Scientific data near [48.62000,-121.89000]

Search area extends approximately 8.9 km east-west and 13.5 km north-south.

Geographic context

Counties, states, countries, continents, or oceans
Skagit	county
Washington	state
United States	country
North America	continent
Land	continent
Map quadrangles, from USGS or Canadian NTS
Hamilton	quadrangle 1:24,000 scale
Mount Baker	quadrangle 1:100,000 scale
Concrete	quadrangle 1:250,000 scale
Watershed boundaries (USGS hydrologic units)
Nooksack	hydrologic unit
Puget Sound	hydrologic accounting unit
Puget Sound	hydrologic subregion
Pacific Northwest	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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Unit	State	Lithology
Carboniferous-Permian sedimentary and volcanic rocks	WA	Devonian to Permian, minor Mesozoic
Pre-Upper Jurassic metamorphic rocks of the low-grade zone	WA	Jurassic
Glacial drift, undivided	WA	Pleistocene
Tertiary dunite intrusive rocks	WA	Late Cretaceous

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
Puget Lowlands C (East)	M-D	Puget Lowlands C (East) 7290 line km with spacing 0.80 km over parts of WA
Twin Sisters	M-Dz	Twin Sisters 1673 line km with spacing 1.60 km over parts of WA
Concrete	M/R-D	Concrete 1799 line km with spacing 9.60 km over parts of WA

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
PC12	Massive sulfide, Sierran kuroko	Mesozoic
PC36	Low-sulfide Au-quartz vein	Mesozoic

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
Franciscan	Accretionary wedge	Western Cordillera

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
M192166	metamorphic	greenstone
M192167	metamorphic	metabasalt

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
Twin Sisters Mtns	Occurrence	CR
Twins Group	Occurrence	CR FE
Mcmaster and Alma Claims	Occurrence	CR FE
Meadow Claim	Occurrence	CR
Three Lakes Group	Occurrence	CR
Mcmaster Claims	Occurrence	CR FE
Leader Claim	Occurrence	CR
Three Lakes South	Prospect	CR FE
Twin Sisters Pit and Mill	Past Producer	STN_C
Meadow	Prospect	CR
Hornet Claim	Occurrence	CR
E.N.H. Prospect	Occurrence	CR
Northwest-International Pit	Producer	SDG
Hamilton Mill	Producer	MG
Three Lakes North	Prospect	CR
Three Lakes	Prospect	CR
Leader	Prospect	CR
Hornet	Unknown	CR
Nooksack Pit	Past Producer	SDG
E.N.H.	Unknown	CR
Scheel Quarry	Producer	MG
Twin Sister Magnesium & Chrome Corp	Occurrence	CR MG

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
Hornet	unclassified	Washington, United States
E.N.H.	unclassified	Washington, United States
Second Basin Group	Occurrence	Washington, United States
Leader Claim	Occurrence	Washington, United States
Mcmaster Claims	Occurrence	Washington, United States
Three Lakes Group	Occurrence	Washington, United States
Twin Sisters Mtns	Occurrence	Washington, United States
Hornet Claim	Occurrence	Washington, United States
Bellingham Claims	Occurrence	Washington, United States
E.N.H. Prospect	Occurrence	Washington, United States
Meadow Claim	Occurrence	Washington, United States
Mcmaster and Alma Claims	Occurrence	Washington, United States
Three Lakes North	Occurrence	Washington, United States
Three Lakes	Occurrence	Washington, United States
Three Lakes South	Occurrence	Washington, United States
Leader	Occurrence	Washington, United States
Twin Sister Magnesium & Chrome Corp	Occurrence	Washington, United States
Bellingham Group	Occurrence	Washington, United States
Meadow	Occurrence	Washington, United States
Twins Group	Occurrence	Washington, United States

Active mines and mineral plants in the US

Mine plants and operations for commodities monitored by the National Minerals Information Center of the USGS. Operations included are those considered active in 2003 and surveyed by the USGS.

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Record	Type	Comment
Twin Sisters Quarry-Hamilton

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
Cascade Arc	porphyry copper	U.S. part of a continental margin arc that formed during subduction of the Pacific and Juan de Fuca plates beneath western North America
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
Cordilleran Continental Arc	porphyry copper	Porphyry Cu systems associated with predominantly calc-alkalic igneous rocks of post-accretionary continental magmatic arcs (Jurassic-Eocene)
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
Quarry	point
Open Pit Mine	point
Open Pit Mine	polygon

Critical mineral deposits of the United States

Mineral deposit information drawn from USGS databases, industry reports, and scientific literature totalling 681 individual mineral deposits documented to contain critical minerals. Data are provided in Esri file geodatabase, Microsoft Excel, shapefile, and CSV formats.

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Deposit name	Deposit type	Critical minerals
Meadow-Leader	Chromite	chromium