Scientific data near [57.56305,-135.91055]

Search area extends approximately 4.5 km east-west and 8.3 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
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-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.

Database Home

Lab ID	Sample medium	Description
CCX105	rock
CCX106	rock
CCX107	rock
CCX108	rock
CCX109	rock
CCX434	sediment
CCX438	sediment
CCX631	concentrate	panned only concentrate
CCX635	concentrate	panned only concentrate
CDC767	rock
CDC768	rock
CDC769	rock
CDC828	rock
CDC829	rock
CDC830	rock
CDC831	rock
CDC832	rock
CDC833	rock
CDC834	rock
CDC835	rock
CDC836	rock
CDC837	rock
CDC838	rock
CDC839	rock
CDC840	rock
CDC841	rock
CDC842	rock
CDC843	rock
CDC844	rock
CDC845	rock
CDC846	rock
CDC847	rock
CDC848	rock
CDC849	rock
CDC850	rock
CDC851	rock
CDC852	rock
CDC853	rock
CDC854	rock
CDC855	rock
CDC856	rock
CDC857	rock
CDC858	rock
CDC859	rock
CDC860	rock
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
LEI737	rock
LEI738	rock
LEQ067	sediment
LEQ068	sediment
LEQ081	sediment
LEQ130	rock
LEQ131	rock
LEQ132	rock
LEQ133	rock
LEQ134	rock
LEQ135	rock
LEQ184	rock
LEQ185	rock
LEQ186	rock
LEQ187	rock
LEQ188	rock
LER408	rock	metamorphic schist
LER409	rock	metamorphic schist
LER410	rock	sedimentary sandstone
LER411	rock	sedimentary sandstone
LER412	rock	sedimentary claystone
LER413	rock	sedimentary claystone
LER548	rock	igneous intermediate
LER549	rock	igneous intermediate
LER550	rock	sedimentary volcaniclastic
LER551	rock	sedimentary sandstone
LER552	rock	sedimentary sandstone
LER553	rock	sedimentary siltstone
LER834	rock
LER835	rock
LER836	rock
LER837	rock
LER838	rock
LER839	rock
LER840	rock
LER841	rock
M139234	rock	metamorphic metavolcanic
M147497	rock	sedimentary chert
M147498	rock	sedimentary chert
M147499	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
CCX105	unspecified
CCX107	unspecified
CCX108	unspecified
CCX109	unspecified
CDC767	unspecified
CDC768	unspecified
CDC769	unspecified
CDC828	unspecified
CDC829	unspecified
CDC830	unspecified
CDC831	unspecified
CDC832	unspecified
CDC833	unspecified
CDC834	unspecified
CDC835	unspecified
CDC836	unspecified
CDC837	unspecified
CDC838	unspecified
CDC839	unspecified
CDC840	unspecified
CDC841	unspecified
CDC842	unspecified
CDC843	unspecified
CDC844	unspecified
CDC845	unspecified
CDC846	unspecified
CDC847	unspecified
CDC848	unspecified
CDC849	unspecified
CDC850	unspecified
CDC851	unspecified
CDC852	unspecified
CDC853	unspecified
CDC854	unspecified
CDC855	unspecified
CDC856	unspecified
CDC857	unspecified
CDC858	unspecified
CDC859	unspecified
CDC860	unspecified
LEI737	unspecified
LEI738	unspecified
LEQ130	unspecified
LEQ131	unspecified
LEQ132	unspecified
LEQ133	unspecified
LEQ134	unspecified
LEQ135	unspecified
LEQ184	unspecified
LEQ185	unspecified
LEQ186	unspecified
LEQ187	unspecified
LEQ188	unspecified
LER408	metamorphic	schist
LER409	metamorphic	schist
LER410	sedimentary	sandstone
LER411	sedimentary	sandstone
LER412	sedimentary	claystone
LER413	sedimentary	claystone
LER548	igneous	intermediate
LER549	igneous	intermediate
LER550	metamorphic	quartzite
LER551	sedimentary	sandstone
LER552	sedimentary	sandstone
LER553	sedimentary	siltstone
LER834	unspecified
LER835	unspecified
LER836	unspecified
LER837	unspecified
LER838	unspecified
LER839	unspecified
LER840	unspecified
LER841	unspecified
M139234	metamorphic	metavolcanic
M147497	sedimentary	chert
M147498	sedimentary	chert
M147499	sedimentary	chert
M147506	sedimentary	chert
M147708	sedimentary	chert
M147709	sedimentary	chert

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
Falcon Arm Gold Prospect	Occurrence	AU AG PB ZN
Falcon Arm	Prospect	AU PB AG ZN
Eldorado	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.

Database Home

Site	Status	Commodities
El Dorado	Undetermined	Au
Falcon Arm	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.

Database Home

Sample ID	Sample source	Sample notes
CCX434	stream/river	stream
CCX438	stream/river	stream
LEQ067	stream/river	precious metal mineralization;; head Falcon Arm, collected by USBM;; stream
LEQ068	stream/river	precious metal mineralization;; head Falcon Arm, collected by USBM;; stream
LEQ081	stream/river	precious metal mineralization;; Falcon Arm adit strm, 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.

Database Home

Sample ID	Sample source	Sample notes
CCX631	stream/river	stream
CCX635	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.

Database Home

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.