|Ore minerals||chalcopyrite; malachite|
|Quadrangle map, 1:250,000-scale||KC|
|Quadrangle map, 1:63,360-scale||B-5|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||This occurrence is on the southwest shore of Annette Bay, about 1.6 miles from the head of the bay. The site is in section 23, T. 76 S., R. 91 E., of the Copper River Meridian. It corresponds to loc. 2 in Karl (1992). The location is accurate within about 0.1 mile.|
The country rocks in the area of this site are Upper Jurassic or Cretaceous andesitic and basaltic metavolcanic rocks that are gradationally interbedded with flyschlike metasedimentary rocks (Berg, 1972 [I 684]; Berg and others, 1988). The bedded rocks are intruded by a diorite stock, also of Jurassic or Cretaceous age. The rocks were regionally metamorphosed to
greenschist-grade phyllite and semischist in Late Cretaceous time.The occurrence consists of sparsely disseminated chalcopyrite in chloritic metavolcanic schist near the contact of the diorite stock (Karl, 1992, loc. 2). Malachite occurs locally on the foliation planes of the schist. Analyses of 15 samples collected in 1969-70 by private interests contained up to 468 ppm Cu.
|Geologic map unit||(-131.547683063205, 55.2586539746067)|
|Mineral deposit model||Disseminated sulfide deposit of undetermined origin.|
|Workings or exploration||Analyses of 15 samples collected in 1969-70 by private interests contained up to 468 ppm Cu (Karl, 1992, loc. 2).|
|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||7/7/1999|