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Skagway

Prospect in Alaska, United States with commodity Uranium
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Sections on this page
  1. Identification information
  2. Geographic coordinates
  3. Site location context
  4. Geographic areas
  5. Commodities
  6. Alteration
  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 10002209
MRDS ID A013110
Record type Site
Current site name Skagway
Related records 10112927

Geographic coordinates

Geographic coordinates: -135.28211, 59.47976 (WGS84)
Relative position Freeman (1963) describes this prospect as located, '..on a steep hillside about 250 feet above the tracks of the White Pass and Yukon Railroad opposite the oil tanks of the Standard Oil Company of California.' Based on Freeman's description, the prospect appears to be located about 2 miles northeast of the Skagway ferry terminal, just east of the White Pass and Yukon Railroad tracks. Its location is probably accurate to within about 1/4 mile. It is shown as location 20 by Cobb (1972 [MF 424]).

Site location context

Political divisions (FIPS codes)

Hoonah-Angoon(Census area)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Skagway B-1(quadrangle 1:63,360 scale)

Skagway SE(quadrangle 1:100,000 scale)

Skagway(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Chilkat-Skagway Rivers(hydrologic unit)

Northern Southeast Alaska(hydrologic accounting unit)

Southeast Alaska(hydrologic subregion)

Alaska(hydrologic region)

Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Uranium Primary

Alteration

  • (Local) Clay alteration of rhyolite (?), iron staining.

Mineral occurrence model information

Model code 155
USGS model code 25f
Deposit model name Volcanogenic U

Host and associated rocks

  • Host or associated Host
    Rock type Volcanic Rock (Aphanitic) > Felsic Volcanic Rock > Rhyolite

Nearby scientific data

(1) -135.28211, 59.47976
ListMap

Economic information

Comments on the geologic information

  • Geologic Description = The following description if from Freeman (1963). A small altered body of rhyolite(?) is surrounded by medium-grained quartz diorite. The quartz diorite is cut by several large faults and is intruded by fine-grained andesitic dikes. Uranium occurs adjacent to a prominent, steeply dipping fracture in the rhyolite(?), where it is associated with iron oxide staining and globules of clay that resemble vesicle fillings. The highest grade sample of olive-green clay that was probably hand picked from vesicles in the rhyolite(?), contained 0.72% equivalent uranium and 1.2% uranium. The amount of this material is very small and most of the mineralization consists of highly altered rhyolite(?) stained with red and yellowish brown iron oxides that contained up to 0.22% equivalent uranium. No sulfides or gangue minerals were seen except for specks of purple fluorite. The age of the mineralization is not well established, but it is probably Tertiary based on the Paleocene and Eocene ages (Brew and Ford, 1994) of the intrusive rocks in the area.
  • Age = Probably Tertiary based on the Paleocene and Eocene ages (Brew and Ford, 1994) of intrusive rocks in the area.

Economic information about the deposit and operations

Development status Prospect
Commodity type Metallic

Comments on exploration

  • Status = Inactive

Mining district

District name Juneau (Skagway subdistrict)

Comments on the workings information

  • Workings / Exploration = One prospect pit yielded a few hundred pounds of specimens, but when inspected by USGS in 1956 no ore was in sight (Berg and Cobb, 1967).

Reference information

Bibliographic references

  • Deposit

    Freeman, V.L., 1963, Examination of uranium prospects, 1956: U.S. Geological Survey Bulletin 1155, p. 29-33.

  • Deposit

    Berg, H.C., and Cobb, E.H., 1967, Metalliferous Lode Deposits of Alaska. U.S. Geological Survey Bulletin 1246, 254 p.

  • Deposit

    Cobb, E.H., 1972, Metallic mineral resources map of the Skagway quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-424, 1 sheet, 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

    Berg, H.C., 1984, Regional geologic summary, metallogenesis, and mineral resources of southeastern Alaska: U.S. Geological Survey Open-file Report 84-572, 298 p., 1 plate, scale approx. 1:600,000.

  • Deposit

    Brew, D.A., and Ford, A.B., 1994, The coast mountains plutonic-metamorphic complex and related rocks between Haines, Alaska, and Fraser, British Columbia q tectonic and geologic sketches and Klondike Highway road log: U.S. Geological Survey Open-File Report 94-268, 25 p.

Comments on the references

  • Primary Reference = Freeman, 1963

General comments

Subject category Comment text
Deposit Model Name = Very little information. From the description of Freeman (1963), it is possibly a vein or fissure related uranium occurrence in highly altered rhyolite(?) (Cox and Singer, 1986; model 25f?).

Reporter information

Type Date Name Affiliation Comment
Reporter 04-FEB-2001 T.C. Crafford T. Crafford & Associates

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.