The Jones Group is a manganese mine located in Santa Clara county, California at an elevation of 2,720 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: 2,720 Feet (829 Meters)
Commodity: Manganese
Lat, Long: 37.38861, -121.41611
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.
Jones Group MRDS details
Site Name
Primary: Jones Group
Commodity
Primary: Manganese
Location
State: California
County: Santa Clara
Land Status
Land ownership: Private
Note: the land ownership field only identifies whether the area the mine is in is generally on public lands like Forest Service or BLM land, or if it is in an area that is generally private property. It does not definitively identify property status, nor does it indicate claim status or whether an area is open to prospecting. Always respect private property.
Holdings
Not available
Workings
Not available
Ownership
Not available
Production
Not available
Deposit
Record Type: Site
Operation Category: Producer
Operation Type: Unknown
Years of Production:
Organization:
Significant: N
Deposit Size: L
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
Name: Chert
Role: Host
Age Type: Host Rock
Age Young: Late Cretaceous
Analytical Data
Analytical Data: AVERAGE GRADE 35 TO 45 PERCENT MANGANESE
Materials
Ore: Rhodochrosite
Comments
Comment (Geology): ORE HOSTED IN FRANCISCAN COMPLEX--L. TO L. ; GEOL.DESC: ORE OCCURS IN MASSIVE WHITE CHERT INTERBEDDED IN THIN-BEDDED RED CHERT AND SHALE, FOUND IN A ZONE 250 FT. THICK, SURROUNDED BY SANDSTONE. GENERAL STRIKE IS N.W., DIPPING 50 TO 80 S.W. MINOR FOLDS AND FAULTS ARE PRESENT. 3 TYPES OF ORE OCCUR; IN DEPOSIT I ARE HIGH GRADE MASSIVE BLACK OXIDE BEDS 3 TO 5 FT. THICK, WHICH GRADE IN RHODOCHROSITE AT A DEPTH OF ABOUT 50 FT. THE OTHER DEPOSITS CONTAIN LOW GRADE SILICEOUS BLACK OXIDE.
Comment (Location): LOCATED IN NW 1/4 SECTION 27 , GROUP CONSISTS OF 5 DEPOSITS.
References
Reference (Deposit): U.S.B.M. R.I. 5254
Reference (Deposit): CALIF. BUREAU OF MINES AND GEO. V. 50 , NO. 2 APR. 1954 , P. 413
Reference (Deposit): D.O.M. BULL. 152 1950 PP. 251 - 253
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.
