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  2. Online Spatial Data
  3. Mineral Resource Data System (MRDS)

Bernal

Past Producer in Santa Clara county in California, United States with commodity Mercury
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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. Alteration
  9. Host and associated rocks
  10. Nearby scientific data
  11. Geologic structures
  12. Ore body information
  13. Controls for ore emplacement
  14. Economic information about the deposit and operations
  15. Mining district
  16. Ownership information
  17. Workings at the site
  18. Links to other databases
  19. Bibliographic references
  20. Reporter information

Geologic information

Identification information

Deposit ID 10040736
MRDS ID M055600
Record type Site
Current site name Bernal

Geographic coordinates

Geographic coordinates: -121.79325, 37.21992 (WGS84)
Elevation 183
Relative position 10 MI SE OF SAN JOSE

Site location context

Political divisions (FIPS codes)

Santa Clara(county)

California(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Santa Teresa Hills(quadrangle 1:24,000 scale)

San Jose(quadrangle 1:100,000 scale)

San Jose(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Coyote(hydrologic unit)

San Francisco Bay(hydrologic accounting unit)

San Francisco Bay(hydrologic subregion)

California(hydrologic region)

Federal lands

LG(Federal land areas administered by LG)

Geographic areas

Country State County
United States California Santa Clara

Public Land Survey System information

Meridian Township Range Section Fraction State
Mount Diablo 008S 002E 19 California

Comments on the location information

  • LOCATION UNCERTAIN N SLOPE SANTA TERESA HILLS

Commodities

Commodity Importance
Mercury Primary

Materials information

Materials Type of material
Cinnabar Ore
Dolomite Gangue
Quartz Gangue

Alteration

  • (Local) Silica Carbonate Alteration Of Serpentine

Host and associated rocks

  • Host or associated Host
    Rock type Metamorphic Rock > Serpentinite
    Stratigraphic age (youngest) Late Cretaceous

Nearby scientific data

(1) -121.79325, 37.21992
ListMap

Economic information

Geologic structures

Type of structure Local
Structure description Local Fracturing, Clay - Serpentine Contact

Ore body information

  • General form IRREGULAR

Controls for ore emplacement

  • Local Fracturing

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic
Deposit size Small
Significant No
Discovery year 1918

Mining district

District name New Almaden

Ownership information

  • Type Owner
    Owner Pedro A Bernal

Comments on the production information

  • ORE RAN 3 LB/TON

Comments on the reserve resource information

  • NO VISIBLE RESERVES

Workings at the site

  • Type of workings Underground
    Length 60.96M

Comments on the workings information

  • INACTIVE SINCE 1918

Reference information

Bibliographic references

Reporter information

Type Date Name Affiliation Comment
Reporter 01-JUL-1976 Peterson, Jocelyn A. 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.