O5, K2O, SiO2, Na2O, TiO2, V2O5) and loss on ignition (LOI) were determined using the WDXRF-MAJORS package, in which 0.2 to 0.5 g of sample was fused with a lithium tetraborate/lithium metaborate mixture to form a homogeneous glass disk; LOI was measured gravimetrically at 1000 C, and the prepared disks were analyzed by wavelength-dispersion X-ray fluorescence with LOI included in matrix corrections. Gold, platinum, and palladium (in ppb) were analyzed using the FA_AU-PD-PT package, in which weighed samples were mixed with flux, fused with lead oxide at 1100 C, cupelled, and the resulting bead dissolved in HCl and HNO3 prior to analysis by inductively coupled plasma optical emission spectrometry (ICP-OES). A suite of trace elements (Ag, As, Ba, Be, Bi, Cd, Ce, Cr, Co, Cs, Cu, Ga, Ge, Hf, In, La, Li, Lu, Mn, Hg, Mo, Nb, Ni, Pb, Rb, Re, Sb, Sc, Se, Sn, Sr, Ta, Te, Tb, Tl, Th, U, V, W, Y, Yb, Zn, Zr in ppm) and major elements (Al, Ca, Fe, K, Mg, Na, P, S, Ti in percent) were analyzed using the AQUA-REGIA package, in which samples were digested in a 3:1 mixture of HCl and HNO3 suitable for low-sulfide, non-organic materials, and the resulting solutions were analyzed by ICP-MS and ICP-OES. Additional trace and major elements (Ag, As, Ba, Be, Bi, B, Cd, Ce, Co, Cr, Cs, Cu, Dy, Er, Eu, Ga, Gd, Ge, Hf, Ho, In, La, Li, Lu, Mn, Mo, Nb, Nd, Ni, Pb, Pr, Rb, Sb, Sc, Sm, Sn, Sr, Ta, Tb, Th, Tl, Tm, U, V, W, Y, Yb, Zn, Zr in ppm; Al, Ca, Fe, K, Mg, P, Si, S, Ti in percent) were analyzed using the ICPOES_MS-61 package, in which samples were fused in glassy carbon crucibles with sodium peroxide (Na2O2), the resulting cake dissolved in HNO3, and the solutions analyzed by ICP-MS and ICP-OES. 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 2026-16 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: spreadsheet Format_Version_Date: 20260625 Format_Information_Content: table Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: https://doi.org/10.14509/32120 Fees: Free download Metadata_Reference_Information: Metadata_Date: 20260625 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