The Bluff is a zinc and lead 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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Bluff MRDS details
Site Name
Primary: Bluff
Commodity
Primary: Zinc
Primary: Lead
Location
State: Alaska
District: Fortymile
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: Strong hydrothermal alteration (Singer and others, 1976).
Rocks
Not available
Analytical Data
Not available
Materials
Ore: Sphalerite
Ore: Chalcopyrite
Ore: Galena
Ore: Magnetite
Ore: Molybdenite
Ore: Pyrite
Gangue: Tourmaline
Comments
Comment (Deposit): Model Name = Porphyry Cu (Cox and Singer, 1986; model 21a)
Comment (Geology): Age = Mid-Cretaceous to early Tertiary, based on other deposits in the area (Mosquito: TC015).
Comment (Reference): Primary Reference = Eberlein and others, 1977
Comment (Deposit): Other Comments = See also Mosquito (TC015) and Peternie (TC022) prospects.
Comment (Geology): Geologic Description = The Bluff prospect contains disseminated pyrite, chalcopyrite, molybdenite, tourmaline, and magnetite within high-level porphyritic quartz monzonite and granodiorite intrusions. The intrusions are of mid-Cretaceous to early Tertiary age (Foster, 1970). The intrusions also show evidence of strong hydrothermal alteration. Numerous faults and dikes are found in the area (Singer and others, 1976). The prospect was explored by surface sampling, diamond drilling, and geophysics in the early 1970's by Cities Services Mineral Corp. (David Hedderly-Smith, oral communication, 1998). The regional geology of the prospect consists of Precambrian-Paleozoic biotite gneiss and schist of amphibolite grade (Foster, 1970). The prospect also lies within the eastern portion of the Y1 subterrane of the Yukon-Tanana terrane (Foster and others, 1994).
Comment (Workings): Workings / Exploration = Explored by surface sampling, diamond drilling, and geophysics by Cities Services Mineral Corp. in the early 1970's (Singer and others, 1976). There has probably been more exploration in recent years. The Bluff prospect was also staked in 1987 by Resource Associates of Alaska, but was dropped two years later.
References
Reference (Deposit): Foster, H.L., and Keith, T.E.C., 1994, Geology of the Yukon-Tanana area of east-central Alaska: in Plafker, G. and Berg, H.C., eds, The geology of North America, vol. G-1, The geology of Alaska: Geological Society of America, p. 205-240.
Reference (Deposit): Cobb, E.H., and Eberlein, G.D., 1980, Summaries of data on and lists of references to metallic and selected nonmetallic mineral deposits in the Big Delta and Tanacross quadrangles, Alaska: U.S. Geological Survey Open-File Report 80-1086, 77 p.
Reference (Deposit): Singer, D.A., Csejtey, Bela, Jr., and Miller, R.J., 1978, Map and discussion of the metalliferous and selected nonmetalliferous mineral resources of the Talkeetna Mountains quadrangle, Alaska: U.S. Geological Survey Open-file Report 78-588-Q, 33 p., 1 plate, scale 1:250,000.
Reference (Deposit): Nokleberg, W.J., Bundtzen, T.K., Berg, H.C., Brew, D.A., Grybeck, D.J., Robinson, M.S., Smith, T.E., and Yeend, W., 1987, Significant metalliferous lode deposits and placer districts of Alaska: U.S. Geological Survey Bulletin 1786, 104 p.
Reference (Deposit): Foster, H.L., 1970, Reconnaissance geologic map of the Tanacross quadrangle, Alaska: U.S. Geological Survey Miscellaneous Geological Investigations Map I-593, 1 sheet, scale 1:250,000.
Reference (Deposit): Eberlein, G.D., Chapman, R.M., Foster, H.L., and Gassaway, J.S., 1977, Map and table describing known metalliferous and selected nonmetalliferous mineral deposits in central Alaska: U.S. Geological Survey Open-File Report 77-168-D, 132 p., 1 map, scale 1:1,000,000.
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