Scientific data near [57.66889,-136.07666]

Search area extends approximately 1.1 km east-west and 2.1 km north-south.

Geographic context

Counties, states, countries, continents, or oceans
Sitka	Borough
Alaska	state
United States	country
North America	continent
Land	continent
Map quadrangles, from USGS or Canadian NTS
Sitka C-7	1:63,360 Alaska quadrangle
Sitka	1:250,000 Alaska quadrangle
Watershed boundaries (USGS hydrologic units)
Baranof-Chicagof Islands	hydrologic unit
190102	hydrologic accounting unit
Arctic Slope	hydrologic subregion
Alaska	hydrologic region
Areas administered by US Federal agencies
West Chichagof-Yakobi Wilderness	Wilderness
Wilderness FS	Type of land area
FS	Federal land areas administered by FS
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
Ksg	Sedimentary	Sitka Graywacke, undivided
Qs	Unconsolidated	Unconsolidated surficial deposits, undivided
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
Southeastern Alaska	M-D	Southeastern Alaska 12364 line km with spacing 9.60 km over parts of AK
Sitka '78	M-D	Sitka '78 5536 line km with spacing 0.80 km over parts of AK
Sitka	M/R-D	Sitka 579 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-SE03	Low-sulfide Au-quartz veins
AK-SE10	Basaltic Cu
AK-SE11	Cyprus massive sulfide

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
Chugach	Accretionary wedge	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
CCX459	sediment
CCX661	concentrate	panned only concentrate
LEQ001	rock
LEQ002	rock
LEQ003	rock
LEQ004	rock
LEQ005	rock
LEQ006	rock
LEQ059	sediment
LEQ060	sediment
LER181	rock	sedimentary sandstone
LER182	rock	sedimentary sandstone
LER183	rock	sedimentary siltstone
LER184	rock	sedimentary siltstone

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
LEQ001	unspecified
LEQ002	unspecified
LEQ003	unspecified
LEQ004	unspecified
LEQ005	unspecified
LEQ006	unspecified
LEQ007	unspecified
LEQ008	unspecified
LEQ009	unspecified
LEQ010	unspecified

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
Chichagof Consolidated	Occurrence	AU
Helen-Chichagof Creek 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
Helen Chichagof; Creek Group	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
CCX459	stream/river	stream
LEQ059	stream/river	precious metal mineralization;; Helene Chichagof, collected by USBM;; stream
LEQ060	stream/river	precious metal mineralization;; Chichagof Ck, collected by USBM;; 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
CCX661	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.