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Twenty-two igneous and metamorphic rock samples were collected in a 20-km-long swath centered on the Alaska Highway between Tetlin Junction, Alaska, and the Canada border. Igneous and metamorphic rock samples were submitted to the Apatite to Zircon, Inc. laboratory (A2Z), where zircon U-Pb age analysis, using laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS), was performed by Paul O'Sullivan. The 15 felsic plutonic rock samples and one gabbro sample yield Cretaceous zircon U-Pb weighted-mean ages ranging from 95.7 Ma to 106.2 Ma. Zircons from a metadiorite yield a Triassic weighted-mean age of about 241.9 Ma. Metamorphic zircons from two samples with felsic igneous protoliths yield Mississippian...
Tags: Age Dates,
Alaska Highway Corridor,
Analyses and Sampling,
Bedrock,
Bedrock Geology, All tags...
Detrital Zircon,
Geochronology,
Geology,
Igneous Rocks,
Isotopes,
Metamorphic Rocks,
Nabesna Quadrangle,
Tanacross Quadrangle,
U-Pb,
geoscientificInformation, Fewer tags
The Preliminary Interpretive Report 2004-3B, "Bedrock geologic map of the Livengood SW C-3 and SE C-4 quadrangles, Tolovana mining district, Alaska," is the bedrock geologic map of an approximately 123-square-mile area in the central Livengood Quadrangle, Alaska.
Tags: 40Ar/39Ar,
Alaska, State of,
Geochemistry,
Geochronology,
Geologic Map, All tags...
Geology,
Igneous Rocks,
K-Ar,
Livengood Bench,
Livengood Dome,
Livengood Mining District,
Livengood Quadrangle,
Metamorphic Rocks,
Money Knob,
Old Smoky Prospect,
Plutonic Rocks,
STATEMAP Project,
Sedimentary Rocks,
Sm-Nd Dates,
Tolovana Mining District,
geoscientificInformation, Fewer tags
This data file presents 40Ar/39Ar step-heating geochronology results for a granite sample from the Livengood mining district. The Livengood area is a historically productive placer mining area approximately 80 road miles north of Fairbanks, Alaska. This data is a component of a geologic map and accompanying report that synthesizes recently collected and previously published agency and industry geologic data in a 1:50,000-scale comprehensive geologic map to build a better understanding of the geology and mineral-resource potential of the Livengood area.
Tags: 40Ar/39Ar,
Airborne Geophysical/Geological Mineral Inventory,
Bedrock,
Bedrock Geology,
Cascaden Ridge, All tags...
Copper,
Eolian,
Fossils,
Geochemistry,
Geochronology,
Geologic Map,
Gold,
Igneous Rocks,
Livengood,
Livengood Bench,
Livengood Quadrangle,
Man-Made Deposits,
Metamorphic Rocks,
Money Knob,
Plutonic Rocks,
Ranney Hollow,
STATEMAP Project,
Sedimentary Rocks,
Shorty Creek,
Silver,
Surficial Geology,
Tailings,
Tolovana Mining District,
Tolovana River,
geoscientificInformation, Fewer tags
This geologic map and report depicts portions of the Livengood B-3, B-4, C-3, and C-4 quadrangles. The Livengood area is a historically productive placer mining area approximately 80 road miles north of Fairbanks, Alaska. This report synthesizes recently collected and previously published agency and industry geologic data in a 1:50,000-scale comprehensive geologic map to build a better understanding of the geology and mineral-resource potential of the Livengood area. It expands and updates the Alaska Division of Geological & Geophysical Surveys (DGGS) Preliminary Interpretive Report (PIR) 2004-3 with the addition of new DGGS mapping and drillhole data from ITH, and integrates previously published DGGS surficial...
Tags: 40Ar/39Ar,
Airborne Geophysical/Geological Mineral Inventory,
Bedrock,
Bedrock Geology,
Cascaden Ridge, All tags...
Copper,
Eolian,
Fossils,
Geochemistry,
Geochronology,
Geologic Map,
Gold,
Igneous Rocks,
Livengood,
Livengood Bench,
Livengood Quadrangle,
Man-Made Deposits,
Metamorphic Rocks,
Money Knob,
Plutonic Rocks,
Ranney Hollow,
STATEMAP Project,
Sedimentary Rocks,
Shorty Creek,
Silver,
Surficial Geology,
Tailings,
Tolovana Mining District,
Tolovana River,
geoscientificInformation, Fewer tags
This bedrock geologic map was produced by using airborne magnetic and electromagnetic surveys, data and notes from several months of fieldwork, geochemical data, and laboratory investigations. These maps are the result of new field investigations in the Eagle A-1 Quadrangle by DGGS in 1999, 2000, and 2001. Field investigations are part of a three-year mapping program to provide geologic ground truth for airborne geophysical surveys flown by DGGS in the Fortymile mining district during 1998.
