Jones Group

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

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.

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.