{"action":"create","ckan_id":null,"date_created":"Sat, 14 Mar 2026 21:20:53 GMT","date_finished":null,"harvest_job_id":"be129330-b656-44ec-b4d7-f277bf7d7116","harvest_source_id":"31f41541-38a0-400b-b240-10ebcb0acd9a","id":"ffdf80e8-63e8-432f-87f5-42c91092d2e4","identifier":"https://dggs.alaska.gov/webpubs/metadata/RDF2024-2.xml","parent_identifier":null,"source_hash":"254c39eadf360cee658ac58fdefb4d027e8fdadd12bddffacb240a76d0da496d","source_raw":"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.2025Geochemical data from samples collected in 2023 for the Chena and Mount Harper projects, Big Delta, Circle, Fairbanks, and Eagle quadrangles, AlaskacsvRaw Data FileRDF 2024-2Fairbanks, Alaska, United StatesAlaska Division of Geological & Geophysical Surveys5 p.https://doi.org/10.14509/31123Geochemical data from samples collected in 2023 for the Chena and Mount Harper projects, Big Delta, Circle, Fairbanks, and Eagle quadrangles, Alaska, Raw Data File 2024-2, presents whole-rock and major- and trace-element geochemistry of rock samples collected to support 1:100,000-scale bedrock geologic mapping of ~5,750 mi2 (~15,000 km2) in portions of the Big Delta and Circle quadrangles and parts of the Fairbanks and Eagle quadrangles, Alaska. These samples were collected to support the Chena and Mount Harper/Richardson mapping projects, both of which are integral parts of the U.S. Geological Survey's Earth Mapping Resource Initiative (USGS Earth MRI) program. The aim of Earth MRI is to update the nation's surface and subsurface mapping to improve the knowledge of the country's overall geologic framework, with a specific focus on identifying areas that may contain undiscovered critical mineral resources. This raw data file (RDF) includes major oxide and trace element geochemistry of metamorphic and igneous rocks and potentially mineralized rocks sampled from the Chena and Mount Harper/Richardson project areas. Station location and field rock descriptions for the samples can be found in Gavel and others (2023). These geochemical analyses will further our understanding of potential mineral resources in the area, help distinguish between igneous and sedimentary protoliths in metamorphic rocks, and be used to characterize the Mesozoic and Cenozoic magmatic events. The regional geology is composed of structurally bound assemblages of polydeformed Paleozoic metasedimentary and metaigneous rocks ranging from lower greenschist to upper amphibolite facies. These rocks are structurally overlain by allochthonous oceanic mafic and ultramafic rocks of the Seventymile terrane at Nail Ridge. The metamorphic sequences are intruded by Cretaceous to Paleocene plutons. The Chena and Mount Harper/Richardson projects surround areas of historical mining activity, current production, and future potential mineral resource development. Granitic plutons were emplaced during multiple magmatic pulses in the mid-Cretaceous, spanning 115-90 Ma. This period of magmatism and deformation is associated with gold (+/- tellurium, bismuth, antimony, and arsenic) mineralization at the Pogo Mine and nearby prospects along the Pogo trend, including West Pogo, East Pogo, and Tibbs. Some latest Cretaceous to early Paleogene magmatism is associated with tungsten mineralization (Big Windy and Furs W skarn prospects). Tin- and rare earth element (REE)-bearing granites and peralkaline intrusions exist within the field areas and in historical and modern placer gold mines. This data file is released as a Raw Data File with an open end-user license. The data are available from the DGGS website: http://doi.org/10.14509/31123.These geochemical analyses further our understanding of potential mineral resources in the area, help distinguish between igneous and sedimentary protoliths in metamorphic rocks, and be used to characterize the Mesozoic and Cenozoic magmatic events.>geochemistry-download: Digital data available through the Alaska Geochemistry database online. Download files include data, analytical methods, and detection limits.2023ground conditionCompleteNone planned-147.224223-143.92040665.18606164.182181ISO 19115 Topic CategorygeoscientificInformationAlaska Division of Geological & Geophysical SurveysAnalysesAnalyses and SamplingAnalytical Lab ResultsAnalytical ResultsBase MetalsBedrockBedrock Geologic MapBedrock GeologyCritical MineralsDGGSEconomic GeologyEconomic StudyExplorationGeochemical DataGeochemical SurveysGeochemistryGeologicGeologic HazardsGeologic MapGeologyGoldGraniteIgneousIgneous RocksLab MethodsLodeMagmatic ArcMagnetic SusceptibilityMagneticsMajor OxidesMetallogenesisMetalsMetamorphicMetamorphic DepositMetamorphic RocksMetasedimentary RocksMetavolcanic rocksMethodsMineral AssessmentMineral DepositMineral DevelopmentMineral LocalitiesMineral ProspectMineral ResourcesMineralogyMineralsMiningMinor OxidesOre DepositOresPan ConcentratesPlacer GoldPlatinum Group ElementsPlutonicPlutonic HostedPlutonic RocksPlutonsPolymetallic VeinPorphyryPrecious MetalsProspecting SitesProvenancePyroclasticsRare Earth ElementsReeReplacementResource AssessmentResource InformationResource ModelResourcesRocksSTATEMAP ProjectSample LocationStrategic MineralsStream SedimentsSulfidesTephraTinTrace ElementsTrace GeochemicalTrace MetalsTungstenUltramaficVein DepositAlaska Division of Geological & Geophysical SurveysAcme CreekAnderson CreekAngel CreekAntimony CreekAnvil CreekBeaver CreekBlack Bear CreekBlackshell CreekBluestone CreekBonanza