The Unnamed (on Butterworth Island) is a zinc, lead, and silver 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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Unnamed (on Butterworth Island) MRDS details
Site Name
Primary: Unnamed (on Butterworth Island)
Commodity
Primary: Zinc
Primary: Lead
Primary: Silver
Location
State: Alaska
District: Kupreanof
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: Massive sulfide, kuroko
Model Name: Massive sulfide, Sierran kuroko
Orebody
Not available
Structure
Not available
Alterations
Not available
Rocks
Not available
Analytical Data
Not available
Materials
Ore: Sphalerite
Ore: Pyrite
Ore: Galena
Comments
Comment (Geology): Age = Probably Triassic based on analogy with other volcanogenic massive sulfide deposits in the area.
Comment (Production): Production Notes = None
Comment (Reference): Primary Reference = This description
Comment (Workings): Workings / Exploration = Has been known since at least the late 1970's and has been examined and sampled by a succession of companies. Houston Oil and Minerals documented their 1980 work at the site with their annual report of assessment on the claims they held on the deposit (Book 12, pages 687-738, Recorder's Office, Petersburg Recording District) but there is little public record of more recent work.
Comment (Deposit): Model Name = Barite facies of a Kuroko volcanogenic massive-sulfide model (Cox and Singer, 1986m, model 28a). Alternatively a barite facies of a volcanogenic Sierran Kuroko model (Bliss, 1992, model 28a1)
Comment (Geology): Geologic Description = A prospect known since the late 1970's but not well documented. Consists of volcanogenic massive sulfide layers in Triassic Hyd Group rocks analogous to other similar deposits in the Duncan-Zarembo mineral belt as defined by Berg and Grybeck (1980) and Berg (1981). . Brew (1997 [OF 97-156-J]) maps the rocks in the vicinity as Cretaceous diorite and Mesozoic volcanic rocks but recent mapping by Karl (oral communication, 1998) indicates that at least some Triassic Hyd Group rocks are exposed at the southeast end of Butterworth Island.
Comment (Exploration): Status = Active?
References
Reference (Deposit): Brew, D.A., 1997, Reconnaissance geologic map of the Petersburg C-4 quadrangle, southeastern Alaska: U.S. Geological Survey Open-File Report 97-156-J, 21 p., 1 sheet, scale 1:63,360.
Reference (Deposit): Berg, H.C., 1981, Upper Triassic volcanogenic massive sulfide metallogenic province identified in southeastern Alaska, in Albert, N.R.D., and Hudson, T.L., eds., The United States Geological Survey in Alaska: accomplishments during 1979: U.S. Geological Survey Circular 823-B, p. B104-B108.
Reference (Deposit): Berg, H. C., and Grybeck, Donald, 1980, Upper Triassic volcanogenic Zn-Pb-Ag (-Cu-Au) mineral deposits near Petersburg, Alaska: U.S. Geological Survey Open-File Report 80-527, 11 p., 1 oversize sheet.
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