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Twin Cedars Claims

Occurrence in Josephine county in Oregon, United States with commodities Chromium, Platinum, Palladium, Iridium, Ruthenium, Rhodium
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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. Mineral occurrence model information
  9. Host and associated rocks
  10. Nearby scientific data
  11. Ore body information
  12. Controls for ore emplacement
  13. Economic information about the deposit and operations
  14. Mining district
  15. Land status
  16. Ownership information
  17. Production statistics
  18. Links to other databases
  19. Bibliographic references
  20. General comments
  21. Reporter information

Geologic information

Identification information

Deposit ID 10043102
MRDS ID M061596
Record type Site
Current site name Twin Cedars Claims
Related records 10225585

Geographic coordinates

Geographic coordinates: -123.80949, 42.29176 (WGS84)
Elevation 777
Relative position 2 MI SOUTHEAST OF PEARSOLL PEAK

Site location context

Political divisions (FIPS codes)

Josephine(county)

Oregon(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Pearsoll Peak(quadrangle 1:24,000 scale)

Grants Pass(quadrangle 1:100,000 scale)

Medford(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Illinois(hydrologic unit)

Southern Oregon Coastal(hydrologic accounting unit)

Oregon-Washington Coastal(hydrologic subregion)

Pacific Northwest(hydrologic region)

Federal lands

Rogue River-Siskiyou National Forests(National Forest)

National Forest FS(Type of land area)

FS(Federal land areas administered by FS)

Geographic areas

Country State County
United States Oregon Josephine

Public Land Survey System information

Meridian Township Range Section Fraction State
Willamette 038S 009W 06 SW4 Oregon

Comments on the location information

  • LOCATION GIVEN IS FOR PGE SAMPLE SITE LOCATION. TOPO MAP DOES NOT SHOW A PROSPECT IN AREA.

Commodities

Commodity Importance
Chromium Critical Primary
Platinum Critical Tertiary
Palladium Critical Tertiary
Iridium Critical Tertiary
Ruthenium Critical Tertiary
Rhodium Critical Tertiary

Comments on the commodity information

  • 2 DEPOSIT - UPPER AND LOWER; LOW GRADE; AL>MG

Materials information

Materials Type of material
Chromite Ore
Talc Gangue
Uvarovite Gangue

Analytical data

Result ABOUT 25% CR2O3
Result 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
Result PD=8 PPB
Result IR=<20 PPB
Result RU=<100 PPB
Result RH=<5 PPB.

Mineral occurrence model information

Model code 15
USGS model code 8a
Deposit model name Podiform chromite (minor)
Mark3 model number none

Host and associated rocks

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

Nearby scientific data

(1) -123.80949, 42.29176
ListMap

Economic information

Ore body information

  • General form NARROW STRINGERS
    Strike N20E
    Dip 50SW

Controls for ore emplacement

  • Magmatic Segregaton

Economic information about the deposit and operations

Development status Occurrence
Commodity type Metallic
Deposit size Small
Significant No

Mining district

District name Pearsoll Peak Area

Land status

Ownership category National Forest
Area name Siskiyou National Forest

Ownership information

  • Type Owner
    Owner Mc Caleb, Mrs. B. A.
    First year 1956

Production statistics

  • Year 1957
    Material ORE
    Accuracy Estimate
    Description Ap_Grade: ^44% Cr2o3 (Weighted Average Grade)
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Cr2O3 Chromium Chromium 44wt-pct

Comments on the production information

  • IN 1958 3 TONS OF LOW-GRADE ORE PILED NEAR CUTS.

Comments on the workings information

  • SEVERAL OPEN CUTS

Reference information

Bibliographic references

  • Deposit

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

  • Deposit

    THAYER, T.P., 1974, U.S. GEOLOGICAL SURVEY, UNPUB. DATA.

  • 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.

  • 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.

General comments

Subject category Comment text
Deposit MOST NOT IN PLACE; ORE ON DUMPS. ODGMI'S MILOC FILE INDICATES THAT MASSIVE AND DISSEMINATED ORE ARE PRESENT

Reporter information

Type Date Name Affiliation Comment
Reporter 01-MAY-1976 Johnson, Maureen G. U.S. Geological Survey
Updater 01-APR-1981 Ferns, Mark L. (Brooks, Howard C.) Oregon Department of Geology and Mineral Industries
Updater 01-MAY-1989 Peterson, Jocelyn A. U.S. Geological Survey

Beyond USGS

Supplemental information added by qvyshift.com. Not part of the original USGS MRDS record.

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