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Ajax Mine

Past Producer in Grant 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. Links to other databases
  19. Bibliographic references
  20. General comments
  21. Reporter information

Geologic information

Identification information

Deposit ID 10033095
MRDS ID M015019
Record type Site
Current site name Ajax Mine
Related records 10298594

Geographic coordinates

Geographic coordinates: -118.75438, 44.35179 (WGS84)
Elevation 1609
Relative position ABOUT 10 MI FROM JOHN DAY AND PRAIRIE CITY

Site location context

Political divisions (FIPS codes)

Grant(county)

Oregon(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Pine Creek Mountain(quadrangle 1:24,000 scale)

John Day(quadrangle 1:100,000 scale)

Canyon City(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Upper John Day(hydrologic unit)

John Day(hydrologic accounting unit)

Middle Columbia(hydrologic subregion)

Pacific Northwest(hydrologic region)

Federal lands

Malheur National Forest(National Forest)

National Forest FS(Type of land area)

FS(Federal land areas administered by FS)

Strawberry Mountain Wilderness(Wilderness)

Wilderness FS(Type of land area)

FS(Federal land areas administered by FS)

Geographic areas

Country State County
United States Oregon Grant

Public Land Survey System information

Meridian Township Range Section Fraction State
Willamette 014S 033E 16 SE4 Oregon

Comments on the location information

  • NEAR CENTER OF SOUTH HALF OF SECTION ON WEST SIDE OF INDIAN CREEK ABOUT 1,000 FT ABOVE THE CREEK. 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

Alteration

  • (Local) Peridotite And Dunite Are Locally Serpentinized

Analytical data

Result 1 PGE ANALYSIS: PT=46 PPB
Result PD=21 PPB
Result IR=<20 PPB
Result RU=<100 PPB
Result RH=7 PPB. 35-41% CR2O3

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 Canyon Mountain Complex
    Rock description Canyon Mountain Complex
    Stratigraphic age (youngest) Late Permian
    Stratigraphic age (youngest) Late Permian

Nearby scientific data

(1) -118.75438, 44.35179
ListMap

Economic information

Geologic structures

Type of structure Local
Structure description Country Rock Is Highly Broken And Jointed

Ore body information

  • General form LENSES
    Strike N10E
    Dip STEEP NW
    Thickness 0.91M
    Length 4.57M
    Width 3.66M

Controls for ore emplacement

  • En Echelon In Narrow Dunite Zone In Peridotite.

Comments on the geologic information

  • PERIDOTITE IS PORPHYRITIC AWAY FROM ORE ZONE. LONG AXES OF LENSES PARALLEL DUNITE CONTACTS. SPOTTED ORE FINGERS OUT INTO DUNITE IN SERIES OF IRREGULAR CONES EXTENDING PARALLEL TO LINEAR BANDING, WHICH TRENDS N80E AND PITCHES 50E.

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic
Deposit size Small
Significant No

Mining district

District name Canyon City District

Land status

Ownership category National Forest
Area name Malheur Natioal Forest

Comments on the production information

  • 25 TONS WERE REMOVED FROM A CUT 25 X 5 X 5 FT

Comments on the workings information

  • 3 OPEN CUTS OVER 140 FT DISTANCE, EACH ABOUT 25 FT LONG AND 40 FT APART

Reference information

Bibliographic references

  • Deposit

    ALLEN, J.E., 1941, CHROMITE DEPOSITS OF OREGON (REVISED ED.): OREGON DEPARTMENT OF GEOLOGY AND MINERAL INDUSTRIES BULLETIN 9, P. 65.

  • Deposit

    OREGON DEPARTMENT OF GEOLOGY AND MINERAL INDUSTRIES, 1941, OREGON METAL MINES HANDBOOK, NORTHEASTERN OREGON - WEST HALF: OREGON DEPARTMENT OF GEOLOGY AND MINERAL INDUSTRIES BULLETIN 14-B, P. 19.

  • 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

    THAYER, T.P., 1940, CHROMITE DEPOSITS OF GRANT COUNTY, OREGON: U.S. GEOLOGICAL SURVEY BULLETIN 922-D, P. 103.

General comments

Subject category Comment text
Deposit STRIKE IS FOR ORE ZONE; INDIVIDUAL EN ECHELON ORE BODIES STRIKE N50-60E. DIP IS FOR INDIVIDUAL ORE BODIES. ORE FORMS LOW-GRADE DISSEMINATED KIDNEYS. ORE HAS A CONSPICUOUS LINEAR BANDING FROM ELONGATION OF CHROMITE NODULES.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-JUN-1976 Lee, W. U.S. Geological Survey
Updater 01-JAN-1980 Bradley, Robin (Walker, George W.) U.S. Geological Survey
Updater 01-AUG-1984 Ferns, Mark L. (Brooks, Howard C.) Oregon Department of Geology and Mineral Industries
Updater 01-MAR-1990 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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