|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||Excelsior Creek is about 8 miles west-northwest of Eagle; it is a tributary of Mission Creek. Excelsior Creek was formerly known as Twelvemile Creek. The location of placer gold minng on Excelsior Creek is uncertain; the coordinates are arbitrarily placed about 1.5 miles upstream of the mouth of the creek, in section 13, T. 1 S., R. 31 E., of the Fairbanks Meridian. The location is accurate within 1.5 miles. Excelsior Creek is locality 24 of Eberlein and others (1977) and locality 32 of Cobb (1972 [MF-393]).|
The rocks in the vicinity of upper Excelsior Creek are Paleozoic quartz-mica schist, greenschist, local marble, and greenstone; the rocks on lower Excelsior Creek are Upper Cretaceous to Pliocene terrigenous sedimentary rocks. These rocks have been intruded by Tertiary to Mesozoic granitic rocks (Foster, 1976). A strand of the Tintina Fault runs along the lower 3 miles of Excelsior Creek, and Quaternary terrace and alluvial deposits are present near the mouth.Excelsior Creek was prospected for placer gold in 1896 (Spurr, 1898). Cretaceous to Tertiary sedimentary rocks in the area were interpreted to be the source of the placer gold (Mertie, 1969). Trace monazite was noted in a plutonic rock adjacent to the creek (Wedow, 1954).
|Geologic map unit||(-141.441722479988, 64.8304077339071)|
|Mineral deposit model||Placer Au (Cox and Singer, 1986; model 39a).|
|Mineral deposit model number||39a|
|Age of mineralization||Quaternary.|
|Workings or exploration||Excelsior Creek was prospected for placer gold in 1896 (Spurr, 1898). Cretaceous to Tertiary sedimentary rocks in the area were interpreted by Mertie (1969) to be the source of the placer gold. Trace monazite was noted in a plutonic rock adjacent to the creek (Wedow, 1954).|
|Indication of production||None|
Cobb, E.H., 1972, Metallic mineral resources map of the Eagle quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-393, 1:250,000 scale, 1 sheet.
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.
Eberlein, G.D., Chapman, R.M., Foster, H.L., and Gassaway, J.S., 1977, Map and table describing known metalliferous and selected nonmetalliferous mineral deposits in central Alaska: U.S. Geological Survey Open-File Report 77-168-D, 132 p., 1 sheet, scale 1:1,000,000.
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.
Mertie, J.B., Jr., 1969, Economic geology of platinum minerals: U.S. Geological Survey Professional Paper 630, 120 p.
Overstreet, W.C., 1967, The geologic occurrence of monazite: U.S. Geological Survey Professional Paper 530, 327 p.
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|