|Quadrangle map, 1:250,000-scale||SM|
|Quadrangle map, 1:63,360-scale||A-8|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||This occurrence is located on a north-south-trending ridge line on the western side of the Buckstock Mountains to the east of an unnamed tributary of the Buckstock River. The occurrence is about 0.2 mile south of hill 2170, in the NE1/4 sec. 31, T. 13 N., R. 53 W., of the Seward Meridian. The location is accurate.|
Geologic descriptionThis occurrence consists of a quartz-sulfide vein and sulfides disseminated in granite porphyry that is part of a dense dike swarm that intrudes shale and sandstone of the Upper Cretaceous, Kuskokwim Group (Cady and others, 1955). The swarm strikes east-west, dips vertically, and includes granite porphyry, granodiorite, and minor mafic dikes. Most dikes have undergone various degrees of sericitic alteration. At least 10 different dikes, each ranging from 10 to 50 feet thick cross a ridge over a distance of about 1,600 feet. One quartz vein, which strikes about N80W and dips vertically, contains masses of up to 20 percent arsenopyrite and 1 to 3 percent stibnite (T.K. Bundtzen, unpublished data, 1992). One sample reported by Gray, Motooka, and Theodorakos (1997) contained 73 parts per million (ppm) bismuth, 130 ppm arsenic, and 48 ppm copper.
|Geologic map unit||(-158.841670652491, 61.1780572092731)|
|Mineral deposit model||Polymetallic vein (Cox and Singer, 1986; model 22c).|
|Mineral deposit model number||22c|
|Alteration of deposit||Sericitization of dikes.|
|Workings or exploration||An old, shallow, caved-in prospect pit exposed some of the arsenopyrite bearing mineralized. This occurrence was investigated and sampled in 1992 (T.K. Bundtzen, unpublished data, 1992).|
|Indication of production||None|
Cady, W.M., Wallace, R.E., Hoare, J.M., and Webber, E.J., 1955, The central Kuskokwim region, Alaska: U.S. Geological Survey Professional Paper 268, 132 p.
Gray, J.E., Motooka, Jerry, and Theodorakos, P.M., 1997, Areas favorable for metallic resources and newly discovered mineral occurrences in the Buckstock Mountains area, southwestern Alaska, in Dumoulin, J.A., and Gray, J.E., eds, Geologic Studies in Alaska by the U.S. Geological Survey in 1995: U.S. Geological Survey Professional Paper 1574, p. 111- 124.
|Reporters||T.K. Bundtzen (Pacific Rim Geological Consulting, Inc.) and M.L. Miller (U.S. Geological Survey)|
|Last report date||5/8/2003|