|Quadrangle map, 1:250,000-scale||GO|
|Quadrangle map, 1:63,360-scale||B-7|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||This prospect is on the divide between the headwaters of an unnamed north tributary to the Tunulik River and the Barnum Creek drainage. The prospect is in a saddle at an elevation of about 1,500 feet and about 1 mile west of a 2,298-foot summit of Ikuktlitlig Mountain It is locality 3 of Kilburn and others (1993).|
Geologic descriptionA composite mafic to felsic pluton intrudes Paleozoic to Mesozoic sedimentary and volcanic rocks in this area (Hoare and Coonrad, 1978). Surface observations completed for Calista Corporation (unpublished data), identified peridotite, diorite, granodiorite, and quartz monzonite in the intrusive complex. A variably silicified, chloritized, and biotite-altered, 800-foot-wide fractured zone in diorite contains chalcopyrite, arsenopyrite, pyrrhotite, and pyrite (Fechner, 1988, 61). Rock samples from the prospect contain up to 2.4 percent Cu, 25.2 ppm Ag, 0.16 ounce of gold per ton, and 0.99 percent As.
|Geologic map unit||(-161.492234284801, 59.2692244189581)|
|Mineral deposit model||Sulfide-bearing shear zone in diorite|
|Age of mineralization||Not known. The age of the host intrusive rock is probably Jurassic or Late Cretaceous/Early Tertiary, the age of other intrusive rocks in the region (Hoare and Coonrad, 1978).|
|Alteration of deposit||Silicification, chloritization, and biotite replacement (?).|
|Workings or exploration||Reconnaissance surface observations and sampling have been completed in the prospect area.|
|Indication of production||None|
Fechner, S.A., 1988, Bureau of Mines mineral investigation of the Goodnews Bay mining district, Alaska: U.S. Bureau of Mines Open-File Report 1-88, 230 p., 3 sheets.
Hoare, J.M., and Coonrad, W.L., 1978, Geologic map of the Goodnews and Hagemeister Island quadrangles region, southwestern Alaska: U.S. Geological Survey Open-File Report 78-9-B, 2 sheets, scale 1:250,000.
Kilburn, J.E., Goldfarb, R.J., Griscom, Andrew, and Box, S E., 1993, Map showing metallic mineral resource potential in the Goodnews Bay, Hagemeister Island, and Nushagak Bay 1 degree x 3 degree quadrangles, southwest Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-2228, 4 sheets, scale 1:250,000.
|Reporters||Travis L. Hudson|
|Last report date||3/20/2001|