The Black Jack is a manganese mine located in Alameda county, California at an elevation of 2,280 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: 2,280 Feet (695 Meters)
Commodity: Manganese
Lat, Long: 37.5925, -121.61111
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.
Black Jack MRDS details
Site Name
Primary: Black Jack
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: Leslie Holm
Years: 1950 -
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
Not available
Comments
Comment (Location): LOCATED IN NW 1/4 NE 1/4 SECTION 14
Comment (Production): PAST PRODUCTION IS 40 TONS. MINE LIES 750 FT. FROM THE ARROYO MOCHO ROAD. THE ORE BODY RANGES IN THICKNESS FROM 1.7 TO 4 FT. AND AVERAGES 2.5 FT. IT LIES PARALLEL TO THE BEDDING OF THE ENCLOSING GRAY RADIOLARIAN CHERT AND SHALE. THE STRIKE RANGES FROM N. 25 DEG. E. TO N. 20 DEG. W. AND THE DIP FROM 25 DEG. TO 55 DEG. W
Comment (Workings): DRIFT 60 FT. TO ORE BODY, CONTINUES 30 FT.FARTHER FOLLOWING ORE BODY ALONG A COURSE N.20 DEG W,RAISE 8 FT., SECOND DRIFT FOLLOWS ORE BODY ALONG A COURSE N. 10 DEG. W FOR 40 FT.
Comment (Geology): GEOL.DESC: ORE BODY IS IN A BED OF MASSIVE GREY CHERT, WITH IRREGULAR POCKETS OF SILICEOUS OXIDE ORE. THE CHERT AND THE ORE ARE CUT BY NUMEROUS VEINS OF QUARTZ. THE ORE BODY LIES PARALLEL TO BEDDING OF ENCLOSING RADIOLARIN CHERTS AND SHALES.
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.16
Reference (Deposit): BULL 140 , P. 66 , 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.
