Fluorite Creek Gossan

The Fluorite Creek Gossan is a lead, copper, gold, zinc, and silver mine located in Alaska.

About the MRDS Data:

All mine locations were obtained from the USGS Mineral Resources Data System. The locations and other information in this database have not been verified for accuracy. It should be assumed that all mines are on private property.

Mine Info

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Site Name

Primary: Fluorite Creek Gossan

Commodity

Primary: Lead
Primary: Copper
Primary: Gold
Primary: Zinc
Primary: Silver
Secondary: Fluorine-Fluorite

Location

State: Alaska
District: McGrath

Land Status

Not available

Holdings

Not available

Workings

Not available

Ownership

Not available

Production

Not available

Deposit

Record Type: Site
Operation Category: Occurrence
Operation Type: Unknown
Years of Production:
Organization:
Significant:

Physiography

Not available

Mineral Deposit Model

Model Name: Polymetallic veins

Orebody

Not available

Structure

Not available

Alterations

Alteration Type: L
Alteration Text: Oxidation to ferricrete gossan.

Rocks

Not available

Analytical Data

Not available

Materials

Ore: Pyrite
Gangue: Fluorite

Comments

Comment (Workings): 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).

Comment (Geology): 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.

Comment (Exploration): Status = Inactive

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

Comment (Reference): Primary Reference = Herreid, 1968

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

References

Reference (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.

Reference (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.

Reference (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.

Reference (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.

Reference (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.

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