|Quadrangle map, 1:250,000-scale||DN|
|Quadrangle map, 1:63,360-scale||C-1|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||The upper reaches of Little Moose Creek (Cobb, 1980 [OFR 80-363]) have been placer mined for about 7000 feet. The placer mine extends from the Mt. McKinley C-1 into the Mt. McKinley D-1 quadrangle (Hawley and Associates, 1978). For this record, the location is at the approximate midpoint of the mined section of the creek, near the center of the NW1/4 section 34, T. 13 S., R. 15 W., Fairbanks Meridian. The lowermost two miles of Little Moose Creek (on Mt. McKinley D-1 quadrangle) were staked and prospected for many years but had limited mining (Heiner and Porter, 1972: Kardex locations 66-1, -6, and -28).|
Little Moose Creek mostly flows through Birch Creek Schist (Bundtzen, 1981). In the headwaters of Little Moose Creek, across the divide from an unnamed north fork tributary of the North Fork of Canyon Creek, a half-mile- wide band of siliceous and graphitic schist of the Keevy Peak Formation is downfaulted into the Birch Creek Schist (Hawley and Associates, 1978, fig. 4.1-A(2)). Below the outcrops of Keevy Peak Formation, ferricrete and limonitic spring deposits strongly discolor about 1500 feet of uppermost Little Moose Creek. A stream-sediment sample collected in Little Moose Creek about a mile below the limonite deposit and just above the placer mine contained 150 ppm copper, 65 ppm lead, and 1150 ppm zinc (Hawley and Associates, 1978, sample 62). A fault mapped immediately east of the placer mine places felsic schist of the Birch Creek against mainly calc-schist and quartzite-rich units. If this fault continues into the creek, it would be about at the head of the placer deposit.
The placer deposits occur in a narrow canyon with steep to moderately steep walls. The gravel section mined in about 1916 was about 8 to 10 feet thick, too deep for open-cut mining in the narrow canyon. Placer gold recovered was about 600 fine, shot-like in appearance, and accompanied by small nuggets of native silver (Capps, 1919, p. 93). Scheelite is a common mineral in the placer concentrates (Joesting, 1942).
Annual reports of the U. S. Geological Survey reported mining or active prospecting in many years between 1920 (Brooks, 1922) and 1933 (Smith, 1934). In 1922, Davis (1923) reported that miners cleaned 30,000 feet of bedrock at an average value of 22 cents per bedrock foot. Assuming that all of that value was due to gold (at $20.67 per ounce), the approximate production in 1922 was about 350 ounces of gold.The Little Moose Creek deposit is of interest geologically because of the low fineness (600) of the gold, and the occurrence of native silver in the placer.
|Geologic map unit||(, )|
|Mineral deposit model||Au-PGE placer deposit (Cox and Singer, 1986; model 39a).|
|Mineral deposit model number||39a|
|Age of mineralization||Holocene.|
|Workings or exploration||Little Moose Creek creek was explored and mined at least from 1916 until 1941. The creek was extensively mined in 1922 (Davis, 1923). Antimony miner Earl Pilgrim mined the creek in 1941 (White, 1942). In 1955, claims on lower Little Moose Creek were active, and the creek was being prospected (Heiner and Porter, 1972). Early mining may have been from shallow drifts. The creek was probably mined on a small scale with tractors in the 1930s and in 1941.|
|Indication of production||Yes; small|
|Production notes||Based on records cited by Davis (1923), about 350 ounces of gold were recovered from on Little Moose Creek in 1922. The approximate value of the production, computed at $20.67 per fine ounce of gold, was about $7,000. In general, annual production was less than this. Moffit (1933) reported that, in most years up to 1931, annual production amounted only to a few hundred dollars.|
Additional commentsThe mine is in Denali National Park and Preserve.
|MRDS Number||A011273; D002719|
Brooks, A.H., 1922, The Alaska mining industry in 1920: U.S. Geological Survey Bulletin 722-A, p. 1-74.
Bundtzen, T.K., 1981, Geology and mineral deposits of the Kantishna Hills, Mt. McKinley quadrangle, Alaska: M. S. Thesis, University of Alaska, College, Alaska, 238 p.
Cobb, E.H., 1980, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Mount McKinley quadrangle, Alaska: U. S. Geological Survey Open-File Report 80-363, 150 p.
Cox, D.P., and Singer, D.A., eds., 1986, Mineral deposit models: U.S. Geological Survey Bulletin 1693, 379 p.
Davis, J. A., 1923, The Kantishna region, Alaska, in Stewart, B. D., Annual Report of the Mine Inspector to the Governor of Alaska, 1922: Alaska Division of Geological and Geophysical Surveys AR-1922.
Hawley, C. C. and Associates, Inc, 1978, Mineral appraisal of lands adjacent to Mt. McKinley National Park, Alaska: U. S. Bureau of Mines Open-File Report 24-78, 275 p. (paged by sections).
Heiner, L.E., and Porter, Eve, 1972, Alaska Mineral Properties, volume 2: University of Alaska, Mineral Industry Research Laboratory Report 24, 669 p.
Joesting, H.R., 1942, Strategic mineral occurrences in interior Alaska: Alaska Territorial Department of Mines Pamphlet 1, 50 p.
Moffit, F.H., 1933, The Kantishna district, in Smith, P.S. and others, Mineral resources of Alaska: report on investigations in 1930, U. S. Geological Survey Bulletin 836, p. 301-338.
Smith, P.S., 1934, Mineral industry of Alaska in 1933: U.S. Geological Survey Bulletin 864-A, p. 1-94.
|Last report date||5/6/2001|