Unnamed (near Round Point)

The Unnamed (near Round Point) is a zinc, lead, 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: Unnamed (near Round Point)

Commodity

Primary: Zinc
Primary: Lead
Primary: Copper

Location

State: Alaska
District: Ketchikan

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: Chalcopyrite

Comments

Comment (Production): Production Notes = None

Comment (Reserve-Resource): Reserves = None

Comment (Reference): Primary Reference = Grybeck, Berg, and Karl, 1984

Comment (Workings): Workings / Exploration = Site was originally defined in 1984 by Grybeck, Berg, and Karl on the basis of a brief visit to an industry exploration camp nearby. However, exploration was more widespread than just the occurrence that the USGS visited and there may have been some drilling on the property. However, there is little indication that major surface exploration continued in this area much beyond the mid-80's, although the area may well have been further examined by industry since.

Comment (Deposit): Model Name = Kuroko volcanogenic massive-sulfide deposit (Cox and Singer, 1986; model 28a); alternatively a Sierran Kuroko volcanogenic massive sulfide deposit (Bliss, 1992; model 28a1)

Comment (Geology): Age = Probably Triassic.

Comment (Geology): Geologic Description = The mineralized exposure consists of rusty-weathering, light green-gray felsic metavolcanic rocks with small lenses, pods, and layers up to a foot thick that contain disseminated sulfides, mainly pyrite and possibly sphalerite and chalcopyrite. Analyses of grab samples show less than 5 ppm Cu, 50-150 ppm Pb, 200-11,000 Zn, and 150-5,000 Ba. The felsic metavolcanic rocks are interbedded with light gray, silicified limestone and dark gray argillite. Recent geologic mapping in the area (S. Karl, oral communication, 1998) indicates that the rocks in which the sulfides occurs are probably part of the Triassic Hyd Group. The site marked the southern end of the Duncan Canal-Zarembo belt of Triassic volcanogenic massive-sulfide mineralization as originally defined by Berg and Grybeck in 1980.

References

Reference (Deposit): Grybeck, D.J., Berg, H.C., and Karl, S.M., 1984, Map and description of the mineral deposits in the Petersburg and eastern Port Alexander quadrangles: U.S. Geological Survey Open-File Report 84-837, 86 p., 1 sheet, scale 1:250,000.

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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