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  3. Mineral Resource Data System (MRDS)

Unnamed (mouth of Johns Hopkins Inlet)

Occurrence in Alaska, United States with commodities Zinc, Silver, Gold, Copper, Lead
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Sections on this page
  1. Identification information
  2. Geographic coordinates
  3. Site location context
  4. Geographic areas
  5. Commodities
  6. Materials information
  7. Mineral occurrence model information
  8. Host and associated rocks
  9. Nearby scientific data
  10. Economic information about the deposit and operations
  11. Mining district
  12. Links to other databases
  13. Bibliographic references
  14. General comments
  15. Reporter information

Geologic information

Identification information

Deposit ID 10002246
MRDS ID A013148
Record type Site
Current site name Unnamed (mouth of Johns Hopkins Inlet)
Related records 10233602

Geographic coordinates

Geographic coordinates: -136.93212, 58.92083 (WGS84)
Relative position The occurrence is about 0.3 mile north of the point that separates Tarr and Johns Hopkins Inlets. It is close to the shore line, and is known within a few hundred feet. The location is number 45 of Kimball and others (1978).

Site location context

Political divisions (FIPS codes)

Hoonah-Angoon(Census area)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Mount Fairweather D-3(quadrangle 1:63,360 scale)

Mount Fairweather NE(quadrangle 1:100,000 scale)

Mount Fairweather(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Glacier Bay(hydrologic unit)

Northern Southeast Alaska(hydrologic accounting unit)

Southeast Alaska(hydrologic subregion)

Alaska(hydrologic region)

Federal lands

Glacier Bay National Park(National Park)

National Park NPS(Type of land area)

NPS(Federal land areas administered by NPS)

Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Zinc Critical Primary
Silver Secondary
Gold Secondary
Copper Secondary
Lead Secondary

Comments on the commodity information

  • Ore Material = pyrite or pyrrhotite

Materials information

Materials Type of material
Chalcopyrite Ore
Galena Ore
Sphalerite Ore
Pyrite Ore
Pyrrhotite Ore
Calcite Gangue
Quartz Gangue

Mineral occurrence model information

Model code 85
USGS model code 22c
Deposit model name Polymetallic veins
Mark3 model number 46

Host and associated rocks

  • Host or associated Host
    Rock type Metamorphic Rock > Gneiss

Nearby scientific data

(1) -136.93212, 58.92083
ListMap

Economic information

Comments on the geologic information

  • 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.
  • Age = Cretaceous or younger.

Economic information about the deposit and operations

Development status Occurrence
Commodity type Metallic

Comments on exploration

  • Status = Inactive

Mining district

District name Juneau

Comments on the workings information

  • 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).

Reference information

Bibliographic references

  • 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.

  • 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.

Comments on the references

  • Primary Reference = Kimball and others, 1978

General comments

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

Reporter information

Type Date Name Affiliation Comment
Reporter 09-APR-99 Hawley, C.C. Hawley Resource Group

Beyond USGS

Supplemental information added by qvyshift.com. Not part of the original USGS MRDS record.

Maps centered on this site

Authoritative Alaska resources

These are landing pages for further research — the state agencies don't currently expose per-mine deep links.