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  3. Mineral Resource Data System (MRDS)

Fourth of July Claim

Occurrence in Napa county in California, United States with commodity Chromium
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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. Nearby scientific data
  9. Economic information about the deposit and operations
  10. Ownership information
  11. Links to other databases
  12. Bibliographic references
  13. General comments
  14. Reporter information

Geologic information

Identification information

Deposit ID 10031645
MRDS ID M010763
Record type Site
Current site name Fourth of July Claim

Geographic coordinates

Geographic coordinates: -122.45162, 38.71627 (WGS84)

Site location context

Political divisions (FIPS codes)

Napa(county)

California(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Aetna Springs(quadrangle 1:24,000 scale)

Healdsburg(quadrangle 1:100,000 scale)

Santa Rosa(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Lower Sacramento(hydrologic accounting unit)

Sacramento(hydrologic subregion)

California(hydrologic region)

Geographic areas

Country State County
United States California Napa

Public Land Survey System information

Meridian Township Range Section Fraction State
Mount Diablo 010N 005W 18 California

Commodities

Commodity Importance
Chromium Critical Primary

Materials information

Materials Type of material
Chromite Ore

Nearby scientific data

(1) -122.45162, 38.71627
ListMap

Economic information

Economic information about the deposit and operations

Development status Occurrence
Commodity type Metallic
Significant No

Ownership information

  • Type Operator
    Owner Frank Rhoda

Comments on the production information

  • FIFTEEN TONS OF ORE HAD BEEN MINED.

Comments on the workings information

  • OPEN CUT.

Reference information

Bibliographic references

  • Deposit

    CALIF. BULL. 134, PT. 2, CHAPTER 1, DEC. 1946, P. 23

General comments

Subject category Comment text
Deposit ALTHOUGH THE ORE APPEARED TO BE MASSIVE, IT WAS SAID TO ASSAY ONLY 42.2% CR2O3.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-JUN-1973 Gere, W. 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.