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Camp 9 Merchant, Cummings

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

Geologic information

Identification information

Deposit ID 10109078
MRDS ID M004659
Record type Site
Current site name Camp 9 Merchant, Cummings
Related records 10162994

Geographic coordinates

Geographic coordinates: -121.65131, 37.6013 (WGS84)
Elevation 457

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 09 California

Comments on the location information

  • LOCATED IN NE 1/4 SECTION 9

Commodities

Commodity Importance
Manganese Critical Primary

Materials information

Materials Type of material
Rhodochrosite Ore

Host and associated rocks

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

Nearby scientific data

(1) -121.65131, 37.6013
ListMap

Economic information

Ore body information

  • Strike N 35 TO 75 W
    Dip 35 TO 50 S
    Thickness 1.52M

Comments on the geologic information

  • ORE HOSTED IN FRANCISCAN COMPLEX - L. TO L. ; GEOL.DESC: SINGLE MASSIVE BED; LOWER PART OF ZONE. INVARIABLY A MASSIVE CHERT GRADING TO AN UPPER ZONE OF CARBONATE ORE WHICH OCCURS IN LENSES AND KIDNEYS. UPPER CONTACT OF ORE ZONE IS VERY CONTINUOUS AND IS STRONGLY STAINED BY MANGANESE OXIDES. ORE ZONE LIES WITHIN A BODY OF BEDDED RADIOLARIN CHERT AND SHALE AND LIES ESSENTIALLY PARALLEL TO THEM.

Economic information about the deposit and operations

Development status Producer
Commodity type Metallic
Deposit size Large
Significant No
Discovery year 1888

Ownership information

  • Type Operator
    Owner Frank Cummings
    First year 1917
    Last year 1918
  • Type Owner
    Owner M. K. Devany And John Kelly
    First year 1950

Comments on the production information

  • PRODUCTION MORE THAN 1,000 TONS. MINE SITUATED ON WEST BANK OF A SMALL STEEP GULCH WHICH TRENDS SOUTHWEST TO THE ARROYO MOCHO. WAS UNCOVERED DURING CONSTRUCTION OF THE ARROYO MOCHO ROAD. FURTHER PROSPECTING IS WARRANTED AT SEVERAL POINTS. VEINLETS OF BLUE AMPHIBOLE WERE FOUND IN THE MASSIVE CHERT AT SEVERAL PLACES IN THE LOWER WORKINGS

Comments on the workings information

  • TWO TUNNELS, ONE BELOW THE ARROYO MOCHO ROAD, THE OTHER ABOVE. WORKINGS ARE, IN PLACES, CONNECTED BY STOPES ALONG THE ORE ZONE.

Reference information

Bibliographic references

  • Deposit

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

  • Deposit

    DOM BULL. 125, P.96

  • Deposit

    BULL. 152, P.17-18

General comments

Subject category Comment text
Deposit ADD. REF. NO.4. BULL. 140, PL. 1 (GEOLOGY); NO.5. DOM BULL. 176, 1957, P.326, 329; NO.6. USBM RI 5579, P.21

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.