Holst-Weeks Prospect

The Holst-Weeks Prospect is a mine located in Sonoma 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.

Site Name

Primary: Holst-Weeks Prospect
Secondary: Holst
Secondary: Weeks

Commodity

Tertiary: Manganese

Location

State: California
County: Sonoma

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: ASSAY 39.7 PERCENT SILICA, 2.0 PERCENT IRON OXIDES, 31.4 PERCENT MANESE.

Materials

Not available

Comments

Comment (Location): LOCATED IN N. CENTER SECTION 1

Comment (Geology): GEOL.DESC: 5 TO 7 FT. THICK MASS OF METAMORPHOSED CHERT IS MOSTLY BRIGHT YELLOW, AND ALTERS TO EARTHY LIMONITIC MATERIAL. WITHIN THE CHERT ARE IRREGULAR MASSES OF RESINOUS, BROWN TO RED AND DULL BUFF MATERIAL EVIDENTLY A RESULT OF METAMORPHISM OF MANGANIFEROUS OPAL AND SILICEOUS CARBONATE. GREENSTONE IS FOUND 10 YARDS AWAY, IN PLACE. BLACK MANGANESE OXIDES ARE FOUND IN JOINTS IN MANGANESE BEARING MATERIAL.

References

Reference (Deposit): D.O.M. BULL. 152 1950 P. 284

Reference (Deposit): D.O.M. BULL. 125 1943 P. 187

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 at Where to Find Gold in California.