|Quadrangle map, 1:250,000-scale||TK|
|Quadrangle map, 1:63,360-scale||D-2|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||This placer mine is located on lower Jay Creek; it extends for about 1 mile upstream from the mouth of the creek on the Susitna River. The mine is centered in NW1/4NW1/4 sec. 13, T. 31 N., R. 8 E., Seward Meridian. The location is accurate to within 1/2 mile.|
The Jay Creek placer deposit extends for a mile above the mouth of the creek, in alluvium estimated to be 12 feet thick (Kurtak and others, 1992). The lower part of the creek is underlain by Triassic metabasalt (Schmidt, 2002). The upper portion of the drainage is underlain by Cretaceous-Tertiary granodiorite and tonalite (Csejtey and others, 1978). The Jay Creek mine workings consist of placer tailings and test pits that extend from the mouth upstream for 1 mile. Stream-sediment samples collected with a backhoe by the U.S. Bureau of Mines from the mouth to the head of the creek contain up to 0.001 ounce of gold per cubic yard ; surface samples contain up to 3,300 parts per billion gold and 2 parts per million silver. Suction dredge concentrates contain 1,025 parts per million vanadium and 5.16 percent titanium; samples of alluvium contain up to 80 parts per million tungsten (Balen, 1990; Kurtak and others, 1992).Minor production was reported during 1920-49 and 1987-88 (Balen, 1990). A total of 14 state mining claims were valid as of January 1, 2000 (Northern Associates Inc., written communication , 2001).
|Geologic map unit||(-147.870830689491, 62.780038224422)|
|Mineral deposit model||Placer Au (Cox and Singer, 1986; model 39a)|
|Mineral deposit model number||39a|
|Age of mineralization||Quaternary placer.|
|Workings or exploration||The Jay Creek mine workings consist of placer tailings and test pits that extend from the mouth upstream for 1 mile. Extensive sampling by U.S. Bureau of Mines (Balen, 1990; Kurtak and others, 1992). The mine includes the Rainbow 1-7 claims staked by Black Creek Mining Company? A total of 14 state mining claims were valid as of January 1, 2000 (Northern Associates Inc., written communication, 2001).|
|Indication of production||Yes; small|
|Production notes||Minor production was reported during 1920-49 and 1987-88 (Balen, 1990).|
Additional commentsMAS/MILS number 20760048.
Balen, M.D., 1990, Geochemical sampling results from Bureau of Mines investigations in the Valdez Creek mining district, Alaska: U.S. Bureau of Mines Open-File Report 34-90, 218 p., 2 sheets, scale 1:63,360.
Csejtey, Bela, Jr., Nelson, W.H., Jones, D.L., Silberling, N.J., Dean, R.M., Morris, M.S., Lanphere, M.A., Smith, J.G., and Silberman, M.L, 1978, Reconnaissance geologic map and geochronology, Talkeetna Mountains quadrangle, northern part of Anchorage quadrangle, and southwest part of Healy quadrangle, Alaska: U.S. Geological Survey Open-File Report 78-558-A, 60 p., 1 sheet, scale 1:250,000.
Kurtak, J.M., Southworth, D.D., Balen, M.D., and Clautice, K.H., 1991, Mineral investigations in the Valdez Creek Mining District, south-central Alaska: U.S. Bureau of Mines Open-File Report 1-92, 658 p., 2 sheets, scale 1:250,000.
Schmidt, J.M., Werdon, M.B., and Wardlaw, B., 2003, New mapping near Iron Creek, Talkeetna Mountains, indicates presence of Nikolai Greenstone, in Clautice, K.H., and Davis, P.K., eds., 2003, Short Notes on Alaska Geology 2003: Alaska Division of Geological & Geophysical Surveys Professional Report 120, p. 101-108.
|Reporters||R.K. Rogers (U. S. Geological Survey contractor)|
|Last report date||10/2/2002|