Alma

The Alma is a sulfur-pyrite, copper, and silver 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.

Site Name

Primary: Alma

Commodity

Primary: Sulfur-Pyrite
Primary: Copper
Primary: Silver

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: Leota C. Reed
Years: 1950 -

Production

Not available

Deposit

Record Type: Site
Operation Category: Occurrence
Operation Type: Unknown
Discovery Year: 1892
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

Not available

Materials

Not available

Comments

Comment (Production): ORIGINALLY OPENED IN 1892 AND PRODUCED PRINCIPALLY SULPHURIC ACID, UNTIL 1934. NO PYRITE MINED AFTER 1934. COPPER PRODUCED FROM RESIDUE AFTER EXTRACTION OF SULPHURIC ACID AND FROM LEACHING THE DUMP, AMOUNTED TO 375,000 LB. OF COPPER 1929-35, AND $85.00. LATER SOME SMALL PRODUCTION IN 1942 AND 1944. SOME SILVER AND A LITTLE GOLD ALSO PRODUCED AS BY-PRODUCTS. (THE FIGURE FOR COPPER PRODUCTION INCLUDES THAT FROM THE NEARBY LEONA MINE IN SEC. 3-2S-3W). THE PYRITE CONTAINED SOME CHALCOPYRITE, AND SOME SECONDARY COPPER MINERALS, BOOTHITE, CHALCANTHITE, AND PISANITE

Comment (Workings): WAS DEVELOPED BY 5000 FT. OF TUNNELS AND DRIFTS; OLD WORKINGS WERE BURNED & A NEW ADIT WAS DRIVEN AT A LOWER LEVEL.

Comment (Deposit): ADD. REF. NO.4. MINERAL INF. SVCE. V. 11, NO.5, P.2; NO.5. DOM BULL. 176, P.450, 451, 619; NO.6 USGS SAN FRANCISCO FOLIO, NO. 193, P22

References

Reference (Deposit): USBM IC-7898,P.5

Reference (Deposit): CALIF. JOUR. MINES & GEOL. V. 46, NO.2, APRIL 1950, P.296, 305 & 306, 340, PL. 58

Reference (Deposit): DOM BULL. 144, P. 212 (SHOWS MANY OTHER REFS)

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.