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Bunker Hill

Past Producer in Amador county in California, United States with commodities Gold, Iron
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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. Alteration
  9. Host and associated rocks
  10. Nearby scientific data
  11. Ore body information
  12. Economic information about the deposit and operations
  13. Land status
  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 10102591
MRDS ID M004928
Record type Site
Current site name Bunker Hill
Alternate or previous names Rancheria, South Mayflaver, Nevada.
Related records 10235431

Geographic coordinates

Geographic coordinates: -120.82463, 38.4249 (WGS84)
Relative position ABOUT 1/4 MILE N. OF AMADOR CITY

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 007 010E 25,36 California

Commodities

Commodity Importance
Gold Primary
Iron Tertiary

Materials information

Materials Type of material
Gold Ore
Pyrite Ore
Quartz Gangue

Alteration

  • (Local) Greenstone-Quartz Ore Formed By Hydrothermal Alteration Of Greenstone.

Analytical data

Result ORE IN QUARTZ - GREENSTONE VEINS ASSOCIATED UP TO 4 % PYRITE.

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) -120.82463, 38.4249
ListMap

Economic information

Ore body information

  • General form PINCH AND SWELL
    Strike NW
    Dip NE
    Thickness 1.83M
    Width 243.84M

Comments on the geologic information

  • GREENSTONE IS META-ANDESITE. ; GEOL.DESC: QUARTZ, GREENSTONE VEIN AVERAGING 5 1/2 FT. IN THICKNESS; SOME BLACK SLATE HEAVILY CHARGED WITH PYRITE AND SOME ARSENOPYRITE; SLATE FOOTWALL, META-ANDESITE HANGING WALL; VEINS IN BOTH HANGING AND FOOTWALLS; IN PLACES SLATE AND GREENSTONE INTERBEDDED AND GREENSTONE ALTERED TO SCHIST; ORE OCCURS IN CRUSHED SLATE GOUGE VEINS, QUARTZ STRINGERS AND LARGE BODIES OF QUARTZ.

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic
Deposit size Medium
Significant No
Discovery year 1853

Land status

Ownership category Private

Ownership information

  • Type Operator
    Owner Bunker Hill Mining Co.
    Home office C/O D. C. Crandall

Comments on the production information

  • FIRST WORKED IN 1853; DURING 1860'S AND 1870'S ORE YIELDING FROM $50 TO $75 PER TON PRODUCED. BUNKER HILL CONS. MNG. CO. ORGANIZED IN 1899 OPERATED STEADILY UNTIL 1922, PRODUCING 887,585 TONS OF ORE WHICH YIELDED $3,834,550. IDLE SINCE 1922 EXCEPT FOR A SMALL AMOUNT OF WORK IN 1925. TOTAL OF $5,154,382 IN GOLD PRODUCED. PRINCIPAL VEIN IS THE BUNKER HILL, OR HANGING WALL VEIN; OTHERS INCLUDING THE GOUGE VEIN AND THE LAST CHANCE LIE IN THE FOOTWALL. MAY BE THE SHAFT SHOWN IN THE SW 1/4 SE 1/4 SEC. 25 ON USGS QUAD. SUTTER CREEK, CALIF. 1957

Workings at the site

  • Type of workings Underground
    Area 30.757HA
    Overall depth 1036.32M

Comments on the workings information

  • SHAFT 2800 FT., WINZE TO 3400 FT LEVEL, MAJOR STOPING ABOVE 2400 FT LEVEL; ORE MINED BY SQUARE-SET STOPE AND LATER SHRINKAGE STOPING.

Reference information

Bibliographic references

  • Deposit

    CARLSON, D.W. AND CLARK, W.B., 1954 , MINES AND MIN. RES. OF AMADOR COUNTY, CAL.: CJMG VOL. 50 , P. 173

  • Deposit

    LOGAN, C.A., 1934 , MOTHER LODE GOLD BELT OF CAL.: CDM BULL 108 , P. 72 - 74

  • Deposit

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

  • Production

    LOGAN, C.A., 1934

General comments

Subject category Comment text
Deposit ADD. REF. NO. 4. INCLUDES THE BUNKER HILL, MAYFLOWER, AND NEVADA CLAIMS, 76 ACRES

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.