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Joseph Skinner

Past Producer in El Dorado 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. Geologic structures
  11. Ore body information
  12. Controls for ore emplacement
  13. Economic information about the deposit and operations
  14. Links to other databases
  15. Bibliographic references
  16. General comments
  17. Reporter information

Geologic information

Identification information

Deposit ID 10101129
MRDS ID C008126
Record type Site
Current site name Joseph Skinner
Alternate or previous names Fisk, Porphyry
Related records 10211434

Geographic coordinates

Geographic coordinates: -120.80241, 38.73879 (WGS84)
Relative position 1 MI. N OF PLACERVILLE ON QUARTZ HILL.

Site location context

Political divisions (FIPS codes)

El Dorado(county)

California(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Placerville(quadrangle 1:24,000 scale)

Placerville(quadrangle 1:100,000 scale)

Sacramento(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

South Fork American(hydrologic unit)

Lower Sacramento(hydrologic accounting unit)

Sacramento(hydrologic subregion)

California(hydrologic region)

Geographic areas

Country State County
United States California El Dorado

Public Land Survey System information

Meridian Township Range Section Fraction State
Mount Diablo 010N 011E 07 California

Commodities

Commodity Importance
Gold Primary

Comments on the commodity information

  • ORE IN THIN QUARTZ SEAMS AND POCKETS SOME ORE PRODUCED ORE OF $100 TO THE PAN WITH 25 TO 40 OZ. PIECES.

Materials information

Materials Type of material
Gold Ore
Quartz Gangue

Host and associated rocks

  • Host or associated Host
    Rock type Metamorphic Rock > Metasedimentary Rock > Slate
    Rock unit name Mariposa Formation;
    Rock description Mariposa Formation;

Economic information

Geologic structures

Type of structure Local
Structure description Regional Dip Is Nearly Verticle Or Steeply W

Ore body information

  • Strike N
    Dip W-E
    Depth to top 0M

Controls for ore emplacement

  • Au In Qtz. Seam In Dike Where Qtz. Comes In Contact With Lower (E) Side Of Slate

Comments on the geologic information

  • SEAM DEPOSIT IN DIKE ROCK AND MARIPOSA SLATE.

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic
Deposit size Small
Significant No

Comments on the production information

  • ACTIVE 1896 - 98 , 1901 - 03 AND AROUND 1932 .

Comments on the workings information

  • ORIGINALLY WORKED BY HYDRAWLICKING THEN BY 232 FT. ADIT AND DRIFTS NUMEROUS OTHER ADITS AND DRIFTS.

Reference information

Bibliographic references

  • Deposit

    CLARK, W. B., AND CARLSON, D. W., 1956 , MINES AND MINERAL RESOURCES OF EL DORADO CO., CALIF.: CALIF. JOUR. OF MINES AND GEOL., VOL. 52 , NO. 4 , PG. 571 .

  • Deposit

    CRAWFORD, J. J., 1896 , EL DORADO COUNTY; CALIF. MIN. BUR. 13TH REPT. STATE MINERALOGIST, P. 140 .

  • Deposit

    LOGAN, C. A., 1935 , MOTHER LODE GOLD BELT OF CALIF.: CALIF. DIV. OF MINES BULL. 108 , PG. 28 , 45 .

  • Deposit

    LOGAN, C. A., 1938 , MIN. RESOURCES OF EL DORADO CO.: CALIF. JOUR. OF MINES AND GEOL., VOL. 34 , NO. 3 , PG. 263 .

  • Production

    CLARK ( 1956 ), LOGAN ( 1935 )

General comments

Subject category Comment text
Deposit VEIN, SEAM DEPOSIT, POCKETS. THE VEIN STRIKES N. AND S., DIPS W., TURNING OVER LATER TO THE E., BETWEEN SERPENTINE ON THE WEST AND BLACK GRAPHITIC SLATE ON THE EAST. ABOUT 70 FEET E. OF THE VEIN IS A BELT, 100 FEET WIDE, OF SILICIOUS SLATE AND PORPHYRY, CARRYING TWO SEAMS OF QUARTZ, ON ONE OF WHICH POCKETS OF GOLD ARE ENCOUNTERED.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-FEB-1979 Mateik, R.; Albers, John P. U.S. Geological Survey PARSED HOST ROCK AND ASSOCIATED ROCK INFORMATION FROM OLD SINGLE VALUED FIELD TO NEW MULTIVALUED FIELD
Editor 27-APR-1995 Mosier, Dan 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.