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  3. Mineral Resource Data System (MRDS)

Crosby Prospects

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. Host and associated rocks
  8. Nearby scientific data
  9. Ore body information
  10. Economic information about the deposit and operations
  11. Ownership information
  12. Links to other databases
  13. Bibliographic references
  14. Reporter information

Geologic information

Identification information

Deposit ID 10027976
MRDS ID M004676
Record type Site
Current site name Crosby Prospects
Related records 10138097

Geographic coordinates

Geographic coordinates: -121.69159, 37.55158 (WGS84)
Elevation 305
Relative position ON W. SLOPE OF ARROYO DEL VALLE ON E. SIDE OF ROCKY RIDGE, 12 MI. FROM LIVERMORE, UTM APPROX, ALTITUDE LISTED DOESN'T CORRESPOND WITH LOCATION GIVEN

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 003E 30 California

Comments on the location information

  • LOCATED IN SE 1/4 SW 1/4 SECTION 30

Commodities

Commodity Importance
Manganese Critical Tertiary

Host and associated rocks

  • Host or associated Host
    Rock type Sedimentary Rock > Chemical Sediment > Chert
    Stratigraphic age (youngest) Late Cretaceous

Nearby scientific data

(1) -121.69159, 37.55158
ListMap

Economic information

Ore body information

  • Strike N 30 - 60 E
    Dip 30 S, 40 NW

Comments on the geologic information

  • GEOL.DESC: AT THE NORTHERN AND BETTER OF THE TWO PROSPECTS A LARGE BLOCK CONTAINING ABOUT 50 TONS OF SILICEOUS ORE IS EXPOSED ON THE SURFACE. IT IS UNDERLAIN BY WELL BEDDED CHERTS AND SHALES, STRIKING N 60 E, DIP 30 S. THE OTHER PROSPECT IS 500 FT. SOUTHWEST WHERE A TRENCH EXPOSES A 3 FT. BED OF MASSIVE CHERT CUT BY A FEW VEINLETS OF MANGANESE OXIDE.

Economic information about the deposit and operations

Development status Occurrence
Commodity type Metallic
Significant No

Ownership information

  • Type Owner
    Owner Mary Gerow
    First year 1950

Comments on the production information

  • NO PRODUCTION

Comments on the workings information

  • TRENCHING

Reference information

Bibliographic references

  • Deposit

    CALIF. JOUR. MINES & GEOL. V. 46, NO.2, APRIL 1950, P 343, PL. 58

  • Deposit

    DOM BULL. 125, P.98

  • Deposit

    BULL. 152, P.19

  • 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.