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Rough Crossing Claim

Producer 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 10043534
MRDS ID M100315
Record type Site
Current site name Rough Crossing Claim

Geographic coordinates

Geographic coordinates: -123.08386, 38.61349 (WGS84)
Relative position ASSUMED SPOT IN CENTER OF SECT. 21.

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 011W 21 California

Commodities

Commodity Importance
Chromium Critical Primary

Materials information

Materials Type of material
Chromite Ore

Analytical data

Result SHIPPING GRADE ORE 40% CR2O3
Result DEPOSIT AS A WHOLE 6% OR LESS CR2O3.

Host and associated rocks

  • Host or associated Host
    Rock type Metamorphic Rock > Serpentinite

Nearby scientific data

(1) Franciscan melange
ListMap

Economic information

Ore body information

  • General form IRREGULAR

Economic information about the deposit and operations

Development status Producer
Commodity type Metallic
Deposit size Small
Significant No

Land status

Ownership category Private

Ownership information

  • Type Operator
    Owner Ash, K. K.
    Home office Healdsburg, Ca.
  • Type Owner
    Owner Eakles Brothers
    First year 1918

Comments on the production information

  • LESS THAN 150 LONG TONS OF ORE PRODUCES. A SMALL DEPOSIT ABOUT A MILE TO THE SE YIELDED 12 TONS OF ORE. CONTAINING APPROXIMATLEY 40% CHROMITE, BUT NONE OF IT WAS SHIPPED.

Reference information

Bibliographic references

  • 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. 28, 36

General comments

Subject category Comment text
Deposit DEPOSIT CONSISTS OF NARROW STRINGERS AND IS EXTENSIVE.

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.