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Tennessee Chromite

Occurrence in Josephine county in Oregon, United States with commodities Chromium, Platinum, Palladium, Iridium, Ruthenium, Rhodium
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Geologic information

Identification information

Deposit ID 10043142
MRDS ID M061651
Record type Site
Current site name Tennessee Chromite
Related records 10298214

Geographic coordinates

Geographic coordinates: -123.72116, 42.19565 (WGS84)
Elevation 564
Relative position 4 MI WEST OF KERBY
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Geographic areas

Country State County
United States Oregon Josephine

Public Land Survey System information

Meridian Township Range Section Fraction State
Willamette 039S 009W 11 NE4 OF NE4 Oregon

Comments on the location information

  • ON SOUTHWEST SIDE OF TENNESSEE MOUNTAIN. LOCATION GIVEN IS FOR PGE SAMPLE SITE LOCATION. TOPO MAP SHOWS NO PROSPECTS NEARBY.

Commodities

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

Comments on the commodity information

  • CHROMITE REMARKABLY FREE FROM GANGUE

Materials information

Materials Type of material
Chromite Ore
Olivine Gangue
Serpentine Gangue

Alteration

  • (Local) Country Rock Serpentinized

Analytical data

Result 3 ASSAYS: 53.60% CR2O3, 12.99% FE
Result 55.54% CR2O3, 11.08% FE
Result 54.70% CR2O3, 11.08% FE
Result 1 PGE ANALYSIS: PT=<10 PPB
Result PD=4 PPB
Result IR=70 PPB
Result RU=300 PPB
Result RH=18 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;Pearsoll Peak Ophiolite
    Rock description Pearsoll Peak Ophiolite;Pearsoll Peak Ophiolite

Nearby scientific data

(1) -123.72116, 42.19565
ListMap

Ore body information

  • General form LENS
    Strike N45W
    Dip 35-40SW
    Width 0.36M

Controls for ore emplacement

  • Magmatic Segregaton

Comments on the geologic information

  • PERIDOTITE IS BLOCKY

Economic information

Economic information about the deposit and operations

Development status Occurrence
Commodity type Metallic
Deposit size Small
Significant No

Land status

Ownership category National Forest
Area name Siskiyou National Forest

Ownership information

  • Type Owner
    Owner Murphy, T. E.
    First year 1958
  • Type Owner
    Owner Young, G. C.
    First year 1958
  • Type Operator
    Owner Evans, Ray G.
    First year 1958

Production statistics

  • Year 1958
    Period 1958
    Material ORE
    Accuracy Estimate
    Description Cp_Grade: ^52.58% Cr2o3 (Weighted Average Grade), 11.41% Fe, 3.64%Si02
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Cr2O3 Chromium Chromium 53wt-pct
    Ore Iron Iron 11wt-pct
    SIL Silica Silica 4wt-pct

Workings at the site

  • Type of workings Surface/Underground
    Length 7.62M
    Overall length 1.52M
    Overall width 1.22M

Comments on the workings information

  • SHALLOW BENCH, TUNNEL, CUT

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS M061651
U.S. Bureau of Mines Minerals Availability System MAS 0410330544

Bibliographic references

  • Deposit

    RAMP, LEN, 1961, CHROMITE IN SOUTHWESTERN OREGON: OREGON DEPARTMENT OF GEOLOGY AND MINERAL INDUSTRIES BULLETIN 52, P. 155.

  • 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

    RAMP, LEN, AND PETERSON, N.V., 1979, GEOLOGY AND MINERAL RESOURCES OF JOSEPHINE COUNTY, OREGON: OREGON DEPARTMENT OF GEOLOGY AND MINERAL INDUSTRIES BULLETIN 100, TABLE 1.

  • Deposit

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

General comments

Subject category Comment text
Deposit SOME DISSEMINATED ORE IS PRESENT DOWNHILL FROM MAIN LENS

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