1. Mineral Resources
  2. Online Spatial Data
  3. Mineral Resource Data System (MRDS)

Unnamed (east of Dundas Bay)

Occurrence in Alaska, United States with commodities Copper, Molybdenum, Silver
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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. 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 10002286
MRDS ID A013190
Record type Site
Current site name Unnamed (east of Dundas Bay)
Related records 10136539

Geographic coordinates

Geographic coordinates: -136.28207, 58.35472 (WGS84)
Relative position This occurrence is at an elevation of about 100 feet on the east side of Dundas Bay about 2.5 miles north of the mouth of the Bay. It is about 0.5 mile northeast of triangulation station Deed and is accurately located within about 0.25 mile. The location is approximately the same as number 58 of Cobb (1972), number 32 of MacKevett and others (1971), and number 68 of Kimball and others (1978).

Site location context

Political divisions (FIPS codes)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Mount Fairweather B-1 SW(quadrangle 1:24,000 scale)

Juneau SW(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
Molybdenum Primary
Silver Secondary

Materials information

Materials Type of material
Chalcopyrite Ore
Malachite Ore
Molybdenite Ore
Quartz Gangue

Alteration

  • (Local) Local oxidation of copper minerals.

Host and associated rocks

  • Host or associated Host
    Rock type Plutonic Rock > Mafic Intrusive Rock > Diorite
    Stratigraphic age (youngest) Late Cretaceous

Nearby scientific data

(1) -136.28207, 58.35472
ListMap

Economic information

Comments on the geologic information

  • Geologic Description = A foliated quartz diorite of Cretaceous age forms a stock-like pluton on the east side of the mouth of Dundas Bay. It is in contact to the north with metamorphosed sedimentary rocks of Devonian and Silurian age (Brew and others, 1978). MacKevett and others (1971) found malachite-stained quartz stringers, containing chalcopyrite and molybdenite, within quartz veins in cataclastic quartz diorite. The veins are of Late Cretaceous or younger age.? A sample collected to represent quartz-vein-bearing sheared rock contained 1000 ppm copper and 300 ppm molybdenum. Samples collected by the U.S. Bureau of Mines from the same or nearby sites contained as much as 1900 ppm copper, 10 ppm molybdenum, and 1 ppm silver.
  • Age = Probably 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 = There are no workings. A representative sample of copper-stained sheared and quartz-veined quartz diorite collected by MacKevett and others (1971, table 9 location 32) contained 1000 ppm copper and 300 ppm molybdenum. Chip samples collected by Bureau of Mines (Kimball and others, 1978, p. C270) contained as much as 1900 ppm copper, 10 ppm molybdenum and 1 ppm silver.

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

    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 = MacKevett and others, 1971

General comments

Subject category Comment text
Deposit Model Name = Low-sulfide quartz-copper-bearing vein.
Deposit Other Comments = the occurrence 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.