|Quadrangle map, 1:250,000-scale||SM|
|Quadrangle map, 1:63,360-scale||D-4|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||The Ammiline prospect is on a west-facing slope of Parks Creek, about 0.6 mile north-northeast of the mouth of Parks Creek. It is at an elevation of about 430 feet in the SE1/4 sec. 24, T. 20 N., R. 45 W., of the Seward Meridian. The prospect is locality 11 of Miller and others (1989).|
Geologic descriptionAt the Ammiline prospect, cinnabar and minor stibnite in a gangue of fine-grained silica occurs along fractures in an albite rhyolite or granite porphyry dike that intrudes shale and sandstone of the Upper Cretaceous, Kuskokwim Group (Cady and others, 1955; Sainsbury and MacKevett, 1965). The Ammiline prospect is geologically similar to the Fairview prospect (SM019). No other information is available.
|Geologic map unit||(-157.348049930955, 61.8027602256168)|
|Mineral deposit model||Silica-carbonate mercury (Cox and Singer, 1986; model 27c).|
|Mineral deposit model number||27c|
|Age of mineralization||Undated; the nearby Fairview prospect (ARDF SM019) has a 40Ar/39Ar age of 72.6 Ma (Gray, Gent, and others, 1997).|
|Alteration of deposit||Albitization of the rhyolite host rock.|
|Indication of production||None|
Cady, W.M., Wallace, R.E., Hoare, J.M., and Webber, E.J., 1955, The central Kuskokwim region, Alaska: U.S. Geological Survey Professional Paper 268, 132 p.
Cobb, E.H., 1972, Metallic mineral resources map of the Sleetmute quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-368, 1 sheet, scale 1:250,000.
Cobb, E.H., 1976, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Dillingham, Sleetmute, and Taylor Mountains quadrangles, Alaska: U.S. Geological Survey Open-File Report 76-606, 92 p.
Gray, J.E., Gent, C.A., Snee, L.W., and Wilson, F.H., 1997, Epithermal mercury-antimony and gold-bearing vein lodes of southwest Alaska, in Goldfarb, R.J., and Miller, L.D., eds., Mineral Deposits of Alaska: Economic Geology Monograph 9, p. 287-305.
Miller, M.L., Belkin, H.E., Blodgett, R.B., Bundtzen, T.K., Cady, J.W., Goldfarb, R.J., Gray, J.E., McGimsey, R.G., and Simpson, S.L., 1989, Pre-field study and mineral resource assessment of the Sleetmute quadrangle, southwestern Alaska: U.S. Geological Survey Open-File Report 89-363, 115 p., 3 plates, scale 1:250,000.
|Reporters||T.K. Bundtzen (Pacific Rim Geological Consulting, Inc.) and M.L. Miller (U.S. Geological Survey)|
|Last report date||5/3/2003|