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Rancho Piedra Blanca Occurrence

Occurrence in San Luis Obispo 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. Economic information about the deposit and operations
  11. Mining district
  12. Land status
  13. Ownership information
  14. Links to other databases
  15. Bibliographic references
  16. Reporter information

Geologic information

Identification information

Deposit ID 10043658
MRDS ID M100479
Record type Site
Current site name Rancho Piedra Blanca Occurrence

Geographic coordinates

Geographic coordinates: -121.22071, 35.78745 (WGS84)
Elevation 488
Location accuracy 1000(meters)
Relative position Assumed Spot Center Sect. 4, Assumed Spot Center Sect. 4, Assumed Spot Center Sect. 4

Site location context

Political divisions (FIPS codes)

San Luis Obispo(county)

California(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Burnett Peak(quadrangle 1:24,000 scale)

Cambria(quadrangle 1:100,000 scale)

San Luis Obispo(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Central Coastal(hydrologic unit)

Central California Coastal(hydrologic accounting unit)

Central California Coastal(hydrologic subregion)

California(hydrologic region)

Geographic areas

Country State County
United States California San Luis Obispo

Public Land Survey System information

Meridian Township Range Section Fraction State
Mount Diablo 025S 007E 04 California

Commodities

Commodity Importance
Chromium Critical Primary

Materials information

Materials Type of material
Chromite Ore

Host and associated rocks

  • Host or associated Host
    Rock type Metamorphic Rock > Serpentinite
    Rock unit name Franciscan
    Rock description Franciscan
    Stratigraphic age (youngest) Late Cretaceous
    Stratigraphic age (youngest) Late Jurassic

Nearby scientific data

(1) -121.22071, 35.78745
ListMap

Economic information

Comments on the geologic information

  • CHROMITE OCCURS IN NUMEROUS SERPENTINIZED ULTRAMAFIC BODIES THAT ARE WIDELY DISTRIBUTED IN A NW TRENDING BELT OF THE FRANCISCAN FM

Economic information about the deposit and operations

Development status Occurrence
Commodity type Metallic
Deposit size Small
Significant No

Mining district

District name Northern San Luis Obispo Area

Land status

Ownership category Private

Ownership information

  • Type Owner
    Owner Mrs. P. A. Hearst
    First year 1918

Reference information

Bibliographic references

  • Deposit

    WALKER, G.W. AND GRIGGS, A.B., 1953, CDMG BULL 134, PART 2, CHAPT. 2, P. 58, 84

Reporter information

Type Date Name Affiliation Comment
Reporter 01-JUN-82 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.