|Quadrangle map, 1:250,000-scale||CI|
|Quadrangle map, 1:63,360-scale||B-5|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||The location is the approximate center of mining activity along Hope Creek. Mining activity occurred at several locations along the creek, specifically at 65.40 N, 146.32 W and 65.40 N , 146.36 W. Hope Creek is a tributary to Faith Creek.|
Bedrock exposure is rare in the Hope Creek area, except on ridgetops, and locally along creeks. Micaceous quartzite, typically weathering to massive slabs and blocks, is the most abundant rubble and forms most of the bedrock outcrops. White, sulfide-free, quartz lenses, segregations and veinlets are common in the quartzite. Quartz-mica schist and pelitic schist also form some outcrops. Nonfoliated hornblende quartz monzonite occurs as small bodies in Hope Creek drainage. The rock varies in composition between quartz monzonite and monzogranite. Hornblende quartz monzonite is commonly altered to chlorite-ankerite-sericite with or without pyrite. Fluorite and garnet are occasionally present. Alteration occurs both along plutonic contacts and along shear zones within the plutons. Numerous cobbles and boulders of sulfide-bearing hornfels occur in Hope Creek. Samples of sulfide-bearing hornfels and quartz-monzonite north of Hope Creek are strongly anomalous in As (up to 7,000 ppm) and Au (up to 550 ppb) and moderately anomalous in Sb (up to 120 ppb). Sulfide-bearing hornfels and quartz monzonite samples from south of Hope Creek are also anomalous in these elements with maximum values of 53 ppm As, 43 ppb Au, and 29 ppb Sb. Virtually no mineralization was observed in metamorphic rocks away from plutonic contacts. In summary, sulfide-bearing hornfels and altered quartz monzonite samples near hornblende quartz monzonite contacts are the most gold-rich rocks found in the Hope Creek drainage. (Swainbank and Burton, 1987, p. 6-19 to 6-22)Placer gold was found in stream gravel, apparently in subeconomic amounts. Stibnite deposits were reportedly found in 1926, but were apparently reburied by 1942 (Joesting, 1943, p. 12).
|Geologic map unit||(-146.356471205555, 65.3996031644972)|
|Mineral deposit model||Placer gold deposit (Cox and Singer, 1986; model 39a); Gold-rich sulfide-bearing hornfels and quartz monzonite.|
|Mineral deposit model number||39a|
|Workings or exploration||Placer gold was discovered in the early 1900s but was never mined extensively (Menzie and others, 1983, p. 46).|
|Indication of production||Undetermined|
Additional commentsSee also Faith Creek, ARDF no. CI018.
|MRDS Number||A012221; D002674|
Brooks, A.H., 1907, The Alaskan mining industry in 1906: U.S. Geological Survey Bulletin 314-A, p. 19-39.
Burand, W.M., 1965, A geochemical investigation between Chatanika and Circle hot springs, Alaska: Alaska Division of Mines and Minerals Geochemical Report 5, 11 p.
Cobb, E.H., 1972, Metallic mineral resources map of the Circle quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-391, 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 Circle quadrangle, Alaska: U.S. Geological Survey Open-File Report 76-633, 72 p.
Joesting, H.R., 1943, Strategic mineral occurrences in interior Alaska, supplement to pamphlet No. 1: Alaska Territorial Department of Mines Pamphlet 2, 31 p.
Lampright, R.L., 1996, Gold placer deposits near Fairbanks Alaska--An inventory of the gold placer mines, prospects, and deposits located within the Big Delta Charley River, Circle, Eagle, Fairbanks, and Livengood quadrangles: Nederland, Colorado, Iron Fire Publications, Anchorage, Alaska, 135 p.
Menzie, W.D., Foster, H.L., Tripp, R.B., and Yeend, W.E., 1983, Mineral resource assessment of the Circle quadrangle, Alaska: U.S. Geological Survey Open-File Report 83-170-B, 61 p., 1 sheet, 1:250,000.
Nelson, A.E., West, W.S., and Matzko, J.J., 1954, Reconnaissance for radioactive deposits in eastern Alaska, 1952: U.S. Geological Survey Circular 348, 21 p.
Prindle, L.M., 1908, The Fairbanks and Rampart quadrangles, Yukon-Tanana region, Alaska, with a section on the Rampart placers, by F.L. Hess, and a paper on the water supply of the Fairbanks region, by C.C. Covert: U.S. Geological Survey Bulletin 337, 102 p.
Prindle, L.M., and Katz, F.J., 1913, Detailed description of the Fairbanks district, in Prindle, L.M., A geologic reconnaissance of the Fairbanks quadrangle, Alaska: U.S. Geological Survey Bulletin 525, p. 59-152.
Swainbank, R.C., and Burton, P. J., 1987, Mineral assessment of the Lime Peak-Mt. Prindle area, Alaska, in Smith, T.E., Pessel, G.H., Wiltse, M.A., 1987, Mineral assessment of the Lime Peak-Mt. Prindle area, Alaska: Alaska Division of Geological & Geophysical Surveys, Miscellaneous Publication 29, p. 2.27-2.41
Wedow, Helmuth, Jr., 1953, Preliminary summary of reconnaissance for uranium and thorium in Alaska, 1952: U.S. Geological Survey Circular 248, 15 p.
|Reporters||C.J. Freeman, J.R. Guidetti Schaefer, A.S. Clements (Avalon Development Corporation)|
|Last report date||9/9/1998|