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  3. Mineral Resource Data System (MRDS)

Red Rock

Producer in Contra Costa 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. Materials information
  8. Host and associated rocks
  9. Nearby scientific data
  10. Ore body information
  11. Economic information about the deposit and operations
  12. Links to other databases
  13. Bibliographic references
  14. General comments
  15. Reporter information

Geologic information

Identification information

Deposit ID 10029596
MRDS ID M007243
Record type Site
Current site name Red Rock

Geographic coordinates

Geographic coordinates: -122.43077, 37.92879 (WGS84)
Elevation 37
Relative position SW SIDE OF RED ROCK ISLAND IN SAN FRANCISCO BAY, 1 MI S.W. OF POINT CASTRO.

Site location context

Political divisions (FIPS codes)

Contra Costa(county)

California(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

San Quentin(quadrangle 1:24,000 scale)

San Francisco(quadrangle 1:100,000 scale)

San Francisco(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

San Pablo 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 Contra Costa

Public Land Survey System information

Meridian Township Range Section Fraction State
Mount Diablo 001N 005W 17 California

Commodities

Commodity Importance
Manganese Critical Primary

Materials information

Materials Type of material
Mineral Paint Ore
Psilomelane Ore

Host and associated rocks

  • Host or associated Host
    Rock type Sedimentary Rock > Clastic Sedimentary Rock > Shale
    Stratigraphic age (youngest) Late Cretaceous
    Stratigraphic age (youngest) Late Cretaceous
  • Host or associated Host
    Rock type Sedimentary Rock > Chemical Sediment > Chert
    Rock unit name Franciscan Complex
    Rock description Franciscan Complex

Nearby scientific data

(1) -122.43077, 37.92879
ListMap

Economic information

Ore body information

  • Strike W - NW
    Dip VERTICAL
    Thickness 0.01M

Comments on the geologic information

  • ORE HOSTED IN FRANCISCAN COMPLEX - L. TO L. ; GEOL.DESC: INTERSHATIFIED LAYERS OF PSILOMELANE (MOSTLY 1/4 TO 1/2 INCH THICK) IN RADIOLARIN CHERT OF FRANCISCAN COMPLEX. SHALE PARTINGS ARE LOCALLY REPLACED BY PSILOMELANE. ORE APPEARS TO BE PRIMARY, CONTEMPORANEOUS WITH DEPOSITION OF SILICA THAT FORMED THE CHERTS.

Economic information about the deposit and operations

Development status Producer
Commodity type Metallic
Deposit size Medium
Significant No

Comments on the production information

  • PRODUCTION IN 1867 OF POSSIBLE 200 TONS OF ORE FROM THIS DEPOSIT HAS BEEN REPORTED.

Reference information

Bibliographic references

  • Deposit

    CALIF. JOUR. VOL. 47, NO. 4, OCT. 1951, P. 575; V. 54, NO. 4, OCT. 1958, P.529, 573.

  • Deposit

    D.O.M. BULL. 152 1950 P. 50

General comments

Subject category Comment text
Deposit ASSOCIATED RED CHERT ONCE MINED AS MINERAL PAINT

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.