Hopeful Gulch Prospect, Koyuk District, Nome Borough, Alaska, USA
This page is currently not sponsored. Click here to sponsor this page.
Geology: The country rocks in the vicinity of Hopeful Gulch consist of Cretaceous, medium to fine-grained, mottled, dark gray diorite composed mostly of quartz, feldspar, and biotite. Disseminated pyrite is also present (Anderson, 1944). Anderson (1944) lists the following minerals in concentrates from Hopeful Gulch (in order of abundance): magnetite, epidote, apatite, scheelite, bismuthinite, wolframite, garnet, hornblende, zircon, feldspars, chlorite, augite, gold, amalgam, and calcite. Gold was discovered nearby on Bonanza Creek (NR008) in 1889 and that area was mined until at least 1918. The Ungalik River (NR008) was mined intermittently until 1987 or 1988 (Bundtzen and others, 1992). Although there is no record of mining at Hopeful Gulch, some probably took place in the early 1900s.
Age: Quaternary. The source of the gold, bismuthinite, scheelite, and wolframite in the concentrates may be the contact zone of the diorite (Cobb, 1973 [B 1374]).
Production: Although there is no record of mining at Hopeful Gulch, some probably took place in the early 1900s.
Commodities (Major) - Au, Bi, W
Development Status: Undetermined.
Deposit Model: Placer Bi-W-Au (Cox and Singer, 1986; model 39a)
6 entries listed. 4 valid minerals.
The above list contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.
Anderson, Eskil, 1944, 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. 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. Cobb, E.H., 1972, Metallic mineral resources map of the Norton Bay quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-381, 1 sheet, scale 1:250,000. Cobb, E.H., 1973, Placer deposits of Alaska: U.S. Geological Survey Bulletin 1374, 213 p. 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.