Scientific data near [56.50580,-132.09310]

Search area extends approximately 4.5 km east-west and 8.1 km north-south.

Geographic context

Counties, states, countries, continents, or oceans
Map quadrangles, from USGS or Canadian NTS
Petersburg C-1	1:63,360 Alaska quadrangle
Petersburg	1:250,000 Alaska quadrangle
Watershed boundaries (USGS hydrologic units)
Southeast Mainland	hydrologic unit
190101	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
Kmgr	Igneous - Plutonic	Granitic rocks of central and southeast Alaska
Pzgn	Metamorphic	Roof pendants of the Coast plutonic complex of Brew and Morrell (1979b)
Qs	Unconsolidated	Unconsolidated surficial deposits, undivided

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
Petersburg '78	M-D	Petersburg '78 13920 line km with spacing 1.60 km over parts of AK
Petersburg	M/R-D	Petersburg 1472 line km with spacing 9.60 km over parts of AK
Stikine - Groundhog Basin	M/EM-D	Stikine - Groundhog Basin 423 line km with spacing 0.40 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-SE05	Sierran Kuroko mass. sulf.
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
Taku	Passive margin	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
C104298	sediment
C104884	sediment
C104885	sediment
CCY624	concentrate	panned C3 fraction
CCY758	sediment
CDK511	concentrate	panned C3 fraction
CER068	sediment
CER069	sediment
CFB354	concentrate	panned C3 fraction
CFB355	concentrate	panned C3 fraction
CFJ508	rock	igneous intermediate
CFJ590	rock	igneous intermediate
CFJ591	rock	igneous felsic
CFJ600	rock	igneous granite
D221882	sediment
M153880	rock	igneous granite

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
7001724	1979-09-19	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
3001778	1979-09-19	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
CFJ508	igneous	intermediate
CFJ590	igneous	intermediate
CFJ591	igneous	felsic
CFJ600	igneous	felsic
M153880	igneous	granodiorite

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 Porterfield Creek	Unknown	SN
Unnamed (near Porterfield Creek)	Occurrence	SN

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 (near Porterfield Creek)	Undetermined	Sn

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
C104298	stream/river	stream deposit; REANALYZED STR SED:ORIG RASS JOBNO 11107;TAGNO CCY758;FIELDNO 0260; stream
C104299	stream/river	stream deposit; REANALYZED STR SED:ORIG RASS JOBNO 11107;TAGNO CCY760;FIELDNO 0262; stream
C104884	stream/river	stream deposit; REANALYZED STR SED:ORIG RASS JOBNO 11747;TAGNO CER068;FIELDNO 1391; stream
C104885	stream/river	stream deposit; REANALYZED STR SED:ORIG RASS JOBNO 11747;TAGNO CER069;FIELDNO 1391A; stream
CCY758	stream/river	stream
CCY760	stream/river	stream
CER068	stream/river	stream
CER069	stream/river	stream
D221882	stream/river	gravel; sandy; silty;; stream
D221884	stream/river	gravel; sandy; silty;; 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
CCY624	stream/river	stream
CCY626	stream/river	insufficient sample - data qualitative;; stream
CDK511	stream/river	stream
CDK513	stream/river	stream
CFB354	stream/river	stream
CFB355	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.