|Quadrangle map, 1:250,000-scale||SR|
|Quadrangle map, 1:63,360-scale||B-8|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||The Kenai River in the Seward quadrangle is located in T. 5 N., R. 3, 4 W., of the Seward Meridian. The placer section of the river is between Cooper Creek and Schooner Bend. The map site location is in the Kenai River at its juncture with Cooper Creek, in the NW1/4 section 31, T. 5 N., R. 3 W. of the Seward Meridian where most of the production has occurred from. This is location 26 of Cobb and Tysdal (1980) and location P-87 of Jansons and others (1984). This location is accurate to within 300 feet.|
Geologic descriptionSediments of the upper Kenai River contain minor amounts of gold in a section of the river that runs from Cooper Creek to Schooner Bend. The metasedimentary bedrock in the area is mapped as Valdez Group of Late Cretaceous age (Cobb and Tysdal, 1980). Tysdal (1978 [MF-880-B]) reported that production has come, mainly, from just below Cooper Creek where the river has incised about 190 feet into a glaciolacustrine delta. At this site, most of the gold is fine flakes found in point bars and in bedrock fractures. Coarser gold, flat but not flaky, has been introduced into the river gravels from Cooper Creek. Tysdal (1978 [MF-880-B]) estimated production at less than 769 fine ounces. The U.S. Bureau of Mines estimated production at less than 200 ounces (Jansons and others, 1984).
|Geologic map unit||(-149.882756547658, 60.4847247858681)|
|Mineral deposit model||Placer Au (alluvial) (Cox and Singer, 1986; model 39a).|
|Mineral deposit model number||39a|
|Age of mineralization||Quaternary; the gold is in glaciolacustrine sediments.|
|Workings or exploration||
The Russian explorer Doroshin prospected the area in 1848 and 1850; placer gold was discovered in tributaries to the Kenai River in 1848 (Johnson, 1912). In 1910, Cunningham discovered placer gold in the Kenai River about a mile below Cooper Creek. A small bucket line dredge operated during 1911 and 1912. Production grade from this operation was 0.004 ounce of gold per cubic yard. The dredge operation was not economic. Prospecting using dozers and drilling occurred between 1935 and 1956. Only recreation panning has occurred recently.The U.S. Bureau of Mines collected three point bar gravel samples just above Schooner Bend that assayed from 0.0135 to 0.0449 ounce of gold per cubic yard (Jansons and others, 1984). Jansons and others (1984) estimated total production at less than 200 ounces of gold.
|Indication of production||Yes; small|
|Production notes||Tysdal (1978 [MF-880-B]) estimated production at less than 769 fine ounces. The U.S. Bureau of Mines estimated total production at less than 200 ounces of gold (Jansons and others, 1984).|
Additional commentsThe first gold discovered on the Kenai Peninsula was by the Russian explorer Doroshin on tributaries of the Kenai River in 1848.
Brooks, A.H., 1913, Mineral resources of Alaska, report on progress of investigations in 1912: U.S. Geological Survey Bulletin 542, 308 p.
Brooks, A.H., 1914, Mineral resources of Alaska; report on progress of investigations in 1913: U.S. Geological Survey Bulletin 592, 413 p.
Brooks, A.H., 1915, Mineral resources of Alaska; report on progress of investigations in 1914: U.S. Geological Survey Bulletin 622, 380 p.
Brooks, A.H., 1916, Mineral resources of Alaska, report on progress of investigations in 1915: U.S. Geological Survey Bulletin 642, 279 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.
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.
Johnson, B.L., 1912, Mineral resources of Alaska, report on progress of investigations in 1911--Gold deposits of the Seward-Sunrise region, Kenai Peninsula: U.S. Geological Survey Bulletin 520-E, p. 131-173.
Koschmann, A.H., and Bergendahl, M.H., 1968, Principal gold producing districts of the United States: U.S. Geological Survey Professional Paper 610, 283 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.
Martin, G.C., Johnson, B.L., and Grant, U.S., 1915, Geology and mineral resources of Kenai Peninsula, Alaska: U.S. Geological Survey Bulletin 587, 243 p.
Mendenhall, W.C., 1900, A reconnaissance from Resurrection Bay to the Tanana River, Alaska, in 1898, in Walcott, C.D., Twentieth annual report of the United States Geological Survey, 1898-1899: Part VII - explorations in Alaska in 1898: U.S. Geological Survey Annual Report 20-VII, p. 265-340.
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.
Smith, P.S., 1941, Mineral industry of Alaska in 1939: U.S. Geological Survey Bulletin 926-A, p. 1-106.
|Reporters||Jeff A. Huber and Carol S. Huber (Anchorage)|
|Last report date||1/28/2002|