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  3. Mineral Resource Data System (MRDS)

Big Break

Past Producer in Mariposa county in California, United States with commodity Gold
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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. Mining district
  13. Ownership information
  14. Links to other databases
  15. Bibliographic references
  16. General comments
  17. Reporter information

Geologic information

Identification information

Deposit ID 10030863
MRDS ID M009328
Record type Site
Current site name Big Break
Alternate or previous names Big Break Ext No. 1, Contact Lode
Related records 10212164

Geographic coordinates

Geographic coordinates: -120.17543, 37.67353 (WGS84)
Relative position ABOUT 2 1/2 AIRLINES MI. SE OF COULTERVILLE.

Site location context

Political divisions (FIPS codes)

Mariposa(county)

California(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Coulterville(quadrangle 1:24,000 scale)

Oakdale(quadrangle 1:100,000 scale)

San Jose(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Upper Merced(hydrologic unit)

San Joaquin(hydrologic accounting unit)

San Joaquin(hydrologic subregion)

California(hydrologic region)

Federal lands

Bureau of Land Management(Bureau of Land Management CA)

Bureau of Land Management CA BLM(Type of land area)

BLM(Federal land areas administered by BLM)

Geographic areas

Country State County
United States California Mariposa

Public Land Survey System information

Meridian Township Range Section Fraction State
Mount Diablo 003S 016E 14 California

Comments on the location information

  • UTM EST. ADJOINS VIRGINIA MINE ON THE NW. THERE ARE SEVERAL UNIDENTIFIED WORKINGS ON THE N 1/2 OF THE SECTION.

Commodities

Commodity Importance
Gold Primary

Materials information

Materials Type of material
Gold Ore
Quartz Gangue

Host and associated rocks

  • Host or associated Associated
    Rock type Plutonic Rock > Mafic Intrusive Rock
  • Host or associated Host
    Rock type Metamorphic Rock > Metasedimentary Rock > Slate
  • Host or associated Host
    Rock type Metamorphic Rock > Metavolcanic Rock > Mafic Metamorphic Rock > Greenstone

Nearby scientific data

(1) -120.17543, 37.67353
ListMap

Economic information

Ore body information

  • Strike NW
    Dip NE

Comments on the geologic information

  • GEOL.DESC: GREENSTONE, SLATE & SERPENTINE ARE CUT BY BASIC DIKES.

Economic information about the deposit and operations

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

Mining district

District name Coulterville

Ownership information

  • Type Operator
    Owner Bryan A. Miller

Comments on the production information

  • DEVELOPMENT WORK IS DONE INTERMITTENTLY; NO RECORDED PRODUCTION.

Comments on the workings information

  • 40-FT. SHAFT WITH SOME CONNECTING DRIFTS.

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. 239

General comments

Subject category Comment text
Deposit QUARTZ VEIN
Deposit THREE UNPATENTED CONTIGUOUS CLAIMS.

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.