|Quadrangle map, 1:250,000-scale||GU|
|Quadrangle map, 1:63,360-scale||D-1|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||Hidden Creek (Cobb, 1979 [OF 79-1247, p. 13]), is a south-flowing tributary to Flat Creek. It has been actively prospected about one-quarter mile north of the lake in the Flat Creek valley (Richter, 1966, fig. 5). Hidden Creek is locality 20 of Richter and Matson (1972) and locality 19 of MacKevett and Holloway (1977). It lies along the section line at the bottom center of the SW1/4, section 6, T. 11 N., R. 7 E., Copper River Meridian.|
The rocks in the area consist of Pennsylvanian to Permian volcanics of the Tetelna Formation that are intruded by monzonitic rocks of the Pennsylvanian to Permian, Ahtell pluton. The contact is broad and low angle; the Teteltna rocks form a roof cap over the pluton along Hidden Creek (Richter, 1966).Little is known about this placer deposit. The area was prospected in the early 1900s; it was restaked and prospected again after the discovery of the placer in Grubstake Gulch in 1934 (Moffit, 1938, p. 51). The placer prospect is about 3 miles below the Elizabeth, molybdenum-porphyry deposit (GU025). This porphyry was apparently not sampled systematically for gold, but Richter and Matson (1968) reported one highly anomalous stream-sediment sample with 300 ppb Au in the valley of Hidden Creek below the Elizabeth deposit and about 2.5 miles above the placer workings in Hidden Creek.
|Geologic map unit||(-144.162189772843, 62.7596056542321)|
|Mineral deposit model||Placer Au (Cox and Singer, 1986; model 39a)|
|Mineral deposit model number||39a|
|Age of mineralization||Holocene placer.|
|Workings or exploration||Small placer operation (Moffit, 1938; Richter, 1966).|
|Indication of production||Yes|
|Production notes||Probably minor .|
Cobb, E.H., 1979, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Gulkana quadrangle, Alaska: U.S. Geological Survey Open-File Report 79-1247, 36 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.
Moffit, F.H., 1938, Geology of the Slana-Tok district, Alaska: U.S. Geological Survey Bulletin 904, 54 p.
Richter, D.H., 1966, Geology of the Slana district, southcentral Alaska: Alaska Division of Geological and Geophysical Surveys Geological Report 2l, 54 p., 3 sheets, scale 1:63,360.
Richter, D.H., and Matson, N.A., Jr., 1972, Metallic mineral resources map of the Gulkana quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-419, 1 sheet, scale 1:250,000.
WGM Inc., 1980, 1979 Summary report of gold potential, Slana District, Ahtna project: WGM Inc., 10 p., map, scale 1:63,360. (Report held by Ahtna Mineral Co., Anchorage, Alaska).
|Reporters||W.T. Ellis (Alaska Earth Sciences), C.C. Hawley (Hawley Resource Group), and W.J. Nokleberg (U.S. Geological Survey)|
|Last report date||12/4/2000|