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Cobb Mountain Oyster Rock

Occurrence in Lake 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. Economic information about the deposit and operations
  10. Links to other databases
  11. Bibliographic references
  12. Reporter information

Geologic information

Identification information

Deposit ID 10030665
MRDS ID M008978
Record type Site
Current site name Cobb Mountain Oyster Rock
Related records 10261080

Geographic coordinates

Geographic coordinates: -122.74551, 38.7971 (WGS84)
Relative position W. SIDE OF COBB MOUNTAIN, NEAR THE LAKE COUNTY LINE, 250 FT. S.W. OF THE GEYSER ROCK, 30 MI. FROM CALISTOGA.

Site location context

Political divisions (FIPS codes)

Lake(county)

California(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Whispering Pines(quadrangle 1:24,000 scale)

Healdsburg(quadrangle 1:100,000 scale)

Santa Rosa(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Russian(hydrologic unit)

Northern California Coastal(hydrologic accounting unit)

Klamath-Northern California Coastal(hydrologic subregion)

California(hydrologic region)

Geographic areas

Country State County
United States California Lake

Public Land Survey System information

Meridian Township Range Section Fraction State
Mount Diablo 011N 008W 21 California

Comments on the location information

  • LOCATION APPROXIMATE, UTM APPROX.

Commodities

Commodity Importance
Manganese Critical Tertiary

Host and associated rocks

  • Host or associated Host
    Rock type Metamorphic Rock > Metavolcanic Rock > Mafic Metamorphic Rock > Greenstone
    Stratigraphic age (youngest) Late Cretaceous

Nearby scientific data

(1) -122.74551, 38.7971
ListMap

Economic information

Comments on the geologic information

  • GEOL.DESC: MASS OF GREENSTONE CONTAINS INCLUSIONS OF JASPER THAT HAVE BEEN METAMORPHOSED BY HEAT FROM THE INTRUSION. FRACTURES AND CRACKS IN THE GREENSTONE AND JASPER ARE STAINED BLACK WITH MANGANESE OXIDE, WHILE FRESH BREAKS ARE FREE FROM THE OXIDE.

Economic information about the deposit and operations

Development status Occurrence
Commodity type Metallic
Significant No

Reference information

Bibliographic references

  • Deposit

    D.O.M. BULL. 152 1950 P. 89

  • Deposit

    D.O.M. BULL. 125 1943 P. 79

Reporter information

Type Date Name Affiliation Comment
Reporter 01-JUN-1973 Gere, W. U.S. Geological Survey
Updater 01-DEC-1977 Killman, K.; 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.