Unnamed (on Butterworth Island)

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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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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