The Great Expectation Mine is a mine located in Santa Clara 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.
Great Expectation Mine MRDS details
Site Name
Primary: Great Expectation Mine
Commodity
Tertiary: Manganese
Location
State: California
County: Santa Clara
Land Status
Not available
Holdings
Not available
Workings
Not available
Ownership
Not available
Production
Not available
Deposit
Record Type: Site
Operation Category: Occurrence
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: ORE GRADE 35 TO 40 PERCENT MANGANESE, 15 PERCENT SILICA.
Materials
Ore: Rhodochrosite
Comments
Comment (Geology): GEOL.DESC: ORE BODY IS MASSIVE LENS LYING WITHIN BEDDED RADIOLARIAN CHERTS AND SHALES, PARALLEL TO THEIR BEDDING. GENERAL STRIKE IS N 70 W, DIPPING 45 S. CHERT IS WHITE OR PINK AND THIN-BEDDED TO MASSIVE. ORE IS UNDERLAIN BY THIN-BEDDED GREEN SHALES AND CHERTS, WITH SHARP CONTACTS. ORE IS MOSTLY MANGANESE OXIDE WITH RESIDUAL SILICA PATCHES. CARBONATE IS FOUND INSIDE BLOCKS AS A GRAY ORE, PINK RHODOCHROSITE, AND A BROWN CARBONATE (SIDERITE?). THE 2 DEFINITE ORE HORIZONS ARE 100 FT. APART STRATIGRAPHICALLY.
Comment (Location): UTM APPROX
References
Reference (Deposit): D.O.M. BULL. 152 1950 PP. 250 - 251
Reference (Deposit): D.O.M. BULL. 125 1943 P. 177
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.
