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Copper Hill

Producer in Amador county in California, United States with commodities Copper, Silver, Gold, Zinc
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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. Mineral occurrence model information
  9. Host and associated rocks
  10. Nearby scientific data
  11. Ore body information
  12. Controls for ore emplacement
  13. Economic information about the deposit and operations
  14. Workings at the site
  15. Links to other databases
  16. Bibliographic references
  17. General comments
  18. Reporter information

Geologic information

Identification information

Deposit ID 10109409
MRDS ID M020441
Record type Site
Current site name Copper Hill
Alternate or previous names Cosumnes, Hobo
Related records 10162832

Geographic coordinates

Geographic coordinates: -120.96769, 38.50184 (WGS84)
Elevation 183

Site location context

Political divisions (FIPS codes)

Amador(county)

California(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Latrobe(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 Amador

Public Land Survey System information

Meridian Township Range Section Fraction State
Mount Diablo 008N 009E 34,35 California

Commodities

Commodity Importance
Copper Primary
Silver Secondary
Gold Secondary
Zinc Critical Secondary

Materials information

Materials Type of material
Bornite Ore
Chalcopyrite Ore
Malachite Ore
Pyrite Ore

Mineral occurrence model information

Model code 184
USGS model code 28a
Deposit model name Massive sulfide, kuroko
Mark3 model number 93

Host and associated rocks

  • Host or associated Host
    Rock type Metamorphic Rock > Schist
    Rock unit name Logtown Ridge Formation
    Rock description Logtown Ridge Formation
    Stratigraphic age (youngest) Late Jurassic
    Stratigraphic age (youngest) Late Jurassic

Nearby scientific data

(1) -120.96769, 38.50184
ListMap

Economic information

Ore body information

  • General form LENTICULAR
    Strike NW
    Dip 60 NE

Controls for ore emplacement

  • Mineralization Occurs In A Shear And Brecciated Zone In Logtown Ridge Metavolcanic Rocks.

Economic information about the deposit and operations

Development status Producer
Commodity type Metallic
Deposit size Large
Significant No

Comments on the production information

  • LARGE COPPER PRODUCER IN THE PAST. U. S. BUREAU OF MINES DISCLOSED THREE SEPARATE LENSES OF ORE IN AN UNDEVELOPED BLOCK DURING 1943 BY 2864 FT. OF DIAMOND DRILLING. ONE DRILL HOLE NE OF JACKASS SHAFT ASSAYED 22.37 % ZN, .43 % CU, 9.31 OZ/TON AG, AND .02 OZ/TON AU.

Workings at the site

  • Type of workings Underground
    Area 1011.75HA
    Length 1584.96M
    Overall depth 213.36M

Comments on the workings information

  • OVER 1200 FT. OF SHAFTS, AND OVER 1800 FT. OF DRIFTS. MAIN SHAFT ON THE COSUMNES.

Reference information

Bibliographic references

  • Deposit

    CARLSON, D. W. AND CLARK, W. B., 1954 , MINES AND MINERAL RESOURCES, AMADOR COUNTY; CALIF. JOUR. MINES AND GEOLOGY, VOL. 50 , NO. 1 , P. 159

  • Deposit

    GOODWIN, J. G., 1957 , LEAD AND ZINC IN CALIFORNIA; CALIF. JOUR. MINES AND GEOLOGY, VOL. 53 , NO. 3 & 4 , P. 417

General comments

Subject category Comment text
Deposit GOSSAN CAPPED
Deposit AS OF 1954 , THE JACKASS SHAFT WAS SURVEYED AND REOPENED.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-JUN-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.

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.