|Quadrangle map, 1:250,000-scale||SI|
|Quadrangle map, 1:63,360-scale||C-1|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||This occurrence is on the southwest shore of Hasselborg Lake 0.2 mile east of the gaging station at the mouth of Hasselborg Creek. The occurrence is on the north boundary of sec. 6, T. 49 S., R. 70 E. It is location 67 of Cobb (1972, 1978) and MAS no. 0021140177 (U.S. Bureau of Land Management, 2002). The location is accurate within 0.2 mile.|
Geologic descriptionThe rocks in the vicinity of this prospect are part of a unit of Mesozoic and Paleozoic, undifferentiated metamorphic rocks (Lathram and others, 1965). Race and Rose (1967) describe a vein of massive pyrite and chalcopyrite with a little quartz, in sheared and fractured chert. The vein is about a foot thick, strikes N40W, and dips 23NE. A sample contained 2 percent copper, 0.04 ounce of gold per ton, 0.66 ounce of silver per ton, and no lead, zinc, or nickel. The vein had been cleared off but they found no evidence of a claim.
|Geologic map unit||(-134.24864553652, 57.6611628944405)|
|Mineral deposit model||Vein of pyrite and chalcopyrite.|
|Age of mineralization||Paleozoic or younger.|
|Workings or exploration||The vein here had been cleared off but there was no evidence (in 1965) that a claim had been staked.|
|Indication of production||None|
Additional commentsThe prospect is now within the Wilderness of the Admiralty Island National Monument and is closed to mineral exploration and development.
Cobb, E.H., 1972, Metallic mineral resources map of the Sitka quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-467, scale 1:250,000.
Cobb, E.H., 1978, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Sitka quadrangle: U.S. Geological Survey Open-File Report 78-450, 124 p.
Lathram, E.H., Pomeroy, J.S., Berg, H.C., and Loney, R.A., 1965, Reconnaissance geology of Admiralty Island, Alaska: U.S. Geological Survey Bulletin 1181-R, p. R1-R48.
Race, W.H., and Rose, A.W., 1967, Geochemical and geological investigations of Admiralty Island, southeastern Alaska: Alaska Division of Geological and Geophysical Surveys, Geochemical Report 8, 45 p.
U.S. Bureau of Land Management, 2002, Alaska mineral locations database report (Sitka quadrangle), July 2, 2002, 205 p. [http://imcg.wr.usgs.gov/dem.html]
|Reporters||Donald Grybeck (U.S. Geological Survey)|
|Last report date||5/5/2005|