Scientific data near [67.25000,-156.50000]

Search area extends approximately 0.1 km east-west and 0.4 km north-south.

Geographic context

Counties, states, countries, continents, or oceans
Northwest Arctic	Borough
Alaska	state
United States	country
North America	continent
Land	continent
Map quadrangles, from USGS or Canadian NTS
Ambler River B-2	1:63,360 Alaska quadrangle
Ambler River	1:250,000 Alaska quadrangle
Ambler River B-1	1:63,360 Alaska quadrangle
Ambler River	1:250,000 Alaska quadrangle
Ambler River A-2	1:63,360 Alaska quadrangle
Ambler River	1:250,000 Alaska quadrangle
Ambler River A-1	1:63,360 Alaska quadrangle
Ambler River	1:250,000 Alaska quadrangle
Watershed boundaries (USGS hydrologic units)
Middle Kobuk River	hydrologic unit
190503	hydrologic accounting unit
South Central 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
DPxaqm	Metamorphic	Quartz-mica schist of the Brooks Range

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
Baird Mtns.-Ambler River	M-Dz	Baird Mtns.-Ambler River 14323 line km with spacing 1.20 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-BR07	Kuroko massive sulfide
AK-BR04	Low-sulfide Au-quartz veins
AK-BR13	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
Brooks Range	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
M140023	rock	metamorphic metarhyolite
M140024	rock	metamorphic metarhyolite
M140025	rock	metamorphic metarhyolite
M140026	rock	metamorphic metarhyolite
M140027	rock	metamorphic metarhyolite
M140028	rock	metamorphic metarhyolite
M140029	rock	metamorphic metarhyolite
M140030	rock	metamorphic metarhyolite

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
Brooks Range	porphyry copper	Proterozoic, Devonian, or Cretaceous grantitic intrusions in the Brooks Range.
Chukotka	porphyry copper	Early to Late Cretaceous volcanic and intrusive rocks composing island-arc, continental-arc, and collisional magmatic belts associated with the Chukotka microcontinent.
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.