The Chaney Winship-Doak, Winship-Donovan is a manganese 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.
Chaney Winship-Doak, Winship-Donovan MRDS details
Site Name
Primary: Chaney Winship-Doak, Winship-Donovan
Commodity
Primary: Manganese
Location
State: California
County: Alameda
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
Owner Name: Frank J. Rodriguez
Production
Not available
Deposit
Record Type: Site
Operation Category: Producer
Operation Type: Unknown
Years of Production:
Organization:
Significant: N
Deposit Size: S
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
Not available
Materials
Ore: Rhodochrosite
Comments
Comment (Production): IT IS REPORTED THAT 200 TONS OF ORE WAS SHIPPED FROM THIS MINE DURING WWI. THE CARBONATE ORE PROBABLY CONTAINS AT LEAST 35 % MANGANESE. THE PROSPECT LIES 2 MILES BY ROAD AND AN ADDITIONAL 2 MILES BY AN OLD WAGON ROAD FROM THE ARROYO MOCHO ROAD, 15 1/2 MILES FROM LIVERMORE. AT LEAST TWO THIN BEDS OF HIGH-GRADE RHODOCHROSITE ARE EXPOSED IN THE WORKINGS; THESE RANGE FROM 6 INCHES TO 1 FT. IN THICKNESS. IN SOME PLACES THE ORE IS NEARLY PURE, COARSE-GRAINED CARBONATE, BUT IN MOST PLACES IS A BANDED MISTURE OF RHODOCHROSITE AND NEOTOCITE
Comment (Workings): INCLINED SHAFT 35 FT. DEPTH; 75 FT. BELOW SHAFT COLLAR A TUNNEL SAID TO BE 215 FT. LONG, AND IS SAID TO BE CONNECTED TO SHAFT BY A COMPLICATED SERIES OF WORKINGS
Comment (Geology): GEOL.DESC: BED OF MANGANESE OXIDE IN WHITE CHERT; RANGING FROM 1 - 5 FT. AVE 2.5 FT. THICK. OXIDE ORE GRADES DOWNWARD INTO RHODOCHROSITE - NEOTOCITE ORE. SOME PLACES ORE NEARLY PURE COARSE GRAINED CARBONATE.
Comment (Location): LOCATED NE 1/4 OF SECTION 12
References
Reference (Deposit): CALIF. JOUR. MINES & GEOL. V. 46, NO.2, APRIL, 1950, P.343, PL. 58
Reference (Deposit): DOM BULL. 125, P.97
Reference (Deposit): BULL. 152, P.18-19
Reference (Deposit): BULL. 140 , PL. 1 (GEOLOGY)
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.
