Malemute Gulch Mine and prospect (Pup), Iditarod District, Yukon-Koyukuk Borough, Alaska, USA
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Geology: This record includes both a lode and a placer deposit in what is locally called Malemute Gulch. The lode deposit consists of a N15-25E, steeply dipping quartz-calcite-sulfide vein that contains arsenopyrite, cinnabar, and a considerable amount of gold (Mertie, 1936; Bundtzen and others, 1992; Miller, Bundtzen, and Gray, 2005). A 70-foot drift, now caved, explored the deposit. Mertie (1936) first suggested that the Malemute Gulch lode is on the projection of the Golden Horn veins (ID115) exposed about 0.6 mile to the southwest. A formerly productive, residual placer deposit overlies the lode. The gold fineness in the placer averages 832 (Bundtzen, Cox, and Veach, 1987; Smith, 1941 [B 910]). The placer concentrates contained scheelite, chromite, ferberite, realgar, cinnabar, allanite, zircon, and cassiterite. From 1912 to 1952, the placer produced 1,907 ounces of gold and 241 ounces of silver (Miller, Bundtzen, and Gray, 2005). The placer concentrates contained up to 1.80 percent W03, 500 parts per million antimony, and 1.76 percent mercury as cinnabar (Maloney, 1962).
Workings: A 70-foot drift, now caved, explored the lode deposit. The overlying placer deposit was intermittently mined by open-cut mining methods from 1912 to 1952. It is not clear where the caved adit is in respect to the placer deposit. Mertie (1936) indicated a lode prospect '100 yds' below Malemute Gulch. Maloney (1962) stated that the caved adit was 400 feet west of the gulch. A caved adit that T.K. Bundtzen visited was within the area that was placer mined.
Age: The placer deposit is probably Quaternary. The lode deposit may be 63.0 Ma by analogy with the Golden Horn Mine (ID115).
Production: From 1912 to 1952, the placer produced 1,907 ounces of gold and 241 ounces of silver (Miller, Bundtzen, and Gray, 2005). The placer concentrates contained up to 1.80 percent W03, 500 parts per million antimony, and 1.76 percent mercury as cinnabar (Maloney, 1962).
Commodities (Major) - Au; (Minor) - As, Hg
Development Status: Yes
Deposit Model: Polymetallic vein or Porphyry Au-Cu for the lode; also a placer gold deposit (C
12 entries listed. 11 valid minerals.
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Bundtzen, T.K., and Miller, M.L., 1997, Precious metals associated with Late Cretaceous-early Tertiary igneous rocks of southwestern Alaska, in Goldfarb, R.J., and Miller, L.D., eds., Mineral Deposits of Alaska: Economic Geology Monograph 9, p. 242-286. Bundtzen, T.K., Cox, B.C., and Veach, N.C., 1987, Heavy mineral provenance studies in the Iditarod and Innoko districts, western Alaska: Process Mineralogy VII, The Metallurgical Society, p. 221-246. Bundtzen, T.K., Miller, M.L., Laird, G.M., and Bull, K.F., 1992, Geology and mineral resources of Iditarod mining district, Iditarod B-4 and eastern B-5 quadrangles, southwestern Alaska: Alaska Division of Geological and Geophysical Surveys Professional Report 97, 46 p., 2 sheets, scale 1:63,360. Cobb, E.H., 1972, Metallic mineral resources map of the Iditarod quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-363, 1 sheet, scale 1:250,000. Cobb, E.H., 1976, Summary of references to mineral occurrences (other than mineral fuels and construction material) in the Iditarod and Ophir quadrangles, Alaska: U.S. Geological Survey Open-File Report 76-576, 101 p. Maloney, R.P., 1962, Investigation of mercury-antimony deposits near Flat, Yukon River region, Alaska: U.S. Bureau of Mines Report of Investigations RI 5991, 44 p. Mertie, J.B., Jr., 1936, Mineral deposits of the Ruby-Kuskokwim region, Alaska: U.S. Geological Survey Bulletin 864-C, p. 115-245. Miller, M.L., and Bundtzen, T.K., 1994, Generalized geologic map of the Iditarod quadrangle, Alaska showing potassium-argon, major oxide, trace element, fossil, paleocurrent, and archeological sample localities: U.S. Geological Survey Miscellaneous Field Studies Map MF-2219-A, 48 pages; 1 sheet, scale 1:250,000. Miller, M.L., Bundtzen, T.K., and Gray, J.E., 2005, Mineral resource assessment of the Iditarod quadrangle, west-central Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-2219-B, scale 1:250,000, pamphlet. Smith, P.S., 1941, Fineness of gold from Alaska placers: U.S. Geological Survey Bulletin 910-C, p. 147-269.