Tomboy & Eureka

The Tomboy & Eureka is a gold mine located in Sierra county, California at an elevation of 4,199 feet.

About the MRDS Data:

All mine locations were obtained from the USGS Mineral Resources Data System. The locations and other information in this database have not been verified for accuracy. It should be assumed that all mines are on private property.

Mine Info

Name: Tomboy & Eureka  

State:  California

County:  Sierra

Elevation: 4,199 Feet (1,280 Meters)

Commodity: Gold

Lat, Long: 39.48611, -120.87917

Map: View on Google Maps

Satelite View

MRDS mine locations are often very general, and in some cases are incorrect. Some mine remains have been covered or removed by modern industrial activity or by development of things like housing. The satellite view offers a quick glimpse as to whether the MRDS location corresponds to visible mine remains.


Satelite image of the Tomboy & Eureka

Tomboy & Eureka MRDS details

Site Name

Primary: Tomboy & Eureka


Commodity

Primary: Gold


Location

State: California
County: Sierra


Land Status

Not available


Holdings

Not available


Workings

Type: Surface/Underground


Ownership

Not available


Production

Not available


Deposit

Record Type: Site
Operation Category: Past Producer
Operation Type: Unknown
Years of Production:
Organization:
Significant: N
Deposit Size: S


Physiography

General Physiographic Area: Pacific Mountain System
Physiographic Province: Cascade-Sierra Mountains
Physiographic Section: Sierra Nevada


Mineral Deposit Model

Not available


Orebody

Not available


Structure

Not available


Alterations

Not available


Rocks

Not available


Analytical Data

Not available


Materials

Ore: Gold
Ore: Pyrite
Gangue: Quartz


Comments

Comment (Deposit): VEIN

Comment (Geology): TOMBOY VEIN, OF QTZ & PORPHYRY, W GABBRO WALLS, 6-7 FT THICK STRIKES NE, DIPS 60-75S, W ABUNDANT SULFIDES. EUREKA VEIN 3-5 FT THICK, STRIKES N, DIPS FLAT TO E, W ORE IN QTZ LENSES. ADJOINS KATE HARDY MINE. BOTH VEINS EXHIBIT POST-MINERAL SHEARING. IN LOWER EUREKA TUNNEL, A DIKE OF GRANITE 3 FT THICK CUTS GABBRO & IS CUT BY SHEAR ZONES ACCOMPANYING VEIN. POST MINERAL SHEARING HAS LEFT QTZ OF EUREKA VEIN MUCH CRUSHED, IRREGULAR, IN PLACES ABSENT. WALL ROCK CARBONATE ALTERATION NOT PROMINENT EXCEPT CLOSE TO VEIN.

Comment (Production): NO OTHER PRODUCTION RECORD FOUND

Comment (Workings): 2 ADITS, 1 SHAFT AT TOMBOY, SEVERAL SHAFTS & ADITS AT EUREKA, SURFACE CUTS.


References

Reference (Deposit): MCCULLOCH, W. C., OESTERLING, W. A., SPURCK, W. H., & TISCHLER, M. S., 1964 , MINERALS FOR INDUSTRY N CALIF: SO PACIFIC COMPANY, VOL 2, P 45.

Reference (Deposit): AVERILL, C. V., 1942 , MINES AND MINERAL RESOURCES OF SIERRA CO: CDM CALIF. JOUR. MINES AND GEOL, VOL 38, NO 1, P 66.

Reference (Deposit): FERGUSON, H. G., & GANNETT, R. W., 1932 , GOLD QTZ VEINS OF THE ALLEGHANY DISTRICT, CALIF.;: USGS PROF PAPER 172, P 90, 91, FIG 25.

Reference (Deposit): MACBOYLE, E. 1920 , MINES AND MINERAL RESOURCES SIERRA CO: CSMB 16TH REPORT STATE MINERALOGIST, DEC 1918 , P 129, 130.

Reference (Production): MACBOYLE, 1920


California Gold

Where to Find Gold in California

"Where to Find Gold in California" looks at the density of modern placer mining claims along with historical gold mining locations and mining district descriptions to determine areas of high gold discovery potential in California. Read more at Where to Find Gold in California.