Moshrefzadeh, J.A.Barrera, M.L.Buchanan, J.W.Naibert, T.J.Newberry, R.J.Norwood, L.P.Regan, S.P.Szumigala, D.J.Twelker, EvanWalser, S.L.Wilson, K.R.2026dataRaw Data FileRDF 2026-20Fairbanks, Alaska, United StatesAlaska Division of Geological & Geophysical Surveys7 p.https://doi.org/10.14509/32140Geochemical 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.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.>geochemistry-download: Digital data available through the Alaska Geochemistry database online. Download files include data, analytical methods, and detection limits.2025ground conditionCompleteNone planned-148.728614-143.91406565.73237464.453407ISO 19115 Topic CategorygeoscientificInformationAlaska Division of Geological & Geophysical SurveysAnalysesAnalyses and SamplingAnalytical Lab ResultsAnalytical ResultsBase MetalsBedrockBedrock GeologyChemistryCritical MineralsDGGSEarth MRIEconomic GeologyEconomic StudyExplorationGeochemical DataGeochemical SurveysGeochemistryGeologicGeologyGoldGraniteIgneousIgneous RocksIntrusiveLab MethodsMajor OxidesMetallogenesisMetalsMetamorphicMetamorphic RocksMethodsMineral AssessmentMineral CompositionMineral DevelopmentMineral ExplorationMineral LocalitiesMineral ProspectMineral ResourcesMineralogyMineralsMiningMinor OxidesPlatinumPlatinum GoldPlatinum Group ElementsPlutonicPlutonic RocksPlutonsPrecious MetalsRadioactive MineralsRare Earth ElementsReeResource AssessmentResource InformationResourcesRocksSample LocationStrategic and Critical Minerals Assessment ProjectStrategic MineralsSulfidesTrace ElementsTrace GeochemicalTrace MetalsAlaska Division of Geological & Geophysical SurveysAlder CreekBates CreekBear CreekBeaver CreekBedrock CreekBellows CreekBerry CreekBirch CreekBonnifield Mining DistrictBoston CreekBrigham CreekBuster CreekCaribou CreekChatham CreekCircle Mining DistrictCleary CreekConner CreekCrane CreekCripple CreekCrooked CreekDome CreekDora CreekEagle CreekFairbanks CreekFairbanks Mining DistrictFish CreekFlat CreekFossil CreekGinger CreekGlobe CreekGold Dust CreekGoose CreekHarrison ForkHomestake CreekHope CreekIdaho CreekIndependence CreekJuniper CreekKokomo CreekLime PeakLong CreekMascot CreekMiller ForkMoose CreekMount RyanNome CreekPilot CreekPoker CreekPool CreekPorcupine CreekPortage CreekPtarmigan CreekQuartz CreekRoy CreekSheep CreekSilver CreekSorrels CreekTolovana Mining DistrictVadine CreekWarren CreekWillow CreekWolf CreekWood RiverWood River ButtesYellow CreekZephyr CreekThis 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 SurveysMetadata Managermailing and physical

3354 College Road

FairbanksAK99709-3707USA(907)451-5020(907)451-5050dggspubs@alaska.gov8 am to 4:30 pm, Monday through Friday, except State holidaysPlease 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.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.Buchanan, J.W.Wypych, AlicjaBarrera, M.L.Biegel, J.M.Gavel, M.M.Harvey, D.A.Ketcham, R.A.Muller, I.P.Naibert, T.J.Newberry, R.J.Regan, S.P.Szumigala, D.J.Twelker, EvanWildland, A.D.2025Raw Data FileRDF 2024-2Fairbanks, Alaska, United StatesAlaska Division of Geological & Geophysical Surveys5 phttps://doi.org/10.14509/31123Moshrefzadeh, JamshidAcosta, M.D.Barrera, M.L.Buchanan, J.W.Naibert, T.J.Newberry, R.J.Norwood, L.P.Regan, S.P.Szumigala, D.J.Twelker, Evan2025Raw Data FileRDF 2025-17Fairbanks, Alaska, United StatesAlaska Division of Geological & Geophysical Surveys3 phttps://doi.org/10.14509/31692Moshrefzadeh, J.A.Barrera, M.L.Buchanan, J.W.Naibert, T.J.Newberry, R.J.Norwood, L.P.Regan, S.P.Szumigala, D.J.Twelker, EvanWalser, S.L.Wilson, K.R.2025Raw Data FileRDF 2025-28 v. 2Fairbanks, Alaska, United StatesAlaska Division of Geological & Geophysical Surveys3 phttps://doi.org/10.14509/31736Newberry, R.J.Bundtzen, T.K.Clautice, K.H.Combellick, R.A.Douglas, TomLaird, G.M.Liss, S.A.Pinney, D.S.Reifenstuhl, R.R.Solie, D.N.1996Public Data FilePDF 96-16Fairbanks, Alaska, United StatesAlaska Division of Geological & Geophysical Surveys17 p., 2 sheets, scale 1:63,360https://doi.org/10.14509/1740Robinson, M.S.Smith, T.E.Metz, P.A.1990Professional ReportPR 106Fairbanks, Alaska, United StatesAlaska Division of Geological & Geophysical Surveys2 sheets, scale 1:63,360https://doi.org/10.14509/2287Wiltse, M.A.Reger, R.D.Newberry, R.J.Pessel, G.H.Pinney, D.S.Robinson, M.S.Solie, D.N.1995Report of InvestigationRI 95-2AFairbanks, Alaska, United StatesAlaska Division of Geological & Geophysical Surveys1 sheet, scale 1:63,360https://doi.org/10.14509/2514This 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.Not applicableThis data release is complete.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.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.2025Sample 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.2025Sample 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.2025point0.00000010.0000001decimal degreesNAD83GRS 806378137298.257222101geochemistry-downloadDigital data available through the Alaska Geochemistry database online. Download files include data, analytical methods, and detection limits.Alaska Division of Geological & Geophysical Surveys (DGGS)geochemistry-downloadAlaska Division of Geological & Geophysical SurveysMetadata Managermailing and physical

3354 College Road

FairbanksAK99709-3707USA(907)451-5020(907)451-5050dggspubs@alaska.gov8 am to 4:30 pm, Monday through Friday, except State holidaysPlease 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.RDF 2026-20The 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 pricingdata20261020tablehttps://doi.org/10.14509/32140Free download20261020Alaska Division of Geological & Geophysical SurveysSimone MontayneMetadata Managermailing and physical

3354 College Road

FairbanksAK99709-3707USA(907)451-5020(907)451-5050dggspubs@alaska.gov8 am to 4:30 pm, Monday through Friday, except State holidaysFGDC Content Standard for Digital Geospatial MetadataFGDC-STD-001-1998If 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.extdggs metadata extensions