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A-J Burkhart

Past Producer in Mariposa 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. Ownership information
  13. Links to other databases
  14. Bibliographic references
  15. General comments
  16. Reporter information

Geologic information

Identification information

Deposit ID 10030916
MRDS ID M009404
Record type Site
Current site name A-J Burkhart

Geographic coordinates

Geographic coordinates: -120.17099, 37.56131 (WGS84)
Relative position 3 MI. WEST FROM BEAR VALLEY

Site location context

Political divisions (FIPS codes)

Mariposa(county)

California(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Hornitos(quadrangle 1:24,000 scale)

Oakdale(quadrangle 1:100,000 scale)

San Jose(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Fresno River(hydrologic unit)

San Joaquin(hydrologic accounting unit)

San Joaquin(hydrologic subregion)

California(hydrologic region)

Geographic areas

Country State County
United States California Mariposa

Public Land Survey System information

Meridian Township Range Section Fraction State
Mount Diablo 004S 016E 26 California

Comments on the location information

  • PROBABLY NE 1/4 - UTM EST.

Commodities

Commodity Importance
Gold Primary
Copper Tertiary

Comments on the commodity information

  • MINOR AMOUNTS GREEN CU CARBONATES

Materials information

Materials Type of material
Chalcopyrite Ore
Gold Ore
Pyrite Ore
Quartz Gangue

Host and associated rocks

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

Nearby scientific data

(1) -120.17099, 37.56131
ListMap

Economic information

Ore body information

  • General form PINCH AND SWELL
    Strike N
    Dip STEEPLY E
    Thickness 1.22M

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic
Deposit size Small
Significant No
Discovery year 1925
Production years - 1954

Ownership information

  • Type Operator
    Owner B. F. And Ruth L. Burkhart

Comments on the production information

  • WORKED INTERMITTENTLY UP TO THE FALL OF 1954; MOST RECENT OPERATION BY RICHARDSON BROS. TERMINATED MAY, 1954. RECENT PRODUCTION SMALL WITH ORE AVERAGING ABOUT 0.4 OZ. OF GOLD PER TON.

Comments on the workings information

  • FIRST OPENED IN 1920'S WHEN A 220-FT. ADIT WAS DRIVEN; A 150 FT. SHAFT AND 3 LEVELS 35 FT. APART ARE THE PRINCIPAL ACTIVE WORKINGS.

Reference information

Bibliographic references

  • Deposit

    BOWEN O. E., JR., & GRAY, H., JR., 1957 , MINES AND MINERAL DEPOSITS OF MARIPOSA COUNTY, CALIF.: CALIF. JOUR. MINES & GEOL., VOL. 53 , NOS. 1 & 2 , P. 232 .

  • Deposit

    WALLACE, R. E., ETAL, 1957 , THE MINERAL INDUSTRY OF CALIF.: U. S. BUR. OF MINES MINERALS YEARBOOK FOR 1954 , VOL. 3 , P. 220 .

  • Production

    BOWEN AND GRAY, 1957

General comments

Subject category Comment text
Deposit VEIN
Deposit ONE UNPATENTED CLAIM. VEIN MINERALS INCLUDE PYRITE, CHALCOPYRITE AND FREE GOLD WITH MINOR AMOUNTS OF GREEN COPPER CARBONATES.
Deposit Discovery Year: 1920'S

Reporter information

Type Date Name Affiliation Comment
Reporter 01-JUN-1973 Gere, W. U.S. Geological Survey
Updater 01-DEC-1978 Hayden, F. (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.