Seeley Group

The Seeley Group is a chromium mine located in San Luis Obispo county, California at an elevation of 2,520 feet.

About the MRDS Data:

All mine locations were obtained from the USGS Mineral Resources Data System. The locations and other information in this database have not been verified for accuracy. It should be assumed that all mines are on private property.

Mine Info

Name: Seeley Group

State:  California

County:  San Luis Obispo

Elevation: 2,520 Feet (768 Meters)

Commodity: Chromium

Lat, Long: 35.37139, -120.67611

Map: View on Google Maps

Satelite View

MRDS mine locations are often very general, and in some cases are incorrect. Some mine remains have been covered or removed by modern industrial activity or by development of things like housing. The satellite view offers a quick glimpse as to whether the MRDS location corresponds to visible mine remains.


Satelite image of the Seeley Group

Seeley Group MRDS details

Site Name

Primary: Seeley Group
Secondary: Claims: Central
Secondary: Climax Creek
Secondary: Crown Point
Secondary: Outpost No, 1 and No.2
Secondary: Ore Bag


Commodity

Primary: Chromium


Location

State: California
County: San Luis Obispo


Land Status

Land ownership: National Forest
Note: the land ownership field only identifies whether the area the mine is in is generally on public lands like Forest Service or BLM land, or if it is in an area that is generally private property. It does not definitively identify property status, nor does it indicate claim status or whether an area is open to prospecting. Always respect private property.


Holdings

Not available


Workings

Not available


Ownership

Owner Name: San Luis Mining Co.
Home Office: San Luis Obispo, CA


Production

Not available


Deposit

Record Type: Site
Operation Category: Past Producer
Operation Type: Unknown
Year First Production: 1885
Year Last Production: 1955
Discovery Method: Unknown
Years of Production:
Organization:
Significant: N
Deposit Size: S


Physiography

General Physiographic Area: Pacific Mountain System
Physiographic Province: Pacific Border Province
Physiographic Section: California Coast Ranges
Physiographic Detail: Santa Lucia Range


Mineral Deposit Model

Not available


Orebody

Form: IRREGULAR


Structure

Type: L
Description: Volc. And Sed. Rocks Are Folded Into A Syncline Which Is Roughly Symmetric About Ridge Crest.


Alterations

Alteration Type: L
Alteration Text: Serpentinized Dunite


Rocks

Name: Dunite
Role: Host
Age Type: Host Rock Unit
Age Young: Late Jurassic


Analytical Data

Analytical Data: MILLING ORE AVG. 11.5% CR2O3
Analytical Data: CONCENTRATES AVG. 45.6 % CR2O3


Materials

Ore: Chromite


Comments

Comment (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.

Comment (Commodity): ANALYTICAL DATA FROM 1950'S PRODUCTION.

Comment (Production): APPROX. 500-600 TONS ORE MINED DURING WWI, BUT LITTLE WAS SHIPPED. TOTAL PROD. CLOSE TO 1950'S FIGURES.

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

Comment (Geology): 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

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


References

Reference (Deposit): STINSON, M. C., 1975, CDMG MINERAL PROPERTY REPORT, UNPUBLISHED

Reference (Production): CDMG MINERAL PROP. REPORT, UNPUBLISHED

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


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