Tags: Alaska, State of,
Alluvial Deposits,
Colluvial Deposits,
Eagle Quadrangle,
Fortymile Mining District, All tags...
Fortymile River,
Geology,
Glacial Deposits,
Igneous Rocks,
Jack Wade Junction,
Man-Made Deposits,
Metamorphic Rocks,
Mining,
STATEMAP Project,
Steele Creek Dome,
Taylor Highway,
Top of the World Highway,
Unconsolidated Deposits,
geoscientificInformation, Fewer tags
This geologic map was produced by merging a bedrock geologic map and a surficial geologic map of the Eagle A-1 Quadrangle. Surficial geologic units were determined by a combination of air photo interpretation and site-specific field investigations. Bedrock geologic units were determined by using a combination of airborne magnetic and electromagnetic surveys, several months of fieldwork, geochemical data, and laboratory investigations. These maps are the result of new field investigations by DGGS in 1999 and 2001.
Tags: Alaska, State of,
Alluvial Deposits,
Colluvial Deposits,
Eagle Quadrangle,
Fortymile Mining District, All tags...
Fortymile River,
Geology,
Glacial Deposits,
Igneous Rocks,
Jack Wade Junction,
Man-Made Deposits,
Metamorphic Rocks,
Mining,
STATEMAP Project,
Steele Creek Dome,
Taylor Highway,
Top of the World Highway,
Unconsolidated Deposits,
geoscientificInformation, Fewer tags
Mineral-resources personnel from the Alaska Division of Geological & Geophysical Surveys (DGGS) carried out a helicopter-supported geological and geochemical resource assessment project in the Beaver, Bettles, Livengood, and Tanana quadrangles from June 23 through August 5, 2012. The objectives of DGGS's resource assessment are to improve the trace-element geochemical coverage of selected watersheds; to obtain modern, quantitative geochemical analyses; to understand the petrogenesis of the granites; and to better document established mineral occurrences. Stream-sediment, pan-concentrate, and rock sampling were conducted as part of the State's Rare Earth Elements and Strategic Minerals Assessment project, which is...
Tags: Aluminum,
Antimony,
Arsenic,
Augen Gneiss,
Barium, All tags...
Basalt,
Base Metals,
Batholith,
Beaver Quadrangle,
Bedrock,
Beryllium,
Bettles Quadrangle,
Bismuth,
Bonanza Creek,
Cadmium,
Calcium,
Caribou Mountain,
Cerium,
Cesium,
Chalcopyrite,
Chlorite,
Chromium,
Coal Creek,
Cobalt,
Copper,
Critical Minerals,
Dall River,
Dalton Highway,
Dysprosium,
Economic Geology,
Erbium,
Europium,
Exploration,
Felsic,
Fish Creek,
Fleshlanana Creek,
Fluorine,
Fort Hamlin Hills,
Gadolinium,
Galena,
Gallium,
Geochemical Data,
Geochemical Surveys,
Geochemistry,
Geology,
Germanium,
Gishna Creek,
Gneiss,
Gobblers Knob,
Gold,
Granite,
Greisen,
Hafnium,
Halu Creek,
Heavy Metals,
Holmium,
Hornfels,
Igneous Rocks,
Iron,
Ishtalitna Creek,
Kanuti Hot Springs,
Kanuti Kilolitna River,
Kanuti River,
Kilo Hot Springs,
Koyuk Mining District,
Lanthanide Elements,
Lanthanum,
Livengood Quadrangle,
Lode,
Lower Ray Hot Springs,
Lutetium,
Magnesium,
Major Oxides,
Manganese,
McQuesten Creek,
Metabasite,
Metals,
Metamorphic Rocks,
Metasedimentary rocks,
Metavolcanic rocks,
Mineral Assessment,
Mineral Deposit,
Mineral Localities,
Mineral Resources,
Minor Oxides,
Molybdenum,
Monazite,
Mount Henry Eakin,
Mount Tozi,
Neodymium,
Nickel,
Niobium,
No Name Creek,
Non-Metals,
Palladium,
Pan Concentrates,
Phosphorus,
Placer,
Placer Gold,
Platinum,
Platinum Group Elements,
Potassium,
Praseodymium,
Precious Metals,
Promethium,
Prospect Creek,
Rare Earth Elements,
Ray Mountains,
Ray River,
Ray River Hot Springs,
Ree,
Resource Assessment,
Resources,
Rhyolite,
Rubidium,
Samarium,
Scheelite,
Schist,
Selenium,
Silica,
Silver,
Sithylemenkat Lake,
Sodium,
Soil Chemistry,
Soil Sampling,
Sphalerite,
Strategic Minerals,
Stream Sediments,
Strontium,
Sulfides,
Sulfur,
Tanana Quadrangle,
Tantalum,
Thallium,
Thorium,
Tin,
Titanium,
Tokusatatquaten Lake,
Torment Creek,
Tourmaline,
Trace Elements,
Trace Geochemical,
Trace Metals,
Trans-Alaska Pipeline,
Tungsten,
Upper Ray Hot Springs,
Uranium,
Vanadium,
Volcaniclastics,
Ytterbium,
Zeunerite,
Zinc,
Zirconium,
geoscientificInformation, Fewer tags
In 2012, the State of Alaska established its Strategic and Critical Minerals (SCM) Assessment project, a State-funded Capital Improvement Project (CIP), to evaluate Alaska's statewide potential for SCM resources. The project is being implemented by the Alaska Division of Geological & Geophysical Surveys (DGGS), and involves obtaining new airborne-geophysical, geological, and geochemical data. For decades, the Ray Mountains area of west-central Alaska has been explored for its potential mineral resources. To further assess the rare-earth-element (REE) potential of the State-selected and top-filed lands in the Ray Mountains area, mineral-resource geologists at DGGS carried out a helicopter-supported geological and...
