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Eureka

Past Producer in Amador 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. Economic information about the deposit and operations
  11. Land status
  12. Ownership information
  13. Links to other databases
  14. Bibliographic references
  15. General comments
  16. Reporter information

Geologic information

Identification information

Deposit ID 10028224
MRDS ID M005090
Record type Site
Current site name Eureka
Alternate or previous names Old Eureka, Amador Consolidated, Hetty Green, Hayward.
Related records 10138777

Geographic coordinates

Geographic coordinates: -120.79991, 38.38796 (WGS84)
Relative position E 1/2 E 1/2 SEC. 7, W 1/2 W 1/2 SEC. 8

Site location context

Political divisions (FIPS codes)

Amador(county)

California(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Amador City(quadrangle 1:24,000 scale)

San Andreas(quadrangle 1:100,000 scale)

Sacramento(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Upper Mokelumne(hydrologic unit)

San Joaquin(hydrologic accounting unit)

San Joaquin(hydrologic subregion)

California(hydrologic region)

Geographic areas

Country State County
United States California Amador

Public Land Survey System information

Meridian Township Range Section Fraction State
Mount Diablo 006N 011E 07,08 California

Commodities

Commodity Importance
Gold Primary

Materials information

Materials Type of material
Gold Ore

Host and associated rocks

  • Host or associated Host
    Rock type Metamorphic Rock > Metasedimentary Rock > Slate
  • Host or associated Host
    Rock type Volcanic Rock (Aphanitic) > Intermediate Volcanic Rock > Andesite

Nearby scientific data

(1) -120.79991, 38.38796
ListMap

Economic information

Comments on the geologic information

  • GEOL.DESC: MAIN VEIN HAD SLATE FOOTWALL, HEAVY GOUGE, AND META-ARDESITE HANGING WALL.

Economic information about the deposit and operations

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

Land status

Ownership category Private

Ownership information

  • Type Operator
    Owner Central Eureka Mining Co.

Comments on the production information

  • TOTAL PRODUCTION FIGURES NOT AVAILABLE BUT 12 TO 13 MILLION DOLLARS IS A FAIR ESTIMATE JUDGING FROM KNOWN OUTPUT FOR SEVERAL YEARS. RICHEST PART WAS 1000 FT DOWN FROM SURFACE WHERE ORE AVERAGED $27 A TON. FIVE HUNDRED FOOT ORE SHOOT BOTTOMED BETWEEN 1700 AND 1800 FT WITH ORE VARYING GREATLY. AVERAGE GRADE ASSAYED ABOUT $35 A TON.

Comments on the workings information

  • TWO VEINS CALLED 'BOULDER LEDGE' AND 'TRUE LEDGE' WERE WORKED. THE 'BOULDER LEDGE' WAS ON WEST, 15 TO 20 FT THICK YIELDING $10 A TON, HAVING BEST GRADE BETWEEN 800 AND 1350 FT LEVELS. 'TRUE LEDGE' VARIED FROM 3 TO 15 FT IN THICKNESS IN THE MIDDLE LEVELS, AND WAS MUCH HIGHER GRADE.

Reference information

Bibliographic references

  • Deposit

    LOGAN, C.A., 1927 , SACRAMENTO FIELD DIV., AMADOR COUNTY: CMB REPT 23 , P. 178

  • Deposit

    USGS FOLIO 63, P. 8, CLAIM SHEET 1, SEC. 1

  • Deposit

    DOM BULL.108, P.75, PL.3

  • Production

    LOGAN, C.A., 1927

General comments

Subject category Comment text
Deposit THIS CLAIM ADJOINS THE CENTRAL EUREKA MINE. OWNERS OF THE CENTRAL EUREKA PURCHASED THIS PROPERTY AROUND 1926 , AND CONNECTED THE TWO WORKINGS BY AN UPPER ADIT. OLD EUREKA DISCOVERED 1852 , SUCCESSFULLY OPERATING UNTIL 1881 . THE DEPTH OF THE MINE WAS THEN 1965 FT.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-JUN-1972 Gere, W. U.S. Geological Survey
Updater 01-APR-1978 Tatkin, T.; 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.