|Quadrangle map, 1:250,000-scale||MD|
|Quadrangle map, 1:63,360-scale||A-6|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||The Cloud occurrence is located on a northeast facing spur of Cloudy Mountain at an elevation af approximately 2,400 feet (731 m) in Section 27, T. 26 S., R. 15 E., of the Kateel River Meridian. The prospect is located to within 1,000 feet (300 m).|
Geologic descriptionThe geologic description is sketchy and based on a brief industry report (Anaconda Minerals Company, written communication, 1984). The Cloud prospect is not as well documented as the Win (MD060), Won-North (MD021), Won-South (MD024), and Gemini (MD023) tin-silver prospects in the Medfra quadrangle. The Cloud prospect consists of quartz-tourmaline (cassiterite-arsenopyrite-complex Pb-Sb-Zn-Ag sulfosalt) veins in hornfels about 2,000 feet (600 m) from the contact with a small monzonite stock. Vein orientations and dimensions were not given. The hornfels is thermally altered Kuskokwim Group of Upper Cretaceous age (Patton and others, 1980). Age is judged to be Late Cretaceous-early Tertiary, based on dated, genetically related intrusives nearby (Bundtzen and Miller, 1997). No specific assay data is available for this summary.
|Geologic map unit||(-155.979359852317, 63.2003808601577)|
|Mineral deposit model||Tin polymetallic vein (Cox and singer, 1986; model 20b).|
|Mineral deposit model number||20b|
|Age of mineralization||Age is judged to be Late Cretaceous-early Tertiary, based on dated, genetically related intrusives nearby (Bundtzen and Miller, 1997).|
|Workings or exploration||The prospect area was discovered in 1983 by Duval Corporation while following up stream sediment anomaly data released by the U.S. Geological Survey (King and others, 1980; 1983; Patton and others, 1980). No specific assay data is available.|
|Indication of production||None|
Additional commentsSee: Won - North (MD021), Won - South (MD024), Win (MD060), and Gemini (MD023) prospects.
Bundtzen, T.K., and Miller, M.L., 1997, Precious metals associated with Late Cretaceous-early Tertiary igneous rocks of southwestern Alaska, in Goldfarb, R.J., and Miller, L.D., eds., Mineral Deposits of Alaska: Economic Geology Monograph 9, p. 242-286.
King, H.D., Cooley, E.F., and Spiesman, D.L., 1983, Distribution of gold and silver in nonmagnetic and magnetic heavy mineral concentrate and minus 80 mesh stream sediment samples and ash of aquatic bryophyte samples, Medfra quadrangle, Alaska: U.S. Geological Survey Open-File Report 80-811K.
King, H.D., Risoli, D.A., and Galland, W.W., 1983, Distrbution and abundance of molybdenum, tin, and tungsten in heavy mineral concentrate samples, Medfra quadrangle, Alaska: U.S. Geological Survey Open File Report 80-811J.
King, H.D., Risoli, D.A., Cooley, E.F., O'Leary, R.M., Speckman, W.A., Speisman, D.L., and Galland, D.W., 1980, Final results and statistical summary of analyses of geochemical samples from the Medfra quadrangle, Alaska: U.S. Geological Survey Open-File Report 80-811F, 134 pages.
|Reporters||Bundtzen, T.K. (Pacific Rim Geological Consulting)|
|Last report date||6/3/1998|