|Quadrangle map, 1:250,000-scale||TN|
|Quadrangle map, 1:63,360-scale||B-6|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||According to Cobb (1972, location 1; Cobb, 1977), these lode occurrences are on the south side of Tozimoran Creek, at or just below the confluence of Ash Creek. Chapman and others (1963) report two small veins on the south side of Tozimoran Creek; one is a short distance downstream from the cabin, and the other is just above the mouth of Ash Creek. For this record, the site is approximately one thousand feet upstream from the cabin, in the east half of section 1, T. 6 N., R. 26 W., of the Fairbanks Meridian. The location is accurate within half a mile.|
Bedrock in the Tozimoran Creek area consists of metamorphosed sedimentary and mafic igneous rocks, including quartzite, quartz-mica schist, quartz-chlorite schist, epidote-albite-chlorite-actinolite schist, and subordinate marble and dolomite (Chapman and others, 1963; Chapman and others, 1982). The local bedrock is mainly quartz-mica schist (Thomas and Wright, 1948). Coarsely crystalline to porphyritic Cretaceous granite, cut by smaller granitic dikes, crops out about 5 miles north and west of Moran Dome (Chapman and others, 1982). The Tozimoran Creek placer mine (TN022) is less than a mile downstream from the lode occurrences.The lode occurrences reportedly consist of argentiferous galena- and cerussite-bearing quartz-calcite veins and galena veins on the south side of a creek in the headwaters of Tozimoran Creek (Wedow and others, 1952; Wedow and others, 1954). Barren quartz veins are common. Chapman and others (1963) report reddish-brown gossan, approximately 25 feet in diameter, on a hillside a short distance north of the mouth of Ash Creek, but they found no unweathered sulfides and no evidence of cassiterite mineralization in it. Pebbles of micaceous quartzite in Tozimoran Creek contain cassiterite and pale brown tourmaline veinlets (Chapman and others, 1963).
|Geologic map unit||(-152.814795485434, 65.3743465928042)|
|Mineral deposit model||Polymetallic veins (Cox and Singer, 1986; model 22c).|
|Mineral deposit model number||22c|
|Workings or exploration||These occurrences apparently have not been prospected by industry geologists.|
|Indication of production||None|
Chapman, R.M., Coats, R.R., and Payne, T.G., 1963, Placer tin deposits in central Alaska: U.S. Geological Survey Open-File Report 239, 53 p.
Chapman, R.M., Yeend, W.E., Brosge, W.P., and Reiser, H.N., 1982, Reconnaissance geologic map of the Tanana quadrangle: U.S. Geological Survey Open-File Report 82-734, 20 p., scale 1:250,000.
Cobb, E.H., 1972, Metallic mineral resources map of the Tanana quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-371, 1 sheet, scale 1:250,000.
Cobb, E.H., 1977, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Tanana quadrangle, Alaska: U.S. Geological Survey Open-File Report 77-432, 98 p.
Thomas, B.I., and Wright, W.S., 1948, Investigation of the Tozimoran Creek tin placer deposits, Fort Gibbon district, Alaska: U.S. Bureau of Mines Report of Investigations 4323, 11p.
Wedow, H., Jr., and Killeen, P. L., 1954, Reconnaissance for radioactive deposits in eastern interior Alaska, 1946: U.S. Geological Survey Circular 331, 36 p.
|Reporters||J.E. Athey (ADGGS), D.J. Szumigala (ADGGS)|
|Last report date||7/15/2003|