Scientific data near [55.21277,-131.52251]

Search area extends approximately 4.5 km east-west and 7.8 km north-south.

Geographic context

Counties, states, countries, continents, or oceans
Map quadrangles, from USGS or Canadian NTS
Ketchikan A-5	1:63,360 Alaska quadrangle
Ketchikan	1:250,000 Alaska quadrangle
Watershed boundaries (USGS hydrologic units)
Ketchikan	hydrologic unit
190101	hydrologic accounting unit
Arctic Slope	hydrologic subregion
Alaska	hydrologic region

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
DOgi	Igneous - Plutonic	Syenite, trondhjemite, and granite
KJdg	Igneous - Plutonic	Diorite and gabbro of southeast Alaska
KJgn	Sedimentary	Gravina-Nuzotin unit
KJgv	Sedimentary	Volcanic rocks of the Gravina-Nutzotin belt
SOmi	Metamorphic	Heterogeneous metamorphic rocks, southeast Alaska
Trhgs	Sedimentary	Hyd Group sedimentary rocks, undivided
Trhgs	Sedimentary	Hyd Group sedimentary rocks, undivided
Trhgv	Sedimentary	Hyd Group igneous rocks, undivided
Trhgv	Sedimentary	Hyd Group igneous rocks, 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
Ketchikan '76	M-Dz	Ketchikan '76 8529 line km with spacing 1.60 km over parts of AK
Annette Island	M-D	Annette Island 997 line km with spacing 0.40 km over parts of AK
Ketchikan	M/R-D	Ketchikan 1609 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-SE13	Polymetallic vein
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
Alexander	Oceanic arc	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
CHY947	rock	igneous greenstone
CHY952	rock	igneous felsic
CHY953	rock	igneous felsic
CHY957	rock	igneous mafic
CHY958	rock	metamorphic phyllite-slate
CHY959	rock	igneous mafic
CHY960	rock	metamorphic phyllite-slate
CHY961	rock	igneous mafic
CHY962	rock	sedimentary chert
CHY963	rock	metamorphic phyllite-slate
CHY964	rock	igneous mafic
CHY965	rock	igneous intermediate
CHY966	rock	igneous greenstone
CHY967	rock	sedimentary chert
CHY968	rock	sedimentary chert
CHY969	rock	igneous mafic
CHY970	rock	igneous mafic
CHY971	rock	sedimentary chert
CHY972	rock	igneous intermediate
CHY973	rock	igneous mafic
CHY974	rock	metamorphic phyllite-slate
CJL262	rock	igneous intermediate
CJL263	rock	igneous intermediate
CJL266	rock
CJL387	rock	igneous felsic
CJL388	rock	igneous felsic
CJL413	rock	metamorphic phyllite-slate
CJL414	rock	metamorphic phyllite-slate
CJL415	rock	metamorphic phyllite-slate
CJL416	rock	metamorphic phyllite-slate
CJL417	rock	igneous unspecified
CJL418	rock
M184035	rock	igneous greenstone
M184036	rock	igneous diorite

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
7022006	1979-09-23	Wet natural-pond (or lake in Alaska) sediment sample dried at less than or equal to 100øC and sieved to -100 mesh through stainless steel sieves.
7022007	1979-09-23	Wet natural-pond (or lake in Alaska) 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
3023639	1979-09-23	Natural-pond (or lake in Alaska) water sample acidified to a pH of less than or equal to 1 with reagent-grade nitric acid.
3023640	1979-09-23	Natural-pond (or lake in Alaska) 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
CHY952	igneous	felsic
CHY953	igneous	felsic
CHY957	igneous	mafic
CHY958	metamorphic	phyllite-slate
CHY959	igneous	mafic
CHY960	metamorphic	phyllite-slate
CHY961	igneous	mafic
CHY962	unspecified	chert-jasperoid
CHY963	metamorphic	phyllite-slate
CHY964	igneous	mafic
CHY965	igneous	intermediate
CHY966	igneous	mafic
CHY967	unspecified	chert-jasperoid
CHY968	unspecified	chert-jasperoid
CHY969	igneous	mafic
CHY970	igneous	mafic
CHY971	unspecified	chert-jasperoid
CHY972	igneous	intermediate
CHY973	igneous	mafic
CHY974	metamorphic	phyllite-slate
CJL262	igneous	intermediate
CJL263	igneous	intermediate
CJL387	igneous	felsic
CJL413	metamorphic	phyllite-slate
CJL414	metamorphic	phyllite-slate
CJL415	metamorphic	phyllite-slate
CJL416	metamorphic	phyllite-slate
CJL417	igneous	unspecified
CJL418	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
Unnamed (near Bush Mountain)	Occurrence	AG AU CU
Unnamed (southwest ridge of Bush Mountain)	Occurrence	AG AU CR CU MO NI PB
Unnamed (near Helen Todd Lake)	Occurrence	PB

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
Unnamed (near Bush Mountain)	Undetermined	Ag;Au;Cu
Unnamed (southwest ridge of Bush...	Undetermined	Ag;Au;Cr;Cu;Mo;Ni;Pb
Unnamed (near Helen Todd Lake)	Undetermined	Pb

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
Unnamed (southwest ridge of Bush Mountain)	Occurrence	Alaska, United States

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.