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
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.
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" 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: Where to Find Gold in California.
