|Quadrangle map, 1:250,000-scale||ID|
|Quadrangle map, 1:63,360-scale||A-7|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||Gold has been found on the upper part of Girl Creek for about 1.0 mile. The coordinates are at about the center of the occurrence at an elevation of about 1,000 feet in the SW 1/4 sec. 9, T. 13N., R. 51W., of the Seward Meridian. The occurrence is locality 36 of Miller and others (1989). The location is accurate.|
Cady and others (1955) cite reports of placer gold prospects on Girl Creek. The rocks in the area consist of shale and sandstone of the Upper Cretaceous, Kuskokwim Group, siliceous sedimentary rocks of the Mesozoic Gemuk Group;, and an extensive swarm of mafic to felsic dikes and sills similar to those associated with placer deposits in other parts of the Kuskokwim mineral belt (Bundtzen and Miller, 1997).
Girl Creek occupies a nearly straight, northeast-striking, steep-walled canyon that was mapped by Cady and others (1955) as a high angle fault, an interpretation confirmed by more recent mapping (M.L. Miller, D. Bradley, and T.K. Bundtzen, written communication, 2002). Massive slump blocks that occur along the canyon suggest that the Girl Creek fault has been active recently.Panned concentrates from three sites along the the creek contain scheelite, abundant cinnabar, small grains of gold, magnetite, and ilmenite (T.K. Bundtzen, written communication, 1999). Sulfide-bearing tourmaline breccias was observed in outcrops along the north side of the Girl Creek canyon (T.K. Bundtzen and M.L. Miller, unpublished field data, 1999).
|Geologic map unit||(-158.448886056601, 61.2278754421767)|
|Mineral deposit model||Placer Au (Cox and Singer, 1986; model 39a).|
|Mineral deposit model number||39a|
|Age of mineralization||Undated, but probably Quaternary.|
|Workings or exploration||Surface prospecting took place prior to 1951 (Cady and others, 1955). In 1999, one of the compilers of this site (Bundtzen) collected three panned concentrate samples here.|
|Indication of production||None|
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.
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.
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||5/6/2003|