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  3. Mineral Resource Data System (MRDS)

Noonday

Past Producer in El Dorado county in California, United States with commodities Copper, Gold, 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. Ownership information
  14. Workings at the site
  15. Links to other databases
  16. Bibliographic references
  17. Reporter information

Geologic information

Identification information

Deposit ID 10030136
MRDS ID M008077
Record type Site
Current site name Noonday

Geographic coordinates

Geographic coordinates: -120.79852, 38.64046 (WGS84)
Relative position 4 MI. SE OF EL DORADO; 1/2 MI. E. OF MOTHER LODE.

Site location context

Political divisions (FIPS codes)

El Dorado(county)

California(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Placerville(quadrangle 1:24,000 scale)

Placerville(quadrangle 1:100,000 scale)

Sacramento(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Upper Cosumnes(hydrologic unit)

San Joaquin(hydrologic accounting unit)

San Joaquin(hydrologic subregion)

California(hydrologic region)

Geographic areas

Country State County
United States California El Dorado

Public Land Survey System information

Meridian Township Range Section Fraction State
Mount Diablo 009N 011E 18 California

Commodities

Commodity Importance
Copper Primary
Gold Secondary
Silver Secondary

Materials information

Materials Type of material
Bornite Ore
Chalcopyrite Ore
Pyrite Ore

Host and associated rocks

  • Host or associated Host
    Rock type Metamorphic Rock > Schist

Nearby scientific data

(1) -120.79852, 38.64046
ListMap

Economic information

Ore body information

  • Strike N TO NE
    Dip E
    Width 2.13M

Controls for ore emplacement

  • Shear Zone

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic
Deposit size Small
Significant No
Production years 1900 - 1905 , 1953 , 1956

Ownership information

  • Type Operator
    Owner Noonday Copper Mining Co.

Comments on the production information

  • ACTIVE 1900-05 WHEN IT WAS DEVELOPED BY SHALLOW WORKINGS. SHAFT DEEPENED LATER AND SEVERAL HUNDRED FT. OF DRIFTS WERE DRIVEN WITH ORE CONTAINING 5-9% COPPER AND SOME GOLD AND SILVER MINED. REOPENED IN 1953 AND SEVERAL THOUSAND TONS OF ORE WERE MINED BUT MINE SHUT DOWN IN 1954. REOPENED IN 1956 & RECORDED PRODUCTION FOR 1956 IS 1,400 TONS OF COPPER ORE SHIPPED TO MILL FOR TREATMENT. MINOR AMOUNTS OF GOLD AND SILVER ARE RECOVERED.

Workings at the site

  • Type of workings Underground
    Length 176.78M
    Overall depth 70.1M

Comments on the workings information

  • A 2-COMPARTMENT SHAFT, 230 FT. DEEP WITH LEVELS AT 100 AND 200 FT. AND APPROX. 350 FT. OF DRIFTS

Reference information

Bibliographic references

  • Deposit

    CLARK, W. B. AND CARLSON, D. W., 1956 : MINES AND MINERAL RESOURCES, EL DORADO COUNTY, CA.: CALIF. JOUR. MINES AND GEOLOGY, VOL. 52 , NO. 4 : DIV. OF MINES, P. 396 - 397 , 482 .

  • Deposit

    ERIC, J. H., 1948 : COPPER IN CALIFORNIA BULL. 144 : DIV. OF MINES, P. 230

  • Production

    CLARK & CARLSON, 1957

Reporter information

Type Date Name Affiliation Comment
Reporter 01-JUN-1972 Gere, W. U.S. Geological Survey
Updater 01-DEC-1978 Fraticelli, L. A. (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.