Scientific data near [57.91190,-136.34770]

Search area extends approximately 4.5 km east-west and 8.4 km north-south.

Geographic context

Counties, states, countries, continents, or oceans
Map quadrangles, from USGS or Canadian NTS
Sitka D-8	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
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
Jise	Igneous - Plutonic	Granitic rocks of southeast Alaska
KJdg	Igneous - Plutonic	Diorite and gabbro of southeast Alaska
KJse	Igneous - Plutonic	Saint Elias suite of Gordey and Makepeace (2003) and similar rocks
Kkbm	Tectonite	Khaz Complex
Kkbm	Tectonite	Khaz Complex
Toegr	Igneous - Plutonic	Granitic rocks
Trn	Igneous - Volcanic	Nikolai and Goon Dip Greenstones and equivalent rocks
TrPzbi	Metamorphic	Metamorphic rocks of Baranof Island
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
Gulf of Alaska	M-Dz	Gulf of Alaska 30899 line km with spacing 0.80 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-SE07	Porphyry Cu
AK-SE19	Porphyry Cu, skarn related
AK-SE10	Basaltic Cu
AK-SE03	Low-sulfide Au-quartz veins
AK-SE13	Polymetallic vein
AK-SE20	Porphyry Cu-Mo

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
C198506	rock	metamorphic greenstone
C198507	rock	metamorphic greenstone
CCX039	sediment
CCX163	concentrate	panned only concentrate
CCX207	rock
CCX208	rock
CCX209	rock
CCX210	rock
CCX211	rock
CDC399	rock	metamorphic phyllite-slate
CDC400	rock	metamorphic phyllite-slate
CDC401	rock	igneous intermediate
CDC402	rock	igneous intermediate
EFD979	concentrate	panned C3 fraction
LEQ792	rock	igneous mafic
LEQ793	rock	igneous mafic
LEQ794	rock	igneous mafic
LEQ795	rock	igneous mafic
LER400	rock	igneous mafic
LER401	rock	igneous mafic
LER714	rock	metamorphic greenstone
LER715	rock	igneous mafic
LER716	rock	metamorphic greenstone
LER717	rock	igneous mafic
LER973	rock	igneous unspecified
LER980	rock	igneous unspecified
M142485	rock	metamorphic greenstone
M142486	rock	metamorphic greenstone

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
C198506	metamorphic
C198507	metamorphic
CCX207	unspecified
CCX208	unspecified
CCX209	unspecified
CCX210	unspecified
CCX211	unspecified
CDC399	metamorphic	phyllite-slate
CDC400	metamorphic	phyllite-slate
CDC401	igneous	intermediate
CDC402	igneous	intermediate
CDC622	metamorphic	gneiss
CDC623	metamorphic	gneiss
LEQ792	igneous	mafic
LEQ793	igneous	mafic
LEQ794	igneous	mafic
LEQ795	igneous	mafic
LER400	igneous	mafic
LER401	igneous	mafic
LER714	igneous	mafic
LER715	igneous	mafic
LER716	igneous	mafic
LER717	igneous	mafic
LER973	igneous	unspecified
LER980	igneous	unspecified
M142485	metamorphic	greenstone
M142486	metamorphic	greenstone

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
Stag Bay Iron-Copper Prospect	Occurrence	FE CU
Stag Bay Copper	Prospect	FE CU
Stag Bay Group	Prospect	CU FE

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 (southeast of mouth of S...	Probably inactive	Cu;Fe
Unnamed (southeast of mouth of S...	Probably inactive	Cu;Fe

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
CCX039	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.

Database Home

Sample ID	Sample source	Sample notes
CCX163	stream/river	stream
EFD979	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.