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Lafayette and Lafayette Ext.

Past Producer in Mariposa county in California, United States with commodity Gold
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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. Controls for ore emplacement
  12. Economic information about the deposit and operations
  13. Mining district
  14. Ownership information
  15. Workings at the site
  16. Links to other databases
  17. Bibliographic references
  18. General comments
  19. Reporter information

Geologic information

Identification information

Deposit ID 10030906
MRDS ID M009392
Record type Site
Current site name Lafayette and Lafayette Ext.

Geographic coordinates

Geographic coordinates: -120.18877, 37.59131 (WGS84)
Elevation 396
Relative position 3/4 MI N OF PYRAMID MINE

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)

Upper Merced(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 016E 15 California

Comments on the location information

  • UTM EST. NE 1/4

Commodities

Commodity Importance
Gold Primary

Materials information

Materials Type of material
Quartz Gangue

Host and associated rocks

  • Host or associated Host
    Rock type Volcanic Rock (Aphanitic) > Pyroclastic Rock > Tuff
    Stratigraphic age (youngest) Late Jurassic
  • Host or associated Host
    Rock type Volcanic Rock (Aphanitic) > Intermediate Volcanic Rock > Andesite

Nearby scientific data

(1) -120.18877, 37.59131
ListMap

Economic information

Ore body information

  • Strike N
    Dip E 40
    Thickness 0.91M
    Depth to top 0M

Controls for ore emplacement

  • Fissure

Comments on the geologic information

  • GEOL.DESC: ON BLUE LEAD, BOWEN AND GRAY ( 1957 ) STATE THE VEIN HAS DEVELOPED ALONG OR CLOSE TO THE CONTACT OF GREENSTONE OF LOGTOWN RIDGE MEMBER OF AMADOR GROUP AND HUNTER VALLEY CHERT MEMBER. LAIZURE ( 1928 ) DESCRIBES THE WALL ROCK AS PORPHYRITE.

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic
Deposit size Small
Significant No
Production years 1866 - 1867

Mining district

District name Hunter Valley

Ownership information

  • Type Operator
    Owner Louis And Gabriel Querioto (Ghirardelli)

Workings at the site

  • Type of workings Underground
    Length 67.06M
    Overall depth 45.72M

Comments on the workings information

  • INCLINED SHAFT 90 FT. DEEP AND A VERTICAL SHAFT 70 FT. DEEP. SHAFT SUNK TO WATER LEVEL, 150 FEET.

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. 116 , 275 .

  • Deposit

    LAIZURE, C. MCK., 1928 , SAN FRANCISCO FIELD DIVISION IN TWENTY-FOURTH REPORT OF THE STATE MINERALOGIST: CALIFORNIA STATE MINING BUREAU. P. 93 - 4 .

  • Deposit

    CASTELLO, W. O., 1921 , MINES AND MINERAL RESOURCES OF MARIPOSA COUNTY IN SEVENTEENTH REPORT OF THE STATE GEOLOGIST: CALIFORNIA STATE MINING BUREAU, P. 119 .

  • Production

    BOWEN & GRAY 1957

General comments

Subject category Comment text
Deposit VEIN, 1 - 3 FT THICK
Deposit TWO CLAIMS, PART OF A PARCEL OF PATENTED AGRICULTURAL LAND. THE VEIN IS NARROW BUT ORE SHOOTS HAVE BEEN CONSISTENTLY OF GOOD GRADE.

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.

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.