Scientific data near [64.12195,-141.60278]

Search area extends approximately 2.2 km east-west and 5.1 km north-south.

Geographic context

Counties, states, countries, continents, or oceans
Southeast Fairbanks	Census area
Alaska	state
United States	country
North America	continent
Land	continent
Map quadrangles, from USGS or Canadian NTS
Eagle A-2	1:63,360 Alaska quadrangle
Eagle	1:250,000 Alaska quadrangle
Watershed boundaries (USGS hydrologic units)
Fortymile River	hydrologic unit
190401	hydrologic accounting unit
Southwest Alaska	hydrologic subregion
Alaska	hydrologic region

Geology of US states

Digital geologic maps of the US states with consistent lithology, age, GIS database structure, and format

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Map symbol	Lithology	Unit name
PzPxybg	Metamorphic	Biotite gneiss, marble, schist, quartzite, and amphibolite
PzPxybg	Metamorphic	Biotite gneiss, marble, schist, quartzite, and amphibolite
PzPxybg	Metamorphic	Biotite gneiss, marble, schist, quartzite, and amphibolite
PzPxygs	Metamorphic	Gneiss, schist, and quartzite
Qs	Unconsolidated	Unconsolidated surficial deposits, undivided
Qs	Unconsolidated	Unconsolidated surficial deposits, undivided

Airborne geophysical surveys

Aerial surveys of magnetic anomaly and gamma ray emission; older surveys were analog record which have been digitized, newer surveys collected data in digital form.

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ID	Data type	Description
Fortymile mining district	M/EM-D	Fortymile mining district 7648 line km with spacing 0.40 km over parts of AK
Alaska Regional	M-Dz	Alaska Regional 14484 line km with spacing 16.10 km over parts of AK
Eagle	M-Dz	Eagle 12713 line km with spacing 1.20 km over parts of AK
Eagle	M/R-D	Eagle 2035 line km with spacing 9.60 km over parts of AK

Estimates of undiscovered mineral resources

National Mineral Resource Assessment 1998: Estimates of the number of undiscovered mineral resources of gold, silver, copper, lead, and zinc within identified permissive tracts (geographic areas in which mineral deposits may form).

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Tract	Deposit Type	Mineralization age
AK-EC07	Low-sulfide Au-quartz veins
AK-EC13	Porphyry Cu, BC-Ak type
AK-EC14	Plutonic porphyry Au
AK-EC18	Polymetallic vein
AK-EC15	Placer Au

The continental crust

Seventy-seven major components of the North American continent were delineated at a general scale (1:5,000,000); including the general composition, geological environment, and types of primary metals endowments that can be expected in each domain.

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Domain	Crust type	Region
Yukon-Tanana upper	Passive margin	Alaska

Alaska Geochemical Database, Version 2.0 (AGDB2)--including "best value" data compilations for rock, sediment, soil, mineral, and concentrate sample media

Geochemical analyses of rocks, mineral separates, bulk samples from lake and stream sediments, heavy mineral concentrates, and soils collected by USGS from 1962 to 2009.

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Lab ID	Sample medium	Description
F016312	sediment

Geochemistry of stream sediments in the US from the NURE-HSSR database

National-scale geochemical analysis of stream sediments and soils in the US collected and analyzed under the National Uranium Resource Evaluation program.

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Sample ID	Date collected	Sample type
7028306	1978-06-15	Wet natural-pond (or lake in Alaska) sediment sample dried at less than or equal to 100øC and sieved to -100 mesh through stainless steel sieves.

Geochemistry of water samples in the US from the NURE-HSSR database

National-scale geochemical analysis of water samples in the US collected and analyzed under the National Uranium Resource Evaluation program.

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Sample ID	Date collected	Sample type
3030181	1978-06-15	Natural-pond (or lake in Alaska) water sample acidified to a pH of less than or equal to 1 with reagent-grade nitric acid.

National Geochemical Database: Sediment

Geochemical analysis of sediment samples from the National Geochemical Database. Primarily inorganic elemental concentrations, most samples are of stream sediment in the continental US and Alaska.

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Sample ID	Sample source	Sample notes
F016312	lake	Lake Sediments; reanalyzed NURE sample;

Global assessment of undiscovered copper resources

Deposits, prospects, and permissive tracts for porphyry and sediment-hosted copper resources worldwide, with estimates of undiscovered copper resources.

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Tract name	Deposit type	Geology
Yukon-Tanana Upland	porphyry copper	Kluane Arc and Tertiary Kuskokwim Mountains volcanic-plutonic belt (continuation of Canadian Cordilleran continental arc); north of the Denali Fault
Pacific Margin	porphyry copper	Cretaceous through middle Tertiary volcanic and intrusive rocks representing a series of continental- and island-arc systems accreted and superimposed onto the paleomargin of northeast Asia.