Shamrock

Occurrence in Jackson county in Oregon, United States with commodities Copper, Nickel, Cobalt, Platinum
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. Ore body information
  13. Controls for ore emplacement
  14. Economic information about the deposit and operations
  15. Land status
  16. Ownership information
  17. Workings at the site
  18. Links to other databases
  19. Bibliographic references
  20. General comments
  21. Reporter information

Geologic information

Identification information

Deposit ID 10042983
MRDS ID M061386
Record type Site
Current site name Shamrock
Alternate or previous names Chisholm Copper
Related records 10249569

Geographic coordinates

Geographic coordinates: -122.97697, 42.60121 (WGS84)
Elevation 549
Relative position 8 MI WEST OF SHADY COVE

Site location context

Political divisions (FIPS codes)

Jackson(county)

Oregon(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Boswell Mountain(quadrangle 1:24,000 scale)

Crater Lake(quadrangle 1:100,000 scale)

Medford(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Middle Rogue(hydrologic unit)

Southern Oregon Coastal(hydrologic accounting unit)

Oregon-Washington Coastal(hydrologic subregion)

Pacific Northwest(hydrologic region)

Federal lands

Bureau of Land Management(Bureau of Land Management OR)

Bureau of Land Management OR BLM(Type of land area)

BLM(Federal land areas administered by BLM)

Geographic areas

Country State County
United States Oregon Jackson

Public Land Survey System information

Meridian Township Range Section Fraction State
Willamette 034S 002W 19,20 CENTER OF E4 (19) Oregon

Comments on the location information

  • ON STEEP HILL ABOVE EAST SIDE OF EVANS CREEK. LOCATION GIVEN IS PROSPECT SYMBOL SHOWN ON TOPO MAP

Commodities

Commodity Importance
Copper Primary
Nickel Critical Primary
Cobalt Critical Tertiary
Platinum Critical Tertiary

Comments on the commodity information

  • CHALCOPYRITE AND PENTLANDITE ARE INTIMATELY ASSOCIATED IN MINUTE VEINLETS THEREBY CREATING PROBLEMS IN SEPARATING CU FROM NI. USBM STUDIES CONCLUDE THAT BULK SAMPLE OF FLOTATION WOULD WORK AS FIRST STEP; ORE NEVER MINED. COBALT MINERAL WAS NOT IDENTIFIED

Materials information

Materials Type of material
Chalcopyrite Ore
Pentlandite Ore
Calcite Gangue
Graphite Gangue
Zoisite Gangue

Alteration

  • (Local) Sericite, Leaching On Intermediate Level, Serpentinite

Analytical data

Result APPROX. AVERAGE GRADE REPORTED FROM A 10-KG USBM SAMPLE OF REPRESENTATIVE ORE CONTAINS 1.3% NI, 1.1% CU, 0.07% CO, AND 0.03 OZ/TON PT. USBM SAMPLE (SHELTON) GAVE 2.2% NI, 0.78% CU, 0.01% CO. 660 PPB PD, 23 PPB PT, 48 PPB RH IN SULFIDE-RICH SAMPLE. SAMPLE OF CLAY GOUGE YIELDED 310 PPB AU, 616 PPB AG, 6.81 PPM BI, 240 PPM CO, 2000 PPM CR, 6524 PPM CU, 9.45 PPM MO, 4760 PPM NI, 9.5 PPM SE, 1.7 PPM TE, 370 PPM ZN (WILEY AND HLADKY, 1991)

Mineral occurrence model information

Model code 13
USGS model code 7a
Deposit model name Synorogenic-synvolcanic Ni-Cu
Mark3 model number 19

Host and associated rocks

  • Host or associated Host
    Rock type Metamorphic Rock > Schist > Mica Schist
    Rock unit name May Creek Schist;
    Rock description May Creek Schist;

Nearby scientific data

(1) -122.97697, 42.60121

Economic information

Ore body information

  • General form DISSEMINATED, BLEBS, VEINLETS, MASSES
    Strike N60E
    Dip 55SE
    Length 30.48M
    Width 7.62M
    Depth to bottom 30.48M

