Scientific data near [61.82416,-149.24861]

Search area extends approximately 2.2 km east-west and 4.7 km north-south.

Geographic context

Counties, states, countries, continents, or oceans
Matanuska-Susitna	Borough
Alaska	state
United States	country
North America	continent
Land	continent
Map quadrangles, from USGS or Canadian NTS
Anchorage D-6	1:63,360 Alaska quadrangle
Anchorage	1:250,000 Alaska quadrangle
Watershed boundaries (USGS hydrologic units)
Lower Susitna River	hydrologic unit
190205	hydrologic accounting unit
Northwest Alaska	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
Klgr	Igneous - Plutonic	Intermediate granitic rocks
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
Talkeetna-Anchorage	M-Dz	Talkeetna-Anchorage 28968 line km with spacing 1.20 km over parts of AK
Talkeetna-Anchorage	M-Dz	Talkeetna-Anchorage 28968 line km with spacing 1.20 km over parts of AK
Anchorage '82	M-D	Anchorage '82 6389 line km with spacing 1.60 km over parts of AK
Anchorage	M/R-D	Anchorage 2172 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-SC15	Sierran Kuroko mass. sulf.
AK-SC11	Low-sulfide Au-quartz veins, Chugach type
AK-SC21	Porphyry Cu, BC-Ak type
AK-SC28	Polymetallic vein
AK-SC31	Cu (Au) skarn
AK-SC25	Placer Au

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
Wrangellia	Oceanic arc	Alaska

Radiometric ages of rocks from Alaska

Radiometric ages of rocks or minerals sampled from Alaska. The data were collected from professional publications and/or received from researchers and used by permission.

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Record	Type	Comment
60AGz40

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
CBB300	rock
CBB301	rock	igneous quartz diorite
CBB302	rock
CFW113	sediment
CFW289	concentrate	panned C3 fraction
D254367	rock	igneous trondhjemite
LFZ144	rock	igneous granite
LFZ146	rock
LFZ147	rock
LFZ148	rock
LFZ149	rock
LFZ150	rock
LFZ151	rock

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
7000838	1977-07-26	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
3000867	1977-07-26	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
CBB297	unspecified
CBB298	unspecified
CBB299	igneous	granite
CBB300	unspecified
CBB301	igneous	quartz diorite
CBB302	unspecified
D254367	igneous	trondhjemite
LFZ139	igneous	aplite

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
Fern	Unknown	AU PB TE W
Talkeetna	Past Producer	AU MO
Talkeetna	Prospect	AU MO AG
Little Gem (Hatcher)	Prospect	AU
Fern	Past Producer	AU PB MO AG W
Fern	Past Producer	AU PB TE W
Little Gem	Prospect	AU AG
Rutland	Prospect	AU
Giant Gold Mining Company	Prospect	AU
Old Joe 1-2	Prospect	AU
Fern Mine	Past Producer	AU PB W AS

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
Fern; Fern Gold Mining Co.; Fern...	Inactive	Au
Talkeetna; Matanuska Gold Mining...	Inactive	Au
Giant Gold Mining Company	Inactive	Au?
Rutland	Inactive	Au?
Little Gem (Hatcher); Little Gem...	Inactive	Au

National Geochronological Database

Radiometric ages of geological materials by K-Ar, Rb-Sr, Sm-Nd, fission track, and U-Th-Pb dating methods. A revision of DDS-14 correcting locations and providing the data in more convenient formats.

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Sample ID	Sample source	Rock name
15382	Outcrop or artificial surface exposure	Tonalite

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
CFW113	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
CFW289	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
Yukon-Tanana Upland	porphyry copper	Kluane Arc and Tertiary Kuskokwim Mountains volcanic-plutonic belt (continuation of Canadian Cordilleran continental arc); north of the Denali Fault
Western Alaska Range	porphyry copper	Cretaceous porphyry prospects along the Kahiltna Basin-Peninsula terrane boundary
Eastern Alaska Range and Wrangell Mountains	porphyry copper	Cretaceous (115-105Ma) deposits and prospects along the Nutzotin Basin-Wrangellia terrane boundary; south of the Denali Fault
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	Fern Mine
Open Pit Mine	point	Talkeetna Mine