|Quadrangle map, 1:250,000-scale||CH|
|Quadrangle map, 1:63,360-scale||C-5|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||The lower half mile of Garnet Creek has been mined and the site is plotted at about the middle of this area. Garnet Creek is a tributary to the Bettles River; the mouth of the creek is about 2.8 miles north-northeast of the north end of Bob Johnson Lake (formerly Big Lake). The part of the creek that was mined flows through the northeast quarter of section 31, T. 32 N., R. 8 W.|
Geologic descriptionMost of the mining on Garnet Creek extended for about a half mile upstream from its mouth (Kurtak and others, 2002). Maddren (1913) reported the ground was producing about $7 to $9 dollars a man per day (at $20.67 per ounce of gold). Forty-eight ounces of gold was produced from 1900 to 1909. Claims were staked after World War I but the next significant mining was from 1937 to 1940 when 70 ounces of gold was produced. Reed (1938) reported that the mining was along the modern channel of the creek; the gold was on bedrock and the lower few feet of the overlying gravel. The gravel is coarse and waterworn, with many large boulders. It was about 8 feet thick near the mouth of the creek and thins to 1 to 3 feet thick a half mile upstream. The ground that was mined in 1937 was said to run about 0.022 ounce of gold per square foot of bedrock. The gold was fairly fine, with a few nuggets. Reed (1938) reported a high channel, but it had not been prospected to any extent at that time. In 1950, ground sluicing gave poor returns. Claims were staked in 1959 (Heiner and Wolff, 1968) and from 1980 to 1986 (Kurtak and others, 2002).
|Geologic map unit||(-149.406150636599, 67.5597938071123)|
|Mineral deposit model||Placer Au (Cox and Singer, 1986; model 39a).|
|Mineral deposit model number||39a|
|Age of mineralization||Quaternary.|
|Workings or exploration||Surface mining reported in 1937. Claims were staked in 1959 and from 1980 to 1986.|
|Indication of production||Yes|
|Production notes||Production from 1900 to 1909 was reported to yield $7 to $9 per man-day and totaled $1,000, or about 48 ounces (Maddren, 1913).|
This prospect is on Doyon Ltd. selected lands; for more information, contact Doyon Ltd., Fairbanks, Alaska.MAS No. 0020310042
Cobb, E.H., 1976, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Chandalar and Wiseman quadrangles, Alaska: U.S. Geological Survey Open-File Report 76-340, 205 p.
Cobb, E.H., and Cruz, E.L., 1983, Summaries of data and lists of references to metallic and selected nonmetallic mineral deposits in the Chandalar quadrangle, Alaska: U.S. Geological Survey Open-File Report 83-278, 91 p.
Dillon, J.T., 1987, Upper Koyukuk district land and mining claim status current to 1985: Alaska Division of Geological and Geophysical Surveys, Public Data File 87-11, 25 pages, 1 map, scale 1:125,000.
Dillon, J.T., Reifenstuhl, R.R., and, Harris, G.W., 1996, Geologic map of the Chandalar C-5 quadrangle, southeastern Brooks Range, Alaska: Alaska Division of Geological and Geophysical Surveys Professional Report 104, 2 sheets, scale 1:63,360.
Heiner, L.E., and Wolff, E.N., eds., 1968, Mineral resources of northern Alaska, Final report, submitted to the NORTH Commission: University of Alaska, Mineral Industry Research Laboratory Report No. 16, 306 p.
Kurtak, J.M., Klieforth, R.F., Clark, J.M., and Maclean, E.A., 2002, Mineral investigations in the Koyukuk mining district, northern Alaska, 2 vols.: Bureau of Land Management, Alaska Technical Report 50, 845 p.
Maddren, A.G., 1910, The Koyukuk-Chandalar gold region: U.S. Geological Survey Bulletin 442-G, p. 284-315.
Maddren, A.G., 1913, The Koyukuk-Chandalar region, Alaska: U.S. Geological Survey Bulletin 532, 119 p.
Reed, I.M., 1938, Upper Koyukuk region, Alaska: Alaska Territorial Department of Mines Miscellaneous Report 194-7, 169 p.
|Reporters||J.M. Britton (Anchorage, Alaska); D.J. Grybeck (Contractor, U.S. Geological Survey)|
|Last report date||4/18/2010|