Controls for ore emplacement

  • Strongest Mineralization In Norite; Weakly Disseminated In Schist

Comments on the geologic information

  • ULTRAMAFIC SILLS IN SCHISTOSE ALTERED GREENSTONE CONTAINS ORE, AS DISSEMINATIONS, SMALL VEINLETS, AND SOLID MASSES. ORE ZONE BADLY CUT UP BY THRUST FAULTS. OTHER ROCKS PRESENT IN AREA INCLUDE SERPENTINIZED PERIDOTITE, HORNBLENDE-QUARTZ DIORITE, GRANODIORITE, AND PEGMATITE. TWO GENERATIONS OF SULFIDES HAVE BEEN IDENTIFIED.

Economic information about the deposit and operations

Development status Occurrence
Commodity type Metallic
Deposit size Small
Significant No
Discovery year 1900
Discoverer W.P. Chisholm

Land status

Ownership category Private

Ownership information

  • Type Operator
    Owner Freeport And Boise Cascade
    First year 1988

Comments on the reserve resource information

  • RESERVES UNKNOWN

Workings at the site

  • Type of workings Surface/Underground
    Length 457.2M
    Overall length 502.92M

Comments on the workings information

  • FOUR ADITS; DIAMOND DRILLING IN 11 DRILL HOLES. ALSO INCLINED SHAFT AND TRENCHES

Comments on development

  • EXPLORATION PROGRAM IN 1988

Reference information

Bibliographic references

  • Deposit

    HUNDHAUSEN, R.J., 1952, INVESTIGATION OF SHAMROCK COPPER-NICKEL MINE, JACKSON COUNTY, OREGON: U.S. BUREAU OF MINES REPORT OF INVESTIGATIONS 4895, P. 1-8.

  • Deposit

    SHELTON, J.E., 1956, BENEFICIATION STUDIES OF NICKELIFEROUS ORES FROM THE SHAMROCK MINE, JACKSON COUNTY, OREG., AND THE CONGRESS MINE, FERRY COUNTY, WASH.: U.S. BUREAU OF MINES REPORT OF INVESTIGATIONS 5261, P. 6-8.

  • Deposit

    RAMP, LEN, 1978, INVESTIGATIONS OF NICKEL IN OREGON: OREGON DEPARTMENT OF GEOLOGY AND MINERAL INDUSTRIES MISCELLANEOUS PAPER NO. 20, P. 7, 57-58.

  • Deposit

    ASHLEY, R.P., AND PETERSON, J.A., 1991, U.S. GEOLOGICAL SURVEY, FIELD EXAM.

  • Deposit

    FERNS, M.L., 1989, MINING ACTIVITY AND EXPLORATION IN OREGON, 1988: OREGON GEOLOGY, V. 51, NO. 2, P. 29.

  • Deposit

    WILEY, T.J., AND HLADKY, F.R., 1991, GEOLOGY AND MINERAL RESOURCES MAP OF THE BOSWELL MOUNTAIN QUADRANGLE, JACKSON COUNTY, OREGON: OREGON DEPARTMENT OF GEOLOGY AND MINERAL INDUSTRIES GEOLOGICAL MAP SERIES GMS-70, SCALE 1:24,000.

  • Deposit

    1949 DIREXPL HUNDHAUSEN, USB

General comments

Subject category Comment text
Deposit TWO ORE BODIES; MINE ORE BODY (DATA ABOVE) AND SURFACE ORE BODY (200 X 200 X 38 FT). ORE BODY TERMINATED AT EITHER END BY FAULTS

Reporter information

Type Date Name Affiliation Comment
Reporter 01-MAY-1976 Johnson, Maureen G. U.S. Geological Survey
Updater 01-APR-1979 Bradley, Robin (Walker, George W.) U.S. Geological Survey
Updater 01-JUL-1991 Peterson, Jocelyn A. U.S. Geological Survey

Beyond USGS

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