|Quadrangle map, 1:250,000-scale||SW|
|Quadrangle map, 1:63,360-scale||B-6|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||This site is located near the southeast coast of Nakchamik Island (MacKevett and Holloway, 1977, locality 1). The island is approximately 10 miles south of Cape Kumliun in Chignik Bay. Site location is accurate to within 1 mile.|
Geologic descriptionThis site is marked by a color anomaly which coincides with a dacite plug dome that has intruded volcanics of the Oligocene and Eocene Meshik Formation (Detterman and others, 1981; Cox and others, 1981). This mineral occurrence has been described as a porphyry copper deposit consisting of disseminated sulfides in strongly altered intrusive and surrounding volcanic rocks (MacKevett and Holloway, 1977). No mention is made of ore or gangue minerals present.
|Geologic map unit||(-157.822037228436, 56.3192330703889)|
|Mineral deposit model||Porphyry copper (Cox and Singer, 1986, model 17)|
|Mineral deposit model number||17|
|Age of mineralization||Tertiary.|
|Alteration of deposit||The alteration is unknown but probably includes propylitic and sericitic types.|
|Workings or exploration||Apparently this occurrence has had post-1950 activity (U.S. Bureau of Mines, 1973).|
|Indication of production||None|
Additional commentsThis site is located on land selected by the Koniag Native Corporation.
Cox, D.P., Detra, D.E., and Detterman, R.L., 1981, Mineral resource maps of the Chignik and Sutwik Island quadrangles, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF- 1053-K, 2 sheets, scale 1:250,000.
Detterman, R.L., Miller, T.P., Yount, M.E., and Wilson, F.H.,1981, Geologic map the Chignik and Sutwik Island quadrangles Alaska: U.S. Geologic Survey Miscellaneous Investigations Series Map I-1229, 1 sheet, scale 1:250,000.
MacKevett, E.M., Jr., and Holloway, C.D., 1977, Map showing metalliferous mineral deposits in the western part of southern Alaska: U.S. Geological Survey Open-File Report 77-169-F, 38 p., 1 sheet, scale 1:1,000,000.
U.S. Bureau of Mines, 1973, Alaska 1:250,000-scale quadrangle map overlays showing mineral deposit locations, principal minerals, and number and type of claims: U.S. Bureau of Mines Open-File Report 20-73, 95 overlays (updated in 1986, 1987).
|Reporters||S.H. Pilcher (Anchorage)|
|Last report date||1/31/2000|