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Seeley Group

Past Producer 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. Alteration
  9. Host and associated rocks
  10. Nearby scientific data
  11. Geologic structures
  12. Ore body information
  13. Economic information about the deposit and operations
  14. Land status
  15. Ownership information
  16. Links to other databases
  17. Bibliographic references
  18. General comments
  19. Reporter information

Geologic information

Identification information

Deposit ID 10043683
MRDS ID M100582
Record type Site
Current site name Seeley Group
Alternate or previous names Claims: Central, Climax Creek, Crown Point, Outpost No, 1 and No.2, Ore Bag
Related records 10116980

Geographic coordinates

Geographic coordinates: -120.67708, 35.37136 (WGS84)
Elevation 768
Relative position APPROX. 5 KM NW OF CUESTA PASS ON HIGHWAY 101.

Site location context

Political divisions (FIPS codes)

San Luis Obispo(county)

California(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

San Luis Obispo(quadrangle 1:24,000 scale)

San Luis Obispo(quadrangle 1:100,000 scale)

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

Hydrologic units (watersheds)

Salinas(hydrologic unit)

Central California Coastal(hydrologic accounting unit)

Central California Coastal(hydrologic subregion)

California(hydrologic region)

Federal lands

Los Padres National Forest(National Forest)

National Forest FS(Type of land area)

FS(Federal land areas administered by FS)

Geographic areas

Country State County
United States California San Luis Obispo

Public Land Survey System information

Meridian Township Range Section Fraction State
Mount Diablo 029S 012E 27;27;27 NW OF SE OF SW California

Comments on the location information

  • MINE MARKED IN SW 1/4 OF SECT. 27, T. 29 S., R. 12 E., USED AS LOCATION POINT FOR THIS GROUP.

Commodities

Commodity Importance
Chromium Critical Primary

Comments on the commodity information

  • ANALYTICAL DATA FROM 1950'S PRODUCTION.

Materials information

Materials Type of material
Chromite Ore

Alteration

  • (Local) Serpentinized Dunite

Analytical data

Result CONCENTRATES AVG. 45.6 % CR2O3
Result MILLING ORE AVG. 11.5% CR2O3

Host and associated rocks

  • Host or associated Host
    Rock type Plutonic Rock > Ultramafic Intrusive Rock > Peridotite > Dunite
    Rock unit name Franciscan
    Rock description Franciscan
    Stratigraphic age (youngest) Late Jurassic

Nearby scientific data

(1) Lower Cretaceous marine rocks
ListMap

Economic information

Geologic structures

Type of structure Local
Structure description Volc. And Sed. Rocks Are Folded Into A Syncline Which Is Roughly Symmetric About Ridge Crest.

Ore body information

  • General form IRREGULAR

Comments on the geologic information

  • THIS DEPOSIT OCCURS IN AN ELONGATE NW-SE TRENDING ULTRAMAFIC BODY EXPOSED FOR 16 KM ON THE CREST OF THE MAIN RIDGE OF THE SANTA LUCIA RANGE

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic
Deposit size Small
Significant No
Year of first production 1885
Year of last production 1955

Land status

Ownership category National Forest

Ownership information

  • Type Operator
    Owner San Luis Mining Co.
    Home office San Luis Obispo, CA

Comments on the production information

  • APPROX. 500-600 TONS ORE MINED DURING WWI, BUT LITTLE WAS SHIPPED. TOTAL PROD. CLOSE TO 1950'S FIGURES.

Comments on the workings information

  • WORKINGS ON MOST CLAIMS CONSIST OF OPEN CUTS, PITS AND DRIFTS NOW MOSTLY CAVED (1975).

Reference information

Bibliographic references

  • Deposit

    STINSON, M. C., 1975, CDMG MINERAL PROPERTY REPORT, UNPUBLISHED

  • Deposit

    SMITH, C. T. AND GRIGGS, A. B., 1944, CHROMITE DEPOSITS NEAR SON LUIS OBISPO COUNTY, CA., USGS BULL 945-B, PP. 42-43.

  • Production

    CDMG MINERAL PROP. REPORT, UNPUBLISHED

General comments

Subject category Comment text
Deposit TWO PRODUCTIVE ORE ZONES WERE DISCOVERED: WESTERN ORE BODY, TRENDING N 60 W AND UP TO 50 FT. WIDE ; THE EASTERN ORE BODY, TRENDING N 65 W AND UP TO 10 FT WIDE.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-MAR-1982 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.