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  3. Mineral Resource Data System (MRDS)

Madeira Claim

Occurrence in Sonoma 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. Host and associated rocks
  9. Nearby scientific data
  10. Ore body information
  11. Economic information about the deposit and operations
  12. Land status
  13. Ownership information
  14. Links to other databases
  15. Bibliographic references
  16. General comments
  17. Reporter information

Geologic information

Identification information

Deposit ID 10095692
MRDS ID M100313
Record type Site
Current site name Madeira Claim

Geographic coordinates

Geographic coordinates: -123.01136, 38.59321 (WGS84)
Elevation 427
Relative position ABOUT 8 MILES NORTH OF GUERNEVILLE

Site location context

Political divisions (FIPS codes)

Sonoma(county)

California(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Cazadero(quadrangle 1:24,000 scale)

Point Arena(quadrangle 1:100,000 scale)

Santa Rosa(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Russian(hydrologic unit)

Northern California Coastal(hydrologic accounting unit)

Klamath-Northern California Coastal(hydrologic subregion)

California(hydrologic region)

Geographic areas

Country State County
United States California Sonoma

Public Land Survey System information

Meridian Township Range Section Fraction State
Mount Diablo 009N 010W 31 California

Commodities

Commodity Importance
Chromium Critical Primary

Materials information

Materials Type of material
Chromite Ore

Analytical data

Result ORE CONTAINED 34% CR2O3

Host and associated rocks

  • Host or associated Host
    Rock type Metamorphic Rock > Serpentinite

Nearby scientific data

(1) -123.01136, 38.59321
ListMap

Economic information

Ore body information

  • General form LENSE

Economic information about the deposit and operations

Development status Occurrence
Commodity type Metallic
Deposit size Small
Significant No
Year of last production 1916

Land status

Ownership category Private

Ownership information

  • Type Owner
    Owner George Madeira, Healdsburg
    First year 1916

Comments on the production information

  • NO RECORD THAT ORE WAS SHIPPED

Comments on the workings information

  • WORKINGS CONSISTED OF SEVERAL OPEN CUTS AND TRENCHES.

Reference information

Bibliographic references

  • Deposit

    LOGAN, C.A., 1918, CHROMIUM, IN BRADLEY, W.W., AND OTHERS, MANGANESE AND CHROMIUM IN CALIFORNIA: CALIF. STATE MINING BUREAU BULLETIN NO. 76, P. 201.

  • Deposit

    DOW, D.H. AND THAYER, T.P., 1946, GEOLOGICAL INVESTIGATIONS OF CHROMITE IN CALIF.: CALIF. DIVISION OF MINES BULLETIN 134 PART 2, CHAPT. 1, P 27, 36.

General comments

Subject category Comment text
Deposit DEPOSIT CONSISTS OF SEVERAL SMALL LENSES ALONG THE SUMMIT OF A RIDGE. THE PROPERTY COMPRISES 40 ACRES.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-JUL-1981 Oster, Karel L. (Albers, John P.) 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.