|Quadrangle map, 1:250,000-scale||NM|
|Quadrangle map, 1:63,360-scale||C-1|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||This is a small bench placer mine located on the west side of Last Chance Creek, about 2,000 feet southwest of its confluence with North Fork Snake River. It is included in locality 89 of Cobb (1972 [MF 463], 1978 [OFR 78-93]). The map location is in the SW1/4 section 10, T. 9 S., R. 34 W., Kateel River Meridian. Mining claims were patented under U.S. Mineral Survey No. 1838.|
Geologic descriptionA bench placer was mined about 500 to 600 feet west of Last Chance Creek, immediately above its confluence with North Fork. The pit is oriented northeast, parallel to the modern drainage. The placer was mined hydraulically to bedrock for a distance of about 1,000 feet on the California Association and Good Chance Association claims (U.S. Mineral Survey No. 1838). Moffit (1913, p. 87) reported scheelite, pyrite, magnetite, and hematite from Last Chance Creek near Dewey Creek, a name not currently used. A quartz-ankerite vein cutting schistose bedrock is exposed at a bedrock drain of the cut. A sample of this vein did not contain gold, but it is similar to others in the area that are locally auriferous. Bedrock in the area is probably part of the 'mixed unit' of Till and others, 1986) and the calcareous metaturbidite schist of Bundtzen and others (1994).
|Geologic map unit||(-165.462016964561, 64.7206362431258)|
|Mineral deposit model||Alluvial placer Au (Cox and Singer, 1986; model 39a).|
|Mineral deposit model number||39a|
|Age of mineralization||Quaternary.|
|Workings or exploration||This small bench placer was mined hydraulically, probably before 1926. Claims were located between 1906 and 1916; the claims were surveyed for patent in 1926, and most of the workings predate that year.|
|Indication of production||Yes; small|
Bundtzen, T.K., Reger, R.D., Laird, G.M., Pinney, D.S., Clautice, K.H., Liss, S.A., and Cruse, G.R., 1994, Progress report on the geology and mineral resources of the Nome mining district: Alaska Division of Geological and Geophysical Surveys, Public Data-File 94-39, 21 p., 2 sheets, scale 1:63,360.
Cobb, E.H., 1972, Metallic mineral resources map of the Nome quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-463, 2 sheets, scale 1:250,000.
Cobb, E.H., 1978, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Nome quadrangle, Alaska: U.S. Geological Survey Open-File report 78-93, 213 p.
Moffit, F.H., 1913, Geology of the Nome and Grand Central quadrangles, Alaska: U.S. Geological Survey Bulletin 533, 140 p.
|Reporters||C.C. Hawley and Travis L. Hudson|
|Last report date||7/10/2000|