|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||Seattle Creek is located in T. 9 N., R. 1 and 2 E., of the Seward Meridian. The map site is in the S1/2 section 18, T. 9 N., R. 2 E. The location is accurate to 300 feet. The placer workings are about one mile upstream from the mouth the creek. This is location 8 of MacKevett and Holloway (1977), location 8 of Cobb and Tysdal (1980), and location P-70 of Jansons and others (1984).|
The bedrock in this area has been mapped as sedimentary rock of the Valdez Group of Late Cretaceous age (Nelson and others, 1985). Seattle Creek occupies a long, fairly narrow U-shaped valley and has a narrow bedrock canyon.
Gold occurs throughout the channel gravels, but it is mostly concentrated on bedrock. Some small areas of bench gravels exist in the lower part of the creek; these contain disseminated gold that occurs in sandy, boulder-rich gravel resting on a 6- to 12-inch-thick clay layer (Jansons and others, 1984). The gold in both the bench and channel deposits is fairly fine, although particles as long as three-sixteenths of an inch have been recovered.The U.S. Bureau of Mines collected six suction-dredge samples of bench and channel gravels in 1979. These samples contained 0.0136 to 0.0316 ounce of gold per yard (Jansons and others, 1984).
|Geologic map unit||(-149.16416401267, 60.8653302305228)|
|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 hydraulic pit is on the west side of the Seattle Creek about one mile south of Turnagain Arm along with a few hand workings and suction dredge pits scattered along the creek. The U.S. Bureau of Mines collected six suction dredge samples of bench and channel gravels in 1979. These samples contained 0.0136 to 0.0316 ounce of gold per yard (Jansons and others, 1984).|
|Indication of production||Yes; small|
|Reserve estimates||There are more than 250,000 cubic yards of gravel in the lower part of Seattle Creek that have moderate mineral potential (Jansons and others, 1984).|
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.
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., 1906, Gold fields of the Turnagain Arm region: U.S. Geological Survey Bulletin 277, p. 7-52.
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||3/7/2000|