Scientific data near [39.01000,-120.81000]

Search area extends approximately 8.9 km east-west and 11.5 km north-south.

Geographic context

Counties, states, countries, continents, or oceans
Placer	county
California	state
United States	country
North America	continent
Land	continent
Map quadrangles, from USGS or Canadian NTS
Foresthill	quadrangle 1:24,000 scale
Truckee	quadrangle 1:100,000 scale
Chico	quadrangle 1:250,000 scale
Watershed boundaries (USGS hydrologic units)
North Fork American	hydrologic unit
Lower Sacramento	hydrologic accounting unit
Sacramento	hydrologic subregion
California	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
Jurassic marine rocks, unit 1 (Western Sierra Nevada and Western Klamath Mountains)	CA	Triassic to Late Jurassic
Undivided pre-Cenozoic metavolcanic rocks, unit 2 (undivided)	CA	Paleozoic(?) to Mesozoic(?)
Paleozoic marine rocks, undivided, unit 4 (Western Sierra Nevada)	CA	Ordovician to Triassic
Tertiary pyroclastic and volcanic mudflow deposits, unit 9 (Cascade Range)	CA	Tertiary (2-24 Ma)
Ultramafic rocks, chiefly Mesozoic, unit 2 (Western Sierra Nevada and Klamath Mountains)	CA	Late Proterozoic(?) to Early Jurassic

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
North Sierra Foothills	M-D	North Sierra Foothills 8481 line km with spacing 0.80 km over parts of CA
Chico	M/R-D	Chico 4869 line km with spacing 4.80 km over parts of CA-NV
Sacramento	M/R-D	Sacramento 5005 line km with spacing 4.80 km over parts of CA

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
PC03	Skarn Cu	Mesozoic
PC03	Skarn Cu	Mesozoic
PC08	Porphyry Cu	Mesozoic
PC08	Porphyry Cu	Mesozoic
PC17	Massive sulfide, Sierran kuroko	Jurassic
PC40	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
Calaveras-Baker	Accretionary wedge	Western Cordillera

National geochemical survey database

National-scale geochemical analysis of stream sediments and soils in the US, from existing data, reanalysis of existing samples, and new sampling. Goal for sample density is one per 289 square km.

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Sample ID	Material	Source
C-257520	Sediment	Stream, Wet

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
5190011	1980-04-30	Soil sample sieved to less than 149 microns (-100 mesh).

Asbestos mines, prospects, and occurrences in the US

Location and mineralogical characteristics of former mines, prospects, and occurrences of asbestos in the continental US. No asbestos producing mines are currently active. Data here are drawn from several previously published reports.

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Deposit name	Deposit type	Location
unnamed occurrence (near Forest Hill)	occurrence	Placer, CA
unnamed occurrence (in Lady's Canyon)	occurrence	Placer, CA

Podiform chromite deposits

Location and characteristics of 1,124 individual mineral deposits of this type, with grade and tonnage models for chromium as well as several related elements.

Database Home

Record	Type	Comment
Mountain View
Washout Claim
Buttercup Chrome
Poco Tiempo
Black Rock Chrome

