|Quadrangle map, 1:250,000-scale||RB|
|Quadrangle map, 1:63,360-scale||C-5|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||Ruby Creek is a north-flowing tributary of the Yukon River, with the town of Ruby at the confluence. The coordinates given correspond to location 2 of Cobb (1972 [MF405]) and mark the midpoint of placer grounds lying on a bench to the east of the creek. The workings are near the mouth of the creek, in section 4, T. 9 S., R. 17 E. of the Kateel River meridian. The location is accurate.|
Bedrock near the mouth of Ruby Creek is limestone, slate, and schist (Maddren, 1909). Unconsolidated deposits include muck, loamy sand, schist and slate pebbles, diabase cobbles, and rounded diorite boulders 12 to 18 inches in diameter (Maddren, 1909). Vein quartz boulders and a small amount of cassiterite are present in stream gravels (Eakin, 1914 [B578]; Mertie and Harrington, 1916; Chapman and others, 1963). The gold is found at a depth of about 25 feet in discontinuous, thin, sandy layers in gravel (Maddren, 1909). The placer deposits are confined to a small bench on the right side of the stream near the mouth (Eakin, 1914).Ruby Creek is the site of the first placer gold discovered in the Ruby mining district; gold was found along the creek in 1907 (Eakin, 1914 [B578]; Brooks, 1908). Mining began in 1908 and continued until about 1915 (Eberlein and others, 1977). Between these years, about 970 ounces of gold were recovered from the creek (Cobb and Chapman, 1981). Additional intermittent mining took place at least until 1988 (Bundtzen and others, 1986; Green and others, 1989).
|Geologic map unit||(-155.491092415254, 64.7357985807134)|
|Mineral deposit model||Placer Au (Cox and Singer, 1986; model 39a).|
|Mineral deposit model number||39a|
|Age of mineralization||Quaternary.|
|Workings or exploration||Small-scale mining took place along Ruby Creek between 1907 and 1915 (Eberlein and others, 1977). Additional intermittent mining took place up until at least 1988 (Bundtzen and others, 1986; Green and others, 1989).|
|Indication of production||Yes; small|
|Production notes||Between 1907 and 1915, about $10,000 in gold (at $20.67 per ounce) was recovered from Ruby Creek (Eberlein and others, 1977), amounting to 970 ounces of gold (Cobb and Chapman, 1981).|
Bundtzen, T.K., Eakins, G.R., Green, C.B., and Lueck, L.L., 1986, Alaska's mineral industry, 1985: Alaska Division of Geological and Geophysical Surveys Special Report 39, 68 p.
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.
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.
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.
Maddren, A.G., 1909, Gold placers of the Ruby Creek district: U.S. Geological Survey Bulletin 379-E, p. 229-233.
|Reporters||C.E. Cameron (Alaska Division of Geological and Geophysical Surveys)|
|Last report date||3/22/2000|