|Quadrangle map, 1:250,000-scale||NR|
|Quadrangle map, 1:63,360-scale||C-4|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||Placer mining took place near the mouth of locally-named Bonanza Creek, a short, west-flowing tributary of the Ungalik River approximately 4.5 miles east of the abandoned town of Ungalik. Mining also took place on the Ungalik River (NR009) near the mouth of Bonanza Creek, and nearby at Hopeful Gulch (NR010). The coordinates are for the approximate center of mine tailings marked on the Norton Bay C-4 topographic map. These tailings are in the SE1/4 sec. 7, T. 11 S., R. 10 W. , Kateel River Meridian. Bonanza Creek is location 2 of Cobb (1972 [MF 381]).|
The country rocks in the vicinity of Bonanza Creek include black shale or slate that is cut by Cretaceous granitic dikes. The igneous rock contains sulfides (Smith and Eakin, 1911). The contact zone between the igneous rock and the sedimentary rocks is epidotized and contains fine-grained calcite, chlorite, quartz, amphiboles, pyrite, and magnetite (Anderson, 1944).
Gold occurs both in creek and bench placers; water was pumped from the Ungalik River to facilitate mining. The gold is described as moderately coarse to coarse, and commonly attached to pieces of quartz vein material (Smith and Eakin, 1911). Abundant stibnite and scheelite are also present; during 1918 a few pounds of scheelite were produced (Cobb, 1973 [B 1374]). Other minerals associated with the gold at Bonanza Creek include magnetite, epidote, garnet, apatite, zircon, hornblende, hematite, and augite (Anderson, 1944). Brooks (1911) indicates that the likely source of gold is the contact zone between the igneous and sedimentary rocks.
Gold was discovered near the mouth of Bonanza Creek in 1899, and mining continued until at least 1918 (Smith and Eakin, 1911).Also see NR009 and 010.
|Geologic map unit||(-160.742137670544, 64.544110645304)|
|Mineral deposit model||Placer Au; stream, bench (Cox and Singer, 1986; model 39a)|
|Mineral deposit model number||39a|
|Age of mineralization||Quaternary. The source of the placer gold may be the contact zone between the Cretaceous granitic dikes and the sedimentary rocks (Brooks, 1911).|
|Workings or exploration||Gold was discovered near the mouth of Bonanza Creek in 1899 (Smith and Eakin, 1911) and mined until at least 1918. The mouth of Bonanza Creek empties into the Ungalik River (NR009), where intermittent dredge mining took place until 1987 or 1988 (Bundtzen and others, 1992).|
|Indication of production||Yes; small|
|Production notes||Some gold was produced from Bonanza Creek from 1899 until about 1918. Intermittent gold production continued from the nearby Ungalik River (NR009) until 1987 or 1988 (Bundtzen and others, 1992).|
|MRDS Number||A015701; D002611; D002614|
Anderson, Eskil, 1945, Petrographic descriptions of rocks collected during 1944 field investigation in north-west Alaska, and lists of ore and rock samples and placer concentrates collected in northwestern and interior Alaska during 1945 field season: Alaska Territorial Department of Mines Miscellaneous Report 195-28, 76 p.
Anderson, Eskil, 1947, Mineral occurrences other than gold deposits in northwestern Alaska: Alaska Territorial Division of Mines Pamphlet 5-R, 48 p.
Brooks, A.H., 1910, Mineral resources of Alaska, report on progress of investigations in 1909: U.S. Geological Survey Bulletin 442, 426 p.
Brooks, A.H., 1911, Geologic features of Alaskan metalliferous lodes: U.S. Geological Survey Bulletin 480-C, p. 43-93.
Bundtzen, T.K., Swainbank, R.C., Wood, J.E., Clough, A.H., 1991 (1992), Alaska's Mineral Industry 1991: Alaska Division of Geological & Geophysical Surveys, Special Report 46, 89 p.
Cass, J.T., 1959, Reconnaissance geologic map of the Norton Bay quadrangle, Alaska: U.S. Geological Survey Miscellaneous Investigations Series Map I-286, 1 sheet, scale 1:250,000.
Cobb, E.H., 1976, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Candle, Holy Cross, Norton Bay, Nulato, and Unalakleet quadrangles, Alaska: U.S. Geological Survey Open-File Report 76-866, 102 p.
Joesting, H.R., 1942, Strategic mineral occurrences in interior Alaska: Alaska Territorial Department of Mines Pamphlet 1, 50 p.
Martin, G.C., 1919, Alaska Mining Industry in 1917: U.S. Geological Survey Bulletin 692-A, p. 11-42.
Martin, G.C., 1920, The Alaska mining industry in 1918: U.S. Geological Survey Bulletin 712-A, p. 1-52.
Mendenhall, W.C., 1901, A reconnaissance in the Norton Bay region, Alaska, in 1900, in Brooks, A.H., Richardson, G.B., Collier, A.J., and Mendenhall, W.C., Reconnaissance in the Cape Nome and Norton Bay regions, Alaska, in 1900: U.S. Geological Survey Special Publication, p. 187-218.
Smith, P.S., 1939, Mineral industry of Alaska in 1937: U.S. Geological Survey Bulletin 910-A, p. 1-113.
Smith, P.S., 1939, Mineral industry of Alaska in 1938: U.S. Geological Survey Bulletin 917-A, p. 1-113.
Smith, P.S., 1941, Mineral industry of Alaska in 1939: U.S. Geological Survey Bulletin 926-A, p. 1-106.
Smith, P.S., 1942, Mineral industry of Alaska in 1940: U.S. Geological Survey Bulletin 933-A, p. 1-102.
Smith, P.S., and Eakin, H.M., 1910, Mineral resources of the Nulato-Council region: U.S. Geological Survey Bulletin 442-H, p. 316-352.
|Last report date||8/7/2001|