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Antonette

Occurrence, Inactive

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Commodities and mineralogy

Main commodities Ag; Au
Other commodities As; Cu; Hg; Pb; Zn
Ore minerals pyrite

Geographic location

Quadrangle map, 1:250,000-scale PM
Quadrangle map, 1:63,360-scale B-2
Latitude 55.256
Longitude -160.649
Nearby scientific data Find additional scientific data near this location
Location and accuracy The Antonette prospect, on northwestern Unga Island, is at an elevation of about 1,100 feet, in the SW1/4 of sec. 10, T. 57 S., R. 75 W., Seward Meridian. The location is accurate to within 2,500 feet.

Geologic setting

Geologic description

The rocks at this site are a sequence of rhyolitic lavas and ash-flow tuffs that have been brecciated, pyritized, silicified, and argillized (Peterson and others, 1982). They are part of the Eocene to Oligocene Popof volcanic rocks (Wilson and others, 1995). The exposed alteration is vertically zoned upward from silicification and pyritization to argillization. Four samples contained as much as 0.309 ppm gold, 1.03 ppm silver, 79 ppm copper, 25 ppm lead, 32 ppm zinc, 990 ppm arsenic, and 2.55 ppm mercury (Peterson and others, 1982).
Geologic map unit (-160.651044017502, 55.2551691845495)
Age of mineralization Eocene or younger.
Alteration of deposit The rocks exhibit silicification, pyritization, and argillization.

Production and reserves

Workings or exploration Four rock samples collected in 1982 by UNC Teton Exploration Drilling Company contained as much as 0.309 ppm gold, 1.03 ppm silver, 79 ppm copper, 25 ppm lead, 32 ppm zinc, 990 ppm arsenic, and 2.55 ppm mercury (Peterson and others, 1982).
Indication of production None

Additional comments

This prospect is located on land patented by, or interim-conveyed to, the Aleut Corporation.

References

MRDS Number 10308131

References

Peterson, R.J., Lemmers, J., Handverger, P., Gallagher, J., Pilcher, R., East, J., Macleod, T., Bartels. E., 1982, Geology and precious metals potential Unga, Popof, and Korovin Islands, Shumagin Group, Aleutian Chain, Alaska: UNC Teton Exploration Drilling Company report, 127 p., 5 map sheets, various scales. (Report held by the Aleut Corporation, Anchorage, Alaska.)
Wilson, F.H., Detterman, R.L., Miller, J. W., and Case, J.E., 1995, Geologic map of the Port Moller, Stepovak Bay, and Simeonof Island quadrangles, Alaska: U.S. Geological Survey Miscellaneous Investigation Series Map I-2272, 1 sheet, scale 1:250,000.
Reporters S.H. Pilcher
Last report date 1/31/2001