The Dyer Prospect is a mine located in Alameda county, California.
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
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.
Dyer Prospect MRDS details
Site Name
Primary: Dyer Prospect
Commodity
Tertiary: Manganese
Location
State: California
County: Alameda
Land Status
Not available
Holdings
Not available
Workings
Not available
Ownership
Owner Name: Dyer (Estate)
Production
Not available
Deposit
Record Type: Site
Operation Category: Occurrence
Deposit Type: Residual
Operation Type: Unknown
Years of Production:
Organization:
Significant: N
Physiography
General Physiographic Area: Pacific Mountain System
Physiographic Province: Pacific Border Province
Physiographic Section: California Coast Ranges
Mineral Deposit Model
Not available
Orebody
Not available
Structure
Not available
Alterations
Not available
Rocks
Not available
Analytical Data
Analytical Data: PEBBLES ARE 30 TO 35 % MANGANESE
Materials
Ore: Psilomelane
Gangue: Pyrolusite
Comments
Comment (Production): NO PRODUCTION. IT IS DOUBTFUL IF MORE THAN 5 TONS OF ORE AVERAGING 30-35 PERCENT MANGANESE CAN BE FOUND ON THE PROPERTY. THE PROSPECT IS 1 MILE FROM ALTAMONT, ON THE WESTERN PACIFIC RR. THE SURFACE OF THE ORE CONSISTS OF TINY RADIATING NEEDLES OF WELL CRYSTALLIZED PYROLUSITE. HALF A MILE E OF THE MAIN OCCURENCE OF THE PEBBLES IS A BED OF LIMESTONE AND SHALY LIMESTONE CONGLOMERATE AMONG THE PEBBLES OF WHICH ARE A FEW PEBBLES OF WHITE CHERT AND MANGANESE OXIDE AND MAY BE THE SOURCE OF THE PEBBLES FARTHER WEST. MANNER OF OCCURRENCE INDICATES THE PROSPECT HAS LITTLE ECONOMIC VALUE.
Comment (Geology): GEOL.DESC: IRREGULAR PEBBLES OF HARD MANGANESE OXIDE OCCUR IN SOIL IN A ROUGHLY LINEAR BELT, WHICH IS 1/2 MILE LONG, 100 FT. WIDE, AND DIPS GENTLY E. PEBBLES ARE IRREGULAR IN SHAPE, AVE. 1 1/2 IN. DIAMETER, AND CONSIST OF INTERLACING VEINS OF PSILOMELANE IN A SOFT RUSTY-COLORED LIMY MATRIX.
References
Reference (Deposit): CALIF. JOUR. MINES & GEOL. V. 46, NO. 2, P. 344, PL. 58
Reference (Deposit): DOM BULL. 125, P.98
Reference (Deposit): BULL. 152, P.20
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.
