|Quadrangle map, 1:250,000-scale||CY|
|Quadrangle map, 1:63,360-scale||A-6|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||Alder Creek is a northwest-flowing tributary of Webber Creek, which drains into the Yukon River. Alder Creek is approximately 6 miles long. The exact location of placer mining on Alder Creek is unknown. The latitude and longitude coordinates correspond to an arbitrarily chosen point near the midpoint of the creek, in section 19, T. 5 N., R. 20 E., of the Fairbanks Meridian. The location is accurate to within 3 miles.|
There has been historic placer gold mining on Alder Creek, and the creek shows evidence of worked ground (Mertie, 1942).The headwaters and upper portion of Alder Creek are underlain by Cretaceous to Tertiary conglomerate and other sedimentary rocks, but the creek then crosses a high-angle normal fault, and its lower half is underlain by Paleozoic to Precambrian metamorphic rocks (Dover and Miyaoka, 1988). The gold-bearing gravels at other placer mines within the quadrangle appear to be derived from the Cretaceous to Tertiary sedimentary rocks, and this may be the case with Alder Creek. This interpretation seems especially likely since Webber Creek, which Alder Creek joins, does not contain much, if any, gold (Cobb, 1976 [OFR 76-632]).
|Geologic map unit||(-143.702404648097, 65.2496534152157)|
|Mineral deposit model||Placer Au (Cox and Singer, 1986; model 39a).|
|Mineral deposit model number||39a|
|Age of mineralization||Quaternary.|
|Workings or exploration||Alder Creek is a site of historic placer exploration with possible minor production.|
|Indication of production||Yes|
|Production notes||There has not been much, if any, placer gold produced from Alder Creek (Mertie, 1942).|
Additional commentsSee also Webber Creek (CY037). This site lies within the Yukon-Charley Rivers National Preserve.
Cobb, E.H., 1972, Metallic mineral resources map of the Charley River quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-390, 1 sheet, scale 1:250,000.
Cobb, E.H., 1976, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Charley River and Coleen quadrangles, Alaska: U.S. Geological Survey Open-File Report 76-632, 45 p.
Dover, J.A., and Miyaoka, R.T., 1988, Reinterpreted geologic map and fossil data, Charley River quadrangle, east-central Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-2004, 2 sheets, scale 1:250,000.
Mertie, J.B., Jr., 1942, Tertiary deposits of the Eagle-Circle district, Alaska: U.S. Geological Survey Bulletin 917-D, p. 213-264.
National Park Service, 1990, Final environmental impact statement, volume 1, Mining in Yukon-Charley Rivers National Preserve, Alaska: National Park Service, Anchorage, Alaska, p. 36-44.
|Reporters||C.E. Cameron (ADGGS)|
|Last report date||4/7/2000|