|Quadrangle map, 1:250,000-scale||KC|
|Quadrangle map, 1:63,360-scale||A-5|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||This occurrence is on the north shore of an unnamed small lake that drains into the head of Purple Lake. The site is in section 17, T. 78 S., R. 93 E., of the Copper River Meridian. It corresponds to loc. 23 in Berg (1972 [I 684]), loc. 147 in Elliott and others (1978), and loc. 42 in Karl (1992). The location is accurate within 0.1 mile.|
Geologic descriptionThe country rock in the area of this site is Silurian trondhjemite (Berg, 1972). Locally, the trondhjemite is sheared and sericitized, probably owing to Late Cretaceous greenschist-grade regional metamorphism. The occurrence consists of small amounts of chalcopyrite disseminated in the trondhjemite.
|Geologic map unit||(-131.440679262428, 55.107659237073)|
|Mineral deposit model||Disseminated Cu deposit of undetermined origin.|
|Alteration of deposit||Local sericitization of trondhjemite hostrock.|
|Indication of production||None|
Berg, H.C., 1972, Geologic map of Annette Island, Alaska: U.S. Geological Survey Miscellaneous Geologic Investigations Map I-684, 8 p., 1 sheet, scale 1:63,360.
|Reporters||H.C. Berg, USGS|
|Last report date||7/6/1999|