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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Unnamed (mouth of Johns Hopkins Inlet) MRDS details
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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