Scientific data near [62.93419,-156.05877]

Search area extends approximately 17.8 km east-west and 39.1 km north-south.

Geographic context

Counties, states, countries, continents, or oceans
Yukon-Koyukuk	Census area
Alaska	state
United States	country
North America	continent
Land	continent
Map quadrangles, from USGS or Canadian NTS
Iditarod D-1	1:63,360 Alaska quadrangle
Iditarod	1:250,000 Alaska quadrangle
Watershed boundaries (USGS hydrologic units)
Stony River	hydrologic unit
190304	hydrologic accounting unit
Yukon	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
Kk	Sedimentary	Kuskokwim Group, undivided
Kk	Sedimentary	Kuskokwim Group, undivided
Kk	Sedimentary	Kuskokwim Group, undivided
Kk	Sedimentary	Kuskokwim Group, undivided
Kmvi	Igneous - Volcanic	Mafic to intermediate volcano-plutonic complexes
Kmvi	Igneous - Volcanic	Mafic to intermediate volcano-plutonic complexes
Kmvi	Igneous - Volcanic	Mafic to intermediate volcano-plutonic complexes
Qs	Unconsolidated	Unconsolidated surficial deposits, undivided
Qs	Unconsolidated	Unconsolidated surficial deposits, undivided
Qs	Unconsolidated	Unconsolidated surficial deposits, undivided
Qs	Unconsolidated	Unconsolidated surficial deposits, undivided
Qs	Unconsolidated	Unconsolidated surficial deposits, undivided
Qs	Unconsolidated	Unconsolidated surficial deposits, undivided
TKg	Igneous - Plutonic	Felsic granitic rocks
TKgd	Igneous - Plutonic	Granodiorite to quartz monzodiorite
TKhi	Igneous - Plutonic	Dikes and subvolcanic rocks
TKv	Igneous - Volcanic	Volcanic rocks in southern Alaska

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
West-Central Alaska	M-D	West-Central Alaska 21360 line km with spacing 9.60 km over parts of AK
Medfra '78	M-D	Medfra '78 10702 line km with spacing 1.60 km over parts of AK
Medfra	M/R-D	Medfra 2245 line km with spacing 9.60 km over parts of AK
Ophir	M/R-D	Ophir 2245 line km with spacing 9.60 km over parts of AK
Mc Grath	M/R-D	Mc Grath 2301 line km with spacing 9.60 km over parts of AK
Iditarod	M/R-D	Iditarod 2301 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-SW05	Peraluminous granite porphyry gold
AK-SW14	Placer Au
AK-SW13	Plutonic porphyry Au
AK-SW16	Polymetallic vein

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
Farewell buried	Back-arc basin	Alaska

Radiometric ages of rocks from Alaska

Radiometric ages of rocks or minerals sampled from Alaska. The data were collected from professional publications and/or received from researchers and used by permission.

Database Home

Record	Type	Comment
78BT461
78BT461
78BT461

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.

Database Home

Lab ID	Sample medium	Description
CHQ005	sediment
CHQ016	sediment
CHQ060	sediment
CHQ067	sediment
CHQ073	sediment
CHQ076	sediment
CHQ080	sediment
CHQ094	sediment
CHQ095	sediment
CHQ187	sediment
CHQ328	sediment
CHQ342	sediment
CHQ381	sediment
CHQ506	concentrate	panned C3 fraction
CHQ514	concentrate	panned C3 fraction
CHQ525	concentrate	panned C3 fraction
CHQ526	concentrate	panned C3 fraction
CHQ538	concentrate	panned C3 fraction
CHQ569	concentrate	panned C3 fraction
CHQ598	concentrate	panned C3 fraction
CHQ599	concentrate	panned C3 fraction
CHQ815	concentrate	panned C3 fraction
CHQ871	concentrate	panned C3 fraction
CHQ875	concentrate	panned C3 fraction
CHR512	sediment
CHR515	sediment
CHR516	sediment
CHR517	sediment
CHR533	sediment
CHR547	sediment
CHR568	sediment
CHR569	sediment
CHR589	sediment
CHR692	sediment
CHR803	sediment
CHR808	sediment
CHR817	sediment
CHV532	rock	sedimentary shale
CHV549	rock	sedimentary shale
CHV554	rock	igneous monzonite

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
7014508	1978-08-17	Wet stream sediment sample dried at less than or equal to 100øC and sieved to -100 mesh through stainless steel sieves.
7014509	1978-08-17	Wet stream sediment sample dried at less than or equal to 100øC and sieved to -100 mesh through stainless steel sieves.
7014510	1978-08-17	Wet stream sediment sample dried at less than or equal to 100øC and sieved to -100 mesh through stainless steel sieves.
7014512	1978-08-17	Wet stream sediment sample dried at less than or equal to 100øC and sieved to -100 mesh through stainless steel sieves.
7014514	1978-08-17	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.
7014515	1978-08-17	Wet stream sediment sample dried at less than or equal to 100øC and sieved to -100 mesh through stainless steel sieves.
7014516	1978-08-17	Wet stream sediment sample dried at less than or equal to 100øC and sieved to -100 mesh through stainless steel sieves.
7014517	1978-08-17	Wet stream sediment sample dried at less than or equal to 100øC and sieved to -100 mesh through stainless steel sieves.
7014689	1978-08-17	Wet stream sediment sample dried at less than or equal to 100øC and sieved to -100 mesh through stainless steel sieves.
7014690	1978-08-17	Wet stream sediment sample dried at less than or equal to 100øC and sieved to -100 mesh through stainless steel sieves.
7014692	1978-08-17	Wet stream 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.

