Scientific data near [57.56222,-135.90695]

Search area extends approximately 2.2 km east-west and 4.2 km north-south.

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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
Kkbm	Tectonite	Khaz Complex
Ksg	Sedimentary	Sitka Graywacke, undivided
KTrm	Tectonite	Kelp Bay Group, undivided
KTrm	Tectonite	Kelp Bay Group, 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
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
CCX105	rock
CCX434	sediment
CCX631	concentrate	panned only concentrate
D226983	rock	sedimentary volcaniclastic
LEI103	sediment
LEI104	sediment
LEI105	concentrate	panned only concentrate
LEI106	concentrate	panned only concentrate
LEI107	sediment
LEI108	concentrate	panned only concentrate
LEI109	sediment
LEI110	concentrate	panned only concentrate
LEI111	concentrate	panned only concentrate
LEI112	sediment
LEI113	concentrate	panned only concentrate
LER548	rock	igneous intermediate
LER549	rock	igneous intermediate
LER550	rock	sedimentary volcaniclastic
LER551	rock	sedimentary sandstone
M147497	rock	sedimentary chert
M147498	rock	sedimentary chert
M147506	rock	sedimentary volcaniclastic
M147708	rock	sedimentary volcaniclastic
M147709	rock	sedimentary volcaniclastic

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
LER408	metamorphic	schist
LER409	metamorphic	schist

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
CCX434	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
CCX631	stream/river	stream
LEI103	stream/river	SE arm Fords Arm, collected by USBM;; stream
LEI104	stream/river	SE arm Fords Arm, collected by USBM;; stream
LEI105	stream/river	SE arm Fords Arm, collected by USBM;; stream
LEI106	stream/river	SE arm Fords Arm, collected by USBM;; stream
LEI107	stream/river	SE arm Fords Arm, collected by USBM;; stream
LEI108	stream/river	SE arm Fords Arm, collected by USBM;; stream
LEI109	stream/river	SE arm Fords Arm, collected by USBM;; stream
LEI110	stream/river	SE arm Fords Arm, collected by USBM;; stream
LEI111	stream/river	SE arm Fords Arm, collected by USBM;; stream
LEI112	stream/river	SE arm Fords Arm, collected by USBM;; stream
LEI113	stream/river	SE arm Fords Arm, collected by USBM;; 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.