|Quadrangle map, 1:250,000-scale||TL|
|Quadrangle map, 1:63,360-scale||C-2|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||Clark and Cobb (1972, locality 28) and MacKevett and Holloway (1977, locality 27) show the Ruby Gulch mine in a small tributary near the head of Willow Creek, and about 0.6 miles north-northwest of the Willow Creek occurrence (TL042) in the south half of Section 19, T. 29 N., R. 8 W., of the Seward Meridian.|
Geologic descriptionRuby Gulch, a small tributary near the head of Willow Creek, cuts the contact between Mesozoic marine sedimentary rocks (KJs) and continentally derived Pliocene conglomerate of the Sterling (?) Formation (Tps) mapped by Reed and Nelson (1980). Mertie (1919) describes the placer deposit as 4 feet of gravel on bedrock of Tertiary continental deposits. He reports that mining at the site in 1917 recovered a little fine, flaky platinum with the gold.
|Geologic map unit||(-150.842288431326, 62.5794817715053)|
|Mineral deposit model||Placer Au-PGE (Cox and Singer, 1986; model 39a).|
|Mineral deposit model number||39a|
|Age of mineralization||Pleistocene.|
|Workings or exploration||The drainage has been prospected and mined by various small scale surface methods. No other data is available.|
|Indication of production||Yes|
|Production notes||Mertie (1919) describes the placer deposit as 4 feet of gravel on bedrock of Tertiary continental deposits. He reports that mining at the site in 1917 recovered a little fine, flaky platinum with the gold.|
Additional commentsAlso see Willow Creek (TL042).
Clark, A.L., and Cobb, E.H., 1972, Metallic mineral resources map of the Talkeetna quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-369, 1 sheet, scale 1:250,000.
Clark, A.L., and Hawley, C.C., 1968, Reconnaissance geology, mineral occurrences, and geochemical anomalies of the Yentna district, Alaska: U.S. Geological Survey Open-File Report 68-35, 64 p.
Cobb, E.H., and Reed, B.L., 1980, Summaries of data on and lists of reference to metallic and selected nonmetallic mineral deposits in the Talkeetna quadrangle, Alaska: U.S. Geological Survey Open-File Report 80-884, 106 p.
MacKevett, E.M., Jr., and Holloway, C.D., 1977, Map showing metalliferous and selected non-metalliferous mineral deposits in the eastern part of southern Alaska: U.S. Geological Survey Open-File Report 77-169-A, 99 p., 1 sheet, scale 1:1,000,000.
Mertie, J.B., Jr., 1919, Platinum-bearing gold placers of the Kahiltna Valley, in Martin, G.C., and others, Mineral resources of Alaska, report on progress of investigations in 1917: U.S. Geological Survey Bulletin 692, p. 233-264.
Reed, B.L., and Nelson, S.W., 1980, Geologic map of the Talkeetna quadrangle: U.S. Geological Survey Miscellaneous Investigations Map I-1174, 1 sheet, scale 1:250,000.
|Reporters||Madelyn A. Millholland (Millholland & Associates)|
|Last report date||8/10/1998|