Fluorite Creek Gossan

Occurrence, Inactive

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