Scientific data near [38.22000,-120.78000]

Search area extends approximately 2.2 km east-west and 2.8 km north-south.

Geographic context

Counties, states, countries, continents, or oceans
Calaveras	county
California	state
United States	country
North America	continent
Land	continent
Map quadrangles, from USGS or Canadian NTS
Valley Springs	quadrangle 1:24,000 scale
San Andreas	quadrangle 1:100,000 scale
Sacramento	quadrangle 1:250,000 scale
Watershed boundaries (USGS hydrologic units)
Lower Calaveras-Mormon Slough	hydrologic unit
San Joaquin	hydrologic accounting unit
San Joaquin	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
Miocene nonmarine rocks	CA	Oligocene to Pleistocene
Mesozoic volcanic rocks, unit 2 (Western Sierra Foothills and Western Klamath Mountains)	CA	Jurassic
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
Mother Lode North	M-Dz	Mother Lode North 3669 line km with spacing 0.80 km over parts of CA
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
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

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
5191452	1980-04-24	Stream sediment sample from dry stream, sieved to less than 149 microns (-100 mesh), and dried (if necessary) at less than or equal to 110øC.

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.

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Record	Type	Comment
Gillam

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
Spring Valley	Past Producer	AU
Unknown	Occurrence	CU
Unknown	Occurrence	AU
Hangill J.R. Gillam	Occurrence	AU
Spring Valley	Occurrence	AU
Gilliam Mine	Past Producer	CR FE
Unnamed Location	Unknown	CU
Mountain Gold Dredging Co	Unknown	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.

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Deposit name	Deposit type	Location
Mcnamara Property	Producer	California, United States
Gilliam Mine	Past Producer	California, United States
Valley Springs	unclassified	California, United States
Valley Springs Area	Occurrence	California, United States
Gillam Mine	Producer	California, United States

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
C240700	stream/river	NURE Archived Stream Sediment

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
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

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Feature ID	Feature type	Feature name
Mine Shaft	point
Mine Shaft	point
Mine Shaft	point
Mine Shaft	point
Mine Shaft	point
Mine Shaft	point
Mine Shaft	point
Mine Shaft	point
Mine Shaft	point
Mine Shaft	point
Mine Shaft	point
Mine Shaft	point
Mine Shaft	point
Mine Shaft	point
Prospect Pit	point
Tailings - Dredge	polygon
Tailings - Undifferentiated	polygon