Unnamed (mouth of Johns Hopkins Inlet)

The Unnamed (mouth of Johns Hopkins Inlet) is a zinc 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 (mouth of Johns Hopkins Inlet)

Commodity

Primary: Zinc
Secondary: Lead
Secondary: Copper
Secondary: Gold
Secondary: Silver

Location

State: Alaska
District: Juneau

Land Status

Not available

Holdings

Not available

Workings

Not available

Ownership

Not available

Production

Not available

Deposit

Record Type: Site
Operation Category: Occurrence
Operation Type: Unknown
Years of Production:
Organization:
Significant:

Physiography

Not available

Mineral Deposit Model

Model Name: Polymetallic veins

Orebody

Not available

Structure

Not available

Alterations

Not available

Rocks

Not available

Analytical Data

Not available

Materials

Ore: Chalcopyrite
Ore: Galena
Ore: Sphalerite
Ore: Pyrite
Ore: Pyrrhotite
Gangue: Calcite
Gangue: Quartz

Comments

Comment (Commodity): Ore Material = pyrite or pyrrhotite

Comment (Deposit): Model Name = Polymetallic quartz-calcite vein -- similar to polymetallic veins (Cox and Singer, 1986; model 22c).

Comment (Reference): Primary Reference = Kimball and others, 1978

Comment (Workings): Workings / Exploration = Surface exposure, no workings. A chip sample of the full width of the vein (3.5 feet) contained 4,300 ppm zinc, 770 ppm copper, 250 ppm lead,15 ppm silver, and 0.03 ppm gold (Kimball and others, 1978, table C39, p. C191).

Comment (Geology): Geologic Description = The area is mainly underlain by heterogenous granitic rocks of Cretaceous age (Brew and others, 1978). The granitic rocks are cut by a quartz-calcite vein as much as 3.5 feet thick which contains lenses of iron sulfide-rich massive sulfide. Sphalerite and chalcopyrite are also present in the sulfide lenses. The quartz-calcite vein can be traced for about 100 feet to overburden cover. A sample across the widest part of the vein contained 4,300 ppm zinc and lesser quantities of other base and precious metals.? the vein occurrence probably has one of two affinities. It may be related to the Orange Point (MF038) base metal-type mineralization, or it could represent the northwest limit of the Reid Inlet gold area, whose major deposits are the LeRoy (MF022), Rainbow (MF027), Rambler (MF028) and Highland Chief (MF030). Although the most productive veins of the Reid Inlet area were gold-rich, sphalerite occurs widely and in some veins is predominant.

Comment (Deposit): Other Comments = Worth additional prospecting, as possibly related to Orange Point or Reid Inlet mineralization. Prospect is in Glacier Bay National Park and Preserve.

Comment (Geology): Age = Cretaceous or younger.

Comment (Exploration): Status = Inactive

References

Reference (Deposit): Brew, D.A., Johnson, B.R., Grybeck, D., Griscom, A., Barnes, D.F., Kimball, A.L., Still, J.C., and Rataj, J.L., 1978, Mineral resources of the Glacier Bay National Monument Wilderness Study Area, Alaska: U.S. Geological Survey Open-File Report 78-494, 670 p.

Reference (Deposit): Kimball, A.L., Still, J.C., and Rataj, J.L., 1978, Mineral resources, in Brew, D. A., and others, Mineral resources of the Glacier Bay National Monument wilderness study area, Alaska: U.S. Geological Survey Open-File Report 78-494, p. C1-C375.

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