|Quadrangle map, 1:250,000-scale||BN|
|Quadrangle map, 1:63,360-scale||C-6|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||Kougarok River is the largest and most important drainage in the Kougarok mining district. It drains south from its headwaters in Washington Creek (BN041) and Macklin Creek (BN045) in the northern part of the Bendeleben C-6 quadrangle; it is at least locally gold-bearing over a length of 18 miles in this quadrangle. The part of the Kougarok River included in this locality is the mile upstream and the 7 to 8 miles downstream from the mouth of Taylor Creek. Taylor Creek is a major east tributary to Kougarok River. The mouth of Taylor Creek is 1,000 feet north of the termination of the Nome-Taylor road at Taylor. This part of the Kougarok River includes localities 24 and 25 of Cobb (1972; MF 417; 1975; OFR 75-429).|
Geologic descriptionKougarok River is the largest and most important drainage in the Kougarok mining district. Placer mining started here as early as 1900 when $50,000 worth of gold (about 3,000 ounces at $18 per ounce) were recovered (Brooks and others, 1901). Extensive dredging of the active floodplain has taken place from a mile upstream to 7-8 miles downstream from the mouth of Taylor Creek (Sainsbury and others, 1969). Placer mining, including dredging, has continued locally to the present. Most of the more than 240,000 ounces of known production from the Kougarok district (Hudson and DeYoung, 1977) is from the upper part of Kougarok River. The recovered gold is dark compared to that from tributaries (Collier and others, 1908). Placer concentrates contain cassiterite, abundant pyrite, and magnetite (Knopf, 1908). A gray, sulfide-rich dredge concentrate contained 2,000 ppm Ag, 7,000 ppm Bi, and greater than 10 % Pb (Sainsbury and others, 1969, p. 39). Bedrock in the upper Kougarok River drainage is dominately Lower Paleozoic metasedimentary rocks (Sainsbury and others, 1969; Till and others, 1986). Placer deposits on the active floodplain are the result of two or more cycles of erosion and placer development in the area.
|Geologic map unit||(-164.79169675727, 65.6842756309524)|
|Mineral deposit model||Placer Au-PGE (Cox and Singer, 1986; model 39a)|
|Mineral deposit model number||39a|
|Age of mineralization||Quaternary; placer deposits on the active floodplain are the result of two or more cycles of erosion and placer development in the area.|
|Workings or exploration||The entire length of this segment of the Kougarok River has been extensively placer mined for gold. Sainsbury and others (1969) show where many of these mine workings are located but additional mine tailings are also shown on the USGS 1:63,360 topographic map of the area (Bendeleben C-6 quadrangle). Most of these placer mine workings are the result of dredge operations.|
|Indication of production||Yes; medium|
|Production notes||Brooks (1901) reports initial production at the turn of the century to be $50,000 (about 3,000 ounces at $18 per ounce); this is an indication of the richness of the upper Kougarok River area. Most of the more than 240,000 ounces of known production from the Kougarok district (Hudson and DeYoung, 1978) is from the upper part of Kougarok River.|
Brooks, A.H., Richardson, G.B., Collier, A.J., and W.C. Mendenhall, 1901, A reconnaissance in the Cape Nome and adjacent gold fields of Seward Peninsula, Alaska, in 1900: U.S. Geological Survey Special Publication, p. 1-185, maps.
Cobb, E.H., 1972, Metallic mineral resources map of the Bendeleben quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-417, 1 sheet, scale 1:250,000.
Cobb, E.H., 1975, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Bendeleben quadrangle, Alaska: U.S. Geological Survey Open-File Report 75-429, 123 p.
Collier, A.J., Hess, F.L., Smith, P.S., and Brooks, A.H., 1908, The gold placers of parts of Seward Peninsula, Alaska, including the Nome, Council, Kougarok, Port Clarence, and Goodhope precincts: U.S. Geological Survey Bulletin 328, 343 p.
Hudson, T.L., and DeYoung, J. H., Jr., 1978, Map and tables describing areas of mineral resource potential, Seward Peninsula, Alaska: U.S. Geological Suvey Open-File Report 78-1-C, 62 p., 1 sheet, scale 1:1,000,000.
Knopf, Adolph, 1908, The Seward Peninsula tin deposits: U.S. Geological Survey Bulletin 345-E, p. 251-267.
Sainsbury, C.L., Kachadoorian, Reuben, Hudson, Travis, Smith, T.E., Richards, T.R., and Todd, W.E., 1969, Reconnaissance geologic maps and sample data, Teller A-1, A-2, A-3, B-1, B-2, B-3, C-1, and Bendeleben A-6, B-6, C-6, D-5, and D-6 quadrangles. Seward Peninsula, Alaska: U.S. Geological Survey Open-File Report 69-236, 49 p., 12 sheets, scale 1:63,360.
|Reporters||Travis L. Hudson (Applied Geology)|
|Last report date||3/15/1999|