Scientific data near [56.99577,-135.12908]

Search area extends approximately 8.9 km east-west and 16.3 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
Port Alexander D-4	1:63,360 Alaska quadrangle
Port Alexander	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
Kkbm	Tectonite	Khaz Complex
Kkbm	Tectonite	Khaz Complex
Ksg	Sedimentary	Sitka Graywacke, undivided
Ksg	Sedimentary	Sitka Graywacke, undivided
Qs	Unconsolidated	Unconsolidated surficial deposits, undivided
Toegr	Igneous - Plutonic	Granitic rocks
w		Water
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	M/R-D	Sitka 579 line km with spacing 9.60 km over parts of AK
Port Alexander	M/R-D	Port Alexander 514 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-SE10	Basaltic Cu
AK-SE11	Cyprus massive sulfide
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
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
D343210	concentrate	panned C2 fraction
D343212	concentrate	panned C2 fraction
D343241	concentrate	panned C3 fraction
D343243	concentrate	panned C3 fraction
D512690	rock	sedimentary graywacke
D512691	rock
D512692	rock
D564118	rock	igneous diorite
D564119	rock	metamorphic schist
F003181	sediment
F003183	sediment
F003212	sediment
F003214	sediment
F003243	sediment
F003245	sediment
F005436	concentrate	panned C1 fraction

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
7020501	1979-09-04	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
3022124	1979-09-04	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
D512690	sedimentary	graywacke
D512691	unspecified
D512692	unspecified
D564119	metamorphic	schist

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
Silver Bay Gold-Copper Prospect	Occurrence	AU CU
Bauer Gold Prospect	Occurrence	AU
Eureka Gold?-Copper Prospect	Occurrence	CU AU
Cache Gold Mine	Past Producer	AU AG
Stewart	Past Producer	AU AG
Silver Bay	Prospect	AU AG
Bauer	Prospect	AU
Eureka	Prospect	AU
Trepple H	Prospect	NI
Patton	Prospect	AU
Edgecumbe Exploration Placer	Prospect	AU
Baranof Queen	Prospect	AU
Green Lake Group	Prospect	AU
Edgecumbe Exploration Lode	Prospect	AU
Gold Reef	Prospect	AU
Wicked Fall	Prospect	AU
Henrietta	Prospect	AU
Lower Ledge	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
No Name	Probably inactive	Au
Baranof Queen	Probably inactive	Au?
Silver Bay	Probably inactive	Au;Cu
Henrietta	Probably inactive	Au?
Edgecumbe Exploration; Bonanza N...	Probably inactive	Au
Eureka	Probably inactive	Au
Green Lake	Probably inactive	Au
Bonanza #1	Probably inactive
Patton	Probably inactive	Au?
Lower Ledge; Haley and Rogers	Probably inactive	Au
Stewart	Undetermined	Au
Bauer; Haley and Rogers	Probably inactive	Au
Edgecumbe Exploration (Placer)	Undetermined	Au
Trepple H	Undetermined	Ni
Edgecumbe Exploration (Lode)	Probably inactive	Au

An index to PGE-Ni-Cr deposits and occurrences in selected mineral-occurrence databases (web-accessible database)

A compendium of references to previously published databases and database records that describe PGE, nickel, and chromium deposits and occurrences. These data show where to obtain more detailed information about each deposit or occurrence.

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Deposit name	Deposit type	Location
Trepple H	Occurrence	Alaska, United States

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
F003181	stream/river	ss, -10, Ni;; stream
F003183	stream/river	ss, -10, Au;; stream
F003212	stream/river	ss, -60, Ni;; stream
F003214	stream/river	ss, -60, Au;; stream
F003243	stream/river	ss, -200, Ni;; stream
F003245	stream/river	ss, -200, Au;; 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
D343210		heavy mineral conc, C2 frac;
D343212		heavy mineral conc, C2 frac;
D343241		heavy mineral conc;
D343243		heavy mineral conc;
F005434	stream/river	heavy mineral conc, C1 frac;; stream
F005436	stream/river	heavy mineral conc, C1 frac;; 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
Adit	point
Adit	point
Adit	point	Mine
Adit	point	Mine
Adit	point