The Alma is a copper 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.
Alma MRDS details
Site Name
Primary: Alma
Commodity
Primary: Copper
Secondary: Sulfur
Location
State: California
County: Alameda
Land Status
Not available
Holdings
Not available
Workings
Type: Underground
Ownership
Not available
Production
Not available
Deposit
Record Type: Site
Operation Category: Past Producer
Operation Type: Unknown
Years of Production:
Organization:
Significant: N
Deposit Size: M
Physiography
General Physiographic Area: Pacific Mountain System
Physiographic Province: Pacific Border Province
Physiographic Section: California Coast Ranges
Mineral Deposit Model
Not available
Orebody
Form: LENTICULAR
Structure
Type: L
Description: Hayward Fault: Two Parallel Smaller Faults With Horizontal Displacement.
Alterations
Not available
Rocks
Name: Rhyolite
Role: Host
Age Type: Host Rock
Age Young: Pliocene
Analytical Data
Analytical Data: 1% CU
Materials
Ore: Chalcopyrite
Ore: Chalcocite
Ore: Bornite
Ore: Sphalerite
Ore: Pyrite
Comments
Comment (Production): PRODUCTION VALUES FOR THE ALMA: NOT AVAILABLE COMBINED VALUES FOR ALMA AND LEONA HEIGHTS ARE GIVEN UNDER LEONA HEIGHT.
Comment (Geology): GEOL.DESC: GEOLOGY SIMILAR TO LEONA HEIGHTS MINE SAME ORE ZONE.
Comment (Commodity): PYRITE IS MAJOR ORE COMPONENT
References
Reference (Deposit): DAVIS, F.F., 1950: MINES AND MINERAL RESOURCES OF ALAMEDA COUNTY; CALIF. JOUR. MINES AND GEOLOGY, 001 46, NO.2 DIV OF MINES, P. 290.
Reference (Deposit): ERIC, J.H., 1948: COPPER IN CALIFORNIA BULL. 144: DIV. OF MINES, P-212
Reference (Deposit): LAIZURE, C.V., 1929: SAN FRANCISCO FIELD DIV.; 25TH REPT. STATE MIN.; CALIF DIV. OF MINES P. 440.
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.
