Unnamed (in Glacier Basin)

The Unnamed (in Glacier Basin) 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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Site Name

Primary: Unnamed (in Glacier Basin)

Commodity

Primary: Zinc
Primary: Lead
Secondary: Molybdenum

Location

State: Alaska
District: Petersburg

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: Replacement Sn

Orebody

Not available

Structure

Not available

Alterations

Alteration Type: L
Alteration Text: Deposits associated with development of pyroxene-epidote-garnet skarn.

Rocks

Not available

Analytical Data

Not available

Materials

Ore: Galena
Ore: Sphalerite
Gangue: Fluorite
Gangue: Quartz

Comments

Comment (Deposit): Model Name = Banded Ag-Sn-Pb-Zn skarn (Cox and Singer, 1986; model 14c); fluorite-galena vein

Comment (Geology): Age = 15-20 Ma (see geologic description).

Comment (Deposit): Other Comments = Gault and others, (1953) provide detailed maps of the underground workings as well as a detailed surface geologic map that covers Groundhog Basin and extends southward to Glacier Basin to include this this site.

Comment (Reference): Primary Reference = Gault and others, 1953

Comment (Geology): Geologic Description = The prospects contain two distinct types of deposits that may be genetically related (Gault and others, 1953; Newberry and Brew, 1989). The first consists of small, discontinuous, banded galena-sphalerite-magnetite lenses probably continuous with those in Groundhog Basin (PE040) These deposits are relatively small and scattered as compared to those in Groundhog Basin, but are essentially the same in mineralogy and origin. They occur as layers in the gneiss and schist that locally includes interlayered amphibolite, marble, and calcsilicate units. These are interpreted as replacement deposits with skarn affinities. The second type of deposit consists of quartz-fluorite veins with galena that are exposed in two small adits where they cut a Tertiary rhyolite sill. Several other rhyolite bodies are nearby; most are conformable with the foliation of the metamorphic rocks. The rhyolite sills and dikes are probably cogenetic with the 20 m.y. or younger bodies associated with the Mo deposits in the area (see PE043) and/or with the 15-17 Ma zinnwaldite 'tin' granite associated with the Groundhog Basin deposits. Newberry and Brew (1989) provide analytical data for the tin content of several sulfide-rich occurrences within this site. The tin content is distinctly lower than ore samples from Groundhog Basin and their conclusion is that the Glacier Basin deposits are further from the source of the hydrothermal fluids that formed them, i.e. from the zinnwaldite 'tin' granite at the north end of Groundhog Basin.

Comment (Workings): Workings / Exploration = The deposits have been known since 1899 and two old adits with an aggregate length of about 82 feet of underground workings have been driven on galena-rich veins that cut a rhyolite sill. Several shallow pits have also been dug on various sulfide occurrences within the area, but none appears to have exposed anything of significant size.

Comment (Reserve-Resource): Reserves = None

Comment (Production): Production Notes = None

References

Reference (Deposit): Newberry, R.J., and Brew, D.A., 1989, Epigenetic hydrothermal origin of the Groundhog Basin-Glacier Basin silver-tin-lead-zinc deposits, southeastern Alaska: U.S. Geological Survey Bulletin 1903, p. 113-121.

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): Cobb, E.H., 1972, Metallic mineral resources map of the Petersburg quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-415, 1 sheet, scale 1:250,000.

Reference (Deposit): Brew, D.A., 1997, Reconnaissance geologic map of the Petersburg B-1 quadrangle, southeastern Alaska: U.S. Geological Survey Open-File Report 97-156-C, 20 p., 1 sheet, scale 1:63,360.

Reference (Deposit): Wright, F.E., and Wright, C.W., 1908, The Ketchikan and Wrangell mining districts, Alaska: U.S. Geological Survey Bulletin 347, 210 p.

Reference (Deposit): Cobb, E.H., 1978, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Petersburg quadrangle, Alaska: U.S. Geological Survey Open-File Report 78-870, 53 p.

Reference (Deposit): Gault, H.R., Rossman, D.L., Flint, G.M., Jr., and Ray, R.G., 1953, Some lead-zinc deposits of the Wrangell district, Alaska: U.S. Geological Survey Bulletin 998-B, p. 15-58.

Reference (Deposit): Cobb, E. H., 1972, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Petersburg Quadrangle, Alaska: U.S. Geological Survey Open-File Report 78-870, 53 p.

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