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Big Sandy

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. Ore body information
  11. Economic information about the deposit and operations
  12. Workings at the site
  13. Links to other databases
  14. Bibliographic references
  15. General comments
  16. Reporter information

Geologic information

Identification information

Deposit ID 10101105
MRDS ID C007859
Record type Site
Current site name Big Sandy
Alternate or previous names James Marshall
Related records 10211626

Geographic coordinates

Geographic coordinates: -120.82102, 38.78879 (WGS84)
Elevation 607
Relative position 1/2 MI S OF KELSEY

Site location context

Political divisions (FIPS codes)

El Dorado(county)

California(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Garden Valley(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 011N 010E 24 California

Comments on the location information

  • UTM ACC SE 1/4 OF NW 1/4 SEC

Commodities

Commodity Importance
Gold Primary

Comments on the commodity information

  • CRYSTALLINE GOLD FOUND

Materials information

Materials Type of material
Ankerite Gangue

Host and associated rocks

  • Host or associated Host
    Rock type Metamorphic Rock > Metasedimentary Rock > Slate

Nearby scientific data

(1) -120.82102, 38.78879
ListMap

Economic information

Ore body information

  • Strike N 12 W
    Dip 70 E
    Thickness 4.57M
    Depth to top 0M

Comments on the geologic information

  • CRYSTALLINE GOLD IN POCKETS, DEPOSIT IN MARIPOSA SLATE, ON THE SURFACE NEAR SHAFT, THE FOOTWALL ROCK IS AN AMPHIBOLITE SCHIST DIKE, AND THE SECTION ACROSS THE CLAIM SHOWS IN ORDER GOING EAST, BANDS OF PORPHYRY (ALTERED, OBSCURE) SOAPSTONE AND ANKERITE, TALCOSE SCHIST, VEIN MATTER 15 FT. WIDE COMPOSED OF STRINGER LEADS OF QUARTZ AND CARBONATES IN ALTERED SCHIST, AND MARIPOSA SLATE 50 FT. WIDE.

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 1890S, 1930S

Workings at the site

  • Type of workings Surface/Underground
    Area 4.181HA
    Overall depth 103.63M
    Overall length 228.6M
    Overall width 4.57M

Comments on the workings information

  • DEVELOPED BY OPEN CUT AND 340 FT SHAFT WITH LEVELS AT 60 , 120 , 227 , AND 323 . VEIN INTERSECTED BY SHAFT AT 240 FT, NUMEROUS 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. 408 - 9 , 488 AND PL 10 .

  • Deposit

    LOGAN, C. A., 1935 , MOTHER LODE GOLD BELT OF CALIF.: CALIF. DIV. MINES BULL. 108 , PG. 19 - 20 .

  • Deposit

    TUCKER, W. B., 1919 , EL DORADO COUNTY: CALIF. MIN. BUR. REPT., 15TH REPT. STATE MIN., P. 281 .

  • Production

    LOGAN ( 1935 )

General comments

Subject category Comment text
Deposit VEIN AND POCKETS

Reporter information

Type Date Name Affiliation Comment
Reporter 01-MAY-1979 Mateik, R.; Albers, John P. 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.