Fluorite Creek Gossan

Occurrence in Alaska, United States with commodities Silver, Gold, Copper, Lead, Zinc, Fluorine-Fluorite

Geologic information

Identification information

Deposit ID 10307846
Record type Site
Current site name Fluorite Creek Gossan

Geographic coordinates

Geographic coordinates: -154.25683, 62.14947 (WGS84)
Relative position The Fluorite Creek Gossan occurrence is located along the eastern limit of Fluorite Creek glacier at an elevation of 4,100 feet (1,250 m) in the SE1/4 sec. 20, T. 24 N., R. 27 W., of the Seward Meridian. The gossan zone is mainly exposed in talus derived from a cliff source.
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Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Silver Primary
Gold Primary
Copper Primary
Lead Primary
Zinc Primary
Fluorine-Fluorite Secondary

Materials information

Materials Type of material
Pyrite Ore
Fluorite Gangue

Alteration

  • (Local) Oxidation to ferricrete gossan.

Mineral occurrence model information

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

Nearby scientific data

(1) -154.25683, 62.14947

Comments on the geologic information

  • Geologic Description = The Fluorite Creek Gossan occurrence is a small but prominent gossan zone in a cliff above the southwest side of the 1967 terminus of Fluorite Creek glacier (Herreid, 1968). The gossan is near the northern contact between the Middle Fork composite plutonic complex (Solie, 1983; Gilbert and others, 1988) and the Lower to mid-Paleozoic Dillinger subterrane (Bundtzen, Harris, and Gilbert, 1997). Only pyrite has been identified at the site; the original sulfides have been oxidized to an extensive ferricrete gossan. Green fluorite float was found in the creek about 3 kilometers below the gossan area. Apparently representative gossan (not in place) contains maximum values of 2.04 grams/tonne gold, 5.40 grams/tonne silver, 1.00 percent copper, 0.10 percent lead, and 0.20 percent zinc. According to Herreid (1968), it is unlikely that a large amount of material of this grade is present in the Fluorite Creek drainage.

Economic information

Economic information about the deposit and operations

Development status Occurrence

Comments on exploration

  • Status = Inactive

Mining district

District name McGrath

Comments on the reserve resource information

  • Reserves = According to Herreid (1968), it is unlikely that a large amount of metalliferous material is present in Fluorite Creek drainage.

Comments on the workings information

  • Workings / Exploration = The Fluorite Creek Gossan was discovered and described by Herreid (1968). Surface samples of apparently representative gossan (not in place) contains maximum values of 2.04 grams/tonne gold, 5.40 grams/tonne silver, 1.00 percent copper, 0.10 percent lead, and 0.20 percent zinc (Herreid, 1968).

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Alaska Resource Data File ARDF MG034

Bibliographic references

  • Deposit

    Solie, D.N., 1983, The Middle Fork plutonic complex, McGrath A-3 quadrangle, southwest Alaska: Alaska Division of Geological and Geophysical Surveys Report of Investigations 83-16, 22 pages.

  • Deposit

    Gilbert, W.G., Solie, D.N., and Kline, J.T., 1988, Geologic map of the McGrath A-3 quadrangle, Alaska: Alaska Division of Geological and Geophysical Surveys Professional Report 92, 2 sheets, 1:63,360 scale.

  • Deposit

    Bundtzen, T.K., Harris, E.E., and Gilbert, W.G., 1997, Geologic Map of the eastern McGrath quadrangle, Alaska: Alaska Division of Geological and Geophysical Surveys Report of Investigations 97-14, 34 pages, one sheet, scale 1:125,000.

  • Deposit

    Cobb, E.H., 1972, Metallic mineral resources map of the McGrath quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-379, 1 sheet, 1:250,000 scale.

  • Deposit

    Herreid, G.H., 1968, Geological and geochemical investigations southwest of Farewell, Alaska: Alaska Division of Mines and Geology Geologic Report 26, 24 p., 1 sheet, scale 1:75,000.

Comments on the references

  • Primary Reference = Herreid, 1968

General comments

Subject category Comment text
Deposit Model Name = Polymetallic veins (Cox and Singer, 1986; model 22c).

Reporter information

Type Date Name Affiliation Comment
Reporter 25-NOV-98 T.K. Bundtzen Pacific Rim Geological Consulting