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Juniper

Past Producer in Mariposa county in California, United States with commodities Gold, Silver
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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. Production statistics
  13. Workings at the site
  14. Links to other databases
  15. Bibliographic references
  16. General comments
  17. Reporter information

Geologic information

Identification information

Deposit ID 10031021
MRDS ID M009572
Record type Site
Current site name Juniper
Alternate or previous names Juniper & Patricia, Patricia & Charles

Geographic coordinates

Geographic coordinates: -120.15043, 37.55881 (WGS84)
Elevation 808
Relative position ON TOP OF BEAR VALLEY MTN

Site location context

Political divisions (FIPS codes)

Mariposa(county)

California(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Hornitos(quadrangle 1:24,000 scale)

Oakdale(quadrangle 1:100,000 scale)

San Jose(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Fresno River(hydrologic unit)

San Joaquin(hydrologic accounting unit)

San Joaquin(hydrologic subregion)

California(hydrologic region)

Federal lands

Bureau of Land Management(Bureau of Land Management CA)

Bureau of Land Management CA BLM(Type of land area)

BLM(Federal land areas administered by BLM)

Geographic areas

Country State County
United States California Mariposa

Public Land Survey System information

Meridian Township Range Section Fraction State
Mount Diablo 004S 017E 19,30 California

Comments on the location information

  • UTM ACC, SW 1/4 19 , NW 1/4 30 .

Commodities

Commodity Importance
Gold Primary
Silver Secondary

Host and associated rocks

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

Nearby scientific data

(1) -120.15043, 37.55881
ListMap

Economic information

Ore body information

  • Strike NW
    Dip NE 45 - 60
    Thickness 1.52M
    Depth to top 0M

Comments on the geologic information

  • GEOL.DESC: MASSIVE AND SCHISTOSE GREENSTONE DERIVED FROM PYROXENE ANDESITE.

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic
Deposit size Small
Significant No
Discovery year 1855
Production years 1919 - 1940

Ownership information

  • Type Operator
    Owner Pereno C. Zirker, Et Al.

Production statistics

  • Year 1940
    Period - 1940
    Material ORE AUG
    Description Cp_Grade: ^1.04 Oz Au/Ton
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Ore Gold Gold 312g/mt

Comments on the production information

  • RANGE OF ORE GRADE FROM 14.4 OZ AU, 4 OZ AG PER TON TO 0.35 OZ AU/TON. ACTIVE 1882 . LAST OPERATION 1933 - 1937 . PRODUCTION RECORDS ARE INCOMPLETE.

Workings at the site

  • Type of workings Surface/Underground
    Length 243.84M
    Overall depth 39.62M

Comments on the workings information

  • ON JUNIPER, 500-FT. ADIT, STOPES, TOTALING 800 FT. OF WORKINGS; ON STARLIGHT, OR PATRICIA, 320-FT. VERTICAL SHAFT WITH SEVERAL HUNDRED FEET OF DRIFTS.

Reference information

Bibliographic references

  • Deposit

    BOWEN, O. E., JR., GRAY, C. H., JR., 1957 , MINES AND MINERAL DEPOSITS OF MARIPOSA COUNTY, CALIFORNIA: CALIF. JOUR. MINES AND GEOLOGY, V. 53 , NOS. 1 AND 2 , P. 115 - 116 , 272 .

  • Deposit

    LAIZURE, C. MCK., 1928 , SAN FRANCISCO FIELD DIVISION IN TWENTY-FOURTH REPORT OF THE STATE MINERALOGIST: CALIFORNIA STATE MINING BUREAU. P. 126 .

  • Production

    BOWEN & GRAY 1957

General comments

Subject category Comment text
Deposit VEINS, TWO SETS 1 - 5 FT THICK. SOME VEIN OFFSHOOTS STRIKE NE WITH STEEPER DIP THAN MAIN VEINS.
Deposit A PATENTED CLAIM OF 20 ACRES AND SEVERAL UNPATENTED CLAIMS. ORIGINALLY INCLUDED THE JUNIPER, INDEPENDENCE, STARLIGHT (PATRICIA) AND MT. VIEW LODE CLAIMS AND THE INDEPENDENCIO PLACER CLAIM. (ONE OF THE CLAIMS APPARENTLY WAS RENAMED THE CHARLES.)
Deposit Discovery Year: 1850'S

Reporter information

Type Date Name Affiliation Comment
Reporter 01-JUN-1973 Gere, W. U.S. Geological Survey
Updater 01-JAN-1979 Bowman, J. And Albers, J. U.S. Geological Survey

Beyond USGS

Supplemental information added by qvyshift.com. Not part of the original USGS MRDS record.

External references

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.