Location: Baby Creek is a small south tributary of Squaw Gulch (see EA147). Placer workings extend for the lower mile of Baby Creek. The coordinates are the approximate midpoint of the placer workings, in section 7, T. 27 N., R. 22 E., of the Copper River Meridian. The location is accurate. Baby Creek is locality 105 of Burleigh and Lear (1994).
Geology: The rocks in the vicinity of Baby Creek are Paleozoic amphibolite-facies gneiss, orthogneiss, schist, amphibolite, quartzite, and marble (Foster, 1969). Tertiary conglomerate with sparse interbedded sandstone occurs along the lower mile of Baby Creek. Gravel in Baby Creek and Squaw Gulch (see EA147) is subrounded to angular; some boulders of well-rounded quartz are as much as 1.6 feet in diameter (Yeend, 1996). Three to ten feet of gravel are generally present on top of fractured, somewhat weathered, clay-rich bedrock. Values of $4 per cubic yard of gravel were recovered during mining on Baby Creek in 1991, mostly from the lower 1.6 feet of gravel (Yeend, 1996). Small-scale mining occurred on a bench above Baby Creek in 1912 (Ellsworth and Davenport, 1913). A small open-cut operation has been active at the intersection of Squaw Gulch (see EA147) and Baby Creek from 1980 through 2000 (Bundtzen and others, 1992; Swainbank and others, 1993; Norm LaFramboise, Boundary Explorations, Inc., written commun., 2000).
Workings: Small-scale mining occurred on a bench above Baby Creek in 1912 (Ellsworth and Davenport, 1913). A small open-cut operation has been active at the intersection of Squaw Gulch (see EA147) and Baby Creek from 1980 through 2000 (Bundtzen and others, 1992; Swainbank and others, 1993; Norm LaFramboise, Boundary Explorations, Inc., written commun., 2000).
Age: Quaternary.
Production: Values of $4 per cubic yard of gravel were recovered during mining on Baby Creek in 1991, mostly from the lower 1.6 feet of gravel (Yeend, 1996).
Commodities (Major) - Au
Development Status: Yes; small
Deposit Model: Placer Au (Cox and Singer, 1986; model 39a).
References:
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. Burleigh, R.E., and Lear, K.G., 1994, Compilation of data for Phase I of the mineral resource evaluation of the Bureau of Land Management Black River and Fortymile subunits: U.S. Bureau of Mines Open-File Report 48-94, 116 p. Ellsworth, C.E., and Davenport, R.W., 1913, Placer mining in the Yukon-Tanana region: U.S. Geological Survey Bulletin 542-F, p. 203-222. Foster, H.L., 1969, Reconnaissance geology of the Eagle A-1 and A-2 quadrangles, Alaska: U.S. Geological Survey Bulletin 1271-G, p. G1-G30. Swainbank, R.C., Bundtzen, T.K., Clough, A.H., Hansen, E.W., and Nelson, M.G., 1993, Alaska's mineral industry, 1992: Alaska Division of Geological and Geophysical Surveys Special Report 47, 80 p. Yeend, W.E., 1996, Gold placers of the historical Fortymile River region, Alaska: U.S. Geological survey Bulletin 2125, 75 p., 1 sheet, 1:250,000 scale.
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Map Reference: 64°8'24"N , 141°10'19"W
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