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Spread Eagle Group

Past Producer in Mariposa county in California, United States with commodities Gold, Copper, Lead, 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. 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. Production statistics
  16. Workings at the site
  17. Links to other databases
  18. Bibliographic references
  19. General comments
  20. Reporter information

Geologic information

Identification information

Deposit ID 10102897
MRDS ID M009736
Record type Site
Current site name Spread Eagle Group
Alternate or previous names Empire Farmers Hope, Miners Hope, Mohawk, Monarch, Tollgate, Bonanza Ii
Related records 10212494

Geographic coordinates

Geographic coordinates: -120.01598, 37.55021 (WGS84)
Elevation 878
Relative position 4 MI N MARIPOSA

Site location context

Political divisions (FIPS codes)

Mariposa(county)

California(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Bear Valley(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)

Geographic areas

Country State County
United States California Mariposa

Public Land Survey System information

Meridian Township Range Section Fraction State
Mount Diablo 004S 018E 29,31,32 California

Commodities

Commodity Importance
Gold Primary
Copper Secondary
Lead Secondary
Silver Secondary

Materials information

Materials Type of material
Chalcopyrite Ore
Galena Ore
Gold Ore
Pyrite Ore
Quartz Gangue

Analytical data

Result ASSAYS FROM $4.86 - $8.24 AU/TON SULFIDE CONCENTRATES AVG $250/TON.

Host and associated rocks

  • Host or associated Host
    Rock type Metamorphic Rock > Metasedimentary Rock > Slate
  • Host or associated Host
    Rock type Metamorphic Rock > Metavolcanic Rock > Mafic Metamorphic Rock > Greenstone

Nearby scientific data

(1) -120.01598, 37.55021
ListMap

Economic information

Ore body information

  • Strike NW
    Dip 40 NE
    Thickness 1.83M
    Depth to top 0M

Controls for ore emplacement

  • Ore Shoots Associated W/Small Fissures.

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic
Deposit size Small
Significant No
Discovery year 1855

Mining district

District name Whitlock

Ownership information

  • Type Operator
    Owner Mack C. Lake
    Home office C/O Carlo Morbio

Production statistics

  • Year 1955
    Period 1893 - 1955
    Material AU,AG
    Accuracy Accurate
    Description Cp_Grade: ^0.5 - 0.26 Oz Au/Ton
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Gold Gold 11g/mt

Comments on the production information

  • SUBSTANTIAL PRODUCTION 1934 - 1939 FROM ORE LESS 0.25 OZ AU/TON. VEIN CONTAINS POCKETS OF HIGH GRADE 1 OZ/TON ORE WITH 2 - 3 OZ/TON NOT EXCEPTIONAL. EMPIRE CLAIM, S OF MINERS HOPE IS SMALL VEIN CALLED DOLPH PRODUCED $25,000 . PRODUCTION TO 1940 ABOUT $425,000 . REPORTED PRODUCTION $100,200 . 2500 TONS ORE RECOVERED FROM ONE SHOOT MINERS HOPE MINE ASSAYED $9.70/TON, YIELDED $7.20/TON BY AMALGAMATION.

Workings at the site

  • Type of workings Surface/Underground
    Length 365.76M
    Overall depth 93.88M

Comments on the workings information

  • SHAFT W/2 LEVELS, 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. 307

  • Deposit

    CASTELLO, W. O., 1921 , MINES AND MINERAL RESOURCES OF MARIPOSA COUNTY IN SEVENTEENTH REPORT OF THE STATE GEOLOGIST: CALIFORNIA STATE MINING BUREAU, P 139

  • Deposit

    LAIZURE, C. MCK., 1928 , SAN FRANCISCO FIELD DIVISION, IN TWENTY-FOURTH REPORT OF THE STATE MINERALOGIST: CALIFORNIA STATE MINING BUREAU, P. 117

  • Production

    BOWEN & GRAY 1957 .

General comments

Subject category Comment text
Deposit VEINS SEVERAL, 2 - 6 FT THICK VEINS ON SLATE CONTACT DIP EAST, THOSE IN GREENSTONE DIP NEARLY 90 .
Deposit Discovery Year: 1850'S

Reporter information

Type Date Name Affiliation Comment
Reporter 01-FEB-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.