Trace-element geochemical data from stream sediments collected in the Tok River area, Tanacross A-5 and A-6 quadrangles, Alaska in 2016

In 2016, geologists from the Alaska Division of Geological & Geophysical Surveys (DGGS) and University of Alaska Fairbanks carried out a two-part geologic mapping and geochemical sampling project in the Tok River area of the Tanacross A-5 and A-6 quadrangles (June 12-26 and July 8-26). This report provides results of stream-sediment sampling for trace-element geochemistry. An initial suite of sediment samples was collected from streams draining known gold occurrences, including the Stibnite Creek and Noah prospects, and numerous prospects in the White Gold area. These samples were split in half and the two splits were sieved to -200 mesh and -80 mesh, respectively. The splits were then both analyzed to determine...

Tags: Analyses, Analyses and Sampling, Analytical Lab Results, Analytical Results, Chemistry, All tags... Dall Prospect, Eagle Prospect, Economic Geology, Exploration, Geochemical Data, Geochemical Surveys, Geochemistry, Geology, Gold, Heavy Metals, Jacqueline Prospect, Lab Methods, Metals, Mineral Assessment, Mineral Deposit, Mineral Localities, Mineral Prospect, Mineral Resources, Placer, Placer Gold, Precious Metals, STATEMAP Project, Shalosky Prospect, Stream Sediments, Tanacross Quadrangle, Tok, Tok Mining District, Tok River, Trace Elements, Trace Geochemical, Trace Metals, geoscientificInformation, Fewer tags

Major-oxide and trace-element geochemical data from rocks collected in the Tok River area, Tanacross A-5 and A-6 quadrangles, Alaska in 2016

Geologists from the Alaska Division of Geological & Geophysical Surveys (DGGS) and University of Alaska carried out a two-part geologic mapping and geochemical sampling project in the Tok River area of the Tanacross A-5 and A-6 quadrangles (June 12-26 and July 8-26). The Tok River area is adjacent to the Delta mineral belt volcanogenic massive-sulfide (VMS) district, the Peak gold-silver-copper skarn, and the structurally controlled gold and antimony mineralization in the Stibnite Creek and White Gold areas. The Tok River project area includes the Noah (also called Hona) prospect, an intrusion-related copper prospect. The combination of insufficient detailed geologic mapping, historical and current industry interest...

Tags: Analyses, Analyses and Sampling, Analytic Signal, Analytical Lab Results, Analytical Results, All tags... Antimony, Arsenic, Bedrock, Chemistry, Dall Prospect, Eagle Prospect, Geochemical Data, Geochemical Surveys, Geochemistry, Gold, Gold Prospect, Jacqueline Prospect, Lab Methods, Major Oxides, Massive Sulfide Deposit, Massive Sulfide Occurrence, Massive Sulfide Prospect, Massive Sulfides, Metallogenesis, Metals, Metamorphic Rocks, Metasedimentary Rocks, Metavolcanic rocks, Mineral Assessment, Mineral Localities, Mineral Prospect, Minor Oxides, Noah Prospect, Parton Prospect, Shalosky Prospect, Tanacross Quadrangle, Tok, Tok Mining District, Tok River, Trace Elements, Trace Geochemical, Volcanogenic Massive Sulfide, geoscientificInformation, Fewer tags

Tok electromagnetic and magnetic airborne geophysical survey data compilation

The Tok electromagnetic and magnetic airborne geophysical survey data were acquired with a DIGHEMv Electromagnetic (EM) system and a CGG D1344 cesium magnetometer with a Scintrex CS3 cesium sensor. The EM and magnetic sensors were flown at a height of 30 meters (m). In addition the survey recorded data from radar and laser altimeters, a GPS navigation system, 50/60 Hz monitors and a video camera. Flights were performed with an AS-350-B3 Squirrel helicopter at a mean terrain clearance of 60 m along NE-SW (12 degrees) survey flight lines with a spacing of 400 m. Tie lines were flown perpendicular to the flight lines at intervals of approximately 4,800 m. These data were produced under contract between the State of...

Tags: Aeromagnetic, Aeromagnetic Data, Aeromagnetic Map, Airborne Geophysical Survey, Alaska, State of, All tags... Analytic Signal, Apparent Resistivity Contours, Apparent Resistivity Data, Apparent Resistivity Map, Apparent Resistivity Survey, Electromagnetic Anomalies, Electromagnetic Data, Electromagnetic Survey, First Vertical Derivative, Geophysical Map, Geophysical Survey, Geophysics, Geophysics Search Tag, Gridded Data, Gulkana Quadrangle, HEM Survey, HFEM Survey, Magnetic Contours, Magnetic Data, Magnetic Survey, Magnetics, Mentasta Pass, Mount Hayes Quadrangle, Nabesna Quadrangle, Raster Image, Tanacross Quadrangle, Tok Mining District, Tok River, geoscientificInformation, Fewer tags

40Ar/39Ar data from the Tok River area, Tanacross A-5 and A-6 quadrangles and adjoining areas, eastern Alaska Range

This report presents 40Ar/39Ar step-heating geochronology results for igneous and metamorphic rocks from the Alaska Division of Geological & Geophysical Surveys' (DGGS) geologic mapping project in the Tanacross A-5 and A-6 quadrangles and adjoining areas. Our results indicate the Hona granodiorite pluton intruded the area in the Late Cretaceous between 76 and 71 Ma. We determined Cretaceous metamorphic ages from 126 to 121 Ma for hornblende, biotite, sericite and muscovite from multiple samples of upper greenschist to amphibolite grade rocks. This is consistent with regional argon results that imply this area is in the upper plate of the Yukon Tanana Terrane (Hansen and Dusel-Bacon, 1998). Basaltic andesite dikes...

Tags: 40Ar/39Ar, Amphibolite, Analyses, Analyses and Sampling, Analytical Lab Results, All tags... Analytical Results, Basalt, Bedrock, Crystals, Exploration, Faulting, Geochronology, Geologic, Geology, Gneiss, Granite, Granodiorite, Greenschist, Hornblende, Igneous, Isotopes, Metamorphic, Metamorphic Rocks, Metamorphism, Methods, Mica, Mineral Composition, Mineral Prospect, Mineralogy, Minerals, Muscovite, Noah Prospect, Plagioclase, Plutonic, Rocks, Sample Location, Sericite, Shalosky Prospect, Tanacross Quadrangle, Tok, Tok Mining District, Tok River, geoscientificInformation, Fewer tags