Twin Cedars Claims

The Twin Cedars Claims is a chromium mine located in Josephine county, Oregon at an elevation of 2,549 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: Twin Cedars Claims  

State:  Oregon

County:  Josephine

Elevation: 2,549 Feet (777 Meters)

Commodity: Chromium

Lat, Long: 42.29194, -123.80833

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 Twin Cedars Claims

Twin Cedars Claims MRDS details

Site Name

Primary: Twin Cedars Claims


Commodity

Primary: Chromium
Tertiary: Platinum
Tertiary: Palladium
Tertiary: Iridium
Tertiary: Ruthenium
Tertiary: Rhodium


Location

State: Oregon
County: Josephine
District: Pearsoll Peak Area


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.
Administrative Organization: Siskiyou National Forest


Holdings

Not available


Workings

Not available


Ownership

Owner Name: Mc Caleb, Mrs. B. A.
Years: 1956 -


Production

Year: 1957
Material type: ORE
Description: Ap_Grade: ^44% Cr2o3 (Weighted Average Grade)


Deposit

Record Type: Site
Operation Category: Occurrence
Operation Type: Unknown
Years of Production:
Organization:
Significant: N
Deposit Size: S


Physiography

General Physiographic Area: Pacific Mountain System
Physiographic Province: Pacific Border Province
Physiographic Section: Klamath Mountains


Mineral Deposit Model

Model Name: Podiform chromite (minor)


Orebody

Form: NARROW STRINGERS


Structure

Not available


Alterations

Not available


Rocks

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

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


Analytical Data

Analytical Data: RH=<5 PPB.
Analytical Data: RU=<100 PPB
Analytical Data: IR=<20 PPB
Analytical Data: PD=8 PPB
Analytical Data: PANNED CONCENTRATE OF SAMPLE GAVE 40.3% CR2O3, 2.19 CR:FE. SAMPLE OF MASSIVE ORE GAVE 24.7% CR2O3, 9.10% FE, 12.1% SIO2. ANOTHER PANNED CONCENTRATE YIELDED 41.94% CR2O3, 23.32% FE. 1 PGE ANALYSIS: PT=<10 PPB
Analytical Data: ABOUT 25% CR2O3


Materials

Ore: Chromite
Gangue: Uvarovite
Gangue: Talc


Comments

Comment (Production): IN 1958 3 TONS OF LOW-GRADE ORE PILED NEAR CUTS.

Comment (Deposit): MOST NOT IN PLACE; ORE ON DUMPS. ODGMI'S MILOC FILE INDICATES THAT MASSIVE AND DISSEMINATED ORE ARE PRESENT

Comment (Workings): SEVERAL OPEN CUTS

Comment (Location): LOCATION GIVEN IS FOR PGE SAMPLE SITE LOCATION. TOPO MAP DOES NOT SHOW A PROSPECT IN AREA.

Comment (Commodity): 2 DEPOSIT - UPPER AND LOWER; LOW GRADE; AL>MG


References

Reference (Deposit): THAYER, T.P., 1974, U.S. GEOLOGICAL SURVEY, UNPUB. DATA.

Reference (Deposit): PAGE, N.J, JOHNSON, M.G., HAFFTY, JOSEPH, AND RAMP, LEN, 1975, OCCURRENCE OF PLATINUM GROUP METALS IN ULTRAMAFIC ROCKS OF THE MEDFORD-COOS BAY 2 DEGREE QUADRANGLE, SOUTHWESTERN OREGON: U.S. GEOLOGICAL SURVEY MISCELLANEOUS FIELD STUDIES MAP MF-694, SCALE 1:250,000.

Reference (Deposit): RAMP, LEN, 1961, CHROMITE IN SOUTHWESTERN OREGON: OREGON DEPARTMENT OF GEOLOGY AND MINERAL INDUSTRIES BULLETIN 52, P. 42.

Reference (Deposit): CARLSON, C.A., AND OTHERS, 1985, ANALYSES FOR PLATINUM-GROUP ELEMENTS IN SAMPLES FROM PODIFORM CHROMITE DEPOSITS, CALIFORNIA AND OREGON: U.S. GEOLOGICAL SURVEY OPEN-FILE REPORT 85-442, 14 P.


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