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Seiad Creek

Past Producer in Siskiyou county in California, 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. Land status
  17. Ownership information
  18. Reserves and resources
  19. Workings at the site
  20. Links to other databases
  21. Bibliographic references
  22. General comments
  23. Reporter information

Geologic information

Identification information

Deposit ID 10077720
MRDS ID W025614
Record type Site
Current site name Seiad Creek
Alternate or previous names Mountain View, Reddy No. 2, Teddy Chrome, Red Hills, Valley View

Geographic coordinates

Geographic coordinates: -123.14392, 41.90955 (WGS84)
Elevation 1013
Relative position 7 MI NORTH OF SEIAD VALLEY

Site location context

Political divisions (FIPS codes)

Siskiyou(county)

California(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Kangaroo Mountain(quadrangle 1:24,000 scale)

Happy Camp(quadrangle 1:100,000 scale)

Weed(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Upper Klamath(hydrologic unit)

Klamath(hydrologic accounting unit)

Klamath-Northern California Coastal(hydrologic subregion)

California(hydrologic region)

Federal lands

Klamath National Forest(National Forest)

National Forest FS(Type of land area)

FS(Federal land areas administered by FS)

Geographic areas

Country State County
United States California Siskiyou

Public Land Survey System information

Meridian Township Range Section Fraction State
Mount Diablo 047N 011W 20 California

Comments on the location information

  • UNSURVEYED. IN KLAMATH NATIONAL FOREST. BETWEEN FORKS IN SEIAD CREEK

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
Anthophyllite Gangue
Chlorite Gangue
Magnesite Gangue
Talc Gangue
Tremolite Gangue
Uvarovite Gangue

Alteration

  • (Local) Dunite Is Partly Serpentinized

Analytical data

Result 7 PGE ANALYSES: PT=<1-120 PPB
Result PD=<1-34 PPB
Result IR=20 PPB
Result RU=100-200 PPB
Result RH=6-22 PPB. CR:FE=2.2-2.43:1

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 Seiad Valley Complex
    Rock description Seiad Valley Complex
    Stratigraphic age (youngest) Late Triassic
    Stratigraphic age (youngest) Late Triassic
    Stratigraphic age (youngest) Late Triassic
  • Host or associated Host
    Rock type Plutonic Rock > Ultramafic Intrusive Rock > Peridotite > Dunite

Nearby scientific data

(1) -123.14392, 41.90955
ListMap

Economic information

Geologic structures

Type of structure Local
Structure description 3 Sets Of Complex Faults And Joints With Little Displacement

Ore body information

  • General form MASSIVE LENSES AND STREAKS, DISSEMINATED
    Strike N30-60W
    Dip 30-60NE
    Plunge 10
    Plunge direction SE
    Length 396.24M
    Width 11.89M

Controls for ore emplacement

  • Magmatic Segregation

Comments on the geologic information

  • DUNITE IS COMPOSED OF 95% OLIVINE AND 5% ENSTATITE. COUNTRY ROCK IS SCHISTOSE AND DUNITE IS FOLIATED.

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic
Deposit size Small
Significant No
Discovery year 1915
Year of first production 1914
Year of last production 1945

Land status

Ownership category National Forest

Ownership information

  • Type Operator
    Owner Kangaroo Mountain Chrome Co.
    First year 1944
  • Type Owner
    Owner Rustless Mining Co.
    First year 1944

Reserves and resources

  • Type In-situ
    Estimate year 1941
    Total resources 120000mt ore
    Commodity Subtype Grade units Group Importance Year
    Chromium Cr2O3 6 wt-pct Chromium Major 1941
  • Type In-situ
    Estimate year 1941
    Total resources 27000mt ore
    Commodity Subtype Grade units Group Importance Year
    Chromium Cr2O3 15 wt-pct Chromium Major 1941

Workings at the site

  • Type of workings Surface/Underground
    Length 359.66M

Comments on the workings information

  • 2 ADITS, NUMEROUS TRENCHES, 30 DIAMOND DRILL HOLES

Comments on development

  • MINE WAS IDLE BETWEEN WWI AND WWII

Reference information

Bibliographic references

  • Deposit

    WELLS, F.G., AND CATER, F.W., JR., 1950, GEOLOGICAL INVESTIGATIONS OF CHROMITE IN CALIFORNIA: CALIFORNIA DIVISION OF MINES BULLETIN 134, PT. 1, CH. 2, P. 118.

  • 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.

  • Deposit

    WELLS, F.G., SMITH, C.T., RYNEARSON, G.H., AND LIVERMORE, J.S., 1949, CHROMITE DEPOSITS NEAR SEIAD AND MCGUFFY CREEKS, SISKIYOU COUNTY, CALIFORNIA: U.S. GEOLOGICAL SURVEY BULLETIN 948-B, P. 48-52.

  • Deposit

    WEIBELT, F.J., AND RICKER, SPANGLER, 1949, INVESTIGATION OF THE SEIAD CREEK CHROMITE DEPOSITS, SISKIYOU COUNTY, CALIF.: U.S. BUREAU OF MINES REPORT OF INVESTIGATIONS 4619, 28 P.

General comments

Subject category Comment text
Deposit MASSIVE ORE HAS BEEN MINED OUT. ORE OCCURRED IN 3 MAIN ZONES
Deposit RECORD W017822 HAS BEEN MERGED AND DELETED.
Deposit Discovery Year: WWI

Reporter information

Type Date Name Affiliation Comment
Reporter 01-FEB-1990 Peterson, Jocelyn A. U.S. Geological Survey

Beyond USGS

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

Maps centered on this site

Authoritative California resources

These are landing pages for further research — the state agencies don't currently expose per-mine deep links.