Shamrock

The Shamrock is a copper and nickel mine located in Jackson county, Oregon at an elevation of 1,801 feet.

About the MRDS Data:

All mine locations were obtained from the USGS Mineral Resources Data System. The locations and other information in this database have not been verified for accuracy. It should be assumed that all mines are on private property.

Mine Info

Name: Shamrock  

State:  Oregon

County:  Jackson

Elevation: 1,801 Feet (549 Meters)

Commodity: Copper, Nickel

Lat, Long: 42.60139, -122.97583

Map: View on Google Maps

Satelite View

MRDS mine locations are often very general, and in some cases are incorrect. Some mine remains have been covered or removed by modern industrial activity or by development of things like housing. The satellite view offers a quick glimpse as to whether the MRDS location corresponds to visible mine remains.


Satelite image of the Shamrock

Shamrock MRDS details

Site Name

Primary: Shamrock
Secondary: Chisholm Copper


Commodity

Primary: Copper
Primary: Nickel
Tertiary: Cobalt
Tertiary: Platinum


Location

State: Oregon
County: Jackson


Land Status

Land ownership: Private
Note: the land ownership field only identifies whether the area the mine is in is generally on public lands like Forest Service or BLM land, or if it is in an area that is generally private property. It does not definitively identify property status, nor does it indicate claim status or whether an area is open to prospecting. Always respect private property.


Holdings

Not available


Workings

Type: Surface/Underground


Ownership

Owner Name: Freeport And Boise Cascade
Years: 1988 -


Production

Not available


Deposit

Record Type: Site
Operation Category: Occurrence
Operation Type: Unknown
Discovery Year: 1900
Years of Production:
Organization:
Significant: N
Deposit Size: S


Physiography

General Physiographic Area: Pacific Mountain System
Physiographic Province: Pacific Border Province
Physiographic Section: Klamath Mountains


Mineral Deposit Model

Model Name: Synorogenic-synvolcanic Ni-Cu


Orebody

Form: DISSEMINATED, BLEBS, VEINLETS, MASSES


Structure

Not available


Alterations

Alteration Type: L
Alteration Text: Sericite, Leaching On Intermediate Level, Serpentinite


Rocks

Not available


Analytical Data

Analytical Data: 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)


Materials

Ore: Chalcopyrite
Ore: Pentlandite
Gangue: Graphite
Gangue: Calcite
Gangue: Zoisite


Comments

Comment (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

Comment (Workings): FOUR ADITS; DIAMOND DRILLING IN 11 DRILL HOLES. ALSO INCLINED SHAFT AND TRENCHES

Comment (Geology): 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.

Comment (Location): ON STEEP HILL ABOVE EAST SIDE OF EVANS CREEK. LOCATION GIVEN IS PROSPECT SYMBOL SHOWN ON TOPO MAP

Comment (Reserve-Resource): RESERVES UNKNOWN

Comment (Development): EXPLORATION PROGRAM IN 1988

Comment (Commodity): 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


References

Reference (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.

Reference (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.

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

Reference (Deposit): ASHLEY, R.P., AND PETERSON, J.A., 1991, U.S. GEOLOGICAL SURVEY, FIELD EXAM.

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

Reference (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.

Reference (Deposit): 1949 DIREXPL HUNDHAUSEN, USB


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