Database Home

Sample ID	Date collected	Sample type
3015591	1978-08-17	Stream water sample acidified to a pH of less than or equal to 1 with reagent-grade nitric acid.
3015592	1978-08-17	Stream water sample acidified to a pH of less than or equal to 1 with reagent-grade nitric acid.
3015593	1978-08-17	Stream water sample acidified to a pH of less than or equal to 1 with reagent-grade nitric acid.
3015595	1978-08-17	Stream water sample acidified to a pH of less than or equal to 1 with reagent-grade nitric acid.
3015597	1978-08-17	Natural-pond (or lake in Alaska) water sample acidified to a pH of less than or equal to 1 with reagent-grade nitric acid.
3015598	1978-08-17	Stream water sample acidified to a pH of less than or equal to 1 with reagent-grade nitric acid.
3015599	1978-08-17	Stream water sample acidified to a pH of less than or equal to 1 with reagent-grade nitric acid.
3015600	1978-08-17	Stream water sample acidified to a pH of less than or equal to 1 with reagent-grade nitric acid.
3015773	1978-08-17	Stream water sample acidified to a pH of less than or equal to 1 with reagent-grade nitric acid.
3015774	1978-08-17	Stream water sample acidified to a pH of less than or equal to 1 with reagent-grade nitric acid.
3015775	1978-08-17	Stream water sample acidified to a pH of less than or equal to 1 with reagent-grade nitric acid.

National Geochemical Database: Rock

Geochemical analysis of rock samples collected and analyzed by the USGS. This dataset includes and supersedes rock data formerly released as "Geochemistry of igneous rocks in the US extracted from the PLUTO database"

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Sample ID	Rock type	Rock name
CHV532	unspecified
CHV549	unspecified
CHV554	unspecified
M142842	igneous	basalt

Mineral Resource Data System

MRDS describes metallic and nonmetallic mineral resources throughout the world. Included are deposit name, location, commodity, deposit description, geologic characteristics, production, reserves, resources, and references.

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Site name	Development	Commodities
Unnamed (east flank of Takotna Mountain)	Occurrence	AG CU PB

Alaska Resource Data File

A comprehensive database of Alaskan mineral deposits compiled from the published literature and from unpublished reports and data from industry, the US Bureau of Land Management, and USGS.

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Site	Status	Commodities
Unnamed (west flank of Takotna M...	Inactive	Ag
Unnamed (south flank of Takotna ...	Inactive	Ag
Unnamed (east flank of Takotna M...	Inactive	Ag;Cu

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.

Database Home

Sample ID	Sample source	Sample notes
CHQ005	stream/river	stream
CHQ016	stream/river	stream
CHQ060	stream/river	stream
CHQ067	stream/river	stream
CHQ073	stream/river	stream
CHQ076	stream/river	stream
CHQ080	stream/river	stream
CHQ094	stream/river	stream
CHQ095	stream/river	stream
CHQ187	stream/river	stream
CHQ328	stream/river	stream
CHQ381	stream/river	stream
CHR512	stream/river	moss-trapped sediments;; stream
CHR515	stream/river	moss-trapped sediments;; stream
CHR516	stream/river	moss-trapped sediments;; stream
CHR517	stream/river	moss-trapped sediments;; stream
CHR533	stream/river	moss-trapped sediments;; stream
CHR547	stream/river	moss-trapped sediments;; stream
CHR568	stream/river	moss-trapped sediments;; stream
CHR569	stream/river	moss-trapped sediments;; stream
CHR589	stream/river	moss-trapped sediments;; stream
CHR692	stream/river	moss-trapped sediments;; stream
CHR803	stream/river	moss-trapped sediments;; stream
CHR808	stream/river	moss-trapped sediments;; stream

National Geochemical Database: Concentrate

Geochemistry of concentrates from the National Geochemical Database. Primarily inorganic elemental concentrations, most samples are from the continental US and Alaska.

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Sample ID	Sample source	Sample notes
CHQ506	stream/river	stream
CHQ514	stream/river	stream
CHQ525	stream/river	stream
CHQ526	stream/river	stream
CHQ538	stream/river	stream
CHQ569	stream/river	stream
CHQ581	stream/river	stream
CHQ598	stream/river	stream
CHQ599	stream/river	stream
CHQ815	stream/river	stream
CHQ875	stream/river	stream

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.

Database Home

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
Western Alaska Range	porphyry copper	Cretaceous porphyry prospects along the Kahiltna Basin-Peninsula terrane boundary
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.