The Duke Island Ultramafic Complex is a iron mine located in Alaska.
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
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Duke Island Ultramafic Complex MRDS details
Site Name
Primary: Duke Island Ultramafic Complex
Secondary: Ditto ? Prospect
Commodity
Primary: Iron
Secondary: Chromium
Tertiary: Platinum
Tertiary: Nickel
Tertiary: Copper
Location
State: Alaska
District: Ketchikan
Land Status
Not available
Holdings
Not available
Workings
Not available
Ownership
Not available
Production
Not available
Deposit
Record Type: Site
Operation Category: Occurrence
Operation Type: Unknown
Years of Production:
Organization:
Significant: N
Deposit Size: S
Physiography
Not available
Mineral Deposit Model
Not available
Orebody
Not available
Structure
Not available
Alterations
Not available
Rocks
Not available
Analytical Data
Not available
Materials
Ore: Chromite
Gangue: Pyrrhotite
Gangue: Pyrite
Unknown: Chalcopyrite
Unknown: Pentlandite
Comments
Comment (Commodity): ANALYSIS OF 22 SAMPLES: AVE. CONCENTRATIONS OF 0.037 PPM PT IN 10 SAMPLES, 0.033 PPM PD IN 16 SAMPLES, 0.010 PPM RH IN 6 SAMPLES, AND NO IR, USGS PP 800-C, P. C159
Comment (Location): PROSPECT IN AREA OF WIDESPREAD IRON MINERALIZATION IN LARGE ULTRAMAFIC COMPLEX, USGS OFR 78-73B, LOCS. 159-174; SEPARATE ENTRIES FOR EACH LOCATION LAND STATUS VALUE CALCULATED 6-94 USING GIS OVERLAY ANALYSIS WITH BLM 1:2,500,000 SCALE OWNERSHIP STATUS MAP (1991).
Comment (Development): DIAMOND DRILLED BY PRIVATE MINING INTERESTS; DETAILED GEOLOGICAL , GEOPHYSICAL AND GEOCHEMICAL WORK HAS BEEN DONE
Comment (Workings): DRILLED BY PRIVATE INTERESTS; NO EXTENSIVE DEVELOPMENT
Comment (Reserve-Resource): "AT LEAST ONE POTENTIALLY SIGNIFICANT DEPOSIT OF TITANIFEROUS MAGNETITE OCCURS IN THE PYROXENITE ZONE OF THE DUKE ISLAND ULTRAMAFIC COMPLEX," USGS OFR 78-73M, P. 27
Comment (Geology): HORNBLENDE PYROXENITE FORMS PARTIAL TO COMPLETE ENVELOPES AROUND UM BODIES COMPOSED OF GRADED LAYERS OF OLIVINE PYROXENITE AND DUNITE INTRUDED INTO LARGE MASS OF GABBRO; GRADED LAYERING OF PYROXENE AND TITANIFEROUS MAGNETITE OCCURS LOCALLY IN HORNBLENDE PYROXENITE; GABBRO IS ALTERED TO HORNBLENDE GABBRO NEAR CONTACTS WITH ULTRAMAFIC MASSES; LARGER BODIES ARE CONCENTRICALLY ZONED FROM DUNITE CORE TO PYROXENITE RIM
Comment (Deposit): DATA APPLIES TO DEPOSIT NOS. PR-159 THROUGH PR-174; NUMEROUS PROSPECTS ABOUT WHICH LITTLE IS KNOWN OTHER THAN COMMODITY (FE OR CR) AND LOCATION; IT IS ASSUMED THAT THEY ARE RELATED TO THE ULTRAMAFIC BODIES THAT ARE KNOWN TO OCCUR ON DUKE ISLAND ; INFO.SRC : 1 PUB LIT; 2 UNPUB REPT
Comment (Deposit): TITANIFEROUS MAGNETITE DISSEMINATED IN RHYTHMICALLY LAYERED HORNBLENDE PYROXENITE; RARE SPECKS OF PYRRHOTITE, PYRITE, PENTLANDITE AND CHALCOPYRITE WIDELY DISSEMINATED IN HORNBLENDE PYROXENITE; CHROMITE OCCURS IN DUNITE AND PERIDOTITE AS DISSEMINATED EUHEDRA AND GRAINS AND AS SMALL MASSIVE VEINS AND CLOTS
References
Reference (Deposit): USGS OFR 78-73B, LOC. 166
Reference (Deposit): IRVINE, T.N., 1959, THE ULTRAMAFIC COMPLEX AND RELATED ROCKS OF DUKE ISLAND, SOUTHEASTERN ALASKA: CALIFORNIA INSTITUTE OF TECHNOLOGY, PASADENA, PH.D. THESIS
Reference (Deposit): TAYLOR, H.P. AND NOBLE, J.A., 1960, ORIGIN OF THE ULTRAMAFIC COMPLEXES IN SOUTHEASTERN ALASKA: INTERNAT. GEOL. CONG., 21ST, COPENHAGEN, REPT., PT. 13, P. 178-180
Reference (Deposit): USGS OFR 78-73M, P. 24-25, 27
Reference (Deposit): USGS PP 800-C, P. C159
Reference (Deposit): USGS BULL 1246, P. 183
Reference (Other Database): BAG-OFR-78-73B-166
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