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Black Creek Mine, Iditarod District, Yukon-Koyukuk Borough, Alaska, USA

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Location: Black Creek has been placered for its entire length of about 1.6 miles. The coordinates are at the midpoint of the deposit about 0.5 mile north-northeast of the center of section 14, T. 27 N., R. 47 W., of the Seward Meridian. The location is accurate. Black Creek is locality 31 of Cobb (1972 [MF 363]).
Geology: Black Creek is a narrow, 1.5-mile-long stream that enters Otter Creek near Discovery camp. The creek dissects an altered monzodiorite pluton and its associated hornfels which are probably the source of much of the placer gold and heavy minerals in the Black Creek placer. The auriferous fluvial gravels varied from 10 to 12 feet thick; they were overlain by 6 to 16 feet of overburden (Mertie, 1936; Cobb, 1976 [OFR 76-576]). In addition to gold, the principal heavy minerals identified in concentrates include arsenopyrite, argentopyrite, cassiterite, cinnabar, ilmenorutile, scheelite, chromite, ilmenite, magnetite, and zircon. The gold fineness averages 819; this is significantly lower than the fineness of the gold from other gold placers in the Iditarod district (for example ID104 and ID111). Samples of concentrates collected in 1981 contained 6.51 percent tungsten, 470 parts per million (ppm) niobium, 3.35 percent chromium, 1,300 parts per billion (ppb) platinum, and 1,433 ppm lead (Bundtzen, Cox, and Veach, 1987). Open cuts were first used to mine Black Creek in 1910. From 1911 to 1915, gravel near the mouth of Black Creek was drift mined as the overburden was too thick to remove using simple excavation techniques (Mertie, 1936). From 1916 to 1918, The Union Construction Company (later North American Dredging Company) mined from the mouth of Black Creek to a point two-thirds of the way up the creek. Otter Creek Dredging Company (John Miscovich) mined from the late 1970s to 1981 near the mouth of Black Gulch and Glen Gulch with backhoe and bulldozer. There has been no mining since 1981. From 1910 to 1981, 27,925 ounces of gold was produced from Black Creek (Bundtzen and others, 1992; Miller, Bundtzen, and Gray, 2005). From 1916 to 1918, the Union Construction Company dredge alone produced 22,125 ounces of gold, or nearly 80 percent of the gold produced from Black Creek.
Workings: Open cuts were first used to mine Black Creek in 1910. From 1911 to 1915, gravel near the mouth of Black Creek, was drift mined as the overburden was too thick to remove using simple excavation techniques (Mertie, 1936). From 1916 to 1918, The Union Construction Company (later North American Dredging Company) mined from the mouth of Black Creek to a point two-thirds of the way up the creek. Otter Creek Dredging Company (John Miscovich) mined from the late 1970s to 1981 near the mouth of Black Gulch and Glen Gulch with backhoe and bulldozer. There has been no mining since 1981.
Age: Probably Quaternary.
Production: From 1910 to 1981, 27,925 ounces of gold was produced from Black Creek (Bundtzen and others, 1992; Miller, Bundtzen, and Gray, 2005). From 1916 to 1918, the Union Construction Company dredge alone produced 22,125 ounces of gold, or nearly 80 percent of the gold produced from Black Creek.

Commodities (Major) - Au; (Minor) - Ag, Cr, Hg, Nb, Sn, Pt, W
Development Status: Yes
Deposit Model: Placer Au deposit (Cox and Singer, 1986; model 39a).

Mineral List



11 entries listed. 10 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.

References

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. 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. 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., 1974, Placer deposits of Alaska: U.S. Geological Survey Bulletin 1374, 213 pages. 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. Cox, D.P., and Singer, D.A., eds., 1986, Mineral deposit models: U.S. Geological Survey Bulletin 1693, 379 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.

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