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.
Name: Tomboy & Eureka
Elevation: 4,199 Feet (1,280 Meters)
Lat, Long: 39.48611, -120.87917
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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
Primary: Tomboy & Eureka
Record Type: Site
Operation Category: Past Producer
Operation Type: Unknown
Years of Production:
Deposit Size: S
General Physiographic Area: Pacific Mountain System
Physiographic Province: Cascade-Sierra Mountains
Physiographic Section: Sierra Nevada
Mineral Deposit Model
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.
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
"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.