Poovookpuk Mountain

The Poovookpuk Mountain is a molybdenum and 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: Poovookpuk Mountain

Commodity

Primary: Molybdenum
Primary: Copper

Location

State: Alaska
District: Bering Sea

Land Status

Not available

Holdings

Not available

Workings

Not available

Ownership

Not available

Production

Not available

Deposit

Record Type: Site
Operation Category: Prospect
Operation Type: Unknown
Years of Production:
Organization:
Significant:

Physiography

Not available

Mineral Deposit Model

Model Name: Porphyry Cu-Mo

Orebody

Not available

Structure

Not available

Alterations

Alteration Type: L
Alteration Text: Alteration of the quartz monzonite porphyry has not been described but is probably present. The nearby volcanic rocks are probably also altered in addition to being pyritized.

Rocks

Name: Quartz Monzonite
Role: Host
Age Type: Host Rock
Age Young: Late Cretaceous

Analytical Data

Not available

Materials

Ore: Chalcopyrite
Ore: Malachite
Ore: Molybdenite
Gangue: Pyrite

Comments

Comment (Deposit): Model Name = Fracture fillings, veins, and disseminations of chalcopyrite and molybdenite in granitic rock. Deposit model 21a (?); porphyry Cu-Mo

Comment (Geology): Geologic Description = A stock of quartz monzonite porphyry, 1/2 mile across, intrudes Cretaceous volcanic rocks and contains disseminated chalcopyrite, malachite, pyrite and minor molybdenite (Patton and Csejtey, 1971, p. C13). A grab sample contained 3,000 ppm copper but the molybdenum concentration in this sample was below detection (Patton and Csejtey, 1971, p. C8). Composite chip samples collected across the stock contained 700 ppm copper or less (Patton and Csejtey, 1971, p. C13). The Cretaceous volcanic rocks peripheral to the stock are heavily pyritized and extensively oxidized. The only sulfide mineral identified in the volcanic rocks is pyrite but a grab sample of massive pyritized rock contained 1,500 ppm copper, 10 ppm silver, and 30 ppm molybdenum. Fourteen stream sediment samples collected over about 1.5 miles of the nearby headwater drainages (Patton and Csejtey, 1972) contained anomalous to highly anomalous concentrations of copper (to 1,500 ppm), molybdenum (to 70 ppm), and silver (to 1.5 ppm). Alteration of the quartz monzonite porphyry has not been described but is probably present. The nearby volcanic rocks are probably also altered in addition to being pyritized.

Comment (Exploration): Status = Inactive

Comment (Workings): Workings / Exploration = A grab sample contained 3,000 ppm copper but the molybdenum concentration in this sample was below detection (Patton and Csejtey, 1971, p. C8). Composite chip samples collected across the stock contained 700 ppm copper or less (Patton and Csejtey, 1971, p. C13). The only sulfide mineral identified in the volcanic rocks is pyrite but a grab sample of massive pyritized rock contained 1,500 ppm copper, 10 ppm silver, and 30 ppm molybdenum. Fourteen stream sediment samples collected over about 1.5 miles of the nearby headwater drainages (Patton and Csejtey, 1972) contained anomalous to highly anomalous concentrations of copper (to 1,500 ppm), molybdenum (to 70 ppm), and silver (to 1.5 ppm).

Comment (Reference): Primary Reference = Patton and Csejtey, 1971 (PP 684-C)

Comment (Geology): Age = Mid-Cretaceous, the age of K/Ar dated intrusive and volcanic rocks on western St. Lawrence Island (Patton and Csejtey, 1980).

References

Reference (Deposit): Patton, W.W., Jr., and Csejtey, Bela, Jr., 1980, Geologic map of St. Lawrence Island, Alaska: U.S. Geological Survey Miscellaneous Investigation Series Map I-1203, scale 1:250,000.

Reference (Deposit): Cobb, E.H., 1980, Summaries of data and lists of references to metallic and selected nonmetallic mineral deposits in fifteen quadrangles in southwestern and west-central Alaska: U.S. Geological Survey Open-File Report 80-909, 103 p.

Reference (Deposit): Cobb, E.H., 1972, Metallic mineral resources map of the Saint Lawrence quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-465, 1 sheet, scale 1:250,000.

Reference (Deposit): Patton, W.W., Jr., and Csejtey, Bela, Jr., 1971, Preliminary geologic investigations of western St. Lawrence Island, Alaska: U.S. Geological Survey Professional Paper 684-C, p. C1-C15.

Reference (Deposit): Patton, W.W., Jr., and Csejtey, Bela, Jr., 1972, Analyses of stream sediment and rock samples from St. Lawrence Island, Alaska, 1966-1971: U.S. Geological Survey Open-File Report 72-293, 78 p.

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