Scientific data near [55.59280,-131.96790]

Search area extends approximately 4.5 km east-west and 7.9 km north-south.

Geographic context

Counties, states, countries, continents, or oceans
Ketchikan Gateway	Borough
Alaska	state
United States	country
North America	continent
Land	continent
Map quadrangles, from USGS or Canadian NTS
Ketchikan C-6	1:63,360 Alaska quadrangle
Ketchikan	1:250,000 Alaska quadrangle
Watershed boundaries (USGS hydrologic units)
Southeast Mainland	hydrologic unit
190101	hydrologic accounting unit
Arctic Slope	hydrologic subregion
Alaska	hydrologic region
Areas administered by US Federal agencies
Tongass National Forest	National Forest
National Forest FS	Type of land area
FS	Federal land areas administered by FS

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
KJgv	Sedimentary	Volcanic rocks of the Gravina-Nutzotin belt
Kum	Igneous - Plutonic	Ultramafic rocks of southeast Alaska
MzPzss	Metamorphic	Metasedimentary and minor metavolcanic rocks along the west side of the Coast plutonic complex of Brew and Morrell (1979b)
MzPzss	Metamorphic	Metasedimentary and minor metavolcanic rocks along the west side of the Coast plutonic complex of Brew and Morrell (1979b)
w		Water

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
Craig 1982	M-D	Craig 1982 9221 line km with spacing 0.80 km over parts of AK
Ketchikan '76	M-Dz	Ketchikan '76 8529 line km with spacing 1.60 km over parts of AK
Ketchikan	M/R-D	Ketchikan 1609 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-SE13	Polymetallic vein
AK-SE03	Low-sulfide Au-quartz veins

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
Taku	Passive margin	Alaska
Alexander	Oceanic arc	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
C151848	sediment
CAS117	rock	metamorphic phyllite
CCJ162	sediment
CCJ163	sediment
CCJ168	sediment
CEP511	rock	igneous unspecified
CEP512	rock	metamorphic meta-andesite
CEP513	rock	metamorphic meta-andesite
CHG578	concentrate	panned C3 fraction
CHG583	concentrate	panned C3 fraction
CHG651	sediment
CHG658	sediment

National geochemical survey database

National-scale geochemical analysis of stream sediments and soils in the US, from existing data, reanalysis of existing samples, and new sampling. Goal for sample density is one per 289 square km.

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Sample ID	Material	Source
C-151848	Sediment	Stream, Wet

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
7022205	1979-09-14	Wet stream sediment sample dried at less than or equal to 100øC and sieved to -100 mesh through stainless steel sieves.
7022206	1979-09-14	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.

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Sample ID	Date collected	Sample type
3023838	1979-09-14	Stream water sample acidified to a pH of less than or equal to 1 with reagent-grade nitric acid.
3023839	1979-09-14	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
CAS117	metamorphic	phyllite
CEP511	igneous	unspecified
CEP512	metamorphic	meta-andesite
CEP513	metamorphic	meta-andesite

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
Kingston	Prospect	AU
New Adit	Prospect	AU
Mary T.	Prospect	AU CU
U.S.	Prospect	AU
Little Maumee	Prospect	AU CU
Blue Bucket	Prospect	AU CU
Mary T	Prospect	CU AU
Smugglers Cove	Past Producer	AU CU PB AG
Blue Bucket	Prospect	AU
Little Maumee	Prospect	AU
Kingston Group	Prospect	AU

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
Little Maumee	Undetermined	Au
Kingston	Undetermined	Au
New Adit	Undetermined	Au
Mary T.	Undetermined	Au
U.S.	Undetermined	Au
Blue Bucket; Beach Adit	Undetermined	Au

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
C151848	surface
CCJ162	stream/river	stream
CCJ163	stream/river	stream
CCJ168	stream/river	stream
CHG651	stream/river	stream
CHG658	stream/river	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
CHG578	stream/river	stream
CHG583	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.

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Tract name	Deposit type	Geology
Late Continental Arc	porphyry copper	Porphyry Cu systems associated with predominantly calc-alkalic igneous rocks of post-accretionary continental magmatic arcs (Oligocene-Pliocene)
Intermontane Island-Arc	porphyry copper	Porphyry Cu systems associated with pre-accretionary Triassic and Jurassic calc-alkalic island arcs that formed offshore of western North America
Intermontane Island-Arc Cu-Au	porphyry copper	Triassic and Jurassic alkalic igneous rocks of accreted island arcs that formed offshore of western North America
Insular Mixed Island- and Continental Arc	porphyry copper	Calc-alkalic igneous rocks of accreted Jurassic island-arc terranes
Cordilleran Continental Arc	porphyry copper	Porphyry Cu systems associated with predominantly calc-alkalic igneous rocks of post-accretionary continental magmatic arcs (Jurassic-Eocene)
Southeast Alaska Tertiary	porphyry copper	Tertiary subduction and postsubduction calc-alkalic plutons of southeast Alaska
Alaska Peninsula and Aleutian Islands	porphyry copper	Tertiary felsic to intermediate composition intrusions of the Alaska Peninsula and Aleutian Islands
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.

Prospect- and mine-related features on USGS topographic maps

Symbols indicating mining-related features digitized from historical USGS topographic maps in the western part of the conterminous US. Includes prospect pits, mine shafts and adits, quarries, open-pit mines, tailings piles and ponds, gravel and borrow pit

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Feature ID	Feature type	Feature name
Open Pit Mine	point	Alaska Gold Mtn Mines
Adit	point
Open Pit Mine	polygon	Alaska Gold Mtn Mines