|Quadrangle map, 1:250,000-scale||SR|
|Quadrangle map, 1:63,360-scale||D-6|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||This placer mine is in the N1/2 section 11, T. 9 N., R. 2 E., of the Seward Meridian. Peterson Creek flows southwest into Turnagain Arm between Girdwood and Portage. The mine extends from tidewater to about three-fourths of a mile upstream. This is location 3 of Cobb and Richter (1972), location 3 of MacKevett and Holloway (1977), location 3 of Cobb and Tysdal (1980), and location P-96 of Jansons and others (1984). The location is accurate to within a quarter of a mile.|
Peterson Creek occupies a steep narrow avalanche-debris-filled valley with numerous small waterfalls and cascades. There is little accumulation of alluvial gravels until it approaches tidewater. Bedrock in this area is the Valdez Group of Late Cretaceous age (Nelson and others, 1985) and consists of massive greenstone and greenstone tuff, along with small amount of interbedded shale. The greenstone is typically a dense, fine-grained, green rock enclosing abundant small, angular fragments of slate (Capps, 1916).There has been hand mining and small-scale suction dredging from the mouth of Peterson Creek upstream for about 4,000 feet. Concentrate samples from near the mouth of the Creek contained scheelite, chalcopyrite, native copper, and gold . Total production is less than 800 ounces (Cobb and Tysdal, 1980).
|Geologic map unit||(-149.043865746981, 60.8892247108845)|
|Mineral deposit model||Placer Au (alluvial) (Cox and Singer, 1986; model 39a).|
|Mineral deposit model number||39a|
|Age of mineralization||Quaternary.|
|Workings or exploration||
A hand-sorted rock pile and suction dredge pit remain at the site. Placer mining has yielded less than 800 ounces of gold (Cobb and Tysdal, 1980). A concentrate sample from near the mouth of the creek contained scheelite, chalcopyrite, native copper, and gold. Significant quantities of gold reportedly occur on bedrock and in bedrock fractures, but samples collected by the U.S. Bureau of Mines contained only trace amounts of gold (Jansons and others, 1984).There are also underground workings that were driven by prospectors seeking lode gold (SR052). Two cabins associated with these workings are in the valley above the creek (Capps, 1916).
|Indication of production||Yes; small|
|Production notes||Production is estimated at less than 800 ounces of gold (Jasper, 1967). The U.S. Bureau of Mines reported only minor production (Jansons and others, 1984).|
Berg, H.C., and Cobb, E.H., 1967, Metalliferous lode deposits of Alaska: U.S. Geological Survey Bulletin 1246, 254 p.
Cobb, E.H., and Richter, D.H., 1972, Metallic mineral resources map of the Seward quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-466, 2 sheets, scale 1:250,000.
Cobb, E.H., and Tysdal, R.G., 1980, Summaries of data on and list of references to metallic and selected nonmetallic mineral deposits in the Blying Sound and Seward quadrangle, Alaska: U.S. Geological Survey Open-File Report 80-621, 276 p.
Hoekzema, R.P., and Sherman, G.E., 1983, Mineral investigations in the Chugach National Forest, Alaska (Peninsula study area): U.S. Bureau of Mines in-house report; held at U.S. Bureau of Land Management Alaska State Office, Anchorage, 524 p.
Jansons, Uldis, Hoekzema, R.B., Kurtak, J.M., and Fechner, S.A., 1984, Mineral occurrences in the Chugach National Forest, southcentral Alaska: U.S. Bureau of Mines Mineral Land Assessment 5-84, 218 p., 2 sheets, scale 1:250,000.
Jasper, M.W., 1967, Geochemical investigations, Willow Creek southerly to Kenai Lake region, south central Alaska: Alaska Division of Mines and Minerals Geochemical Report 14, 47 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.
Nelson, S.W., Dumoulin, J. A., and Miller, M.L., 1985, Geologic map of the Chugach National Forest, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-1645-B, 16 p., 1 sheet, scale 1:250,000.
|Reporters||Jeff A. Huber (Anchorage)|
|Last report date||4/8/2000|