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Big Gulch

Producer in Amador county in California, United States with commodities Gold, Manganese
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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. Ownership information
  12. Links to other databases
  13. Bibliographic references
  14. General comments
  15. Reporter information

Geologic information

Identification information

Deposit ID 10028301
MRDS ID M005201
Record type Site
Current site name Big Gulch
Related records 10235590

Geographic coordinates

Geographic coordinates: -120.66462, 38.49101 (WGS84)
Relative position 5 1/2 MI BY ROAD E-SE OF FIDDLETOWN

Site location context

Political divisions (FIPS codes)

Amador(county)

California(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Pine Grove(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 007N 012E 04 California

Comments on the location information

  • LOCATED IN NW 1/4 SECTION 4 IN AN OLD HYDRAULIC GOLD PROPERTY.

Commodities

Commodity Importance
Gold Primary
Manganese Critical Tertiary

Materials information

Materials Type of material
Psilomelane Ore

Analytical data

Result MANGANESE ORE BELOW 10 PERCENT

Host and associated rocks

  • Host or associated Associated
    Rock type Volcanic Rock (Aphanitic) > Intermediate Volcanic Rock > Andesite
    Stratigraphic age (youngest) Pliocene
    Stratigraphic age (youngest) Pliocene
  • Host or associated Host
    Rock type Volcanic Rock (Aphanitic) > Intermediate Volcanic Rock > Andesite

Nearby scientific data

(1) -120.66462, 38.49101
ListMap

Economic information

Comments on the geologic information

  • GEOL.DESC: LOW-GRADE MANGANESE OXIDE (PSILOMELANE) IN LATERITIC SOILS BENEATH A LAVA CAP OF ANDESITIC BRECCIA. MANGANESE OXIDES CEMENT A REGOLITHIC BRECCIA WITH QUARTZ FRAGMENTS.

Economic information about the deposit and operations

Development status Producer
Commodity type Metallic
Significant No
Discovery year 1940

Ownership information

  • Type Operator
    Owner State Of California
    Home office California

Comments on the production information

  • THE MANGANIFEROUS MATERIAL IS MOSTLY BELOW 10 PERCENT MANGANESE ALTHOUGH A FEW INDIVIDUAL SPECIMENTS WERE SEEN WHICH MIGHT RUN 30 PERCENT MANGANESE. NO COMMERCIAL ORE SIGHT.

Comments on the workings information

  • FEW SMALL SHALLOW PITS AND ONE CUT 14 FT. LONG, 3 FT. WIDE, 10 FT. DEEP

Reference information

Bibliographic references

  • Deposit

    CALIF. JOUR. MINES & GEOL. V. 50, NO. 1, JAN. 1954, P. 268

  • Deposit

    DOM BULL. 152, P. 27

General comments

Subject category Comment text
Deposit LIMESTONE ALSO IN THIS SEC. (S 1/2)

Reporter information

Type Date Name Affiliation Comment
Reporter 01-JUN-1972 Gere, W. U.S. Geological Survey
Updater 01-APR-1977 Von Dohlen, E.; 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.