|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||Robert Creek is one of the principal tributaries to the Bettles River, and Sheep Creek is a major south-flowing tributary to Robert Creek. The creeks are many miles long. There is reference to early prospecting on Robert Creek, Sheep Creek, and their tributaries but no indication where. This site is arbitrarily plotted at the junction of Robert Creek and Sheep Creek near the southwest corner of section 32, T. 33 N., R. 7 W.|
Maddren (1913) reported that placer gold prospects had been found on Sheep Creek and 'especially those tributary to Robert Creek', as well as on a number of other creeks in the headwaters of the Bettles River. Maddren also noted that the gold was found on the lower parts of the tributaries to Roberts Creek. Maddren (1913) did not visit this area; his reports are based on Schrader (1900) and information from local prospectors. The only other placer gold occurrence in tributaries to Robert Creek is Willow Creek (CH109). (Reed (1938) pointed out that Maddren (1913) incorrectly identified Sheep Creek as Spruce Creek and Willow Creek as Sheep Creek.)Kurtak and others (2002) sampled and panned along several miles of Sheep Creek. They found no indication of past or recent mining and there was no visible gold in their pans. However, analyses of some of their panned concentrates found a small amount of gold.
|Geologic map unit||(-149.191854117652, 67.6354995572739)|
|Mineral deposit model||Placer Au (Cox and Singer, 1986; model 39a).|
|Mineral deposit model number||39a|
|Age of mineralization||Quaternary.|
|Workings or exploration||Maddren (1913) reported that gold prospects had been found on Sheep Creek and 'especially those tributary to Robert Creek', as well as in a number of other creeks in the headwaters of the Bettles River. Maddren also noted that the gold was found on the lower parts of the tributaries to Roberts Creek. Kurtak and others (2002) sampled and panned along several miles of Sheep Creek. They found no indication of recent mining and there was no visible gold in their pans.|
|Indication of production||None|
|Production notes||Possibly a small amount of gold was produced during prospecting before 1913.|
This prospect is on Doyon Ltd. selected lands; for more information, contact Doyon Ltd., Fairbanks, Alaska.MAS No. 0020310045
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.
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|