|Quadrangle map, 1:250,000-scale||EA|
|Quadrangle map, 1:63,360-scale||B-1|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||This occurrence is located along the Taylor Highway and O'Brien Creek, about 1.2 miles southeast of the mouth of Columbia Creek. The occurrence is in section 3, T. 5 S., R. 32 E., of the Fairbanks Meridian. The location is accurate within 1,000 feet.|
Geologic descriptionThe rocks in the vicinity of this occurrence are predominantly Paleozoic greenschist-facies black carbonaceous quartzite (Dusel-Bacon and others, 1998). Approximately three-quarters of a mile to the south, these rocks are in fault contact with Paleozoic amphibolite-facies metamorphic rocks (Foster, 1976). Sulfides occur within buff-colored, celsian (barium-silicate) -bearing quartzite. The sulfides, in decreasing order of abundance, are sphalerite, pyrite, galena, and chalcopyrite (Dusel-Bacon and others, 1998). Celsian-bearing quartzite from this site and another nearby occurrence (EA076) contain between 1.6 and 3.6 percent barium, 1.8 and 2.7 percent zinc, and 1,040 ppm and 3,980 ppm lead (Dusel-Bacon and others, 1998). Dusel-Bacon and others (1998) interpret this occurrence is interpreted to be a sedimentary-exhalative massive sulfide occurrence.
|Geologic map unit||(-141.38400066344, 64.4192935568101)|
|Mineral deposit model||Sedimentary exhalative massive sulfide (Cox and Singer, 1986; model 31a).|
|Mineral deposit model number||31a|
|Age of mineralization||Paleozoic or younger.|
|Indication of production||None|
Dusel-Bacon, Cynthia, Bressler, J.R., Takaoka, H., Mortensen, J.K., Oliver, D.H., Leventhal, J.S., Newberry, R.J., and Bundtzen, T.K., 1998, Stratiform zinc-lead mineralization in Nasina assemblage rocks of the Yukon-Tanana Upland in east-central Alaska: U.S. Geological Survey Open-File Report 98-340, 26 p. (World Wide Web URL, http://caldera.wr.usgs.gov/syngenms/OF98-340.html).
|Last report date||5/1/2002|