|Quadrangle map, 1:250,000-scale||EA|
|Quadrangle map, 1:63,360-scale||D-1|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||Colorado Creek is about 6 miles west of Eagle; it is a 12-mile-long tributary of Mission Creek. Colorado Creek has also been referred to as Boulder Creek. The location of placer gold mining on Colorado Creek is uncertain; the mine coordinates are arbitrarily placed at the approximate midpoint of the creek, in section 36, T. 1 S., R. 31 E., of the Fairbanks Meridian.|
Geologic descriptionThe rocks in the vicinity of lower Colorado Creek are Paleozoic quartz-mica schist and greenschist and Tertiary to Cretaceous sedimentary rocks; the upper part of Colorado Creek is underlain by Paleozoic greenstone (Foster, 1976). Prospecting occurred on Colorado Creek in 1896, but gold was not found in paying quantities (Spurr ,1898). Mining occurred on Colorado Creek in 1902 (Brooks, 1903). Mission Creek (EA033) had placer gold production downstream of Colorado Creek.
|Geologic map unit||(-141.429019503133, 64.7807060288328)|
|Mineral deposit model||Placer Au (Cox and Singer, 1986; model 39a).|
|Mineral deposit model number||39a|
|Age of mineralization||Quaternary.|
|Workings or exploration||Prospecting occurred on Colorado Creek in 1896, but gold was not found in paying quantities (Spurr ,1898). Mining occurred on Colorado Creek in 1902 (Brooks, 1903).|
|Indication of production||Yes; small|
Brooks, A.H., 1903, Placer gold mining in Alaska in 1902: U.S. Geological Survey Bulletin 213, p. 41-48.
Cobb, E.H., 1977, Summary of references to mineral occurrences in the Eagle quadrangle, Alaska: U.S. Geological Survey Open-File Report 77-845, 122 p.
Foster, H.L., 1976, Geologic map of the Eagle quadrangle, Alaska: U.S. Geological Survey Miscellaneous Investigations Series, Map 922, 1 sheet, scale 1:250,000.
Spurr, J.E., and Goodrich, H.B., 1898, Geology of the Yukon gold district, Alaska, with an introductory chapter on the history and present condition of the district by H.B. Goodrich in Walcott, C.D., editor, Eighteenth annual report of the United States Geological Survey to the Secretary of the Interior, 1896-1897: Part III - Economic geology: U.S. Geological Survey 18th Annual Report, Part 3, p. 87-392.
|Reporters||M.B. Werdon; R.L. Flynn|
|Last report date||5/1/2002|