Tags: Base Metals,
Batholith,
Bedrock,
Bettles Quadrangle,
Cerium, All tags...
Chlorite,
Critical Minerals,
Dalton Highway,
Dysprosium,
Economic Geology,
Erbium,
Europium,
Exploration,
Felsic,
Fluorine,
Fort Hamlin Hills,
Gadolinium,
Geochemical Data,
Geochemical Surveys,
Geochemistry,
Geology,
Gneiss,
Greisen,
Heavy Metals,
Holmium,
Hornfels,
Igneous Rocks,
Iron,
Lanthanide Elements,
Lanthanum,
Lode,
Lutetium,
Major Oxides,
Metals,
Metamorphic Rocks,
Metavolcanic rocks,
Mineral Assessment,
Mineral Deposit,
Mineral Localities,
Mineral Resources,
Minor Oxides,
Monazite,
Neodymium,
No Name Creek,
Phosphorus,
Placer,
Praseodymium,
Promethium,
Rare Earth Elements,
Ray Mountains,
Ray River,
Ree,
Resource Assessment,
Resources,
Rhyolite,
Rubidium,
Samarium,
Sample Location,
Scheelite,
Schist,
Silica,
Silver,
Strategic Minerals,
Strategic and Critical Minerals Assessment Project,
Thallium,
Thorium,
Tin,
Titanium,
Tourmaline,
Trace Elements,
Trace Geochemical,
Trace Metals,
geoscientificInformation, Fewer tags
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
Report of Investigation 2006-2, "Bedrock geologic map of the Liberty Bell area, Fairbanks A-4 Quadrangle, Bonnifield mining district, Alaska," is the bedrock geologic map of an approximately 131-square-mile area surrounding the Liberty Bell Mine. The geology of the Liberty Bell area, located in the northern Alaska Range foothills, comprises Devonian metasedimentary and meta-igneous rocks of the Totatlanika Schist and Keevy Peak formations, Cretaceous and Tertiary igneous rocks, and overlying unconsolidated Tertiary sedimentary rocks of the Usibelli Group and the younger Nenana Gravel.
Tags: 40Ar/39Ar,
Alaska, State of,
Bedrock Geologic Map,
Bonnifield Mining District,
Coal, All tags...
Fairbanks Quadrangle,
Geochemical Data,
Geochronology,
Geology,
Igneous Rocks,
Jumbo Dome,
Liberty Bell Mine,
Metamorphic Rocks,
Palynology,
Petrography,
STATEMAP Project,
Sedimentary Rocks,
Volcanic Rocks,
geoscientificInformation, Fewer tags
Mineral-resources personnel from the Alaska Division of Geological & Geophysical Surveys carried out a geological field survey, including mapping and sampling, in the eastern part of the Bonnifield mining district in the Fairbanks A-1 and A-2, and the Healy D-1 and D-2 quadrangles, Alaska, from June 16 through July 18, 2008. The fieldwork provides basic information critical to building an understanding of Alaska's geology and is part of an integrated program of airborne geophysical surveys followed by geological mapping. Specifically, this work provides geologic context for geophysical surveys conducted in 2006. To represent a typical lithology, igneous or possible meta-igneous samples were collected and analyzed...
Tags: Alaska Range,
Analyses,
Analyses and Sampling,
Analytical Lab Results,
Analytical Results, All tags...
Bedrock,
Bedrock Geology,
Chemistry,
Chute Creek,
Dry Creek,
Fairbanks Quadrangle,
Geochemical Data,
Geochemical Surveys,
Geochemistry,
Geologic,
Geology,
Healy Quadrangle,
Igneous,
Igneous Rocks,
Kansas Creek,
Lab Methods,
Metamorphic Rocks,
Methods,
Mineral Assessment,
Mineralogy,
Minerals,
Red Mountain Creek,
Resource Assessment,
Resource Information,
Resources,
Rocks,
Rogers Creek,
STATEMAP Project,
Sample Location,
Sheep Creek,
geoscientificInformation, Fewer tags
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