CreekBoulder CreekCalifornia CreekCaribou CreekCash CreekCentral CreekChena Hot SpringsChena RiverChena River State Recreation AreaColorado CreekCrawford CreekDan CreekDeep CreekDemar CreekDexter CreekEldorado CreekEmory CreekFar MountainFrench CreekGlacier CreekGlobe CreekGold CreekGoodpaster RiverGranite CreekGranite TorsGraystone CreekHorner CreekHunts CreekLast Chance CreekLawson CreekLost CreekMaiden CreekMalburn CreekMarten CreekMascot CreekMastadon CreekMontana CreekMonument CreekMoose CreekMunson CreekOreo ProspectOttertail CreekPaldo CreekPalmer CreekPine CreekPleasant CreekPorcupine CreekQuartz CreekRicks CreekRock CreekSalcha RiverSerpentine CreekSevenmile CreekShamrock CreekShaw CreekShaw Creek DomeShawnee PeakSlate CreekSonora CreekStiles CreekStone Boy CreekStuart CreekTanana RiverTenmile CreekTeuchet CreekTibbs CreekWheeler CreekWickersham CreekWolf CreekWolverine 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.The geologic mapping portion of the 2023 field season was funded by the U.S. Geological Survey Earth Mapping Resources Initiative under Cooperative Agreement Number G23AC00372 and by State of Alaska Capital Improvement funds. The geochemical analyses reported herein were funded by the State of Alaska. 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. Any mention of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the USGS or the DGGS.Gavel, M.M.Twelker, EvanWypych, AlicjaNaibert, T.J.Newberry, R.J.Szumigala, D.J.Wildland, A.D.Barrera, M.L.Biegel, J.N.Harvey, D.A.Ketcham, R.A.Muller, I.P.Regan, S.P.2023Field station locations and magnetic susceptibility data for the Chena-Pogo and Mount Harper projects, Big Delta and Circle quadrangles, Alaska, collected June-September 2023Raw Data FileRDF 2023-27Fairbanks, Alaska, United StatesAlaska Division of Geological & Geophysical Surveys3 phttps://doi.org/10.14509/31096In addition to BV Mineral Laboratories' accredited (ISO/IEC 17025) internal quality-control program, DGGS monitored analysis quality with one reference-material standard per batch of 20 analyses.Not applicableThis data releaase is complete.Location data were collected using GPS-enabled tablets and smartphones running the ESRI Field Maps App. Data were merged into an ArcGIS geodatabase. The devices have a reported error of about 10 m.Field data collection - During the 2023 summer field season, geologists from DGGS conducted 1:100,000-scale bedrock geologic mapping of ~5,750 mi2 (~15,000 km2) within the Big Delta and Circle quadrangles and parts of the Fairbanks and Eagle quadrangles, Alaska. Geologists collected representative rock samples for whole-rock major-oxide and trace-element geochemistry to aid in the classification of rock units, correlation of units over the map area, and understanding of the tectonic setting. They obtained sample locations using GPS-enabled tablets and smartphones running the Esri Field Maps App, which has a reported error of approximately 10 m.2023Sample selection - Rock samples collected for geochemical analyses fall into two categories with different purposes. Igneous, metaigneous, and metasedimentary rocks showing little alteration or weathering were collected for whole-rock major-oxide, minor-oxide, and trace-element analyses (MOX). These MOX samples are geographically dispersed and aid in rock classification, protolith identification, petrogenesis, and discrimination of tectonic setting. Additionally, any rock types with visible mineralization or alteration were preferentially collected and analyzed for trace-element geochemistry (GX).2023Sample preparation - DGGS staff trimmed MOX samples to remove weathering, small alteration zones, or any other heterogeneities before they were sent for analysis. GX samples were left as collected in the field. All samples were processed and analyzed by Bureau Veritas Commodities Canada Ltd. Mineral Laboratories (BV). All samples were crushed to greater than 70 percent passing through a 2-mm screen, and a 250-g split was pulverized to greater than 85 percent passing through a 75-micron screen (BV package PRP70-250).2023Geochemistry - All whole-rock major-oxide, minor-oxide, and trace-element analyses samples (MOX) were analyzed with BV package LF202, which includes the following analytes and methods: LF300, GRAV, LF100, TC000, and AQ200. All MOX samples were analyzed with BV packages for either Au or Au, Pt, and Pd, depending on the possibility of the rock sample including Platinum Group Elements (PGEs). Six MOX samples were analyzed with additional packages to provide elemental information not covered in other analytical packages. All mineralized (GX) samples were analyzed with BV package MA250 for major- and trace-element values. GX samples were also analyzed with BV packages for either Au (FA330) or Au, Pt, and Pd (FA130) with the same methods described above. Eighteen GX samples were analyzed with AQ251 for additional elements with the same methods described above. Nine GX samples had individual elemental analyses over the upper detection limit of the methods described above and were reanalyzed with methods more suited for higher concentrations.2023point0.0000010.000001decimal 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 2024-2The 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 pricingcsv20250128tablehttps://doi.org/10.14509/31123Free download20250128Alaska 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","source_transform":null,"status":"error"}