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Violet

Producer 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. Alteration
  9. Mineral occurrence model information
  10. Host and associated rocks
  11. Nearby scientific data
  12. Geologic structures
  13. Ore body information
  14. Controls for ore emplacement
  15. Economic information about the deposit and operations
  16. Mining district
  17. Land status
  18. Production statistics
  19. Links to other databases
  20. Bibliographic references
  21. General comments
  22. Reporter information

Geologic information

Identification information

Deposit ID 10042650
MRDS ID M060523
Record type Site
Current site name Violet
Alternate or previous names Briggs Creek Sordy, Part of Sordy Group
Related records 10152356

Geographic coordinates

Geographic coordinates: -123.72894, 42.44232 (WGS84)
Elevation 1122
Relative position 2 MI WEST OF BRIGGS VALLEY

Site location context

Political divisions (FIPS codes)

Josephine(county)

Oregon(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Chrome Ridge(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 036S 009W 14 NEAR CENTER OF SW4 OF NE4 Oregon

Comments on the location information

  • LOCATION GIVEN IS FOR PGE SAMPLE SITE LOCATION. TOPO MAP SHOWS NO PROSPECTS IN AREA

Commodities

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

Materials information

Materials Type of material
Chromite Ore
Olivine Gangue

Alteration

  • (Local) Local Serpentinization

Analytical data

Result ORE CONCENTRATES TO A UNIFORM HIGH GRADE OF ABOUT 53% CR2O3, 14% FE
Result CONCENTRATES MADE FROM DISSEMINATED ORE CONTAIN 11.85% CR2O3. NOTE: 52.3% CR2O3, 17.6% FE, 1.3% SIO2, 13.0% MGO, 11.2% AL2O3. 2 PGE ANALYSES: PT=<10, 15 PPB
Result PD=<4, 9 PPB
Result IR=40 PPB (1 NOT ANALYZED)
Result RU=200 PPB (1 NOT ANALYZED)
Result RH=18, 19 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 Associated
    Rock type Plutonic Rock > Ultramafic Intrusive Rock > Peridotite
    Rock unit name Pearsoll Peak Ophiolite
    Rock description Pearsoll Peak Ophiolite
    Stratigraphic age (youngest) Late Jurassic
    Stratigraphic age (youngest) Late Jurassic
    Stratigraphic age (youngest) Late Jurassic
    Stratigraphic age (youngest) Late Jurassic
  • Host or associated Host
    Rock type Plutonic Rock > Ultramafic Intrusive Rock > Peridotite > Dunite
    Rock unit name Pearsoll Peak Ophiolite
    Rock description Pearsoll Peak Ophiolite

Nearby scientific data

(1) -123.72894, 42.44232
ListMap

Economic information

Geologic structures

Type of structure Local
Structure description Close To Axis Of Syncline

Ore body information

  • General form LAYERS OF DISSEMINATED ORE
    Strike N; N 10 E
    Dip 90; 85 E
    Width 4.57M
  • General form LAYERS OF DISSEMINATED ORE
    Strike N; N 10 E
    Dip 90; 85 E

Controls for ore emplacement

  • Magmatic Segreation

Economic information about the deposit and operations

Development status Producer
Commodity type Metallic
Deposit size Small
Significant No

Mining district

District name Chrome Ridge District

Land status

Ownership category National Forest
Area name Siskiyou National Forest

Production statistics

  • Year 1944
    Period 1942-1944
    Material ORE
    Accuracy Estimate
    Description Cp_Grade: ^39% Cr2o3, 2.4:1 Cr:Fe
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Cr2O3 Chromium Chromium 39wt-pct
  • Year 1955
    Period 1942-1955
    Material TOTAL
    Accuracy Estimate
    Description Cp_Grade: ^44.99% Cr2o3 (Weighted Average Grade)
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Cr2O3 Chromium Chromium 45wt-pct
  • Year 1955
    Period 1951-1955
    Material ORE
    Accuracy Estimate
    Description Cp_Grade: ^44-52% Cr2o3 (Conc.)
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Cr2O3 Chromium Chromium 48wt-pct

Comments on the production information

  • PRODUCTION LISTED FOR SORDY GROUP, MOST FROM VIOLET.

Comments on the reserve resource information

  • RESERVE ESTIMATES 4,000-5,000 TONS AT 30% CR203

Comments on the workings information

  • TWO SETS OF WORKINGS, UPPER (CAVED IN 1955) AND LOWER. UPPER IS 2 TUNNELS AND OPEN CUT, LOWER IS 2 TUNNELS AND GLORY HOLE. GLORY HOLE LOCATED NEAR AXIS OF SYNCLINE

Reference information

Bibliographic references

  • Deposit

    RAMP, LEN, 1961, CHROMITE IN SOUTHWESTERN OREGON: OREGON DEPARTMENT OF GEOLOGY AND MINERAL INDUSTRIES BULLETIN 52, P. 80-81.

  • Deposit

    WELLS, F.G., PAGE, L.R., AND JAMES, H.L., 1941, CHROMITE DEPOSITS IN THE SOURDOUGH AREA, CURRY COUNTY, AND THE BRIGGS CREEK AREA, JOSEPHINE COUNTY, OREGON: U.S. GEOLOGICAL SURVEY BULLETIN 922-P, PT. 4, P. 461-496.

  • 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

    OREGON DEPARTMENT OF GEOLOGY AND MINERAL INDUSTRIES, 1952, OREGON METAL MINES HANDBOOK, SOUTHWESTERN OREGON--JOSEPHINE COUNTY (2D ED.): OREGON DEPARTMENT OF GEOLOGY AND MINERAL INDUSTRIES BULLETIN 14-C, V. 2, SEC. 1, P. 145-146.

  • 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 OFFSET BY EN ECHELON FAULTS, FOLDED. GLORY HOLE DATA GIVEN

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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