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  3. Mineral Resource Data System (MRDS)

Unnamed (west mouth of Shag Cove)

Occurrence in Alaska, United States with commodities Copper, Silver, Cobalt, Zinc
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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. Alteration
  8. Mineral occurrence model information
  9. Host and associated rocks
  10. Nearby scientific data
  11. Economic information about the deposit and operations
  12. Mining district
  13. Links to other databases
  14. Bibliographic references
  15. General comments
  16. Reporter information

Geologic information

Identification information

Deposit ID 10002274
MRDS ID A013178
Record type Site
Current site name Unnamed (west mouth of Shag Cove)
Related records 10234200

Geographic coordinates

Geographic coordinates: -136.34709, 58.64472 (WGS84)
Relative position This occurrence is at an elevation of about 100 feet on the west side of Shag Cove at the mouth of Geikie Inlet, and on a small island just offshore. The location is accurate within 0.1 mile. The site location number 49 of MacKevett and others (1971), number 46 of Cobb (1972), and number 93 of Kimball and others (1978). Kimball and others (1978) reported other mineral occurrences in the area.

Site location context

Political divisions (FIPS codes)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Mount Fairweather C-2 NE(quadrangle 1:24,000 scale)

Juneau NW(quadrangle 1:100,000 scale)

Mount Fairweather(quadrangle 1:250,000 scale)

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
Copper Primary
Silver Secondary
Cobalt Critical Secondary
Zinc Critical Secondary

Comments on the commodity information

  • Gangue = sheared wall rock minerals

Materials information

Materials Type of material
Azurite Ore
Bornite Ore
Chalcopyrite Ore
Cuprite Ore
Malachite Ore
Pyrite Ore
Pyrrhotite Ore
Quartz Gangue

Alteration

  • (Local) Local oxidation of copper minerals.

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 Associated
    Rock type Plutonic Rock > Mafic Intrusive Rock > Diorite
  • Host or associated Host
    Rock type Sedimentary Rock > Clastic Sedimentary Rock > Siltstone

Nearby scientific data

(1) -136.34709, 58.64472
ListMap

Economic information

Comments on the geologic information

  • Geologic Description = Schist, marble, and hornfels derived from sedimentary and volcanic rocks of Paleozoic age crop out west of Shag Cove. A major northwest-striking fault underlies the Cove and is one of the major faults of the Glacier Bay area. A splay off the master fault appears to separate the metamorphic terrane from granitic rocks of Cretaceous age about 0.3 mile southwest of the cove (Brew and others, 1978). ? the mineralized structure is a 65-foot-wide shear zone that strikes northeast and dips steeply northwest--apparently between the master and splay faults, both of which strike northwest.? the shear zone contains quartz veins and subparallel sulfide-rich pods. Pyrrhotite and pyrite are the most abundant sulfide minerals. Chalcopyrite and bornite, partly oxidized to azurite, malachite and cuprite (?), occur in lesser amounts. Sulfide-rich pods of pyrite, pyrrhotite and bornite also occur on the small island off the point at the north end of Shag Cove. A sample from a 3-foot-long sulfide pod in the shear zone contained 3000 ppm copper, 700 ppm zinc, 200 ppm cobalt, and 1 ppm silver (MacKevett and others, 1978, p. 51, table 9). A selected sample from a pod exposed on the island contained 1.5 ppm silver, 260 ppm copper, and 100 ppm cobalt (Kimball and others, 1978, p. C366-367).
  • 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; Inlet

Comments on the workings information

  • Workings / Exploration = There are no workings. The occurrence on the mainland contains as much as 3000 ppm copper, 700 ppm zinc, 200 ppm cobalt, and 1 ppm silver. A selected sample of a sulfide pod which crops out on the island contained 1.5 ppm silver, 260 ppm copper and 100 ppm cobalt. Kimball and others (1978) reported occurences of sulfide-bearing quartz veins 1/2 mile from the mouth of the cove and of sulfide-rich pods and sulfide-bearing quartz veins about 1 1/2 miles from the mouth of the cove.

Reference information

Bibliographic references

  • Deposit

    MacKevett, E.M., Jr., Brew, D.A., Hawley, C.C., Huff, L.C., and Smith, J.G., 1971, Mineral resources of Glacier Bay National Monument, Alaska: U.S. Geological Survey Professional Paper 632, 90 p., 12 plates, scale 1:250,000.

  • Deposit

    Cobb, E.H., 1978, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Mt. Fairweather and Skagway quadrangles, Alaska: U.S. Geological Survey Open-File Report 78-316, 123 p.

  • 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.

  • Deposit

    Cobb, E.H., 1972, Metallic mineral resources map of the Mount Fairweather quadrangle, AK: U.S. Geological Survey Miscellaneous Field Study Map MF-436, 1 sheet, scale 1:250,000.

Comments on the references

  • Primary Reference = Kimball and others, 1978

General comments

Subject category Comment text
Deposit Model Name = Polymetallic vein of probable igneous affiliation (Cox and Singer, 1986; model 22c).
Deposit Other Comments = the site is in Glacier Bay National Park and Preserve.

Reporter information

Type Date Name Affiliation Comment
Reporter 14-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.