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Comet Mine

Past Producer in Sierra county in California, United States with commodities Gold, Copper
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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. Economic information about the deposit and operations
  12. Workings at the site
  13. Links to other databases
  14. Bibliographic references
  15. General comments
  16. Reporter information

Geologic information

Identification information

Deposit ID 10086572
MRDS ID X025540
Record type Site
Current site name Comet Mine
Alternate or previous names Republic Group Alhambra Group

Geographic coordinates

Geographic coordinates: -120.76992, 39.51488 (WGS84)
Elevation 1676
Relative position 4 MI. SE OF DOWNIEVILLE.

Site location context

Political divisions (FIPS codes)

Sierra(county)

California(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Downieville(quadrangle 1:24,000 scale)

Portola(quadrangle 1:100,000 scale)

Chico(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Upper Yuba(hydrologic unit)

Lower Sacramento(hydrologic accounting unit)

Sacramento(hydrologic subregion)

California(hydrologic region)

Federal lands

Tahoe National Forest(National Forest)

National Forest FS(Type of land area)

FS(Federal land areas administered by FS)

Geographic areas

Country State County
United States California Sierra

Public Land Survey System information

Meridian Township Range Section Fraction State
Mount Diablo 019N 011E 17 California

Comments on the location information

  • UTM ACC. W 1/2 W 1/2

Commodities

Commodity Importance
Gold Primary
Copper Secondary

Comments on the commodity information

  • 30 FT. LODE ON COMET VEIN SAID TO VARY $1-$9/TON FOR 14 FT. THICKNESS.

Materials information

Materials Type of material
Gold Ore
Quartz Gangue

Analytical data

Result 5 % SULFIDES

Host and associated rocks

  • Host or associated Host
    Rock type Metamorphic Rock > Metasedimentary Rock > Slate

Nearby scientific data

(1) -120.76992, 39.51488
ListMap

Economic information

Ore body information

  • Strike NNW
    Dip 40 W
    Thickness 9.14M

Comments on the geologic information

  • SIX PARALLEL VEINS, COMET VEINS HAVE SLATE HANGING WALL, PORPHYRY FOOT WALL. COMET 1 VEIN 3 FT. THICK, COMET 2 VEIN 10 FT. THICK. ALHAMBRA VEIN, 6-8 FT. THICK AND STRIKES N 10 W. DIPS 80 W COUNTRY ROCK DECOMPOSED AND ALTERED.ALHAMBRA HAS PORPHYRY FOOTWALL & SLATE HANGING WALL.

Economic information about the deposit and operations

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

Comments on the production information

  • NO OTHER PRODUCTION RECORD FOUND.

Workings at the site

  • Type of workings Surface/Underground
    Area 89.034HA
    Overall depth 26.52M
    Overall length 91.44M
    Overall width 1828.8M

Comments on the workings information

  • 4 ADITS, COMET 350 FT., NUMEROUS CROSS CUTS. ALHAMBRA ADIT 380 FT.

Reference information

Bibliographic references

  • Deposit

    MCCULLOCH, W. C., OESTERLING, W. A., SPURCK, W. H., & TISCHLER, M. S., 1964 , MINERALS FOR INDUSTRY, N CALIF.: SO PACIFIC COMPANY, VOL. 2 , P. 48.

  • Deposit

    AVERILL, C. V., 1942 , MINES AND MINERAL RESOURCES OF SIERRA CO.: CDM CALIF. JOUR. MINES AND GEOL., VOL. 38 , NO. 1 , P. 5.

  • Deposit

    LOGAN, C. A., 1929 , SIERRA CO.: CDMM 25TH REPORT STATE MINERALOGIST, APRIL, P. 175.

  • Deposit

    PRESTON, E. B., 1893 , SIERRA CO.: CSMB 11TH REPORT STATE MINERALOGIST FOR 1892 , P. 404.

  • Production

    PRESTON, 1892

General comments

Subject category Comment text
Deposit VEINS

Reporter information

Type Date Name Affiliation Comment
Reporter 01-MAR-1979 Hayden, F. (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.