Mine detail: Roosevelt Hills

Previously called ''

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Location

Lat / long: 64.02157, -151.50494

Resource(M)

Primary: Tin, Silver
Ore: Pyrite
Gangue: Coronadite, Fluorite, Quartz, Sericite, Tourmaline

Production

Operation type: Unknown
Development status: Prospect

Geology

Alteration processes:Numerous shear zones in granite are silicified and sericitized and contain a black coating in vugs and on joint surfaces. According to x-ray fluorescence analysis, this coating is coronodite: (Mn, Pb)Mn3O7. Burleigh (1989 [DLR 90-24]) inferred that the coating could be from downward-percolating supergene fluids.

References

DEP10307707
Reference{Deposit:: Cobb, E.H., 1977, Placer deposit map of central Alaska: U.S. Geological Survey Open-File Report 77-168B, 64 p., 1 map, scale 1:1,000,000.}{Deposit:: Chapman, R.M., and Yeend, W., 1981, Geologic reconnaissance of the east half of the Kantishna River quadrangle and adjacent areas, in Albert, N.R.D., and Hudson, T., eds, The United States Geological Survey in Alaska, Accomplishments during 1979: U.S. Geological Survey Circular 823-B, 149 p.}{Deposit:: 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.}{Deposit:: Bond, James, 1985, Geologic field examinations in Doyon Limited, regional selection block 9: Doyon Limited Report 85-19, 179 p. (Report held by Doyon, Ltd., Fairbanks, Alaska).}{Deposit:: Clautice, K.H., Bowman, N.D., Clough, J.G., Gilbert, W.G., Kline, J.T., Smith, T.E., and Blodgett, R.B., 1993, Land selection Unit 8 (Kantishna River, Ruby, and Medfra quadrangles): References, lead isotope, geochemical and major oxide data: Alaska Division of Geological and Geophysical Surveys, 42 p., 1 sheet, scale 1:250,000.}
ReporterCameron S. Rombach