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  3. Mineral Resource Data System (MRDS)

Alma

Past Producer in Alameda county in California, United States with commodities Copper, Sulfur
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Sections on this page
  1. Identification information
  2. Geographic coordinates
  3. Site location context
  4. Geographic areas
  5. Public Land Survey System information
  6. Commodities
  7. Materials information
  8. Host and associated rocks
  9. Nearby scientific data
  10. Geologic structures
  11. Ore body information
  12. Controls for ore emplacement
  13. Economic information about the deposit and operations
  14. Workings at the site
  15. Links to other databases
  16. Bibliographic references
  17. Reporter information

Geologic information

Identification information

Deposit ID 10036253
MRDS ID M024332
Record type Site
Current site name Alma

Geographic coordinates

Geographic coordinates: -122.17215, 37.80379 (WGS84)

Site location context

Political divisions (FIPS codes)

Alameda(county)

California(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Oakland East(quadrangle 1:24,000 scale)

San Francisco(quadrangle 1:100,000 scale)

San Francisco(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

San Francisco Bay(hydrologic unit)

San Francisco Bay(hydrologic accounting unit)

San Francisco Bay(hydrologic subregion)

California(hydrologic region)

Federal lands

LG(Federal land areas administered by LG)

Geographic areas

Country State County
United States California Alameda

Public Land Survey System information

Meridian Township Range Section Fraction State
Mount Diablo 001S 003W 34 California

Commodities

Commodity Importance
Copper Primary
Sulfur Secondary

Comments on the commodity information

  • PYRITE IS MAJOR ORE COMPONENT

Materials information

Materials Type of material
Bornite Ore
Chalcocite Ore
Chalcopyrite Ore
Pyrite Ore
Sphalerite Ore

Analytical data

Result 1% CU

Host and associated rocks

  • Host or associated Host
    Rock type Volcanic Rock (Aphanitic) > Felsic Volcanic Rock > Rhyolite
    Stratigraphic age (youngest) Pliocene

Nearby scientific data

(1) -122.17215, 37.80379
ListMap

Economic information

Geologic structures

Type of structure Local
Structure description Hayward Fault: Two Parallel Smaller Faults With Horizontal Displacement.

Ore body information

  • General form LENTICULAR
    Thickness 5.49M

Controls for ore emplacement

  • Fractures

Comments on the geologic information

  • GEOL.DESC: GEOLOGY SIMILAR TO LEONA HEIGHTS MINE SAME ORE ZONE.

Economic information about the deposit and operations

Development status Past Producer
Commodity type Both
Deposit size Medium
Significant No

Comments on the production information

  • PRODUCTION VALUES FOR THE ALMA: NOT AVAILABLE COMBINED VALUES FOR ALMA AND LEONA HEIGHTS ARE GIVEN UNDER LEONA HEIGHT.

Workings at the site

  • Type of workings Underground
    Length 1524M

Reference information

Bibliographic references

  • 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.

  • Deposit

    ERIC, J.H., 1948: COPPER IN CALIFORNIA BULL. 144: DIV. OF MINES, P-212

  • Deposit

    LAIZURE, C.V., 1929: SAN FRANCISCO FIELD DIV.; 25TH REPT. STATE MIN.; CALIF DIV. OF MINES P. 440.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-FEB-1978 Fraticelli, L. A. (Albers, J.) U.S. Geological Survey

Beyond USGS

Supplemental information added by qvyshift.com. Not part of the original USGS MRDS record.

Maps centered on this site

Authoritative California resources

These are landing pages for further research — the state agencies don't currently expose per-mine deep links.