|Quadrangle map, 1:250,000-scale||RB|
|Quadrangle map, 1:63,360-scale||B-6|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||Swift Creek is a south-flowing headwater tributary of Basin Creek. Coordinates given are for the approximate center of location 10 if Cobb (1972 [MF405]), in section 26, T. 12 S., R. 16 E. of the Kateel River meridian. The location is accurate to 1/2 mile. An error was identified on the USGS Ruby Quadrangle 1:250,000 scale map (1952, minor corrections in 1984), where Swift Creek has been renamed Lion Creek, and Willow Creek, the eastern headwater tributary of Basin Creek has been renamed Swift Creek. This error was not identified on the Ruby (B-6) Quadrangle map or earlier uneditted maps.|
Geologic descriptionMost of the bedrock underneath Swift Creek is graywacke (Eberlein and others, 1977). Some prospecting along Swift Creek took place around 1915 (Mertie and Harrington, 1916). A few holes were sunk about 1 mile from the mouth of the stream; bedrock was at 35 feet in the upstream holes and was deeper than 75 feet 1/2 mile downstream (Mertie and Harrington, 1916). Gold was found on a false bedrock of clay-rich gravel. The gold was fine, bright, and very slightly rounded. Although considerable magnetite was present, few, if any, sulfides were found in the placer gravels (Mertie and Harrington, 1916). Work in 1915 consisted of open-cut mining at the head of the creek; farther downstream miners sluiced off 10 to 12 feet of muck and then mined 6 to 8 feet of gravel (Mertie and Harrington, 1916). Mining continued intermittently on Swift Creek until at least 1991 (Mertie, 1936; Eakins and others, 1985; Green and others, 1989; Bundtzen and others, 1990; Swainbank and others, 1991; Bundtzen and others, 1992).
|Geologic map unit||(-155.615494786611, 64.4263726776436)|
|Mineral deposit model||Placer Au (Cox and Singer, 1986; model 39a).|
|Mineral deposit model number||39a|
|Age of mineralization||Quaternary?|
|Workings or exploration||Work in 1915 consisted of open-cut mining at the head of the creek, and sluicing off 10 to 12 feet of muck and then mining 6 to 8 feet of gravel farther downstream (Mertie and Harrington, 1916). Intermittent mining of Swift Creek continued until at least 1991 (Eakins and others, 1985; Green and others, 1989; Bundtzen and others, 1990; Swainbank and others, 1991; Bundtzen and others, 1992).|
|Indication of production||Undetermined|
Additional commentsSome confusion about Willow Creek exists because the USGS Ruby quadrangle topographic map (1952, minor revisions in 1984) has mislabeled Willow Creek as Swift Creek and renamed the former Swift Creek as Lion Creek; probably switched the labels of Swift and Willow Creeks. Larger scale maps appear to be correct.
Bundtzen, T.K., Swainbank, R.C., Wood, J.E., Clough, A.H., 1991 (1992), Alaska's Mineral Industry 1991: Alaska Division of Geological & Geophysical Surveys, Special Report 46, 89 p.
Cobb, E.H., 1972, Metallic mineral resources map of the Ruby quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-405, 1 sheet, scale 1:250,000.
Cobb, E.H., and Chapman, R.M., 1981, Mineral occurrences (other than mineral fuels and construction materials) in the Kantishna River and Ruby quadrangles, Alaska: U.S. Geological Survey Open-File Report 81-170, 94 p.
Eakins, G.R., Bundtzen, T.K., Lueck, L.L. Green, C.B., Gallagher, J.L., and Robinson, M.S., 1985, Alaska mineral industry, 1984: Alaska Division of Geological and Geophysical Surveys Special Report 38, 57 p.
Eberlein, G.D., Chapman, R.M., Foster, H.L., and Gassaway, J.S., 1977, Map and table describing known metalliferous and selected nonmetalliferous mineral deposits in central Alaska: U.S. Geological Survey Open-File Report 77-168-D, 132 p., 1 sheet, scale 1:1,000,000.
Green, C.B., Bundtzen, T.K., Peterson, R.J., Seward, A.F., Deagan, J.R., and Burton, J.E., 1989, Alaska's mineral industry, 1988: Alaska Division of Geological and Geophysical Surveys Special Report 43, 79 p.
Mertie, J.B., Jr., 1936, Mineral deposits of the Ruby-Kuskokwim region, Alaska: U.S. Geological Survey Bulletin 864-C, p. 115-245.
Mertie, J.B., Jr., and Harrington, G.L., 1916, Mineral resources of the Ruby-Kuskokwim region, in Brooks, A.H., and others, Mineral Resources of Alaska, Report on Progress of Investigations in 1915: U.S. Geological Survey Bulletin 642-H, p. 223-266.
|Reporters||C.E. Cameron (Alaska Division of Geological and Geophysical Surveys)|
|Last report date||3/22/2000|