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
Forest Hill District	Past Producer	AU AG PGE_PT CU ZN FE PB IN
Ruby Consolidated	Past Producer	CR AU FE
Three Queens	Past Producer	AU PB
Mountain View Group, Victory Chrome Co.	Producer	CR
Washout Claim	Past Producer	CR FE
Michigan Bluff	Occurrence	NI
Trench	Past Producer	AU
Garfield	Past Producer	AU
Dry Hill and Blue Jay	Past Producer	AU
Doherty Prospect	Past Producer	AU
West Quartz	Past Producer	AU
Washout Claim	Past Producer	CR
Hill-Top Chrome	Occurrence	CR
Ogle	Producer	CR
Lookout and K.K.	Past Producer	AU
Dewey and Stocker	Past Producer	AU
Little Greek Claims	Producer	CR
Apex	Occurrence	CR
Marigold Occurrence	Occurrence	CR
Duffey Lease	Past Producer	CR
Josephine	Past Producer	AU
Ferrier Diggings	Past Producer	AU
Washington Mine	Past Producer	AU
Lehigh Canyon Patent Property	Producer	CR
Chrome Divide	Past Producer	CR
Coal Pit, Bunker Mine	Occurrence	CR
Black Rock Chrome Deposit	Past Producer	CR
Big Spring	Past Producer	AU
Prospect	Unknown	AU
Paragon Prospect	Occurrence	AU
Maus Tunnel	Unknown	AU
California & Virginia Placer Mines	Unknown	AU
Gray Eagle Cliff	Unknown	AU
Excelsior Claim	Past Producer	AU
Mountain Tunnel	Unknown	AU
Lucky Strike	Past Producer	CR
Donna's Stake	Occurrence	AU
Lehigh	Unknown	AU
Middle Fork	Occurrence	AU
Murzo Brass	Occurrence	AU
Josephine Shields	Occurrence	AU
Gray Eagle Cliff	Occurrence	AU
Eva Lode	Past Producer	AU
Moss Ledge	Producer	AU
Volcano	Producer	AU
Hope	Occurrence	AU
Edinborough	Occurrence	AU
Paragon	Producer	AU
Prospect	Unknown	AU
Winfred Shirley	Unknown	AU
E A Garrison Prospects	Occurrence	CR
Pegasus Mine	Occurrence	AU
Thundering Bar	Past Producer	AU AG
Florida & Tilton	Unknown	AU
Mosquito Ridge Mine	Unknown	AU
Unnamed Location	Occurrence	AU
Perkins Consolidated	Occurrence	AU
Middle Fork	Occurrence	AU
Mayflower	Past Producer	AU
Edinborough	Unknown	AU
Prospect	Unknown	AU
Lehigh Canyon Patent	Past Producer	CR
Small Hope	Past Producer	AU
Trench	Occurrence	AU
De Maria Mine	Past Producer	AU
Johnny Rafael	Past Producer	AU
Ben Franklin	Unknown	AU
West Quartz Claim	Unknown	AU
Adams Pit	Past Producer	AU
Perkins Cons	Past Producer	AU
Independence	Occurrence	AU
Unnamed	Past Producer	AU
Small Hope	Producer	AU
Prospects 2	Occurrence	AU
Unnamed	Past Producer	AU
Cooley	Unknown	AU
Perkins Consolidated	Occurrence	AU
Coal Pit	Past Producer	CR
Buckeye Hill	Unknown	AU
Poco Tiempo Quartz Mine	Past Producer	CR
Dewey & Stocker	Occurrence	AU
Pioneer Slope	Unknown	AU
Doherty	Occurrence	AU
Rough & Ready	Unknown	AU
Unnamed Mine	Unknown	AU
El Dorado Mine	Occurrence	AU
Spanish	Unknown	AU
Little Greek Claims	Past Producer	CR
Horseshoe Bar	Past Producer	AU
Rio Del Oro	Past Producer	AU
Worthington	Unknown	AU
Breece & Wheeler	Past Producer	AU
Sellier	Unknown	AU
Ladies Canyon	Unknown	AU
California & Virginia	Past Producer	AU
Marigold	Past Producer	AU AG
Middle Fork	Past Producer	AU
Blue Rock	Past Producer	AU
Trench Yellow Jacket	Occurrence	AU
Unnamed	Past Producer	AU
Excelsior Claim	Producer	AU
Adams Pit	Producer	AU
Big Spring	Producer	AU
Mayflower Gravel Mng Co	Producer	AU
Spanish Mines Consolidated	Producer	CR
Yankee Jim Deposit	Occurrence	MN
Baker Divide	Producer	AU
Iowa Hill	Unknown	AU
Buckeye Hill Flora	Occurrence	AU
Cooley	Occurrence	AU
Josephine	Occurrence	AU
Doherty	Past Producer	AU
Lucky Strike Occurrence	Past Producer	CR
Baltimore	Producer	AU
Independent	Producer	AU
Rio Del Oro	Producer	AU
Channel Bend Barnes, Bend, Gray Eagle Bar, Mccall	Occurrence	AU
California and Virginia	Occurrence	AU
Mayflower	Producer	AU
Carpenter Ranch	Unknown	AU
Baker Divide	Past Producer	AU
Doherty Prospect	Occurrence	AU
Pond Pit	Past Producer	AU
Mascot	Unknown	AU
Ogle	Past Producer	CR
Black Rock Chrome	Past Producer	CR
Marigold	Past Producer	AU AG
Josephine	Unknown	AU
Canothos	Unknown	AU
Moss Ledge	Past Producer	AU
Mountain View Group	Past Producer	CR
Josephine Mine	Unknown	AU
Homestake	Unknown	AU
Volcano	Past Producer	AU
Homestake	Occurrence	AU
Three Queens	Past Producer	AU
Mcaloney Placer	Unknown	AU
Dry Hill	Unknown	AU
Chrome Divide	Past Producer	CR
Barnes	Unknown	AU
Oro & Dardanelles	Unknown	AU
Murzo	Unknown	AU
Baltimore	Past Producer	AU
Spanish Mines Cons	Past Producer	CR
Blue Jay	Unknown	AU
Hope	Unknown	AU
Eva Lode	Unknown	AU
Independent	Past Producer	AU
Big Bend	Past Producer	AU AG
Duffy Property	Occurrence	AU

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.

