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Gold Creek Mine, Valdez Creek District, Matanuska-Susitna Borough, Alaska, USA

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Latitude & Longitude (WGS84): 62° 13' 50'' North , 147° 44' 27'' West
Latitude & Longitude (decimal): 62.23056,-147.74083


MAS/MIL number 20760021.
Location: The mine is a placer on the middle fork of upper Gold Creek, a tributary of the Oshetna River. Mining cuts on the creek are at elevations of about 4, 500 feet in the Talkeetna Mountains A-2 quadrangle, and about 3,200 feet in the Talkeetna Mountains B-2 quadrangle. The site is arbitrarily located at the 4,500-foot cut in the NW1/4 sec. 26, T. 25 N., R. 9 E., Seward Meridian. The location is accurate to within 1/4 mile. This is location 56 of Csejtey and Miller (1978).
Geology: Alluvial gravels in Gold Creek overlie volcaniclastic breccia, porphyritic basalt, andesite, felsic tuff, sandstone, and argillite of the Jurassic Talkeetna Formation (Kurtak and others, 1992). The ridge west of the creek consists of Tertiary fluviatile conglomerate overlain by Tertiary volcanic rocks. The creek gravels are up to 50 feet thick and average 15 feet thick; the gradient of the creek is about 100 to 200 feet per mile (Kurtak and others, 1992). In addition to gold, the concentrates contain garnet, magnetite, and psilomelane. Placer samples collected by the U.S. Bureau of Mines contain up to 3.1 parts per million platinum and up to 0.0043 ounce of gold per cubic yard (Kurtak and others, 1992). The gold fineness varies from 770 to 850. Several placer claims are on Gold Creek, some staked as recently as 1980 (Kurtak and others, 1992). Mining cuts are at elevations of about 4,500 and 3, 200 feet. Coarse gold was reported to have been found in 1914 (Chapin, 1918). Suction dredging occurred in 1975 and a small placer mine operated in 1976.
Workings: Several placer claims are on Gold Creek, some staked as recently as 1980 (Kurtak and others, 1992). Mining cuts are at elevations of about 4,500 and 3, 200 feet. Coarse gold was reported to have been found in 1914 (Chapin, 1918). Suction dredging occurred in 1975 and a small placer mine operated in 1976. Limited placer samples collected by the U.S. Bureau of Mines (Kurtak and others, 1992).
Age: Quaternary placer.
Production: Suction dredging occurred in 1975 and a small placer mine operated in 1976. The amount of gold recovered has not been made public.
Reserves: An estimated 1 million cubic yards of potentially auriferous placer gravel are in the basin of Gold Creek (Kurtak and others, 1992). There are no estimates of the grade.

Commodities (Major) - Au; (Minor) - Pt
Development Status: Yes; small
Deposit Model: Placer Au-PGE (Cox and Singer, 1986; model 39a)

Mineral List


2 valid minerals.

Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on Macrostrat.org

Early Jurassic
174.1 - 201.3 Ma
Talkeetna Formation

Age: Early Jurassic (174.1 - 201.3 Ma)

Description: Andesitic flows, flow breccia, tuff, and agglomerate; subordinate interbeds of sandstone, siltstone, and limestone. A dominantly shallow marine sequence about 1000 to 2000 m thick

Lithology: Igneous

Reference: Wilson, F.H., Hults, C.P., Mull, C.G, and Karl, S.M. (compilers). Geologic map of Alaska. doi: 10.3133/sim3340. U.S. Geological Survey Scientific Investigations Map 3340, pamphlet 196. [21]

Early Jurassic
174.1 - 201.3 Ma
Igneous: extrusive; Extrusive: undivided

Age: Early Jurassic (174.1 - 201.3 Ma)

Description: Okhotsk, Bering Sea, Pacific Alaska, Alaska Range

Comments: Orogen, magmatic arc/suite; Wilson & Hults, unpublished compilation, 2007-08

Lithology: Volcanic rocks; lava flows, pyroclastic debris or metamorphosed equivalent

Reference: J.C. Harrison, M.R. St-Onge, O.V. Petrov, S.I. Strelnikov, B.G. Lopatin, F.H. Wilson, S. Tella, D. Paul, T. Lynds, S.P. Shokalsky, C.K. Hults, S. Bergman, H.F. Jepsen, and A. Solli. Geological map of the Arctic. doi:10.4095/287868. Geological Survey of Canada Map 2159A. [2]

Data and map coding provided by Macrostrat.org, used under Creative Commons Attribution 4.0 License



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References

Balen, M.D., 1990, Geochemical sampling results from the Bureau of Mines investigations in the Valdez Creek mining district, Alaska: U.S. Bureau of Mines Open-File Report 34-90, 218 p., 2 plates, scale 1:250,000. Chapin, Theodore, 1915, Auriferous gravels of the Nelchina-Susitna region: U.S. Geological Survey Bulletin 622-D, p. 118-130. Chapin, Theodore, 1918, The Nelchina-Susitna region, Alaska: U.S. Geological Survey Bulletin 668, 67 p. Cobb, E.H., 1972, Metallic mineral resources map of the Talkeetna Mountains quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-370, 1 sheet, scale 1:250,000. Cobb, E.H., and Csejtey, Bela, Jr., 1980, Summaries of data on and lists of references to metallic and selected nonmetallic mineral deposits in the Talkeetna Mountains quadrangle, Alaska: U.S. Geological Survey Open-File Report 80-716, 63 p. Csejtey, Bela, Jr., and Miller, R.J., 1978, Map and table describing metalliferous and selected nonmetalliferous mineral deposits in the Talkeetna Mountains quadrangle, Alaska: U.S. Geological Survey Open-File Report 78-558-B, 22 p., 1 sheet, scale 1:250,000. 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., 1992, Mineral investigations in the Valdez Creek mining district, south-central Alaska: U.S. Bureau of Mines Open-File Report 1-92, 659 p., 2 plates, scale 1:250,000. 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. Singer, D.A., Csejtey, Bela, Jr., and Miller, R.J., 1978, Map and discussion of the metalliferous and selected non-metalliferous mineral resources of the Talkeetna Mountains quadrangle, Alaska: U.S. Geological Survey Open-file Report 78-588-Q, 33 p., 1 sheet, scale 1:250,000.

 
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