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Freitas Prospect

Occurrence in Alameda county in California, United States with commodity Manganese
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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. Ownership information
  10. Links to other databases
  11. Bibliographic references
  12. Reporter information

Geologic information

Identification information

Deposit ID 10027986
MRDS ID M004691
Record type Site
Current site name Freitas Prospect
Related records 10187043

Geographic coordinates

Geographic coordinates: -121.66381, 37.5988 (WGS84)

Site location context

Political divisions (FIPS codes)

Alameda(county)

California(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Mendenhall Springs(quadrangle 1:24,000 scale)

Stockton(quadrangle 1:100,000 scale)

San Jose(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 004S 003 08 California

Comments on the location information

  • LOCATED IN NE 1/4 OF SE 1/4 OF SECTION 8

Commodities

Commodity Importance
Manganese Critical Tertiary

Nearby scientific data

(1) -121.66381, 37.5988
ListMap

Economic information

Comments on the geologic information

  • GEOL.DESC: CUT EXPOSES A MASSIVE BED OF MANGANESE-BEARING MATERIAL, COMPOSED OF MAROON CHERT, FINELY POROUS PINK SILICA, AND STAINS AND FRACTURE FILLINGS OF MANGANESE OXIDES. THE RELATION OF THIS BODY TO THE ADJACENT ROCK IS UNCERTAIN, BUT IT APPEARS TO BE OVERLAIN TO THE SOUTH BY GREENSTONE.

Economic information about the deposit and operations

Development status Occurrence
Commodity type Metallic
Significant No

Ownership information

  • Type Operator
    Owner Freitas, William

Comments on the production information

  • TEN TONS OF MATERIAL HAS BEEN MINED AND STACKED (1918). NO PRODUCTION RECORDED. NO SHIPPING ORE COULD BE RECOVERED BY HAND SORTING. THE RELATIONS OF THIS BODY TO THE ADJACENT ROCKS ARE UNCERTAIN, BUT IT APPEARS TO BE OVERLAIN TO THE SOUTH BY GREENSTONE

Comments on the workings information

  • SMALL OPEN CUT

Reference information

Bibliographic references

  • Deposit

    CALIF. JOUR. MINES & GEOL. V. 46, NO.2, APRIL 1950, P.344, PL. 58

  • Deposit

    DOM BULL. 125, P.99

  • Deposit

    BULL. 152, P.21

  • Deposit

    BULL. 140 , PL. 1 (GEOLOGY)

Reporter information

Type Date Name Affiliation Comment
Reporter 01-JUN-1972 Gere, W. U.S. Geological Survey
Updater 01-APR-1977 Von Dohlen, E.; 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.