Unnamed (on Cape Kumlik)

The Unnamed (on Cape Kumlik) is a copper 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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Site Name

Primary: Unnamed (on Cape Kumlik)

Commodity

Primary: Copper
Secondary: Gold
Secondary: Silver
Secondary: Molybdenum

Location

State: Alaska
District: Alaska Peninsula

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:

Physiography

Not available

Mineral Deposit Model

Model Name: Porphyry Cu

Orebody

Not available

Structure

Not available

Alterations

Alteration Type: L
Alteration Text: The rocks exhibit a zoned alteration pattern, with a central potassic core grading outward to quartz-sericite and silicification, and to peripheral propylitization.

Rocks

Name: Tonalite
Role: Associated
Age Type: Associated Rock
Age Young: Pliocene

Analytical Data

Not available

Materials

Ore: Chalcopyrite
Ore: Molybdenite
Ore: Pyrite
Gangue: Barite
Gangue: Quartz

Comments

Comment (Exploration): Status = Inactive

Comment (Deposit): Other Comments = This site is located on land selected by the Koniag Native Corporation.

Comment (Deposit): Model Name = Porphyry copper (Cox and Singer, 1986, model 17)

Comment (Workings): Workings / Exploration = Resource Associates of Alaska did a stream-sediment geochemical survey in 1975 (Hedderly-Smith, 1977). Bear Creek Mining Company geochemically sampled and mapped the occurrence in 1977 (Hedderly-Smith, 1977). Most samples returned copper values in the 400 to 1000 ppm range. One sample of mineralized intrusive contained 5600 ppm copper. Low order molybdenum and silver anomalies were also detected. The U.S. Geological Survey (Yount and others, 1978) took 7 samples in 1978. The highest copper value obtained was 2200 ppm.

Comment (Reference): Primary Reference = Hedderly-Smith, 1977

Comment (Reserve-Resource): Reserves = This occurrence is estimated to have a small tonnage of low grade (Cox and others, 1981).

Comment (Geology): Age = Tertiary.

Comment (Geology): Geologic Description = At this site a quartz diorite stock has intruded volcanic rocks of the Oligocene and Eocene Meshik Formation (Detterman and others, 1981). The occurrence is marked by a large color anomaly covering about 1 section. Chalcopyrite and pyrite occur in quartz(?) veinlets and as disseminations in both the intrusive and in the surrounding volcanic rocks (Hedderly-Smith, 1977). Barite has been noted in many stream-sediment samples.? Numerous rock-chip samples collected by Bear Creek Mining Company returned copper values in the 400 ppm to 1000 ppm range and several contained 1000 ppm to 2000 ppm copper (Hedderly-Smith, 1977). The highest value was 5600 ppm copper from a sample of the mineralized intrusive. Molybdenum and silver were indicated as low-order anomalies. Gold was detected in the 0.07ppm 0.31 ppm range. The higher gold values generally coincided with the higher copper values. Of 7 rock samples collected here in 1978 by the U.S. Geological Survey, only 1 contained strongly anomalous values in copper (2200 ppm) (Yount and others, 1978). Cox and others (1981) estimate a small tonnage of low grade mineralization.? the rocks at the center of the mineralized area exhibit potassic alteration (Hedderly-Smith, 1977). Quartz-sericite alteration and silicification occur to the east, south, and west of the central area in both intrusive and volcanic rocks. An outer zone of propylitization is present.

References

Reference (Deposit): Yount, M.E., Cooley, E.F., and O'Leary, R.M., 1978, Sample location map, analytical data, and statistical summary of analyses of rock samples, Chignik and Sutwik Island quadrangles, Alaska: U.S. Geological Survey Open-File Report 78-557, l sheet, scale l:250,000.

Reference (Deposit): Cox, D.P., Detra, D.E., and Detterman, R.L., 1981, Mineral resource maps of the Chignik and Sutwik Island quadrangles, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF- 1053-K, 2 map sheets, scale 1:250,000.

Reference (Deposit): MacKevett, E.M., Jr., and Holloway, C.D., 1977, Map showing metalliferous mineral deposits in the western part of southern Alaska: U.S. Geological Survey Open-File Report 77-169-F, 38 p., 1 sheet, scale 1:1,000,000.

Reference (Deposit): Detterman, R.L., Miller, T.P., Yount, M.E., and Wilson, F.H.,1981, Geologic map the Chignik and Sutwik Island quadrangles Alaska: U.S. Geologic Survey Miscellaneous Investigations Series Map I- 1229, 1 map sheet, scale 1:250,000.

Reference (Deposit): Hedderly-Smith, D.A., 1977 Annual report, Alaska search, Koniag Inc. region: Bear Creek Mining Company, Spokane Office, 23 p. (Report held by Kennecott Alaska, Anchorage).

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