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Original Amador

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. Alteration
  9. Host and associated rocks
  10. Nearby scientific data
  11. Geologic structures
  12. Ore body information
  13. Economic information about the deposit and operations
  14. Land status
  15. Ownership information
  16. Links to other databases
  17. Bibliographic references
  18. General comments
  19. Reporter information

Geologic information

Identification information

Deposit ID 10028119
MRDS ID M004938
Record type Site
Current site name Original Amador
Alternate or previous names Eclipse, Little Amador
Related records 10260274

Geographic coordinates

Geographic coordinates: -120.82713, 38.42296 (WGS84)
Relative position IN AMADOR CITY, ON N SIDE OF AMADOR CREEK. BETWEEN BUNKER HILL ON N AND KEYSTONE ON S.

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 36 California

Commodities

Commodity Importance
Gold Primary

Materials information

Materials Type of material
Gold Ore

Alteration

  • (Local) In Places On The Vein, The Quartz Commonly Sploched With Aggregates Of Muscovite Formed By Hydrothermal Alteration Of Inclosed Filaments Of Schistose Greenstone.

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) -120.82713, 38.42296
ListMap

Economic information

Geologic structures

Type of structure Local
Structure description Reverse Faulting Along Vein Fissure Is Probably More Clearly And Accurately Measurable In The Original Amador Than Any Other Mine On The Mother Lode, It Amounts To 180 Ft.

Ore body information

  • General form PINCH AND SWELL
    Thickness 15.24M

Comments on the geologic information

  • GEOL.DESC: BLACK SLATE IN UPPER LEVEL OF WORKINGS, PASSES INTO GREENSTONE AT DEPTH AS QUARTZ VEIN FLATTENS. CONTACT EXPOSED A SHORT DISTANCE WEST OF MAIN SHAFT COLLAR. AURIFEROUS GREENSTONE OCCURS ON HANGING WALL WHERE QUARTZ VEIN BRANCHES. CROSSCUT VEINS, RARE IN OTHER MOTHER LODE MINES ARE PARTICULARLY WELL EXPOSED AT 700 FT LEVEL, AND THEIR COURSES ARE IRREGULAR. THESE VEINS RANGE FROM 40 TO 90 FT AND CROSS STRATIGRAPHIC CONTACT WITHOUT ANY DISPLACEMENT.

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic
Deposit size Medium
Significant No
Discovery year 1852

Land status

Ownership category Private

Ownership information

  • Type Operator
    Owner J. W. Bullock
    Home office C/O C. E. Crandall

Comments on the production information

  • WORKED 1852-1874; PROSPECTED INTERMITTENTLY UNTIL 1898. BETWEEN 1898 AND 1918 OPERATED BY ORIG. AMADOR CONS. MINES CO. AND FROM 1910-1918 PRODUCED BETWEEN $90,000 AND $130,000 PER YEAR. IDLE UNTIL EARLY 1935 WHEN IT WAS REOPENED AND WORKED UNTIL MIDDLE OF 1937. THE TOTAL PRODUCTION IS ESTIMATED AT $3,500,000. ORE WAS OBTAINED FROM THE ORIGINAL AMADOR QUARTZ VEIN AND FROM LARGE IRREGULAR MASSES OF AURIFEROUS GREENSTONE. MINE IS A CONSOLIDATION OF SIX CLAIMS

Comments on the workings information

  • MINE OPENED BY INCLINED SHAFT 1,240 FT WITH 9,720 FT OF DRIFTS, 7,025 FT OF CROSSCUTS, AND 27,450 FT OF RAISES. SHAFT ON VEIN FROM SURFACE TO 300 FT LEVEL, WHERE VEIN PASSES INTO FOOTWALL.

Reference information

Bibliographic references

  • Deposit

    CARLSON, W.D., AND CLARK, W.B., 1954 , MINES AND MIN. RES. OF AMADOR COUNTY: CJMG VOL. 50 , P 188 .

  • Deposit

    KNOPF, ADOLPH, 1929 , THE MOTHER LODE SYSTEM OF CAL.: U.S.G.S. PROF. PAPER 157 , P. 56 - 59

  • Deposit

    TUCKER, W.B., 1914 , AMADOR COUNTY: CMB REPT. 14 , P. 39

General comments

Subject category Comment text
Deposit ORE SHOOTS IN QUARTZ VEINS LENTICULAR IN SHAPE.
Deposit ORIGINAL AMADOR MINE COMPRISES FOLLOWING CLAIMS: ORIGINAL AMADOR, EAST AMADOR, AMADOR WEDGE, GREAT EASTERN, ECLIPSE EXTENSION, AND LAST CHANCE.

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.

Maps centered on this site

Authoritative California resources

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