Database Home

Deposit name	Deposit type	Location
Ogle	Producer	California, United States
Washout Claim	Past Producer	California, United States
Lucky Strike Occurrence	Past Producer	California, United States
Chrome Divide	Past Producer	California, United States
Spanish Mines Consolidated	Producer	California, United States
Mountain View Group, Victory Chrome Co.	Producer	California, United States
Black Rock Chrome Deposit	Past Producer	California, United States
Little Greek Claims	Producer	California, United States
Lehigh Canyon Patent Property	Producer	California, United States
Poco Tiempo Quartz Mine	Past Producer	California, United States
Black Rock Chrome	Past Producer	California, United States
Chrome Divide	Past Producer	California, United States
Coal Pit	Past Producer	California, United States
Spanish Mines Cons	Past Producer	California, United States
Mountain View Group	Past Producer	California, United States
Lehigh Canyon Patent	Past Producer	California, United States
Little Greek Claims	Past Producer	California, United States
Lucky Strike	Past Producer	California, United States
Washout Claim	Past Producer	California, United States
Apex	Occurrence	California, United States
Hill-Top Chrome	Occurrence	California, United States
Marigold Occurrence	Occurrence	California, United States
Coal Pit, Bunker Mine	Occurrence	California, United States
E A Garrison Prospects	Occurrence	California, United States
Michigan Bluff	Occurrence	California, United States
Duffey Lease	Past Producer	California, United States
Forest Hill District	Past Producer	California, United States

National Geochemical Database: Soil

Geochemical analysis of soil samples from the National Geochemical Database. Primarily inorganic elemental concentrations, most samples are from the continental US and Alaska.

Database Home

Sample ID	Sample source	Sample notes
C239059	unknown	NURE Archived SOILS

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.

Database Home

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
Sierran Arc	porphyry copper	A composite island-continental margin arc that formed during subduction of the Farallon Plate beneath western North America
Western U.S. and Sonoran Desert Jurassic Arc	porphyry copper	U.S. and Mexican parts of a composite island-continental margin arc that formed during subduction of the Farallon Plate beneath western North America

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

Database Home

Feature ID	Feature type	Feature name
Diggings	point	Placer Diggings
Gravel/Borrow Pit - Undifferentiated	point
Gravel/Borrow Pit - Undifferentiated	point
Gravel/Borrow Pit - Undifferentiated	point
Gravel/Borrow Pit - Undifferentiated	point
Gravel/Borrow Pit - Undifferentiated	point
Gravel/Borrow Pit - Undifferentiated	point
Gravel/Borrow Pit - Undifferentiated	point
Gravel/Borrow Pit - Undifferentiated	point
Gravel/Borrow Pit - Undifferentiated	point
Gravel/Borrow Pit - Undifferentiated	point
Gravel/Borrow Pit - Undifferentiated	point
Gravel/Borrow Pit - Undifferentiated	point
Gravel/Borrow Pit - Undifferentiated	point
Gravel/Borrow Pit - Undifferentiated	point
Gravel/Borrow Pit - Undifferentiated	point
Mine Shaft	point
Mine Shaft	point
Open Pit Mine	point
Open Pit Mine	point	Mayflower Mine
Open Pit Mine	point	Small Hope Mine
Open Pit Mine	point	Paragon Mine
Open Pit Mine	point	Pond Pit
Open Pit Mine or Quarry	point	Adams Pit
Placer Mine	point
Placer Mine	point	California & Virginia Placer Mines
Prospect Pit	point
Diggings	point	Placer Diggings
Gravel/Borrow Pit - Undifferentiated	point	Adams Pit
Mine Shaft	point
Open Pit Mine	point
Open Pit Mine	point	Paragon Mine
Open Pit Mine	point	Mayflower Mine
Open Pit Mine	point	Small Hope Mine
Open Pit Mine or Quarry	point
Open Pit Mine or Quarry	point	Pond Pit
Placer Mine	point	California & Virginia Placer Mine
Prospect Pit	point
Adit	point	Three Queens Mine
Adit	point	Three Queens Mine
Adit	point	Josephine Mine
Adit	point	Josephine Mine
Adit	point	San Francisco Mine
Adit	point	San Francisco Mine
Adit	point	Homestake Mine
Adit	point
Adit	point	Homestake Mine
Adit	point
Adit	point	Volcano Mine
Adit	point
Adit	point
Adit	point	Baltimore Mine
Adit	point	Baltimore Mine
Adit	point	Volcano Mine
Adit	point
Adit	point