Tamarack Creek Mine, Innoko District, Yukon-Koyukuk Borough, Alaska, USA
Location: Tamarack Creek is a short, northwest-flowing tributary of Spruce Creek; Spruce Creek is about 3.5 miles south of Ophir. The coordinates are at the placer mine marked near the mouth of Tamarack Creek on the U.S. Geological Survey Ophir A-2 topographic map (1954, minor revisions 1965), in NW1/4 sec. 2, T. 28 S., R. 12 E., Kateel River Meridian. Tamarack Creek is locality 18 of Cobb (1972 [MF 367]). The location is accurate within 100 feet.
Geology: The rocks in the vicinity of Tamarack creek are shale and siltstone. The creek probably also drains Cretaceous or Tertiary monzonite plutons, and dikes of various compositions (Chapman and others, 1985). These intrusive rocks probably are the source of the placer gold in Tamarack Creek (Bundtzen and others, 1987). Heavy minerals in pan concentrates from Tamarack Creek include magnetite, ilmenite, pyrite, pyroxene, amphibole, and several grains of native silver (Bundtzen and others, 1987). Mertie (1936) reports that a paystreak yielding good returns was being mined in 1934. Production from Tamarack Creek probably is combined with production figures for Spruce Creek (OP026).
Workings: Mertie (1936) reports that a paystreak yielding good returns was being mined in 1934.
Production: Production from Tamarack Creek probably is combined with production for Spruce Creek (OP026).
Commodities (Major) - Au; (Minor) - Ag
Development Status: Yes; small
Deposit Model: Placer Au (Cox and Singer, 1986; model 39a)
ReferencesBundtzen, T.K., Cox, B.C., and Veach, N.C., 1987, Heavy mineral provenance studies in the Iditarod and Innoko districts, western Alaska: Alaska Division of Geological and Geophysical Surveys Public-Data File 87-16, 25 p. Chapman, R.M., Patton, W.W., and Moll, E.J., 1985, Reconnaissance geologic map of the Ophir quadrangle, Alaska: U.S. Geological Survey Open-File Report 85-203, 19 p., 1 sheet, scale 1:250,000. Cobb, E.H., 1972, Metallic mineral resources map of the Ophir quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-367, 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. Mertie, J.B., Jr., 1936, Mineral deposits of the Ruby-Kuskokwim region, Alaska: U.S. Geological Survey Bulletin 864-C, p. 115-245.
5 entries listed. 5 valid minerals.
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