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Fluorite Creek Gossan

Occurrence, Inactive

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Commodities and mineralogy

Main commodities Ag; Au; Cu; Pb; Zn
Other commodities F
Ore minerals pyrite
Gangue minerals fluorite

Geographic location

Quadrangle map, 1:250,000-scale MG
Quadrangle map, 1:63,360-scale A-3
Latitude 62.15
Longitude -154.254
Nearby scientific data Find additional scientific data near this location
Location and accuracy 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.

Geologic setting

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.
Geologic map unit (-154.256229715838, 62.1493678760402)
Mineral deposit model Polymetallic veins (Cox and Singer, 1986; model 22c).
Mineral deposit model number 22c
Alteration of deposit Oxidation to ferricrete gossan.

Production and reserves

Workings or 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).
Indication of production None
Reserve estimates According to Herreid (1968), it is unlikely that a large amount of metalliferous material is present in Fluorite Creek drainage.

References

MRDS Number 10307846

References

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 p., 1 sheet, scale 1:125,000.
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.
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, scale 1:63,360.
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.
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, 17 p.
Reporters T.K. Bundtzen (Pacific Rim Geological Consulting)
Last report date 11/25/1998