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Alma

Occurrence in Alameda county in California, United States with commodities Sulfur-Pyrite, Copper, Silver
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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. Nearby scientific data
  8. Economic information about the deposit and operations
  9. Land status
  10. Ownership information
  11. Links to other databases
  12. Bibliographic references
  13. General comments
  14. Reporter information

Geologic information

Identification information

Deposit ID 10027996
MRDS ID M004711
Record type Site
Current site name Alma

Geographic coordinates

Geographic coordinates: -122.17937, 37.79657 (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)

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
Sulfur-Pyrite Primary
Copper Primary
Silver Primary

Economic information

Economic information about the deposit and operations

Development status Occurrence
Commodity type Metallic
Significant No
Discovery year 1892

Land status

Ownership category Private

Ownership information

  • Type Owner
    Owner Leota C. Reed
    First year 1950

Comments on the production information

  • 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

Comments on the workings information

  • WAS DEVELOPED BY 5000 FT. OF TUNNELS AND DRIFTS; OLD WORKINGS WERE BURNED & A NEW ADIT WAS DRIVEN AT A LOWER LEVEL.

Reference information

Bibliographic references

  • Deposit

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

  • Deposit

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

  • Deposit

    USBM IC-7898,P.5

General comments

Subject category Comment text
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

Reporter information

Type Date Name Affiliation Comment
Reporter 01-JUN-1972 Gere, W. 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.