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Gopher Hill Mine

Past Producer in Calaveras county in California, United States with commodities Gold, Silver, Copper, Lead, 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. Host and associated rocks
  9. Nearby scientific data
  10. Geologic structures
  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 10028623
MRDS ID M005707
Record type Site
Current site name Gopher Hill Mine
Alternate or previous names Gopher Ridge
Related records 10162756

Geographic coordinates

Geographic coordinates: -120.74518, 37.95435 (WGS84)
Elevation 244
Relative position 2 MI N. OF TELEGRAPH CITY BY BUCKHORN CREEK

Site location context

Political divisions (FIPS codes)

Calaveras(county)

California(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Copperopolis(quadrangle 1:24,000 scale)

Oakdale(quadrangle 1:100,000 scale)

San Jose(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Lower San Joaquin River(hydrologic unit)

San Joaquin(hydrologic accounting unit)

San Joaquin(hydrologic subregion)

California(hydrologic region)

Geographic areas

Country State County
United States California Calaveras

Public Land Survey System information

Meridian Township Range Section Fraction State
Mount Diablo 001N 011E 10 California

Comments on the location information

  • UTM ACC NE 1/4 SEC

Commodities

Commodity Importance
Gold Primary
Silver Primary
Copper Secondary
Lead Tertiary
Zinc Critical Tertiary

Materials information

Materials Type of material
Bismuth Ore
Gold Ore
Quartz Gangue

Analytical data

Result ASSAY SAMPLES RANGE FROM $.85 TO $14. PER TON AU AND FROM 0.01 TO 39.0 OZ PER TON IN AG

Host and associated rocks

  • Host or associated Host
    Rock type Metamorphic Rock > Metavolcanic Rock > Mafic Metamorphic Rock > Greenstone

Nearby scientific data

(1) -120.74518, 37.95435
ListMap

Economic information

Geologic structures

Type of structure Local
Structure description Shear Zones With A Nw Trend And Steeply Dipping

Ore body information

  • Strike NW
    Dip NE
    Thickness 0.46M

Controls for ore emplacement

  • Along Shear Zones And Elsewhere In Schistose Rks Much Finely Disseminated Pyrite Is Present These Pyritized Zones Generally Carry Some Au And Ag

Comments on the geologic information

  • TO SOUTH OF MINE THERE IS QTZ PORPHYRY INTRUSION, WHICH IS 5 - 700 FT IN DIAMETER, AND RESPONSIBLE FOR SHEAR ZONES NEAR MINE.

Economic information about the deposit and operations

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

Comments on the production information

  • ACTIVE 1921 , 1934 - 1936

Workings at the site

  • Type of workings Underground
    Length 117.04M

Comments on the workings information

  • DEVELOPED BY 84 FT SHAFT WITH LEVELS AT 40 AND 80 FT

Reference information

Bibliographic references

  • Deposit

    CLARK, W. B., LYDON, P. A, 1962 , MINES AND MINERAL RESOURCES OF CALAVERAS COUNTY, CALIF. COUNTY REPORT 2 ; CALIF. DIV. OF MINES AND GEOLOGY, P 132 , 155 AND PL B & D

  • Deposit

    GOODWIN, J. G., 1957 , LEAD AND ZINC IN CALIF.: CALIF. DIV. MINES. VOL. 53 , NOS. 3 & 4 , P 122 & 220 .

  • Deposit

    LOGAN, C. A., FRANKE, H., 1936 , MINES AND MINERAL RESOURCES OF CALAVERAS COUNTY; CALIF. JOUR. MINES AND GEOLOGY, VOL. 32 , NO. 3 ; DIV. OF MINES, P 262

  • Deposit

    JENKINS, O. P., 1948 , COPPER IN CALIF.; CALIF DIV. OF MINES BULL 144 PG 122, AND 220

  • Production

    CLARK, ( 1962 ) LOGAN ( 1932 )

General comments

Subject category Comment text
Deposit VEIN, 1 1/2 FT THICK IN PYRITIZED GREENSTONE. 2/3 OF ROCK IS BASE ORE WITH TRACES OF ARSENIC AND BISMUTH. NEITHER CU OR ZINC ORE OBSERVED IN PLACE. HENCE LITTLE PROMISE FOR PRODUCTION OF THESE METALS.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-FEB-1979 Mateik, R.; 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.